update software fft

software/signal_processing/fft.c

     // FFT berechnen
     cooley_tukey(input, DATA_CHANNEL_DEPTH);
 
-    // Ergebnisse normalisieren
-    for (uint32_t i = 0; i < DATA_CHANNEL_DEPTH; ++i) {
-        input[i].re /= DATA_CHANNEL_DEPTH/2;
-        input[i].im /= DATA_CHANNEL_DEPTH/2;
-    }
-	input[0].re = input[0].re + 0.1403;
-
     // Ergebnisse in data channel schreiben
     for (uint32_t i = 0; i < DATA_CHANNEL_DEPTH; ++i) {
+
 	float_word c;
 	c.value = complex_abs(&input[i]);
+
+
+	if (i > (uint32_t)0)
+	{	
+		c.value = c.value * (2.0/DATA_CHANNEL_DEPTH);
+	}
+	else
+	{
+		c.value = c.value * (1.0/DATA_CHANNEL_DEPTH);
+	}
+
+
 	data_channel_write(config->base.sink, c.word);
     }
 

software/signal_processing_bsp/HAL/inc/alt_types.h

+#ifndef __ALT_TYPES_H__
+#define __ALT_TYPES_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2003 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/* 
+ * Don't declare these typedefs if this file is included by assembly source.
+ */
+#ifndef ALT_ASM_SRC
+typedef signed char  alt_8;
+typedef unsigned char  alt_u8;
+typedef signed short alt_16;
+typedef unsigned short alt_u16;
+typedef signed long alt_32;
+typedef unsigned long alt_u32;
+typedef long long alt_64;
+typedef unsigned long long alt_u64;
+#endif
+
+#define ALT_INLINE        __inline__
+#define ALT_ALWAYS_INLINE __attribute__ ((always_inline))
+#define ALT_WEAK          __attribute__((weak))
+
+#endif /* __ALT_TYPES_H__ */

software/signal_processing_bsp/HAL/inc/altera_nios2_gen2_irq.h

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2009 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+
+/*
+ * Support for the Nios II internal interrupt controller.
+ */
+
+#ifndef __ALT_NIOS2_GEN2_IRQ_H__
+#define __ALT_NIOS2_GEN2_IRQ_H__
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+/*
+ * The macro ALTERA_NIOS2_GEN2_IRQ_INSTANCE is used by the alt_irq_init()
+ * function in the auto-generated file alt_sys_init.c to create an
+ * instance of this interrupt controller device driver state if this
+ * module contains an interrupt controller.
+ * Only one instance of a Nios II is allowed so this macro is just empty.
+ */
+
+#define ALTERA_NIOS2_GEN2_IRQ_INSTANCE(name, state)
+
+/*
+ * altera_nios2_gen2_irq_init() is called by the auto-generated function 
+ * alt_irq_init() once for the Nios II if it contains an interrupt controller.
+ * The altera_nios2_gen2_irq_init() routine is called using the 
+ * ALTERA_NIOS2_GEN2_IRQ_INIT macro given below.
+ *
+ * This function initializes the internal interrupt controller
+ * so is not called if the Nios II contains an external interrupt
+ * controller port (because the internal interrupt controller
+ * is removed if this port is present).
+ */
+
+extern void altera_nios2_gen2_irq_init( void );
+
+/*
+ * The macro ALTERA_NIOS2_GEN2_IRQ_INIT is used by the alt_irq_init() routine
+ * in the auto-generated file alt_sys_init.c to initialize an instance
+ * of the interrupt controller device driver state.
+ */
+
+#define ALTERA_NIOS2_GEN2_IRQ_INIT(name, state) altera_nios2_gen2_irq_init()
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ALT_NIOS2_ULTRA_IRQ_H__ */
+

software/signal_processing_bsp/HAL/inc/io.h

+#ifndef __IO_H__
+#define __IO_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2003 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/* IO Header file for Nios II Toolchain */
+
+#include "alt_types.h"
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+#ifndef SYSTEM_BUS_WIDTH
+#define SYSTEM_BUS_WIDTH 32
+#endif
+
+/* Dynamic bus access functions */
+
+#define __IO_CALC_ADDRESS_DYNAMIC(BASE, OFFSET) \
+  ((void *)(((alt_u8*)BASE) + (OFFSET)))
+
+#define IORD_32DIRECT(BASE, OFFSET) \
+  __builtin_ldwio (__IO_CALC_ADDRESS_DYNAMIC ((BASE), (OFFSET)))
+#define IORD_16DIRECT(BASE, OFFSET) \
+  __builtin_ldhuio (__IO_CALC_ADDRESS_DYNAMIC ((BASE), (OFFSET)))
+#define IORD_8DIRECT(BASE, OFFSET) \
+  __builtin_ldbuio (__IO_CALC_ADDRESS_DYNAMIC ((BASE), (OFFSET)))
+
+#define IOWR_32DIRECT(BASE, OFFSET, DATA) \
+  __builtin_stwio (__IO_CALC_ADDRESS_DYNAMIC ((BASE), (OFFSET)), (DATA))
+#define IOWR_16DIRECT(BASE, OFFSET, DATA) \
+  __builtin_sthio (__IO_CALC_ADDRESS_DYNAMIC ((BASE), (OFFSET)), (DATA))
+#define IOWR_8DIRECT(BASE, OFFSET, DATA) \
+  __builtin_stbio (__IO_CALC_ADDRESS_DYNAMIC ((BASE), (OFFSET)), (DATA))
+
+/* Native bus access functions */
+
+#define __IO_CALC_ADDRESS_NATIVE(BASE, REGNUM) \
+  ((void *)(((alt_u8*)BASE) + ((REGNUM) * (SYSTEM_BUS_WIDTH/8))))
+
+#define IORD(BASE, REGNUM) \
+  __builtin_ldwio (__IO_CALC_ADDRESS_NATIVE ((BASE), (REGNUM)))
+#define IOWR(BASE, REGNUM, DATA) \
+  __builtin_stwio (__IO_CALC_ADDRESS_NATIVE ((BASE), (REGNUM)), (DATA))
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __IO_H__ */

software/signal_processing_bsp/HAL/inc/nios2.h

+#ifndef __NIOS2_H__
+#define __NIOS2_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2008 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+
+/*
+ * This header provides processor specific macros for accessing the Nios2
+ * control registers.
+ */
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+/*
+ * Number of available IRQs in internal interrupt controller.
+ */
+#define NIOS2_NIRQ 32
+
+/*
+ * Macros for accessing select Nios II general-purpose registers.
+ */
+
+/* ET (Exception Temporary) register */ 
+#define NIOS2_READ_ET(et) \
+    do { __asm ("mov %0, et" : "=r" (et) ); } while (0)
+
+#define NIOS2_WRITE_ET(et) \
+    do { __asm volatile ("mov et, %z0" : : "rM" (et)); } while (0)
+
+/* SP (Stack Pointer) register */ 
+#define NIOS2_READ_SP(sp) \
+    do { __asm ("mov %0, sp" : "=r" (sp) ); } while (0)
+
+/*
+ * Macros for useful processor instructions.
+ */
+#define NIOS2_BREAK() \
+    do { __asm volatile ("break"); } while (0)
+
+#define NIOS2_REPORT_STACK_OVERFLOW() \
+    do { __asm volatile("break 3"); } while (0)
+
+/*
+ * Macros for accessing Nios II control registers.
+ */
+#define NIOS2_READ_STATUS(dest) \
+    do { dest = __builtin_rdctl(0); } while (0)
+
+#define NIOS2_WRITE_STATUS(src) \
+    do { __builtin_wrctl(0, src); } while (0)
+
+#define NIOS2_READ_ESTATUS(dest) \
+    do { dest = __builtin_rdctl(1); } while (0)
+
+#define NIOS2_READ_BSTATUS(dest) \
+    do { dest = __builtin_rdctl(2); } while (0)
+
+#define NIOS2_READ_IENABLE(dest) \
+    do { dest = __builtin_rdctl(3); } while (0)
+
+#define NIOS2_WRITE_IENABLE(src) \
+    do { __builtin_wrctl(3, src); } while (0)
+
+#define NIOS2_READ_IPENDING(dest) \
+    do { dest = __builtin_rdctl(4); } while (0)
+
+#define NIOS2_READ_CPUID(dest) \
+    do { dest = __builtin_rdctl(5); } while (0)
+
+#define NIOS2_READ_EXCEPTION(dest) \
+    do { dest = __builtin_rdctl(7); } while (0)
+
+#define NIOS2_READ_PTEADDR(dest) \
+    do { dest = __builtin_rdctl(8); } while (0)
+
+#define NIOS2_WRITE_PTEADDR(src) \
+    do { __builtin_wrctl(8, src); } while (0)
+
+#define NIOS2_READ_TLBACC(dest) \
+    do { dest = __builtin_rdctl(9); } while (0)
+
+#define NIOS2_WRITE_TLBACC(src) \
+    do { __builtin_wrctl(9, src); } while (0)
+
+#define NIOS2_READ_TLBMISC(dest) \
+    do { dest = __builtin_rdctl(10); } while (0)
+
+#define NIOS2_WRITE_TLBMISC(src) \
+    do { __builtin_wrctl(10, src); } while (0)
+
+#define NIOS2_READ_ECCINJ(dest) \
+    do { dest = __builtin_rdctl(11); } while (0)
+
+#define NIOS2_WRITE_ECCINJ(src) \
+    do { __builtin_wrctl(11, src); } while (0)
+
+#define NIOS2_READ_BADADDR(dest) \
+    do { dest = __builtin_rdctl(12); } while (0)
+
+#define NIOS2_WRITE_CONFIG(src) \
+    do { __builtin_wrctl(13, src); } while (0)
+
+#define NIOS2_READ_CONFIG(dest) \
+    do { dest = __builtin_rdctl(13); } while (0)
+
+#define NIOS2_WRITE_MPUBASE(src) \
+    do { __builtin_wrctl(14, src); } while (0)
+
+#define NIOS2_READ_MPUBASE(dest) \
+    do { dest = __builtin_rdctl(14); } while (0)
+
+#define NIOS2_WRITE_MPUACC(src) \
+    do { __builtin_wrctl(15, src); } while (0)
+
+#define NIOS2_READ_MPUACC(dest) \
+    do { dest = __builtin_rdctl(15); } while (0)
+
+/*
+ * Nios II control registers that are always present
+ */
+#define NIOS2_STATUS   status
+#define NIOS2_ESTATUS  estatus
+#define NIOS2_BSTATUS  bstatus
+#define NIOS2_IENABLE  ienable
+#define NIOS2_IPENDING ipending
+#define NIOS2_CPUID cpuid
+
+/*
+ * Bit masks & offsets for Nios II control registers.
+ * The presence and size of a field is sometimes dependent on the Nios II
+ * configuration.  Bit masks for every possible field and the maximum size of
+ * that field are defined.
+ *
+ * All bit-masks are expressed relative to the position
+ * of the data with a register. To read data that is LSB-
+ * aligned, the register read data should be masked, then
+ * right-shifted by the designated "OFST" macro value. The
+ * opposite should be used for register writes when starting
+ * with LSB-aligned data.
+ */
+
+/* STATUS, ESTATUS, BSTATUS, and SSTATUS registers */
+#define NIOS2_STATUS_PIE_MSK  (0x00000001)
+#define NIOS2_STATUS_PIE_OFST (0)
+#define NIOS2_STATUS_U_MSK    (0x00000002)
+#define NIOS2_STATUS_U_OFST   (1)
+#define NIOS2_STATUS_EH_MSK   (0x00000004)
+#define NIOS2_STATUS_EH_OFST  (2)
+#define NIOS2_STATUS_IH_MSK     (0x00000008)
+#define NIOS2_STATUS_IH_OFST    (3)
+#define NIOS2_STATUS_IL_MSK     (0x000003f0)
+#define NIOS2_STATUS_IL_OFST    (4)
+#define NIOS2_STATUS_CRS_MSK    (0x0000fc00)
+#define NIOS2_STATUS_CRS_OFST   (10)
+#define NIOS2_STATUS_PRS_MSK    (0x003f0000)
+#define NIOS2_STATUS_PRS_OFST   (16)
+#define NIOS2_STATUS_NMI_MSK    (0x00400000)
+#define NIOS2_STATUS_NMI_OFST   (22)
+#define NIOS2_STATUS_RSIE_MSK   (0x00800000)
+#define NIOS2_STATUS_RSIE_OFST  (23)
+#define NIOS2_STATUS_SRS_MSK    (0x80000000)
+#define NIOS2_STATUS_SRS_OFST   (31)
+
+/* EXCEPTION register */
+#define NIOS2_EXCEPTION_REG_CAUSE_MASK (0x0000007c)
+#define NIOS2_EXCEPTION_REG_CAUSE_OFST (2)
+#define NIOS2_EXCEPTION_REG_ECCFTL_MASK (0x80000000)
+#define NIOS2_EXCEPTION_REG_ECCFTL_OFST (31)
+
+/* PTEADDR (Page Table Entry Address) register */
+#define NIOS2_PTEADDR_REG_VPN_OFST 2
+#define NIOS2_PTEADDR_REG_VPN_MASK 0x3ffffc
+#define NIOS2_PTEADDR_REG_PTBASE_OFST 22
+#define NIOS2_PTEADDR_REG_PTBASE_MASK 0xffc00000
+
+/* TLBACC (TLB Access) register */
+#define NIOS2_TLBACC_REG_PFN_OFST 0
+#define NIOS2_TLBACC_REG_PFN_MASK 0xfffff
+#define NIOS2_TLBACC_REG_G_OFST 20
+#define NIOS2_TLBACC_REG_G_MASK 0x100000
+#define NIOS2_TLBACC_REG_X_OFST 21
+#define NIOS2_TLBACC_REG_X_MASK 0x200000
+#define NIOS2_TLBACC_REG_W_OFST 22
+#define NIOS2_TLBACC_REG_W_MASK 0x400000
+#define NIOS2_TLBACC_REG_R_OFST 23
+#define NIOS2_TLBACC_REG_R_MASK 0x800000
+#define NIOS2_TLBACC_REG_C_OFST 24
+#define NIOS2_TLBACC_REG_C_MASK 0x1000000
+#define NIOS2_TLBACC_REG_IG_OFST 25
+#define NIOS2_TLBACC_REG_IG_MASK 0xfe000000
+
+/* TLBMISC (TLB Miscellaneous) register */
+#define NIOS2_TLBMISC_REG_D_OFST 0
+#define NIOS2_TLBMISC_REG_D_MASK 0x1
+#define NIOS2_TLBMISC_REG_PERM_OFST 1
+#define NIOS2_TLBMISC_REG_PERM_MASK 0x2
+#define NIOS2_TLBMISC_REG_BAD_OFST 2
+#define NIOS2_TLBMISC_REG_BAD_MASK 0x4
+#define NIOS2_TLBMISC_REG_DBL_OFST 3
+#define NIOS2_TLBMISC_REG_DBL_MASK 0x8
+#define NIOS2_TLBMISC_REG_PID_OFST 4
+#define NIOS2_TLBMISC_REG_PID_MASK 0x3fff0
+#define NIOS2_TLBMISC_REG_WE_OFST 18
+#define NIOS2_TLBMISC_REG_WE_MASK 0x40000
+#define NIOS2_TLBMISC_REG_RD_OFST 19
+#define NIOS2_TLBMISC_REG_RD_MASK 0x80000
+#define NIOS2_TLBMISC_REG_WAY_OFST 20
+#define NIOS2_TLBMISC_REG_WAY_MASK 0xf00000
+#define NIOS2_TLBMISC_REG_EE_OFST 24
+#define NIOS2_TLBMISC_REG_EE_MASK 0x1000000
+
+/* ECCINJ (ECC Inject) register */
+#define NIOS2_ECCINJ_REG_RF_OFST 0
+#define NIOS2_ECCINJ_REG_RF_MASK 0x3
+#define NIOS2_ECCINJ_REG_ICTAG_OFST 2
+#define NIOS2_ECCINJ_REG_ICTAG_MASK 0xc
+#define NIOS2_ECCINJ_REG_ICDAT_OFST 4
+#define NIOS2_ECCINJ_REG_ICDAT_MASK 0x30
+#define NIOS2_ECCINJ_REG_DCTAG_OFST 6
+#define NIOS2_ECCINJ_REG_DCTAG_MASK 0xc0
+#define NIOS2_ECCINJ_REG_DCDAT_OFST 8
+#define NIOS2_ECCINJ_REG_DCDAT_MASK 0x300
+#define NIOS2_ECCINJ_REG_TLB_OFST 10
+#define NIOS2_ECCINJ_REG_TLB_MASK 0xc00
+#define NIOS2_ECCINJ_REG_DTCM0_OFST 12
+#define NIOS2_ECCINJ_REG_DTCM0_MASK 0x3000
+#define NIOS2_ECCINJ_REG_DTCM1_OFST 14
+#define NIOS2_ECCINJ_REG_DTCM1_MASK 0xc000
+#define NIOS2_ECCINJ_REG_DTCM2_OFST 16
+#define NIOS2_ECCINJ_REG_DTCM2_MASK 0x30000
+#define NIOS2_ECCINJ_REG_DTCM3_OFST 18
+#define NIOS2_ECCINJ_REG_DTCM3_MASK 0xc0000
+
+/* CONFIG register */
+#define NIOS2_CONFIG_REG_PE_MASK (0x00000001)
+#define NIOS2_CONFIG_REG_PE_OFST (0)
+#define NIOS2_CONFIG_REG_ANI_MASK (0x00000002)
+#define NIOS2_CONFIG_REG_ANI_OFST (1)
+#define NIOS2_CONFIG_REG_ECCEN_MASK (0x00000004)
+#define NIOS2_CONFIG_REG_ECCEN_OFST (2)
+#define NIOS2_CONFIG_REG_ECCEXC_MASK (0x00000008)
+#define NIOS2_CONFIG_REG_ECCEXC_OFST (3)
+
+/* MPUBASE (MPU Base Address) Register */
+#define NIOS2_MPUBASE_D_MASK         (0x00000001)
+#define NIOS2_MPUBASE_D_OFST         (0)
+#define NIOS2_MPUBASE_INDEX_MASK     (0x0000003e)
+#define NIOS2_MPUBASE_INDEX_OFST     (1)
+#define NIOS2_MPUBASE_BASE_ADDR_MASK (0xffffffc0)
+#define NIOS2_MPUBASE_BASE_ADDR_OFST (6)
+
+/* MPUACC (MPU Access) Register */
+#define NIOS2_MPUACC_LIMIT_MASK (0xffffffc0)
+#define NIOS2_MPUACC_LIMIT_OFST (6)
+#define NIOS2_MPUACC_MASK_MASK  (0xffffffc0)
+#define NIOS2_MPUACC_MASK_OFST  (6)
+#define NIOS2_MPUACC_C_MASK     (0x00000020)
+#define NIOS2_MPUACC_C_OFST     (5)
+#define NIOS2_MPUACC_PERM_MASK  (0x0000001c)
+#define NIOS2_MPUACC_PERM_OFST  (2)
+#define NIOS2_MPUACC_RD_MASK    (0x00000002)
+#define NIOS2_MPUACC_RD_OFST    (1)
+#define NIOS2_MPUACC_WR_MASK    (0x00000001)
+#define NIOS2_MPUACC_WR_OFST    (0)
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __NIOS2_H__ */

software/signal_processing_bsp/HAL/inc/os/alt_flag.h

+#ifndef __ALT_FLAG_H__
+#define __ALT_FLAG_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
+*                                                                             *
+******************************************************************************/
+
+/*
+ * This header provides macro definitions that can be used to create and use
+ * uc/OS-II style event flags. These macros can be used in both a uC/OS-II based 
+ * environment, and a single threaded HAL based environment.
+ *
+ * The motivation for these macros is to allow code to be developed which is
+ * thread safe under uC/OS-II, but incurs no additional overhead when used in a
+ * single threaded HAL environment.  
+ *
+ * In the case of a single threaded HAL environment, they compile to 
+ * "do nothing" directives, which ensures they do not contribute to the final
+ * executable.
+ *
+ * The following macros are available:
+ *
+ * ALT_FLAG_GRP        - Create a flag group instance.
+ * ALT_EXTERN_FLAG_GRP - Create a reference to an external flag group instance.
+ * ALT_STATIC_FLAG_GRP - Create a static flag group instance.
+ * ALT_FLAG_CREATE     - Initialise a flag group.
+ * ALT_FLAG_PEND       - Pend on a flag group.
+ * ALT_FLAG_POST       - Set a flag condition.
+ 
+ *
+ * Input arguments and return codes are all consistant with the equivalent
+ * uC/OS-II function.
+ *
+ * It's important to be careful in the use of the macros: ALT_FLAG_GRP, 
+ * ALT_EXTERN_FLAG_GRP, and ALT_STATIC_FLAG_GRP. In these three cases the 
+ * semi-colon is included in the macro definition; so, for example, you should 
+ * use:
+ *
+ * ALT_FLAG_GRP(mygroup)
+ *
+ * not:
+ *
+ * ALT_FLAG_GRP(mygroup);
+ *
+ * The inclusion of the semi-colon has been necessary to ensure the macros can
+ * compile with no warnings when used in a single threaded HAL environment.
+ *
+ */ 
+
+#include "priv/alt_no_error.h"
+
+#define ALT_FLAG_GRP(group)
+#define ALT_EXTERN_FLAG_GRP(group) 
+#define ALT_STATIC_FLAG_GRP(group)
+       
+#define ALT_FLAG_CREATE(group, flags) alt_no_error ()   
+#define ALT_FLAG_PEND(group, flags, wait_type, timeout) alt_no_error ()
+#define ALT_FLAG_POST(group, flags, opt) alt_no_error ()
+
+#ifndef ALT_SINGLE_THREADED
+#define ALT_SINGLE_THREADED
+#endif
+
+#endif /* __ALT_FLAG_H__ */

software/signal_processing_bsp/HAL/inc/os/alt_hooks.h

+#ifndef __ALT_HOOKS_H__
+#define __ALT_HOOKS_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
+*                                                                             *
+******************************************************************************/
+
+/*
+ * This header provides "do-nothing" macro definitions for operating system 
+ * hooks within the HAL. The O/S component can override these to provide it's 
+ * own implementation.
+ */ 
+
+#define ALT_OS_TIME_TICK() while(0)
+#define ALT_OS_INIT()      while(0)
+#define ALT_OS_STOP()      while(0)
+
+/* Call from assembly code */
+#define ALT_OS_INT_ENTER_ASM
+#define ALT_OS_INT_EXIT_ASM
+
+/* Call from C code */
+#define ALT_OS_INT_ENTER() while(0)
+#define ALT_OS_INT_EXIT()  while(0)
+
+
+#endif /* __ALT_HOOKS_H__ */

software/signal_processing_bsp/HAL/inc/os/alt_sem.h

+#ifndef __ALT_SEM_H__
+#define __ALT_SEM_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
+*                                                                             *
+******************************************************************************/
+
+/*
+ * This header provides macro definitions that can be used to create and use
+ * semaphores. These macros can be used in both a uC/OS-II based environment,
+ * and a single threaded HAL based environment.
+ *
+ * The motivation for these macros is to allow code to be developed which is
+ * thread safe under uC/OS-II, but incurs no additional overhead when used in a
+ * single threaded HAL environment.  
+ *
+ * In the case of a single threaded HAL environment, they compile to 
+ * "do nothing" directives, which ensures they do not contribute to the final
+ * executable.
+ *
+ * The following macros are available:
+ *
+ * ALT_SEM        - Create a semaphore instance.
+ * ALT_EXTERN_SEM - Create a reference to an external semaphore instance.
+ * ALT_STATIC_SEM - Create a static semaphore instance.
+ * ALT_SEM_CREATE - Initialise a semaphore.
+ * ALT_SEM_PEND   - Pend on a semaphore.
+ * ALT_SEM_POST   - Increment a semaphore.
+ *
+ * Input arguments and return codes are all consistant with the equivalent
+ * uC/OS-II function.
+ *
+ * It's important to be careful in the use of the macros: ALT_SEM, 
+ * ALT_EXTERN_SEM, and ALT_STATIC_SEM. In these three cases the semi-colon is
+ * included in the macro definition; so, for example, you should use:
+ *
+ * ALT_SEM(mysem)
+ *
+ * not:
+ *
+ * ALT_SEM(mysem);
+ *
+ * The inclusion of the semi-colon has been necessary to ensure the macros can
+ * compile with no warnings when used in a single threaded HAL environment.
+ *
+ */ 
+
+#include "priv/alt_no_error.h"
+
+#define ALT_SEM(sem)
+#define ALT_EXTERN_SEM(sem)
+#define ALT_STATIC_SEM(sem)
+              
+#define ALT_SEM_CREATE(sem, value) alt_no_error () 
+#define ALT_SEM_PEND(sem, timeout) alt_no_error ()
+#define ALT_SEM_POST(sem) alt_no_error ()
+
+#ifndef ALT_SINGLE_THREADED
+#define ALT_SINGLE_THREADED
+#endif
+
+#endif /* __ALT_SEM_H__ */

software/signal_processing_bsp/HAL/inc/os/alt_syscall.h

+#ifndef __ALT_SYSCALL_H__
+#define __ALT_SYSCALL_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2003 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+
+/*
+ * The macros defined in this file are used to provide the function names used
+ * for the HAL 'UNIX style' interface, e.g. read(), write() etc. 
+ *
+ * Operating systems which are ported to the HAL can provide their own 
+ * version of this file, which will be used in preference. This allows
+ * the operating system to provide it's own implementation of the top level
+ * system calls, while retaining the HAL functions under a different name, 
+ * for example, alt_read(), alt_write() etc.
+ */
+
+#define ALT_CLOSE        close
+#define ALT_ENVIRON      environ
+#define ALT_EXECVE       execve
+#define ALT_EXIT         _exit
+#define ALT_FCNTL        fcntl
+#define ALT_FORK         fork
+#define ALT_FSTAT        fstat
+#define ALT_GETPID       getpid
+#define ALT_GETTIMEOFDAY gettimeofday
+#define ALT_IOCTL        ioctl
+#define ALT_ISATTY       isatty
+#define ALT_KILL         kill
+#define ALT_LINK         link
+#define ALT_LSEEK        lseek
+#define ALT_OPEN         open
+#define ALT_READ         read
+#define ALT_RENAME       _rename
+#define ALT_SBRK         sbrk
+#define ALT_SETTIMEOFDAY settimeofday
+#define ALT_STAT         stat
+#define ALT_UNLINK       unlink
+#define ALT_USLEEP       usleep
+#define ALT_WAIT         wait
+#define ALT_WRITE        write
+#define ALT_TIMES        times
+
+/*
+ *
+ */
+
+#endif /* __ALT_SYSCALL_H__ */

software/signal_processing_bsp/HAL/inc/priv/alt_alarm.h

+#ifndef __ALT_PRIV_ALARM_H__
+#define __ALT_PRIV_ALARM_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2017,2004 Altera Corporation, San Jose, California, USA.      *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
+*                                                                             *
+******************************************************************************/
+
+#include "alt_types.h"
+
+/*
+ * This header provides the internal definitions required by the public 
+ * interface alt_alarm.h. These variables and structures are not guaranteed to 
+ * exist in future implementations of the HAL.
+ */
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+/*
+ * "alt_alarm_s" is a structure type used to maintain lists of alarm callback
+ * functions.
+ */
+
+struct alt_alarm_s
+{
+    alt_llist llist;       /* linked list */
+    alt_u64   time;        /* time in system ticks of the callback */
+    alt_u32 (*callback) (void* context); /* callback function. The return 
+                            * value is the period for the next callback; where 
+                            * zero indicates that the alarm should be removed 
+                            * from the list. 
+                            */
+    void* context;         /* Argument for the callback */
+};
+
+/*
+ * "_alt_tick_rate" is a global variable used to store the system clock rate 
+ * in ticks per second. This is initialised to zero, which coresponds to there
+ * being no system clock available. 
+ *
+ * It is then set to it's final value by the system clock driver through a call
+ * to alt_sysclk_init(). 
+ */
+
+extern alt_u32 _alt_tick_rate;
+
+/*
+ * "_alt_nticks" is a global variable which records the elapsed number of 
+ * system clock ticks since the last call to settimeofday() or since reset if
+ * settimeofday() has not been called.
+ */
+
+extern volatile alt_u64 _alt_nticks;
+
+/* The list of registered alarms. */
+
+extern alt_llist alt_alarm_list;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __ALT_PRIV_ALARM_H__ */

software/signal_processing_bsp/HAL/inc/priv/alt_busy_sleep.h

+#ifndef __ALT_BUSY_SLEEP_H
+#define __ALT_BUSY_SLEEP_H
+
+/*
+ * Copyright (c) 2003 Altera Corporation, San Jose, California, USA.  
+ * All rights reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to 
+ * deal in the Software without restriction, including without limitation the 
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is 
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in 
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ * The function alt_busy_sleep provides a busy loop implementation of usleep.
+ * This is used to provide usleep for the standalone HAL, or when the timer is
+ * unavailable in uC/OS-II.
+ */ 
+
+extern unsigned int alt_busy_sleep (unsigned int us);
+
+#endif /* __ALT_BUSY_SLEEP_H */

software/signal_processing_bsp/HAL/inc/priv/alt_dev_llist.h

+#ifndef __ALT_DEV_LLIST_H__
+#define __ALT_DEV_LLIST_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
+*                                                                             *
+******************************************************************************/
+
+#include "sys/alt_llist.h"
+#include "alt_types.h"
+
+/*
+ * This header provides the internal defenitions required to control file 
+ * access. These variables and functions are not guaranteed to exist in 
+ * future implementations of the HAL.
+ */
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+/*
+ * The alt_dev_llist is an internal structure used to form a common base 
+ * class for all device types. The use of this structure allows common code
+ * to be used to manipulate the various device lists.
+ */
+
+typedef struct {
+  alt_llist llist;
+  const char* name;
+} alt_dev_llist;
+
+/*
+ *
+ */
+
+extern int alt_dev_llist_insert (alt_dev_llist* dev, alt_llist* list);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __ALT_DEV_LLIST_H__ */

software/signal_processing_bsp/HAL/inc/priv/alt_exception_handler_registry.h

+#ifndef __ALT_EXCEPTION_HANDLER_REGISTRY_H__
+#define __ALT_EXCEPTION_HANDLER_REGISTRY_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2008 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+#include "sys/alt_exceptions.h"
+
+/* Function pointer to exception callback routine */
+extern alt_exception_result (*alt_instruction_exception_handler)
+  (alt_exception_cause, alt_u32, alt_u32);
+
+#endif /* __ALT_EXCEPTION_HANDLER_REGISTRY_H__ */

software/signal_processing_bsp/HAL/inc/priv/alt_file.h

+#ifndef __ALT_FILE_H__
+#define __ALT_FILE_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
+*                                                                             *
+******************************************************************************/
+
+#include "sys/alt_dev.h"
+#include "sys/alt_llist.h"
+#include "os/alt_sem.h"
+
+#include "alt_types.h"
+
+/*
+ * This header provides the internal defenitions required to control file 
+ * access. These variables and functions are not guaranteed to exist in 
+ * future implementations of the HAL.
+ */
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+/*
+ * The function alt_find_dev() is used to search the device list "list" to
+ * locate a device named "name". If a match is found, then a pointer to the
+ * device is returned, otherwise NULL is returned. 
+ */
+ 
+extern alt_dev* alt_find_dev (const char* name, alt_llist* list);
+
+/*
+ * alt_find_file() is used to search the list of registered file systems to
+ * find the filesystem that the file named "name" belongs to. If a match is
+ * found, then a pointer to the filesystems alt_dev structure is returned,
+ * otherwise NULL is returned.
+ *
+ * Note that a match does not indicate that the file exists, only that a 
+ * filesystem exists that is registered for a partition that could contain
+ * the file. The filesystems open() function would need to be called in order
+ * to determine if the file exists.
+ */
+
+extern alt_dev* alt_find_file (const char* name);
+
+/*
+ * alt_get_fd() is used to allocate a file descriptor for the device or 
+ * filesystem "dev". A negative return value indicates an error, otherwise the
+ * return value is the index of the file descriptor within the file descriptor
+ * pool.
+ */
+
+extern int alt_get_fd (alt_dev* dev);
+
+/*
+ * alt_release_fd() is called to free the file descriptor with index "fd".
+ */
+
+extern void alt_release_fd (int fd);
+
+/*
+ * alt_fd_lock() is called by ioctl() to mark the file descriptor "fd" as 
+ * being open for exclusive access. Subsequent calls to open() for the device 
+ * associated with "fd" will fail. A device is unlocked by either calling 
+ * close() for "fd", or by an alternate call to ioctl() (see ioctl.c for 
+ * details).
+ */
+
+extern int alt_fd_lock (alt_fd* fd);
+
+/*
+ * alt_fd_unlock() is called by ioctl() to unlock a descriptor previously 
+ * locked by a call to alt_fd_lock().
+ */
+
+extern int alt_fd_unlock (alt_fd* fd);
+
+/*
+ * "alt_fd_list" is the pool of file descriptors.
+ */
+
+extern alt_fd alt_fd_list[];
+
+/*
+ * flags used by alt_fd. 
+ *
+ * ALT_FD_EXCL is used to mark a file descriptor as locked for exclusive
+ * access, i.e. further calls to open() for the associated device should
+ * fail.
+ *
+ * ALT_FD_DEV marks a dile descriptor as belonging to a device as oposed to a
+ * filesystem. 
+ */
+
+#define ALT_FD_EXCL 0x80000000
+#define ALT_FD_DEV  0x40000000
+
+#define ALT_FD_FLAGS_MASK (ALT_FD_EXCL | ALT_FD_DEV)
+
+/*
+ * "alt_dev_list" is the head of the linked list of registered devices.
+ */
+
+extern alt_llist alt_dev_list;
+
+/*
+ * "alt_fs_list" is the head of the linked list of registered filesystems.
+ */
+
+extern alt_llist alt_fs_list;
+
+/*
+ * "alt_fd_list_lock" is a semaphore used to ensure that access to the pool
+ * of file descriptors is thread safe.
+ */
+
+ALT_EXTERN_SEM(alt_fd_list_lock)
+
+/*
+ * "alt_max_fd" is a 'high water mark'. It indicates the highest file 
+ * descriptor allocated. Use of this can save searching the entire pool
+ * for active file descriptors, which helps avoid contention on access 
+ * to the file descriptor pool.
+ */
+ 
+extern alt_32 alt_max_fd;
+
+/*
+ * alt_io_redirect() is called at startup to redirect stdout, stdin, and 
+ * stderr to the devices named in the input arguments. By default these streams
+ * are directed at /dev/null, and are then redirected using this function once
+ * all of the devices have been registered within the system. 
+ */
+
+extern void alt_io_redirect(const char* stdout_dev, 
+                            const char* stdin_dev, 
+                            const char* stderr_dev);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __ALT_FILE_H__ */

software/signal_processing_bsp/HAL/inc/priv/alt_iic_isr_register.h

+#ifndef __ALT_IIC_ISR_REGISTER_H_
+#define __ALT_IIC_ISR_REGISTER_H_
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2009 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+#include "alt_types.h"
+#include "sys/alt_irq.h"
+
+extern int alt_iic_isr_register(alt_u32 ic_id, alt_u32 irq, alt_isr_func isr, 
+  void *isr_context, void *flags);
+
+#endif /* __ALT_IIC_ISR_REGISTER_H_ */

software/signal_processing_bsp/HAL/inc/priv/alt_irq_table.h

+#ifndef __ALT_IRQ_TABLE_H__
+#define __ALT_IRQ_TABLE_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2009      Altera Corporation, San Jose, California, USA.      *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
+*                                                                             *
+******************************************************************************/
+
+/*
+ * Definition of a table describing each interrupt handler. The index into 
+ * the array is the interrupt id associated with the handler. 
+ *
+ * When an interrupt occurs, the associated handler is called with
+ * the argument stored in the context member.
+ *
+ * The table is physically created in alt_irq_handler.c 
+ */
+extern struct ALT_IRQ_HANDLER
+{
+#ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT
+  void (*handler)(void*);
+#else
+  void (*handler)(void*, alt_u32);
+#endif
+  void *context;
+} alt_irq[ALT_NIRQ];
+
+#endif

software/signal_processing_bsp/HAL/inc/priv/alt_legacy_irq.h

+#ifndef __ALT_LEGACY_IRQ_H__
+#define __ALT_LEGACY_IRQ_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2009 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+
+/*
+ * This file provides prototypes and inline implementations of certain routines
+ * used by the legacy interrupt API. Do not include this in your driver or 
+ * application source files, use "sys/alt_irq.h" instead to access the proper
+ * public API.
+ */
+ 
+#include <errno.h>
+#include "system.h"
+
+#ifndef NIOS2_EIC_PRESENT
+
+#include "nios2.h"
+#include "alt_types.h"
+
+#include "sys/alt_irq.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+/*
+ * alt_irq_register() can be used to register an interrupt handler. If the 
+ * function is succesful, then the requested interrupt will be enabled upon 
+ * return.
+ */
+extern int alt_irq_register (alt_u32 id, 
+                             void*   context, 
+                             alt_isr_func handler);
+
+/*
+ * alt_irq_disable() disables the individual interrupt indicated by "id".
+ */
+static ALT_INLINE int ALT_ALWAYS_INLINE alt_irq_disable (alt_u32 id)
+{
+  alt_irq_context  status;
+  extern volatile alt_u32 alt_irq_active;
+
+  status = alt_irq_disable_all ();
+
+  alt_irq_active &= ~(1 << id);
+  NIOS2_WRITE_IENABLE (alt_irq_active);
+
+  alt_irq_enable_all(status);
+
+  return 0;
+}
+
+/*
+ * alt_irq_enable() enables the individual interrupt indicated by "id".
+ */
+static ALT_INLINE int ALT_ALWAYS_INLINE alt_irq_enable (alt_u32 id)
+{
+  alt_irq_context  status;
+  extern volatile alt_u32 alt_irq_active;
+
+  status = alt_irq_disable_all ();
+
+  alt_irq_active |= (1 << id);
+  NIOS2_WRITE_IENABLE (alt_irq_active);
+
+  alt_irq_enable_all(status);
+
+  return 0;
+}
+
+#ifndef ALT_EXCEPTION_STACK
+/*
+ * alt_irq_initerruptable() should only be called from within an ISR. It is used
+ * to allow higer priority interrupts to interrupt the current ISR. The input
+ * argument, "priority", is the priority, i.e. interrupt number of the current
+ * interrupt.
+ *
+ * If this function is called, then the ISR is required to make a call to
+ * alt_irq_non_interruptible() before returning. The input argument to
+ * alt_irq_non_interruptible() is the return value from alt_irq_interruptible().
+ *
+ * Care should be taken when using this pair of functions, since they increasing
+ * the system overhead associated with interrupt handling.
+ *
+ * If you are using an exception stack then nested interrupts won't work, so
+ * these functions are not available in that case.
+ */
+static ALT_INLINE alt_u32 ALT_ALWAYS_INLINE alt_irq_interruptible (alt_u32 priority)
+{
+  extern volatile alt_u32 alt_priority_mask;
+  extern volatile alt_u32 alt_irq_active;
+
+  alt_u32 old_priority;
+
+  old_priority      = alt_priority_mask;
+  alt_priority_mask = (1 << priority) - 1;
+
+  NIOS2_WRITE_IENABLE (alt_irq_active & alt_priority_mask);
+
+  NIOS2_WRITE_STATUS (1);
+
+  return old_priority; 
+}
+
+/*
+ * See Comments above for alt_irq_interruptible() for an explanation of the use of this
+ * function.
+ */
+static ALT_INLINE void ALT_ALWAYS_INLINE alt_irq_non_interruptible (alt_u32 mask)
+{
+  extern volatile alt_u32 alt_priority_mask;
+  extern volatile alt_u32 alt_irq_active;
+
+  NIOS2_WRITE_STATUS (0);  
+
+  alt_priority_mask = mask;
+
+  NIOS2_WRITE_IENABLE (mask & alt_irq_active);  
+}
+#endif /* ALT_EXCEPTION_STACK */
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* NIOS2_EIC_PRESENT */
+
+#endif /* __ALT_LEGACY_IRQ_H__ */

software/signal_processing_bsp/HAL/inc/priv/alt_no_error.h

+#ifndef __ALT_NO_ERROR_H__
+#define __ALT_NO_ERROR_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
+*                                                                             *
+******************************************************************************/
+
+#include "alt_types.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+/*
+ * alt_no_error() is a dummy function used by alt_sem.h and alt_flag.h. It
+ * substitutes for functions that have a return code by creating a function 
+ * that always returns zero. 
+ *
+ * This may seem a little obscure, but what happens is that the compiler can 
+ * then optomise away the call to this function, and any code written which
+ * handles the error path (i.e. non zero return values). 
+ *
+ * This allows code to be written which correctly use the uC/OS-II semaphore
+ * and flag utilities, without the use of those utilities impacting on 
+ * excutables built for a single threaded HAL environment.
+ *
+ * This function is considered to be part of the internal implementation of
+ * the HAL, and should not be called directly by application code or device
+ * drivers. It is not guaranteed to be preserved in future versions of the
+ * HAL.
+ */
+
+static ALT_INLINE int ALT_ALWAYS_INLINE alt_no_error (void)
+{
+  return 0;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __ALT_NO_ERROR_H__ */

software/signal_processing_bsp/HAL/inc/priv/nios2_gmon_data.h

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2003 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+#ifndef NIOS2_GMON_DATA_H
+#define NIOS2_GMON_DATA_H
+
+#define GMON_DATA_SIG  0
+#define GMON_DATA_WORDS 1
+#define GMON_DATA_PROFILE_DATA 2
+#define GMON_DATA_PROFILE_LOWPC 3
+#define GMON_DATA_PROFILE_HIGHPC 4
+#define GMON_DATA_PROFILE_BUCKET 5
+#define GMON_DATA_PROFILE_RATE 6
+#define GMON_DATA_MCOUNT_START 7
+#define GMON_DATA_MCOUNT_LIMIT 8
+
+#define GMON_DATA_SIZE 9
+
+extern unsigned int alt_gmon_data[GMON_DATA_SIZE];
+
+#endif

software/signal_processing_bsp/HAL/inc/sys/alt_alarm.h

+#ifndef __ALT_ALARM_H__
+#define __ALT_ALARM_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2017,2004 Altera Corporation, San Jose, California, USA.      *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
+*                                                                             *
+******************************************************************************/
+
+#include "alt_llist.h"
+#include "alt_types.h"
+
+#include "priv/alt_alarm.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+/*
+ * "alt_alarm" is a structure type used by applications to register an alarm
+ * callback function. An instance of this type must be passed as an input
+ * argument to alt_alarm_start(). The user is not responsible for initialising
+ * the contents of the instance. This is done by alt_alarm_start(). 
+ */
+
+typedef struct alt_alarm_s alt_alarm;
+
+/* 
+ * alt_alarm_start() can be called by an application/driver in order to register
+ * a function for periodic callback at the system clock frequency. Be aware that
+ * this callback is likely to occur in interrupt context. 
+ */
+
+extern int alt_alarm_start (alt_alarm* the_alarm, 
+                            alt_u32    nticks, 
+                            alt_u32    (*callback) (void* context),
+                            void*      context);
+
+/*
+ * alt_alarm_stop() is used to unregister a callback. Alternatively the callback 
+ * can return zero to unregister.
+ */
+
+extern void alt_alarm_stop (alt_alarm* the_alarm);
+
+/*
+ * Obtain the system clock rate in ticks/s. 
+ */
+
+static ALT_INLINE alt_u32 ALT_ALWAYS_INLINE alt_ticks_per_second (void)
+{
+  return _alt_tick_rate;
+}
+
+/*
+ * alt_sysclk_init() is intended to be only used by the system clock driver
+ * in order to initialise the value of the clock frequency.
+ */
+
+static ALT_INLINE int ALT_ALWAYS_INLINE alt_sysclk_init (alt_u32 nticks)
+{
+  if (! _alt_tick_rate)
+  {
+    _alt_tick_rate = nticks;
+    return 0;
+  }
+  else
+  {
+    return -1;
+  }
+}
+
+/*
+ * alt_nticks() returns the elapsed number of system clock ticks since reset.
+ */
+
+static ALT_INLINE alt_u64 ALT_ALWAYS_INLINE alt_nticks (void)
+{
+  return _alt_nticks;
+}
+
+/*
+ * alt_tick() should only be called by the system clock driver. This is used
+ * to notify the system that the system timer period has expired.
+ */
+
+extern void alt_tick (void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __ALT_ALARM_H__ */

software/signal_processing_bsp/HAL/inc/sys/alt_cache.h

+#ifndef __ALT_CACHE_H__
+#define __ALT_CACHE_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2003, 2007 Altera Corporation, San Jose, California, USA.     *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+
+#include <stdlib.h>
+
+#include "alt_types.h"
+
+/*
+ * alt_cache.h defines the processor specific functions for manipulating the
+ * cache.
+ */
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+/*
+ * alt_icache_flush() is called to flush the instruction cache for a memory
+ * region of length "len" bytes, starting at address "start".
+ */
+
+extern void alt_icache_flush (void* start, alt_u32 len);
+
+/*
+ * alt_dcache_flush() is called to flush the data cache for a memory
+ * region of length "len" bytes, starting at address "start".
+ * Any dirty lines in the data cache are written back to memory.
+ */
+
+extern void alt_dcache_flush (void* start, alt_u32 len);
+
+/*
+ * alt_dcache_flush() is called to flush the data cache for a memory
+ * region of length "len" bytes, starting at address "start".
+ * Any dirty lines in the data cache are NOT written back to memory.
+ */
+
+extern void alt_dcache_flush_no_writeback (void* start, alt_u32 len);
+
+/*
+ * Flush the entire instruction cache.
+ */
+
+extern void alt_icache_flush_all (void);
+
+/*
+ * Flush the entire data cache.
+ */
+
+extern void alt_dcache_flush_all (void);
+
+/*
+ * Allocate a block of uncached memory.
+ */
+
+extern volatile void* alt_uncached_malloc (size_t size);
+
+/*
+ * Free a block of uncached memory.
+ */
+
+extern void alt_uncached_free (volatile void* ptr);
+
+/*
+ * Convert a pointer to a block of cached memory, into a block of
+ * uncached memory.
+ */
+
+extern volatile void* alt_remap_uncached (void* ptr, alt_u32 len);
+
+/*
+ * Convert a pointer to a block of uncached memory, into a block of
+ * cached memory.
+ */
+
+extern void* alt_remap_cached (volatile void* ptr, alt_u32 len);
+
+/*
+ *
+ */
+
+#ifdef __cplusplus
+}
+#endif
+  
+#endif /* __ALT_CACHE_H__ */

software/signal_processing_bsp/HAL/inc/sys/alt_debug.h

+#ifndef __ALT_DEBUG_H__
+#define __ALT_DEBUG_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2003 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+
+/*
+ * The ALT_DEVUG_ASSERT macro can be used to generate a debugger break 
+ * from within software. The break is generated if "condition" evaluates to
+ * false.
+ */
+
+#define ALT_DEBUG_ASSERT(condition) if (!condition) \
+{                                                   \
+  __asm__ volatile ("break");                       \
+}
+
+#endif /* __ALT_DEBUG_H__ */

software/signal_processing_bsp/HAL/inc/sys/alt_dev.h

+#ifndef __ALT_DEV_H__
+#define __ALT_DEV_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
+*                                                                             *
+******************************************************************************/
+
+#include "system.h"
+#include "sys/alt_llist.h"
+#include "priv/alt_dev_llist.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+/*
+ * The value ALT_IRQ_NOT_CONNECTED is used to represent an unconnected 
+ * interrupt line. It cannot evaluate to a valid interrupt number.
+ */
+
+#define ALT_IRQ_NOT_CONNECTED (-1)
+
+typedef struct alt_dev_s alt_dev;
+
+struct stat;
+
+/*
+ * The file descriptor structure definition.
+ */
+
+typedef struct alt_fd_s
+{
+  alt_dev* dev;
+  alt_u8*  priv;
+  int      fd_flags;
+} alt_fd;
+
+/* 
+ * The device structure definition. 
+ */
+ 
+struct alt_dev_s {
+  alt_llist    llist;     /* for internal use */
+  const char*  name; 
+  int (*open)  (alt_fd* fd, const char* name, int flags, int mode);
+  int (*close) (alt_fd* fd);
+  int (*read)  (alt_fd* fd, char* ptr, int len);
+  int (*write) (alt_fd* fd, const char* ptr, int len); 
+  int (*lseek) (alt_fd* fd, int ptr, int dir);
+  int (*fstat) (alt_fd* fd, struct stat* buf);
+  int (*ioctl) (alt_fd* fd, int req, void* arg);
+};
+
+/*
+ * Functions used to register device for access through the C standard 
+ * library.
+ *
+ * The only difference between alt_dev_reg() and alt_fs_reg() is the 
+ * interpretation that open() places on the device name. In the case of
+ * alt_dev_reg the device is assumed to be a particular character device,
+ * and so there must be an exact match in the name for open to succeed. 
+ * In the case of alt_fs_reg() the name of the device is treated as the
+ * mount point for a directory, and so any call to open() where the name 
+ * is the root of the device filename will succeed. 
+ */
+
+extern int alt_fs_reg  (alt_dev* dev); 
+
+static ALT_INLINE int alt_dev_reg (alt_dev* dev)
+{
+  extern alt_llist alt_dev_list;
+
+  return alt_dev_llist_insert ((alt_dev_llist*) dev, &alt_dev_list);
+}
+
+#ifdef __cplusplus
+}
+#endif
+ 
+#endif /* __ALT_DEV_H__ */

software/signal_processing_bsp/HAL/inc/sys/alt_dma.h

+#ifndef __ALT_DMA_H__
+#define __ALT_DMA_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004-2005 Altera Corporation, San Jose, California, USA.      *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
+*                                                                             *
+******************************************************************************/
+
+#include "sys/alt_dma_dev.h"
+#include "alt_types.h"
+
+#include <errno.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+/*
+ * This header contains the application side interface for accessing DMA 
+ * resources. See alt_dma_dev.h for the dma device driver interface.
+ *
+ * The interface model treats a DMA transaction as being composed of two 
+ * halves (read and write). 
+ *
+ * The application can supply data for transmit using an "alt_dma_txchan"
+ * descriptor. Alternatively an "alt_dma_rxchan" descriptor can be used to
+ * receive data.
+ */
+
+/*
+ * alt_dma_txchan_open() is used to obtain an "alt_dma_txchan" descriptor for
+ * a DMA transmit device. The name is the name of the associated physical
+ * device (e.g. "/dev/dma_0").
+ *
+ * The return value will be NULL on failure, and non-NULL otherwise. 
+ */
+
+extern alt_dma_txchan alt_dma_txchan_open (const char* name);
+
+/*
+ * alt_dma_txchan_close() is provided so that an application can notify the 
+ * system that it has finished with a given DMA transmit channel. This is only
+ * provided for completness.
+ */
+
+static ALT_INLINE int alt_dma_txchan_close (alt_dma_txchan dma)
+{
+  return 0;
+}
+
+/*
+ * alt_dma_txchan_send() posts a transmit request to a DMA transmit channel.
+ * The input arguments are:
+ *
+ * dma: the channel to use.
+ * from: a pointer to the start of the data to send.
+ * length: the length of the data to send in bytes.
+ * done: callback function that will be called once the data has been sent.
+ * handle: opaque value passed to "done".
+ *
+ * The return value will be negative if the request cannot be posted, and
+ * zero otherwise.
+ */
+
+static ALT_INLINE int alt_dma_txchan_send (alt_dma_txchan dma, 
+             const void* from, 
+             alt_u32 length,
+             alt_txchan_done* done, 
+             void* handle)
+{
+  return dma ? dma->dma_send (dma, 
+        from, 
+        length,
+        done, 
+        handle) : -ENODEV;
+}
+
+/*
+ * alt_dma_txchan_space() returns the number of tranmit requests that can be 
+ * posted to the specified DMA transmit channel.
+ *
+ * A negative value indicates that the value could not be determined. 
+ */
+
+static ALT_INLINE int alt_dma_txchan_space (alt_dma_txchan dma)
+{
+  return dma ? dma->space (dma) : -ENODEV;
+}
+
+/*
+ * alt_dma_txchan_ioctl() can be used to perform device specific I/O 
+ * operations on the indicated DMA transmit channel. For example some drivers
+ * support options to control the width of the transfer operations. See
+ * alt_dma_dev.h for the list of generic requests.
+ *
+ * A negative return value indicates failure, otherwise the interpretation
+ * of the return value is request specific.  
+ */
+
+static ALT_INLINE int alt_dma_txchan_ioctl (alt_dma_txchan dma, 
+              int            req, 
+              void*          arg)
+{
+  return dma ? dma->ioctl (dma, req, arg) : -ENODEV;
+}
+
+/*
+ * alt_dma_rxchan_open() is used to obtain an "alt_dma_rxchan" descriptor for
+ * a DMA receive channel. The name is the name of the associated physical
+ * device (e.g. "/dev/dma_0").
+ *
+ * The return value will be NULL on failure, and non-NULL otherwise. 
+ */
+
+extern alt_dma_rxchan alt_dma_rxchan_open (const char* dev);
+
+/*
+ * alt_dma_rxchan_close() is provided so that an application can notify the 
+ * system that it has finished with a given DMA receive channel. This is only
+ * provided for completness.
+ */
+
+static ALT_INLINE int alt_dma_rxchan_close (alt_dma_rxchan dma)
+{
+  return 0;
+}
+
+/*
+ *
+ */
+
+/*
+ * alt_dma_rxchan_prepare() posts a receive request to a DMA receive channel.
+ * 
+ * The input arguments are:
+ *
+ * dma: the channel to use.
+ * data: a pointer to the location that data is to be received to.
+ * len: the maximum length of the data to receive. 
+ * done: callback function that will be called once the data has been 
+ *       received.
+ * handle: opaque value passed to "done".
+ *
+ * The return value will be negative if the request cannot be posted, and
+ * zero otherwise.
+ */
+
+static ALT_INLINE int alt_dma_rxchan_prepare (alt_dma_rxchan   dma, 
+                                              void*            data,
+                                              alt_u32          len,
+                                              alt_rxchan_done* done,  
+                                              void*            handle)
+{
+  return dma ? dma->prepare (dma, data, len, done, handle) : -ENODEV;
+}
+
+/*
+ * alt_dma_rxchan_ioctl() can be used to perform device specific I/O 
+ * operations on the indicated DMA receive channel. For example some drivers
+ * support options to control the width of the transfer operations. See
+ * alt_dma_dev.h for the list of generic requests.
+ *
+ * A negative return value indicates failure, otherwise the interpretation
+ * of the return value is request specific.  
+ */
+
+static ALT_INLINE int alt_dma_rxchan_ioctl (alt_dma_rxchan dma, 
+              int            req, 
+              void*          arg)
+{
+  return dma ? dma->ioctl (dma, req, arg) : -ENODEV;
+}
+
+/*
+ * alt_dma_rxchan_depth() returns the depth of the receive FIFO used to store
+ * receive requests.
+ */
+
+static ALT_INLINE alt_u32 alt_dma_rxchan_depth(alt_dma_rxchan dma)
+{
+  return dma->depth;
+}
+
+/*
+ *
+ */
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ALT_DMA_H__ */

software/signal_processing_bsp/HAL/inc/sys/alt_dma_dev.h

+#ifndef __ALT_DMA_DEV_H__
+#define __ALT_DMA_DEV_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004-2005 Altera Corporation, San Jose, California, USA.      *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
+*                                                                             *
+******************************************************************************/
+
+#include "priv/alt_dev_llist.h"
+
+#include "alt_types.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+/*
+ * This header contains the device driver interface for accessing DMA 
+ * resources. See alt_dma.h for the DMA application side interface.
+ *
+ * The interface model treats a DMA transaction as being composed of two 
+ * halves (read and write). 
+ *
+ * An "alt_dma_txchan_dev" is used to describe the device associated with a
+ * DMA transmit channel. An "alt_dma_rxchan_dev" is used to describe the
+ * device associated with a DMA receive channel. 
+ */
+
+/*
+ * List of generic ioctl requests that may be supported by a DMA device.
+ *
+ * ALT_DMA_RX_ONLY_ON:    This causes a DMA channel to operate in a mode
+ *                        where only the receiver is under software control.
+ *                        The other side reads continously from a single
+ *                        location. The address to read is the argument to
+ *                        this request.
+ * ALT_DMA_RX_ONLY_OFF:   Return to the default mode where both the receive
+ *                        and transmit sides of the DMA can be under software
+ *                        control.
+ * ALT_DMA_TX_ONLY_ON:    This causes a DMA channel to operate in a mode
+ *                        where only the transmitter is under software control.
+ *                        The other side writes continously to a single
+ *                        location. The address to write to is the argument to
+ *                        this request.
+ * ALT_DMA_TX_ONLY_OFF:   Return to the default mode where both the receive
+ *                        and transmit sides of the DMA can be under software
+ *                        control.
+ * ALT_DMA_SET_MODE_8:    Transfer data in units of 8 bits.
+ * ALT_DMA_SET_MODE_16:   Transfer data in units of 16 bits.
+ * ALT_DMA_SET_MODE_32:   Transfer data in units of 32 bits.
+ * ALT_DMA_SET_MODE_64:   Transfer data in units of 64 bits.
+ * ALT_DMA_SET_MODE_128:  Transfer data in units of 128 bits.
+ * ALT_DMA_GET_MODE:      Get the current transfer mode.
+ *
+ * The use of the macros: ALT_DMA_TX_STREAM_ON, ALT_DMA_TX_STREAM_OFF
+ * ALT_DMA_RX_STREAM_OFF and ALT_DMA_RX_STREAM_ON are depreciated. You should
+ * instead use the macros: ALT_DMA_RX_ONLY_ON, ALT_DMA_RX_ONLY_OFF, 
+ * ALT_DMA_TX_ONLY_ON and ALT_DMA_TX_ONLY_OFF.
+ */
+
+#define ALT_DMA_TX_STREAM_ON  (0x1)
+#define ALT_DMA_TX_STREAM_OFF (0x2)
+#define ALT_DMA_RX_STREAM_ON  (0x3)
+#define ALT_DMA_RX_STREAM_OFF (0x4)
+#define ALT_DMA_SET_MODE_8    (0x5)
+#define ALT_DMA_SET_MODE_16   (0x6)
+#define ALT_DMA_SET_MODE_32   (0x7)
+#define ALT_DMA_SET_MODE_64   (0x8)
+#define ALT_DMA_SET_MODE_128  (0x9)
+#define ALT_DMA_GET_MODE      (0xa)
+
+#define ALT_DMA_RX_ONLY_ON    ALT_DMA_TX_STREAM_ON
+#define ALT_DMA_RX_ONLY_OFF   ALT_DMA_TX_STREAM_OFF
+#define ALT_DMA_TX_ONLY_ON    ALT_DMA_RX_STREAM_ON
+#define ALT_DMA_TX_ONLY_OFF   ALT_DMA_RX_STREAM_OFF
+
+/*
+ *
+ */
+
+typedef struct alt_dma_txchan_dev_s alt_dma_txchan_dev;
+typedef struct alt_dma_rxchan_dev_s alt_dma_rxchan_dev;
+
+typedef alt_dma_txchan_dev* alt_dma_txchan;
+typedef alt_dma_rxchan_dev* alt_dma_rxchan;
+
+typedef void (alt_txchan_done)(void* handle);
+typedef void (alt_rxchan_done)(void* handle, void* data);
+
+/*
+ * devices that provide a DMA transmit channel are required to provide an
+ * instance of the "alt_dma_txchan_dev" structure. 
+ */
+
+struct alt_dma_txchan_dev_s {
+  alt_llist  llist;                  /* for internal use */
+  const char* name;                  /* name of the device instance 
+                                      * (e.g. "/dev/dma_0"). 
+                                      */
+  int (*space) (alt_dma_txchan dma); /* returns the maximum number of 
+                                      * transmit requests that can be posted
+              */
+  int (*dma_send) (alt_dma_txchan dma,   
+         const void* from, 
+         alt_u32 len,
+         alt_txchan_done* done, 
+         void* handle);        /* post a transmit request */
+  int (*ioctl) (alt_dma_txchan dma, int req, void* arg); /* perform device
+              * specific I/O control.
+                                      */ 
+};
+
+/*
+ * devices that provide a DMA receive channel are required to provide an
+ * instance of the "alt_dma_rxchan_dev" structure. 
+ */
+
+struct alt_dma_rxchan_dev_s {
+  alt_llist list;                    /* for internal use */
+  const char* name;                  /* name of the device instance 
+                                      * (e.g. "/dev/dma_0"). 
+                                      */
+  alt_u32        depth;              /* maximum number of receive requests that
+                                      * can be posted.
+                                      */
+  int (*prepare) (alt_dma_rxchan   dma, 
+                  void*            data,
+                  alt_u32          len,
+                  alt_rxchan_done* done,  
+                  void*            handle); /* post a receive request */
+  int (*ioctl) (alt_dma_rxchan dma, int req, void* arg);  /* perform device
+              * specific I/O control.
+                                      */ 
+};
+
+/*
+ * Register a DMA transmit channel with the system.
+ */
+
+static ALT_INLINE int alt_dma_txchan_reg (alt_dma_txchan_dev* dev)
+{
+  extern alt_llist alt_dma_txchan_list;
+
+  return alt_dev_llist_insert((alt_dev_llist*) dev, &alt_dma_txchan_list);
+}
+
+/*
+ * Register a DMA receive channel with the system.
+ */
+
+static ALT_INLINE int alt_dma_rxchan_reg (alt_dma_rxchan_dev* dev)
+{
+  extern alt_llist alt_dma_rxchan_list;
+
+  return alt_dev_llist_insert((alt_dev_llist*) dev, &alt_dma_rxchan_list);
+}
+
+/*
+ *
+ */
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ALT_DMA_DEV_H__ */

software/signal_processing_bsp/HAL/inc/sys/alt_driver.h

+#ifndef __ALT_DRIVER_H__
+#define __ALT_DRIVER_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2006 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/*
+ * Macros used to access a driver without HAL file descriptors.
+ */
+
+/*
+ * ALT_MODULE_CLASS
+ *
+ * This macro returns the module class name for the specified module instance.
+ * It uses information in the system.h file.
+ * Neither the instance name or class name are quoted (so that they can
+ * be used with other pre-processor macros).
+ *
+ * Example:
+ *   Assume the design has an instance of an altera_avalon_uart called uart1.
+ *   Calling ALT_MODULE_CLASS(uart1) returns altera_avalon_uart.
+ */
+
+#define ALT_MODULE_CLASS(instance) ALT_MODULE_CLASS_ ## instance
+
+
+/*
+ * ALT_DRIVER_FUNC_NAME
+ *
+ *   --> instance               Instance name.
+ *   --> func                   Function name.
+ *
+ * This macro returns the device driver function name of the specified
+ * module instance for the specified function name.
+ *
+ * Example:
+ *   Assume the design has an instance of an altera_avalon_uart called uart1.
+ *   Calling ALT_DRIVER_FUNC_NAME(uart1, write) returns 
+ *   altera_avalon_uart_write.
+ */
+
+#define ALT_DRIVER_FUNC_NAME(instance, func) \
+  ALT_DRIVER_FUNC_NAME1(ALT_MODULE_CLASS(instance), func)
+#define ALT_DRIVER_FUNC_NAME1(module_class, func) \
+  ALT_DRIVER_FUNC_NAME2(module_class, func)
+#define ALT_DRIVER_FUNC_NAME2(module_class, func) \
+  module_class ## _ ## func
+
+/*
+ * ALT_DRIVER_STATE_STRUCT
+ *
+ *   --> instance               Instance name.
+ *
+ * This macro returns the device driver state type name of the specified
+ * module instance.
+ *
+ * Example:
+ *   Assume the design has an instance of an altera_avalon_uart called uart1.
+ *   Calling ALT_DRIVER_STATE_STRUCT(uart1) returns:
+ *     struct altera_avalon_uart_state_s
+ *
+ * Note that the ALT_DRIVER_FUNC_NAME macro is used even though "state" isn't
+ * really a function but it does match the required naming convention.
+ */
+#define ALT_DRIVER_STATE_STRUCT(instance) \
+    struct ALT_DRIVER_FUNC_NAME(instance, state_s)
+
+/*
+ * ALT_DRIVER_STATE
+ *
+ *   --> instance               Instance name.
+ *
+ * This macro returns the device driver state name of the specified
+ * module instance.
+ *
+ * Example:
+ *   Assume the design has an instance of an altera_avalon_uart called uart1.
+ *   Calling ALT_DRIVER_STATE(uart1) returns uart1.
+ */
+#define ALT_DRIVER_STATE(instance) instance
+
+/*
+ * ALT_DRIVER_WRITE
+ *
+ *   --> instance               Instance name.
+ *   --> buffer                 Write buffer.
+ *   --> len                    Length of write buffer data.
+ *   --> flags                  Control flags (e.g. O_NONBLOCK)
+ *
+ * This macro calls the "write" function of the specified driver instance.
+ */
+
+#define ALT_DRIVER_WRITE_EXTERNS(instance)                                  \
+    extern ALT_DRIVER_STATE_STRUCT(instance) ALT_DRIVER_STATE(instance);    \
+    extern int ALT_DRIVER_FUNC_NAME(instance, write)                        \
+      (ALT_DRIVER_STATE_STRUCT(instance) *, const char *, int, int);
+
+#define ALT_DRIVER_WRITE(instance, buffer, len, flags)                      \
+    ALT_DRIVER_FUNC_NAME(instance, write)(&ALT_DRIVER_STATE(instance), buffer, len, flags)
+
+
+/*
+ * ALT_DRIVER_READ
+ *
+ *   --> instance               Instance name.
+ *   <-- buffer                 Read buffer.
+ *   --> len                    Length of read buffer.
+ *   --> flags                  Control flags (e.g. O_NONBLOCK)
+ *
+ * This macro calls the "read" function of the specified driver instance.
+ */
+
+#define ALT_DRIVER_READ_EXTERNS(instance)                                   \
+    extern ALT_DRIVER_STATE_STRUCT(instance) ALT_DRIVER_STATE(instance);    \
+    extern int ALT_DRIVER_FUNC_NAME(instance, read)                         \
+      (ALT_DRIVER_STATE_STRUCT(instance) *, const char *, int, int);
+
+#define ALT_DRIVER_READ(instance, buffer, len, flags)                       \
+    ALT_DRIVER_FUNC_NAME(instance, read)(&ALT_DRIVER_STATE(instance), buffer, len, flags)
+
+/*
+ * ALT_DRIVER_IOCTL
+ *
+ *   --> instance               Instance name.
+ *   --> req                    ioctl request (e.g. TIOCSTIMEOUT)
+ *   --> arg                    Optional argument (void*)
+ *
+ * This macro calls the "ioctl" function of the specified driver instance
+ */
+
+#define ALT_DRIVER_IOCTL_EXTERNS(instance)                                  \
+    extern ALT_DRIVER_STATE_STRUCT(instance) ALT_DRIVER_STATE(instance);    \
+    extern int ALT_DRIVER_FUNC_NAME(instance, ioctl)                        \
+      (ALT_DRIVER_STATE_STRUCT(instance) *, int, void*);
+
+#define ALT_DRIVER_IOCTL(instance, req, arg)                                \
+    ALT_DRIVER_FUNC_NAME(instance, ioctl)(&ALT_DRIVER_STATE(instance), req, arg)
+
+#endif /* __ALT_DRIVER_H__ */

software/signal_processing_bsp/HAL/inc/sys/alt_errno.h

+#ifndef __ALT_ERRNO_H__
+#define __ALT_ERRNO_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
+*                                                                             *
+******************************************************************************/
+
+/*
+ * errno is defined in <errno.h> so that it uses the thread local version 
+ * stored in the location pointed to by "_impure_ptr". This means that the 
+ * accesses to errno within the HAL library can cause the entirety of 
+ * of the structure pointed to by "_impure_ptr" to be added to the 
+ * users application. This can be undesirable in very small footprint systems.
+ *
+ * To avoid this happening, the HAL uses the macro ALT_ERRNO, defined below,
+ * to access errno, rather than accessing it directly. This macro will only 
+ * use the thread local version if some other code has already caused it to be 
+ * included into the system, otherwise it will use the global errno value.
+ *
+ * This causes a slight increases in code size where errno is accessed, but 
+ * can lead to significant overall benefits in very small systems. The 
+ * increase is inconsequential when compared to the size of the structure
+ * pointed to by _impure_ptr.
+ *
+ * Note that this macro accesses __errno() using an externally declared 
+ * function pointer (alt_errno). This is done so that the function call uses the
+ * subroutine call instruction via a register rather than an immediate address.
+ * This is important in the case that the code has been linked for a high
+ * address, but __errno() is not being used. In this case the weak linkage
+ * would have resulted in the instruction: "call 0" which would fail to link. 
+ */
+
+extern int* (*alt_errno) (void);
+
+/* Must define this so that values such as EBADFD are defined in errno.h. */
+#define __LINUX_ERRNO_EXTENSIONS__
+
+#include <errno.h>
+
+#include "alt_types.h"
+
+#undef errno
+
+extern int errno;
+
+static ALT_INLINE int* alt_get_errno(void)
+{
+  return ((alt_errno) ? alt_errno() : &errno);
+}
+
+#define ALT_ERRNO *alt_get_errno()
+
+#endif /* __ALT_ERRNO_H__ */

software/signal_processing_bsp/HAL/inc/sys/alt_exceptions.h

+#ifndef __ALT_EXCEPTIONS_H__
+#define __ALT_EXCEPTIONS_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2008 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+#include "alt_types.h"
+#include "system.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+/*
+ * This file defines instruction-generated exception handling and registry
+ * API, exception type enumeration, and handler return value enumeration for
+ * Nios II.
+ */
+
+/*
+ * The following enumeration describes the value in the CPU EXCEPTION
+ * register CAUSE bit field.
+ */
+enum alt_exception_cause_e {
+  /*
+   * This value is passed to an exception handler's cause argument if
+   * "extra exceptions" information (EXECPTION) register is not
+   * present in the processor hardware configuration.
+   */
+  NIOS2_EXCEPTION_CAUSE_NOT_PRESENT            = -1,
+
+  /*
+   * Real values
+   */
+  NIOS2_EXCEPTION_RESET                        = 0,
+  NIOS2_EXCEPTION_CPU_ONLY_RESET_REQUEST       = 1,
+  NIOS2_EXCEPTION_INTERRUPT                    = 2,
+  NIOS2_EXCEPTION_TRAP_INST                    = 3,
+  NIOS2_EXCEPTION_UNIMPLEMENTED_INST           = 4,
+  NIOS2_EXCEPTION_ILLEGAL_INST                 = 5,
+  NIOS2_EXCEPTION_MISALIGNED_DATA_ADDR         = 6,
+  NIOS2_EXCEPTION_MISALIGNED_TARGET_PC         = 7,
+  NIOS2_EXCEPTION_DIVISION_ERROR               = 8,
+  NIOS2_EXCEPTION_SUPERVISOR_ONLY_INST_ADDR    = 9,
+  NIOS2_EXCEPTION_SUPERVISOR_ONLY_INST         = 10,
+  NIOS2_EXCEPTION_SUPERVISOR_ONLY_DATA_ADDR    = 11,
+  NIOS2_EXCEPTION_TLB_MISS                     = 12,
+  NIOS2_EXCEPTION_TLB_EXECUTE_PERM_VIOLATION   = 13,
+  NIOS2_EXCEPTION_TLB_READ_PERM_VIOLATION      = 14,
+  NIOS2_EXCEPTION_TLB_WRITE_PERM_VIOLATION     = 15,
+  NIOS2_EXCEPTION_MPU_INST_REGION_VIOLATION    = 16,
+  NIOS2_EXCEPTION_MPU_DATA_REGION_VIOLATION    = 17,
+  NIOS2_EXCEPTION_ECC_TLB_ERR                  = 18,
+  NIOS2_EXCEPTION_ECC_FETCH_ERR                = 19,
+  NIOS2_EXCEPTION_ECC_REGISTER_FILE_ERR        = 20,
+  NIOS2_EXCEPTION_ECC_DATA_ERR                 = 21,
+  NIOS2_EXCEPTION_ECC_DATA_CACHE_WRITEBACK_ERR = 22
+};
+typedef enum alt_exception_cause_e alt_exception_cause;
+
+/*
+ * These define valid return values for a user-defined instruction-generated
+ * exception handler. The handler should return one of these to indicate
+ * whether to re-issue the instruction that triggered the exception, or to
+ * skip it.
+ */
+enum alt_exception_result_e {
+  NIOS2_EXCEPTION_RETURN_REISSUE_INST = 0,
+  NIOS2_EXCEPTION_RETURN_SKIP_INST    = 1
+};
+typedef enum alt_exception_result_e alt_exception_result;
+
+/*
+ * alt_instruction_exception_register() can be used to register an exception
+ * handler for instruction-generated exceptions that are not handled by the
+ * built-in exception handler (i.e. for interrupts).
+ *
+ * The registry API is optionally enabled through the "Enable
+ * Instruction-related Exception API" HAL BSP setting, which will
+ * define the macro below.
+ */
+#ifdef ALT_INCLUDE_INSTRUCTION_RELATED_EXCEPTION_API
+void alt_instruction_exception_register (
+  alt_exception_result (*exception_handler)(
+    alt_exception_cause cause,
+    alt_u32 exception_pc,
+    alt_u32 bad_addr) );
+#endif /*ALT_INCLUDE_INSTRUCTION_RELATED_EXCEPTION_API */
+
+/*
+ * alt_exception_cause_generated_bad_addr() indicates whether a particular
+ * exception cause value was from an exception-type that generated a valid
+ * address in the BADADDR register. The contents of BADADDR is passed to
+ * a user-registered exception handler in all cases, whether valid or not.
+ * This routine should be called to validate the bad_addr argument to
+ * your exception handler.
+ *
+ * Note that this routine will return false (0) for causes 
+ * NIOS2_EXCEPTION_TLB_MISS and NIOS2_EXCEPTION_ECC_TLB_ERR.
+ * You must read the TLBMISC.D field to determine if BADADDR
+ * is valid for these (valid if TLBMISC.D = 1).
+ */
+int alt_exception_cause_generated_bad_addr(alt_exception_cause cause);
+
+/*
+ * alt_ecc_fatal_exception_register() is called to register a handler to
+ * service likely fatal ECC error exceptions. Likely the handler will
+ * assume that correct execution of the running software is not possible
+ * and re-initialize the processor (e.g. jump to reset address).
+ * 
+ * Passing null (0x0) in the handler argument will disable a previously-
+ * registered handler.
+ *
+ * Note that if no handler is registered, just normal exception processing
+ * occurs on a likely fatal ECC exception and the exception processing
+ * code might trigger an infinite exception loop.
+ *
+ * Note that the handler isn't a C function: it must be written in 
+ * assembly-code because it doesn't support C language calling conventions
+ * and it can't return.
+ *
+ * The handler code must be carefully written to avoid triggering
+ * another fatal ECC exception and creating an infinite exception loop.
+ * The handler must avoid reading registers in case the fatal ECC
+ * error is a register file ECC error.
+ * If a data cache is present, the handler must avoid instructions that
+ * access the data cache in case the fatal ECC error is a data cache 
+ * related ECC error. This includes cacheable load, cacheable store, 
+ * non-cacheable store (because it looks in the data cache to update the
+ * data cache if it hits), and all data cache management instructions except
+ * for INITD.
+ */
+void alt_ecc_fatal_exception_register(alt_u32 handler);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ALT_EXCEPTIONS_H__ */

software/signal_processing_bsp/HAL/inc/sys/alt_flash.h

+#ifndef __ALT_FLASH_H__
+#define __ALT_FLASH_H__
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2015 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
+*                                                                             *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* Alt_flash.h - User interface for flash code                                 *
+*                                                                             *
+* Use this interface to avoid being exposed to the internals of the device    *
+* driver architecture. If you chose to use the flash driver internal          *
+* structures we don't guarantee not to change them                            *
+*                                                                             *
+* Author PRR                                                                  *
+*                                                                             *
+******************************************************************************/
+
+
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+#include "alt_types.h"
+#include "alt_flash_types.h"
+#include "alt_flash_dev.h"
+#include "sys/alt_cache.h"
+
+alt_flash_fd* alt_flash_open_dev(const char* name);
+void alt_flash_close_dev(alt_flash_fd* fd );
+
+/*
+ *  alt_flash_lock
+ *
+ *  Locks the range of the memory sectors, which 
+ *  protected from write and erase.
+ *
+ */
+static __inline__ int __attribute__ ((always_inline)) alt_lock_flash( 
+                                      alt_flash_fd* fd, alt_u32 sectors_to_lock)
+{
+  return fd->lock( fd, sectors_to_lock);
+}
+
+/*
+ *  alt_write_flash
+ *
+ *  Program a buffer into flash.
+ *
+ *  This routine erases all the affected erase blocks (if necessary)
+ *  and then programs the data. However it does not read the data out first
+ *  and preserve and none overwritten data, because this would require very 
+ *  large buffers on the target. If you need
+ *  that functionality use the functions below.
+ */
+static __inline__ int __attribute__ ((always_inline)) alt_write_flash(
+                                                           alt_flash_fd* fd, 
+                                                           int offset, 
+                                                           const void* src_addr, 
+                                                           int length )
+{
+  return fd->write( fd, offset, src_addr, length );
+}
+
+/*
+ *  alt_read_flash
+ *
+ *  Read a block of flash for most flashes this is just memcpy
+ *  it's here for completeness in case we need it for some serial flash device
+ *
+ */
+static __inline__ int __attribute__ ((always_inline)) alt_read_flash( 
+                                      alt_flash_fd* fd, int offset, 
+                                      void* dest_addr, int length )
+{
+  return fd->read( fd, offset, dest_addr, length );
+}
+
+/*
+ *  alt_get_flash_info
+ *
+ *  Return the information on the flash sectors.
+ * 
+ */
+static __inline__ int __attribute__ ((always_inline)) alt_get_flash_info( 
+                                      alt_flash_fd* fd, flash_region** info, 
+                                      int* number_of_regions)
+{
+  return fd->get_info( fd, info, number_of_regions);
+}
+
+/*
+ *  alt_erase_flash_block
+ *
+ *  Erase a particular erase block, pass in the offset to the start of 
+ *  the block and it's size
+ */
+static __inline__ int __attribute__ ((always_inline)) alt_erase_flash_block( 
+                                      alt_flash_fd* fd, int offset, int length) 
+{
+  int ret_code;
+  ret_code = fd->erase_block( fd, offset );
+  
+/* remove dcache_flush call for FB330552  
+  if(!ret_code)
+      alt_dcache_flush((alt_u8*)fd->base_addr + offset, length);
+*/
+  return ret_code;
+}
+
+/*
+ *  alt_write_flash_block
+ *
+ *  Write a particular flash block, block_offset is the offset 
+ *  (from the base of flash) to start of the block
+ *  data_offset is the offset (from the base of flash)
+ *  where you wish to start programming
+ *  
+ *  NB this function DOES NOT check that you are only writing a single
+ *  block of data as that would slow down this function. 
+ *
+ *  Use alt_write_flash if you want that level of error checking.
+ */
+
+static __inline__ int __attribute__ ((always_inline)) alt_write_flash_block( 
+                                      alt_flash_fd* fd, int block_offset,
+                                      int data_offset,
+                                      const void *data, int length)
+{
+
+  int ret_code;
+  ret_code = fd->write_block( fd, block_offset, data_offset, data, length );
+
+/* remove dcache_flush call for FB330552  
+  if(!ret_code)
+      alt_dcache_flush((alt_u8*)fd->base_addr + data_offset, length);
+*/
+  return ret_code;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __ALT_FLASH_H__ */

software/signal_processing_bsp/HAL/inc/sys/alt_flash_dev.h

+#ifndef __ALT_FLASH_DEV_H__
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2015 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
+*                                                                             *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* Alt_flash_dev.h - Generic Flash device interfaces                           *
+*                                                                             *
+* Author PRR                                                                  *
+*                                                                             *
+******************************************************************************/
+#define __ALT_FLASH_DEV_H__
+
+#include "alt_flash_types.h"
+#include "sys/alt_llist.h"
+#include "priv/alt_dev_llist.h"
+
+#include "alt_types.h"
+
+typedef struct alt_flash_dev alt_flash_dev; 
+typedef alt_flash_dev alt_flash_fd;
+
+static ALT_INLINE int alt_flash_device_register( alt_flash_fd* fd)
+{
+  extern alt_llist alt_flash_dev_list;
+
+  return alt_dev_llist_insert ((alt_dev_llist*) fd, &alt_flash_dev_list);
+}
+
+typedef alt_flash_dev* (*alt_flash_open)(alt_flash_dev* flash, 
+                                         const char* name );
+typedef int (*alt_flash_close)(alt_flash_dev* flash_info);
+
+typedef int (*alt_flash_write)( alt_flash_dev* flash, int offset, 
+                                const void* src_addr, int length );
+
+typedef int (*alt_flash_get_flash_info)( alt_flash_dev* flash, flash_region** info, 
+                                          int* number_of_regions);
+typedef int (*alt_flash_write_block)( alt_flash_dev* flash, int block_offset, 
+                                      int data_offset, const void* data, 
+                                      int length);
+typedef int (*alt_flash_erase_block)( alt_flash_dev* flash, int offset);
+typedef int (*alt_flash_read)(alt_flash_dev* flash, int offset, 
+                              void* dest_addr, int length );
+typedef int (*alt_flash_lock)(alt_flash_dev* flash, alt_u32 sectors_to_lock);						  
+
+struct alt_flash_dev
+{
+  alt_llist                 llist;
+  const char*               name;
+  alt_flash_open            open;
+  alt_flash_close           close;
+  alt_flash_write           write;
+  alt_flash_read            read;
+  alt_flash_get_flash_info  get_info;
+  alt_flash_erase_block     erase_block;
+  alt_flash_write_block     write_block;
+  void*                     base_addr;
+  int                       length;
+  int                       number_of_regions;
+  flash_region              region_info[ALT_MAX_NUMBER_OF_FLASH_REGIONS]; 
+  alt_flash_lock            lock;
+};
+
+#endif /* __ALT_FLASH_DEV_H__ */

software/signal_processing_bsp/HAL/inc/sys/alt_flash_types.h

+#ifndef __ALT_FLASH_TYPES_H__
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
+*                                                                             *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* Alt_flash_types.h - Some generic types and defines used by the flash code   *
+*                                                                             *
+* Author PRR                                                                  *
+*                                                                             *
+******************************************************************************/
+#define __ALT_FLASH_TYPES_H__
+
+#ifndef ALT_MAX_NUMBER_OF_FLASH_REGIONS
+#define ALT_MAX_NUMBER_OF_FLASH_REGIONS 8
+#endif /* ALT_MAX_NUMBER_OF_FLASH_REGIONS */
+
+/*
+ * Description of a single Erase region
+ */
+typedef struct flash_region
+{
+  int   offset;
+  int   region_size;
+  int   number_of_blocks;
+  int   block_size;
+}flash_region;
+
+#endif /* __ALT_FLASH_TYPES_H__ */

software/signal_processing_bsp/HAL/inc/sys/alt_irq.h

+#ifndef __ALT_IRQ_H__
+#define __ALT_IRQ_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2009 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+
+/*
+ * alt_irq.h is the Nios II specific implementation of the interrupt controller 
+ * interface.
+ *
+ * Nios II includes optional support for an external interrupt controller. 
+ * When an external controller is present, the "Enhanced" interrupt API
+ * must be used to manage individual interrupts. The enhanced API also
+ * supports the processor's internal interrupt controller. Certain API
+ * members are accessible from either the "legacy" or "enhanced" interrpt
+ * API. 
+ *
+ * Regardless of which API is in use, this file should be included by
+ * application code and device drivers that register ISRs or manage interrpts.
+ */
+#include <errno.h>
+
+#include "nios2.h"
+#include "alt_types.h"
+#include "system.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+/*
+ * Macros used by alt_irq_enabled
+ */
+#define ALT_IRQ_ENABLED  1
+#define ALT_IRQ_DISABLED 0  
+
+/* 
+ * Number of available interrupts in internal interrupt controller.
+ */
+#define ALT_NIRQ NIOS2_NIRQ
+
+/*
+ * Used by alt_irq_disable_all() and alt_irq_enable_all().
+ */
+typedef int alt_irq_context;
+
+/* ISR Prototype */
+#ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT
+typedef void (*alt_isr_func)(void* isr_context);
+#else
+typedef void (*alt_isr_func)(void* isr_context, alt_u32 id);
+#endif
+
+/*
+ * The following protypes and routines are supported by both
+ * the enhanced and legacy interrupt APIs
+ */
+ 
+/*
+ * alt_irq_enabled can be called to determine if the processor's global
+ * interrupt enable is asserted. The return value is zero if interrupts 
+ * are disabled, and non-zero otherwise.
+ *
+ * Whether the internal or external interrupt controller is present, 
+ * individual interrupts may still be disabled. Use the other API to query
+ * a specific interrupt. 
+ */
+static ALT_INLINE int ALT_ALWAYS_INLINE alt_irq_enabled (void)
+{
+  int status;
+
+  NIOS2_READ_STATUS (status);
+
+  return status & NIOS2_STATUS_PIE_MSK; 
+}
+
+/*
+ * alt_irq_disable_all() 
+ *
+ * This routine inhibits all interrupts by negating the status register PIE 
+ * bit. It returns the previous contents of the CPU status register (IRQ 
+ * context) which can be used to restore the status register PIE bit to its 
+ * state before this routine was called.
+ */
+static ALT_INLINE alt_irq_context ALT_ALWAYS_INLINE 
+       alt_irq_disable_all (void)
+{
+  alt_irq_context context;
+
+  NIOS2_READ_STATUS (context);
+
+  NIOS2_WRITE_STATUS (context & ~NIOS2_STATUS_PIE_MSK);
+  
+  return context;
+}
+
+/*
+ * alt_irq_enable_all() 
+ *
+ * Enable all interrupts that were previously disabled by alt_irq_disable_all()
+ *
+ * This routine accepts a context to restore the CPU status register PIE bit
+ * to the state prior to a call to alt_irq_disable_all().
+ 
+ * In the case of nested calls to alt_irq_disable_all()/alt_irq_enable_all(), 
+ * this means that alt_irq_enable_all() does not necessarily re-enable
+ * interrupts.
+ *
+ * This routine will perform a read-modify-write sequence to restore only
+ * status.PIE if the processor is configured with options that add additional 
+ * writeable status register bits. These include the MMU, MPU, the enhanced 
+ * interrupt controller port, and shadow registers. Otherwise, as a performance
+ * enhancement, status is overwritten with the prior context. 
+ */
+static ALT_INLINE void ALT_ALWAYS_INLINE 
+       alt_irq_enable_all (alt_irq_context context)
+{
+#if (NIOS2_NUM_OF_SHADOW_REG_SETS > 0) || (defined NIOS2_EIC_PRESENT) || \
+    (defined NIOS2_MMU_PRESENT) || (defined NIOS2_MPU_PRESENT)
+  alt_irq_context status;
+  
+  NIOS2_READ_STATUS (status);
+  
+  status &= ~NIOS2_STATUS_PIE_MSK;
+  status |= (context & NIOS2_STATUS_PIE_MSK);
+  
+  NIOS2_WRITE_STATUS (status);
+#else
+  NIOS2_WRITE_STATUS (context);
+#endif
+}
+
+/*
+ * The function alt_irq_init() is defined within the auto-generated file
+ * alt_sys_init.c. This function calls the initilization macros for all
+ * interrupt controllers in the system at config time, before any other
+ * non-interrupt controller driver is initialized.
+ *
+ * The "base" parameter is ignored and only present for backwards-compatibility.
+ * It is recommended that NULL is passed in for the "base" parameter.
+ */
+extern void alt_irq_init (const void* base);
+
+/*
+ * alt_irq_cpu_enable_interrupts() enables the CPU to start taking interrupts.
+ */
+static ALT_INLINE void ALT_ALWAYS_INLINE 
+       alt_irq_cpu_enable_interrupts (void)
+{
+    NIOS2_WRITE_STATUS(NIOS2_STATUS_PIE_MSK
+#if defined(NIOS2_EIC_PRESENT) && (NIOS2_NUM_OF_SHADOW_REG_SETS > 0)
+    | NIOS2_STATUS_RSIE_MSK
+#endif      
+      );
+}
+
+
+/*
+ * Prototypes for the enhanced interrupt API.
+ */
+#ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT
+/*
+ * alt_ic_isr_register() can be used to register an interrupt handler. If the
+ * function is succesful, then the requested interrupt will be enabled upon 
+ * return.
+ */
+extern int alt_ic_isr_register(alt_u32 ic_id,
+                        alt_u32 irq,
+                        alt_isr_func isr,
+                        void *isr_context,
+                        void *flags);
+
+/* 
+ * alt_ic_irq_enable() and alt_ic_irq_disable() enable/disable a specific 
+ * interrupt by using IRQ port and interrupt controller instance.
+ */
+int alt_ic_irq_enable (alt_u32 ic_id, alt_u32 irq);
+int alt_ic_irq_disable(alt_u32 ic_id, alt_u32 irq);        
+
+ /* 
+ * alt_ic_irq_enabled() indicates whether a specific interrupt, as
+ * specified by IRQ port and interrupt controller instance is enabled.
+ */        
+alt_u32 alt_ic_irq_enabled(alt_u32 ic_id, alt_u32 irq);
+
+#else 
+/*
+ * Prototypes for the legacy interrupt API.
+ */
+#include "priv/alt_legacy_irq.h"
+#endif 
+
+
+/*
+ * alt_irq_pending() returns a bit list of the current pending interrupts.
+ * This is used by alt_irq_handler() to determine which registered interrupt
+ * handlers should be called.
+ *
+ * This routine is only available for the Nios II internal interrupt
+ * controller.
+ */
+#ifndef NIOS2_EIC_PRESENT
+static ALT_INLINE alt_u32 ALT_ALWAYS_INLINE alt_irq_pending (void)
+{
+  alt_u32 active;
+
+  NIOS2_READ_IPENDING (active);
+
+  return active;
+}
+#endif 
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ALT_IRQ_H__ */

software/signal_processing_bsp/HAL/inc/sys/alt_irq_entry.h

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2003 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+
+/*
+ * This file pulls in the IRQ entry assembler and C code, which is only
+ * required if there are any interruptes in the system.
+ */
+
+__asm__( "\n\t.globl alt_irq_entry" );
+
+__asm__( "\n\t.globl alt_irq_handler" );
+

software/signal_processing_bsp/HAL/inc/sys/alt_license_reminder_ucosii.h

+#ifndef __ALT_LICENSE_REMINDER_UCOSII_H__
+#define __ALT_LICENSE_REMINDER_UCOSII_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2006 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
+*                                                                             *
+******************************************************************************/
+
+#include <stdio.h>
+
+#define ALT_LICENSE_REMINDER_UCOSII_STRING                                     \
+    "============== Software License Reminder ===============\n"               \
+    "\n"                                                                       \
+    "uC/OS-II is provided in source form for FREE evaluation,\n"               \
+    "for educational use, or for peaceful research. If you\n"                  \
+    "plan on using uC/OS-II in a commercial product you need\n"                \
+    "to contact Micrium to properly license its use in your\n"                 \
+    "product. Micrium provides ALL the source code on the\n"                   \
+    "Altera distribution for your convenience and to help you\n"               \
+    "experience uC/OS-II. The fact that the source is provided\n"              \
+    "does NOT mean that you can use it without paying a\n"                     \
+    "licensing fee. Please help us continue to provide the\n"                  \
+    "Embedded community with the finest software available.\n"                 \
+    "Your honesty is greatly appreciated.\n"                                   \
+    "\n"                                                                       \
+    "Please contact:\n"                                                        \
+    "\n"                                                                       \
+    "M I C R I U M\n"                                                          \
+    "949 Crestview Circle\n"                                                   \
+    "Weston,  FL 33327-1848\n"                                                 \
+    "U.S.A.\n"                                                                 \
+    "\n"                                                                       \
+    "Phone : +1 954 217 2036\n"                                                \
+    "FAX   : +1 954 217 2037\n"                                                \
+    "WEB   : www.micrium.com\n"                                                \
+    "E-mail: Sales@Micrium.com\n"                                              \
+    "\n"                                                                       \
+    "========================================================\n"
+
+#define alt_license_reminder_ucosii() puts(ALT_LICENSE_REMINDER_UCOSII_STRING)
+
+
+#endif /* __ALT_LICENSE_REMINDER_UCOSII_H__ */
+

software/signal_processing_bsp/HAL/inc/sys/alt_llist.h

+#ifndef __ALT_LIST_H__
+#define __ALT_LIST_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
+*                                                                             *
+******************************************************************************/
+
+#include "alt_types.h"
+
+/*
+ * alt_llist.h defines structures and functions for use in manipulating linked
+ * lists. A list is considered to be constructed from a chain of objects of
+ * type alt_llist, with one object being defined to be the head element. 
+ *
+ * A list is considered to be empty if it only contains the head element.
+ */
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+/*
+ * alt_llist is the structure used to represent an element within a linked
+ * list.
+ */
+
+typedef struct alt_llist_s alt_llist;
+
+struct alt_llist_s {
+  alt_llist* next;     /* Pointer to the next element in the list. */
+  alt_llist* previous; /* Pointer to the previous element in the list. */
+};
+
+/*
+ * ALT_LLIST_HEAD is a macro that can be used to create the head of a new 
+ * linked list. This is named "head". The head element is initialised to 
+ * represent an empty list.  
+ */
+
+#define ALT_LLIST_HEAD(head) alt_llist head = {&head, &head}
+
+/*
+ * ALT_LLIST_ENTRY is a macro used to define an uninitialised linked list
+ * entry. This is used to reserve space in structure initialisation for
+ * structures that inherit form alt_llist.
+ */
+
+#define ALT_LLIST_ENTRY {0, 0}
+
+/*
+ * alt_llist_insert() insert adds the linked list entry "entry" as the 
+ * first entry in the linked list "list". "list" is the list head element.  
+ */
+
+static ALT_INLINE void ALT_ALWAYS_INLINE alt_llist_insert(alt_llist* list, 
+                alt_llist* entry)
+{
+  entry->previous = list;
+  entry->next     = list->next;
+
+  list->next->previous = entry;
+  list->next           = entry;
+}
+
+/*
+ * alt_llist_remove() is called to remove an element from a linked list. The
+ * input argument is the element to remove.
+ */
+     
+static ALT_INLINE void ALT_ALWAYS_INLINE alt_llist_remove(alt_llist* entry)
+{
+  entry->next->previous = entry->previous;
+  entry->previous->next = entry->next;
+
+  /* 
+   * Set the entry to point to itself, so that any further calls to
+   * alt_llist_remove() are harmless.
+   */
+
+  entry->previous = entry;
+  entry->next     = entry;
+} 
+
+#ifdef __cplusplus
+}
+#endif
+ 
+#endif /* __ALT_LLIST_H__ */ 

software/signal_processing_bsp/HAL/inc/sys/alt_load.h

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2005 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include "alt_types.h"
+
+/*
+ * This macro is used to load code/data from its load address to its 
+ * execution address for a given section. The section name is the input
+ * argument. Note that a leading '.' is assumed in the name. For example
+ * to load the section .onchip_ram, use:
+ * 
+ * ALT_LOAD_SECTION_BY_NAME(onchip_ram);
+ * 
+ * This requires that the apropriate linker symbols have been generated
+ * for the section in question. This will be the case if you are using the
+ * default linker script.
+ */ 
+
+#define ALT_LOAD_SECTION_BY_NAME(name)                         \
+  {                                                            \
+    extern void _alt_partition_##name##_start;                 \
+    extern void _alt_partition_##name##_end;                   \
+    extern void _alt_partition_##name##_load_addr;             \
+                                                               \
+    alt_load_section(&_alt_partition_##name##_load_addr,       \
+                     &_alt_partition_##name##_start,           \
+                     &_alt_partition_##name##_end);            \
+  }
+
+/*
+ * Function used to load an individual section from flash to RAM.
+ *
+ * There is an implicit assumption here that the linker script will ensure
+ * that all sections are word aligned.
+ *
+ */
+
+static void ALT_INLINE alt_load_section (alt_u32* from, 
+                                         alt_u32* to, 
+                                         alt_u32* end)
+{
+  if (to != from)
+  {
+    while( to != end )
+    {
+      *to++ = *from++;
+    }
+  }
+}

software/signal_processing_bsp/HAL/inc/sys/alt_log_printf.h

+/*  alt_log_printf.h
+ *
+ *  ALT_LOG is designed to provide extra logging/debugging messages from HAL
+ *  through a different port than stdout.  It is enabled by the ALT_LOG_ENABLE
+ *  define, which needs to supplied at compile time.  When logging is turned off, 
+ *  code size is unaffected.  Thus, this should be transparent to the user
+ *  when it is not actively turned on, and should not affect projects in any way.
+ *
+ *  There are macros sprinkled within different components, such as the jtag uart 
+ *  and timer, in the HAL code.  They are always named ALT_LOG_<name>, and can be
+ *  safely ignored if ALT_LOG is turned off. 
+ *
+ *  To turn on ALT_LOG, ALT_LOG_ENABLE must be defined, and ALT_LOG_PORT_TYPE and
+ *  ALT_LOG_PORT_BASE must be set in system.h.  This is done through editing 
+ *  <project>.ptf, by editing the alt_log_port_type & alt_log_port_base settings.
+ *  See the documentation html file for examples.
+ *
+ *  When it is turned on, it will output extra HAL messages to a port specified
+ *  in system.h.  This can be a UART or JTAG UART port.  By default it will 
+ *  output boot messages, detailing every step of the boot process.  
+ *
+ *  Extra logging is designed to be enabled by flags, which are defined in 
+ *  alt_log_printf.c.  The default value is that all flags are off, so only the
+ *  boot up logging messages show up.  ALT_LOG_FLAGS can be set to enable certain
+ *  groupings of flags, and that grouping is done in this file.  Each flag can 
+ *  also be overridden with a -D at compile time.
+ *
+ *  This header file includes the necessary prototypes for using the alt_log
+ *  functions.  It also contains all the macros that are used to remove the code
+ *  from alt log is turned off.  Also, the macros in other HAL files are defined 
+ *  here at the bottom.  These macros all call some C function that is in 
+ *  alt_log_printf.c.
+ *
+ *  The logging has functions for printing in C (ALT_LOG_PRINTF) and in assembly
+ *  (ALT_LOG_PUTS).  This was needed because the assembly printing occurs before
+ *  the device is initialized.  The assembly function corrupts register R4-R7, 
+ *  which are not used in the normal boot process.  For this reason, do not call
+ *  the assembly function in C.
+ *
+ *  author: gkwan 
+ */
+
+
+#ifndef __ALT_LOG_PRINTF_H__
+#define __ALT_LOG_PRINTF_H__
+
+#include <system.h>
+
+/* Global switch to turn on logging functions */
+#ifdef ALT_LOG_ENABLE
+
+    /* ALT_LOG_PORT_TYPE values as defined in system.h.  They are defined as
+     * numbers here first becasue the C preprocessor does not handle string
+     * comparisons.  */
+    #define ALTERA_AVALON_JTAG_UART 1
+    #define ALTERA_AVALON_UART 0
+
+    /* If this .h file is included by an assembly file, skip over include files
+     * that won't compile in assembly. */
+    #ifndef ALT_ASM_SRC
+        #include <stdarg.h>
+        #include "sys/alt_alarm.h"
+        #include "sys/alt_dev.h"
+        #ifdef __ALTERA_AVALON_JTAG_UART 
+            #include "altera_avalon_jtag_uart.h"
+        #endif
+    #endif /* ALT_ASM_SRC */
+
+    /* These are included for the port register offsets and masks, needed
+     * to write to the port.  Only include if the port type is set correctly,
+     * otherwise error.  If alt_log is turned on and the port to output to is
+     * incorrect or does not exist, then should exit. */
+    #if ALT_LOG_PORT_TYPE == ALTERA_AVALON_JTAG_UART 
+        #ifdef __ALTERA_AVALON_JTAG_UART
+            #include <altera_avalon_jtag_uart_regs.h>
+        #else
+            #error ALT_LOG: JTAG_UART port chosen, but no JTAG_UART in system. 
+        #endif
+    #elif ALT_LOG_PORT_TYPE == ALTERA_AVALON_UART 
+        #ifdef __ALTERA_AVALON_UART
+            #include <altera_avalon_uart_regs.h>
+        #else
+            #error ALT_LOG: UART Port chosen, but no UART in system.
+        #endif
+    #else
+        #error ALT_LOG: alt_log_port_type declaration invalid!
+    #endif
+
+    /* ALT_LOG_ENABLE turns on the basic printing function */
+    #define ALT_LOG_PRINTF(...) do {alt_log_printf_proc(__VA_ARGS__);} while (0)
+ 
+    /* Assembly macro for printing in assembly, calls tx_log_str
+     * which is in alt_log_macro.S.
+     * If alt_log_boot_on_flag is 0, skips the printing */
+    #define ALT_LOG_PUTS(str) movhi r4, %hiadj(alt_log_boot_on_flag) ; \
+         addi r4, r4, %lo(alt_log_boot_on_flag) ; \
+         ldwio r5, 0(r4) ; \
+         beq r0, r5, 0f ; \
+         movhi r4, %hiadj(str) ; \
+         addi r4, r4, %lo(str) ; \
+	 call tx_log_str ; \
+       0:
+    
+    /* These defines are here to faciliate the use of one output function 
+     * (alt_log_txchar) to print to both the JTAG UART or the UART. Depending
+     * on the port type, the status register, read mask, and output register 
+     * are set to the appropriate value for the port.  */
+    #if ALT_LOG_PORT_TYPE == ALTERA_AVALON_JTAG_UART 
+      #define ALT_LOG_PRINT_REG_RD IORD_ALTERA_AVALON_JTAG_UART_CONTROL
+      #define ALT_LOG_PRINT_MSK ALTERA_AVALON_JTAG_UART_CONTROL_WSPACE_MSK
+      #define ALT_LOG_PRINT_TXDATA_WR IOWR_ALTERA_AVALON_JTAG_UART_DATA
+      #define ALT_LOG_PRINT_REG_OFFSET (ALTERA_AVALON_JTAG_UART_CONTROL_REG*0x4)
+      #define ALT_LOG_PRINT_TXDATA_REG_OFFSET (ALTERA_AVALON_JTAG_UART_DATA_REG*0x4)
+    #elif ALT_LOG_PORT_TYPE == ALTERA_AVALON_UART 
+      #define ALT_LOG_PRINT_REG_RD IORD_ALTERA_AVALON_UART_STATUS
+      #define ALT_LOG_PRINT_MSK ALTERA_AVALON_UART_STATUS_TRDY_MSK
+      #define ALT_LOG_PRINT_TXDATA_WR IOWR_ALTERA_AVALON_UART_TXDATA
+      #define ALT_LOG_PRINT_REG_OFFSET (ALTERA_AVALON_UART_STATUS_REG*0x4)
+      #define ALT_LOG_PRINT_TXDATA_REG_OFFSET (ALTERA_AVALON_UART_TXDATA_REG*0x4)
+    #endif /* ALT_LOG_PORT */
+
+    /* Grouping of flags via ALT_LOG_FLAGS.  Each specific flag can be set via 
+     * -D at compile time, or else they'll be set to a default value according
+     * to ALT_LOG_FLAGS.  ALT_LOG_FLAGS = 0 or not set is the default, where 
+     * only the boot messages will be printed. As ALT_LOG_FLAGS increase, they
+     * increase in intrusiveness to the program, and will affect performance.
+     *
+     * Flag Level 1 - turns on system clock and JTAG UART startup status
+     *            2 - turns on write echo and JTAG_UART alarm (periodic report)
+     *            3 - turns on JTAG UART ISR logging - will slow performance
+     *                significantly. 
+     *           -1 - All logging output is off, but if ALT_LOG_ENABLE is 
+     *                defined all logging function is built and code size 
+     *                remains constant 
+     *
+     * Flag settings - 1 = on, 0 = off. */
+
+    /* This flag turns on "boot" messages for printing.  This includes messages
+     * during crt0.S, then alt_main, and finally alt_exit. */
+    #ifndef ALT_LOG_BOOT_ON_FLAG_SETTING
+        #if ALT_LOG_FLAGS == 1
+            #define ALT_LOG_BOOT_ON_FLAG_SETTING 0x1
+        #elif ALT_LOG_FLAGS == 2
+            #define ALT_LOG_BOOT_ON_FLAG_SETTING 0x1
+        #elif ALT_LOG_FLAGS == 3
+            #define ALT_LOG_BOOT_ON_FLAG_SETTING 0x1
+        #elif ALT_LOG_FLAGS == -1 /* silent mode */
+            #define ALT_LOG_BOOT_ON_FLAG_SETTING 0x0
+        #else /* default setting */
+            #define ALT_LOG_BOOT_ON_FLAG_SETTING 0x1
+        #endif
+    #endif /* ALT_LOG_BOOT_ON_FLAG_SETTING */
+
+    #ifndef ALT_LOG_SYS_CLK_ON_FLAG_SETTING
+        #if ALT_LOG_FLAGS == 1
+            #define ALT_LOG_SYS_CLK_ON_FLAG_SETTING 0x1
+        #elif ALT_LOG_FLAGS == 2
+            #define ALT_LOG_SYS_CLK_ON_FLAG_SETTING 0x1
+        #elif ALT_LOG_FLAGS == 3
+            #define ALT_LOG_SYS_CLK_ON_FLAG_SETTING 0x1
+        #elif ALT_LOG_FLAGS == -1 /* silent mode */ 
+            #define ALT_LOG_SYS_CLK_ON_FLAG_SETTING 0x0
+        #else /* default setting */
+            #define ALT_LOG_SYS_CLK_ON_FLAG_SETTING 0x0
+        #endif
+    #endif /* ALT_LOG_SYS_CLK_ON_FLAG_SETTING */
+
+    #ifndef ALT_LOG_WRITE_ON_FLAG_SETTING
+        #if ALT_LOG_FLAGS == 1
+            #define ALT_LOG_WRITE_ON_FLAG_SETTING 0x0
+        #elif ALT_LOG_FLAGS == 2
+            #define ALT_LOG_WRITE_ON_FLAG_SETTING 0x1
+        #elif ALT_LOG_FLAGS == 3
+            #define ALT_LOG_WRITE_ON_FLAG_SETTING 0x1
+        #elif ALT_LOG_FLAGS == -1 /* silent mode */
+            #define ALT_LOG_WRITE_ON_FLAG_SETTING 0x0
+        #else /* default setting */
+            #define ALT_LOG_WRITE_ON_FLAG_SETTING 0x0
+        #endif
+    #endif /* ALT_LOG_WRITE_ON_FLAG_SETTING */
+
+    #ifndef ALT_LOG_JTAG_UART_ALARM_ON_FLAG_SETTING
+        #ifndef __ALTERA_AVALON_JTAG_UART 
+            #define ALT_LOG_JTAG_UART_ALARM_ON_FLAG_SETTING 0x0
+        #elif ALT_LOG_FLAGS == 1
+            #define ALT_LOG_JTAG_UART_ALARM_ON_FLAG_SETTING 0x0
+        #elif ALT_LOG_FLAGS == 2
+            #define ALT_LOG_JTAG_UART_ALARM_ON_FLAG_SETTING 0x1
+        #elif ALT_LOG_FLAGS == 3
+            #define ALT_LOG_JTAG_UART_ALARM_ON_FLAG_SETTING 0x1
+        #elif ALT_LOG_FLAGS == -1 /* silent mode */
+            #define ALT_LOG_JTAG_UART_ALARM_ON_FLAG_SETTING 0x0
+        #else /* default setting */
+            #define ALT_LOG_JTAG_UART_ALARM_ON_FLAG_SETTING 0x0
+        #endif
+    #endif /* ALT_LOG_JTAG_UART_ALARM_ON_FLAG_SETTING */
+
+    #ifndef ALT_LOG_JTAG_UART_STARTUP_INFO_ON_FLAG_SETTING
+        #ifndef __ALTERA_AVALON_JTAG_UART 
+            #define ALT_LOG_JTAG_UART_STARTUP_INFO_ON_FLAG_SETTING 0x0
+        #elif ALT_LOG_FLAGS == 1
+            #define ALT_LOG_JTAG_UART_STARTUP_INFO_ON_FLAG_SETTING 0x1
+        #elif ALT_LOG_FLAGS == 2
+            #define ALT_LOG_JTAG_UART_STARTUP_INFO_ON_FLAG_SETTING 0x1
+        #elif ALT_LOG_FLAGS == 3
+            #define ALT_LOG_JTAG_UART_STARTUP_INFO_ON_FLAG_SETTING 0x1
+        #elif ALT_LOG_FLAGS == -1 /* silent mode */
+            #define ALT_LOG_JTAG_UART_STARTUP_INFO_ON_FLAG_SETTING 0x0
+        #else /* default setting */
+            #define ALT_LOG_JTAG_UART_STARTUP_INFO_ON_FLAG_SETTING 0x0
+        #endif
+    #endif /* ALT_LOG_JTAG_UART_STARTUP_INFO_FLAG_SETTING */
+
+    #ifndef ALT_LOG_JTAG_UART_ISR_ON_FLAG_SETTING
+        #ifndef __ALTERA_AVALON_JTAG_UART 
+            #define ALT_LOG_JTAG_UART_ISR_ON_FLAG_SETTING 0x0
+        #elif ALT_LOG_FLAGS == 1
+            #define ALT_LOG_JTAG_UART_ISR_ON_FLAG_SETTING 0x0
+        #elif ALT_LOG_FLAGS == 2
+            #define ALT_LOG_JTAG_UART_ISR_ON_FLAG_SETTING 0x0
+        #elif ALT_LOG_FLAGS == 3
+            #define ALT_LOG_JTAG_UART_ISR_ON_FLAG_SETTING 0x1
+        #elif ALT_LOG_FLAGS == -1 /* silent mode */
+            #define ALT_LOG_JTAG_UART_ISR_ON_FLAG_SETTING 0x0
+        #else /* default setting */
+            #define ALT_LOG_JTAG_UART_ISR_ON_FLAG_SETTING 0x0
+        #endif
+    #endif /* ALT_LOG_JTAG_UART_ISR_ON_FLAG_SETTING */
+
+#ifndef ALT_ASM_SRC
+    /* Function Prototypes */
+    void alt_log_txchar(int c,char *uartBase);
+    void alt_log_private_printf(const char *fmt,int base,va_list args);
+    void alt_log_repchar(char c,int r,int base);
+    int alt_log_printf_proc(const char *fmt, ... );
+    void alt_log_system_clock();
+    #ifdef __ALTERA_AVALON_JTAG_UART 
+        alt_u32 altera_avalon_jtag_uart_report_log(void * context);
+        void alt_log_jtag_uart_startup_info(altera_avalon_jtag_uart_state* dev, int base);
+        void alt_log_jtag_uart_print_control_reg(altera_avalon_jtag_uart_state* dev, \
+             int base, const char* header);
+        void alt_log_jtag_uart_isr_proc(int base, altera_avalon_jtag_uart_state* dev);
+    #endif
+    void alt_log_write(const void *ptr, size_t len);
+    
+    /* extern all global variables */
+    /* CASE:368514 - The boot message flag is linked into the sdata section
+     * because if it is zero, it would otherwise be placed in the bss section.
+     * alt_log examines this variable before the BSS is cleared in the boot-up
+     * process. 
+     */
+    extern volatile alt_u32 alt_log_boot_on_flag __attribute__ ((section (".sdata")));
+    extern volatile alt_u8 alt_log_write_on_flag;
+    extern volatile alt_u8 alt_log_sys_clk_on_flag;
+    extern volatile alt_u8 alt_log_jtag_uart_alarm_on_flag;
+    extern volatile alt_u8 alt_log_jtag_uart_isr_on_flag;
+    extern volatile alt_u8 alt_log_jtag_uart_startup_info_on_flag;
+    extern volatile int alt_log_sys_clk_count;
+    extern volatile int alt_system_clock_in_sec;
+    extern alt_alarm alt_log_jtag_uart_alarm_1;
+#endif  /* ALT_ASM_SRC */
+
+
+    /* Below are the MACRO defines used in various HAL files.  They check
+     * if their specific flag is turned on; if it is, then it executes its 
+     * code.
+     *
+     * To keep this file reasonable, most of these macros calls functions,
+     * which are defined in alt_log_printf.c.  Look there for implementation
+     * details. */
+  
+    /* Boot Messages Logging */
+    #define ALT_LOG_PRINT_BOOT(...) \
+       do { if (alt_log_boot_on_flag==1) {ALT_LOG_PRINTF(__VA_ARGS__);} \
+          } while (0)
+
+    /* JTAG UART Logging */
+    /* number of ticks before alarm runs logging function */
+    #ifndef ALT_LOG_JTAG_UART_TICKS_DIVISOR
+    	#define ALT_LOG_JTAG_UART_TICKS_DIVISOR 10
+    #endif
+    #ifndef ALT_LOG_JTAG_UART_TICKS
+        #define ALT_LOG_JTAG_UART_TICKS \
+        	(alt_ticks_per_second()/ALT_LOG_JTAG_UART_TICKS_DIVISOR)
+    #endif
+  
+    /* if there's a JTAG UART defined, then enable these macros */
+    #ifdef __ALTERA_AVALON_JTAG_UART 
+
+        /* Macro in altera_avalon_jtag_uart.c, to register the alarm function.
+         * Also, the startup register info is also printed here, as this is
+         * called within the device driver initialization.  */
+        #define ALT_LOG_JTAG_UART_ALARM_REGISTER(dev, base) \
+            do { if (alt_log_jtag_uart_alarm_on_flag==1) { \
+                    alt_alarm_start(&alt_log_jtag_uart_alarm_1, \
+                    ALT_LOG_JTAG_UART_TICKS, &altera_avalon_jtag_uart_report_log,\
+                    dev);} \
+                 if (alt_log_jtag_uart_startup_info_on_flag==1) {\
+                    alt_log_jtag_uart_startup_info(dev, base);} \
+               } while (0)
+  
+        /* JTAG UART IRQ Logging (when buffer is empty) 
+         * Inserted in the ISR in altera_avalon_jtag_uart.c */
+        #define ALT_LOG_JTAG_UART_ISR_FUNCTION(base, dev) \
+            do { alt_log_jtag_uart_isr_proc(base, dev); } while (0) 
+    /* else, define macros to nothing.  Or else the jtag_uart specific types
+     * will throw compiler errors */
+    #else
+        #define ALT_LOG_JTAG_UART_ALARM_REGISTER(dev, base) 
+        #define ALT_LOG_JTAG_UART_ISR_FUNCTION(base, dev) 
+    #endif
+
+    /* System clock logging
+     * How often (in seconds) the system clock logging prints.
+     * The default value is every 1 second */
+    #ifndef ALT_LOG_SYS_CLK_INTERVAL_MULTIPLIER
+	#define ALT_LOG_SYS_CLK_INTERVAL_MULTIPLIER 1
+    #endif
+    #ifndef ALT_LOG_SYS_CLK_INTERVAL
+	#define ALT_LOG_SYS_CLK_INTERVAL \
+	    (alt_ticks_per_second()*ALT_LOG_SYS_CLK_INTERVAL_MULTIPLIER)
+    #endif
+
+    /* System clock logging - prints a message every interval (set above) 
+     * to show that the system clock is alive. 
+     * This macro is used in altera_avalon_timer_sc.c */
+    #define ALT_LOG_SYS_CLK_HEARTBEAT() \
+    	do { alt_log_system_clock(); } while (0)
+
+    /* alt_write_logging - echos a message every time write() is called,
+     * displays the first ALT_LOG_WRITE_ECHO_LEN characters.
+     * This macro is used in alt_write.c */
+    #ifndef ALT_LOG_WRITE_ECHO_LEN
+        #define ALT_LOG_WRITE_ECHO_LEN 15
+    #endif
+
+    #define ALT_LOG_WRITE_FUNCTION(ptr,len) \
+        do { alt_log_write(ptr,len); } while (0)
+
+#else /* ALT_LOG_ENABLE not defined */
+
+    /* logging is off, set all relevant macros to null */
+    #define ALT_LOG_PRINT_BOOT(...)
+    #define ALT_LOG_PRINTF(...)
+    #define ALT_LOG_JTAG_UART_ISR_FUNCTION(base, dev) 
+    #define ALT_LOG_JTAG_UART_ALARM_REGISTER(dev, base) 
+    #define ALT_LOG_SYS_CLK_HEARTBEAT()
+    #define ALT_LOG_PUTS(str) 
+    #define ALT_LOG_WRITE_FUNCTION(ptr,len) 
+
+#endif /* ALT_LOG_ENABLE */
+
+#endif /* __ALT_LOG_PRINTF_H__ */
+

software/signal_processing_bsp/HAL/inc/sys/alt_set_args.h

+#ifndef __ALT_SET_ARGS_H__
+#define __ALT_SET_ARGS_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
+*                                                                             *
+******************************************************************************/
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+/*
+ * The function alt_set_args() is provided in order to define the input 
+ * arguments to main(). If this function is not called before main() then the
+ * argument list passed to main() will be empty.
+ *
+ * It is expected that this function will only be used by the ihost/iclient
+ * utility.
+ */
+
+static inline void alt_set_args (int argc, char** argv, char** envp)
+{
+  extern int    alt_argc;
+  extern char** alt_argv;
+  extern char** alt_envp;
+
+  alt_argc = argc;
+  alt_argv = argv;
+  alt_envp = envp;
+}
+
+#ifdef __cplusplus
+}
+#endif
+ 
+#endif /* __ALT_SET_ARGS_H__ */

software/signal_processing_bsp/HAL/inc/sys/alt_sim.h

+#ifndef __ALT_SIM_H__
+#define __ALT_SIM_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2007      Altera Corporation, San Jose, California, USA.      *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+#include "system.h"
+#include "alt_types.h"
+
+/* 
+ * Instructions that might mean something special to a simulator. 
+ * These have no special effect on real hardware (they are just nops).
+ */
+#define ALT_SIM_FAIL() \
+    do { __asm volatile ("cmpltui r0, r0, 0xabc1"); } while (0)
+
+#define ALT_SIM_PASS() \
+    do { __asm volatile ("cmpltui r0, r0, 0xabc2"); } while (0)
+
+#define ALT_SIM_IN_TOP_OF_HOT_LOOP() \
+    do { __asm volatile ("cmpltui r0, r0, 0xabc3"); } while (0)
+
+/*
+ * Routine called on exit.
+ */
+static ALT_INLINE ALT_ALWAYS_INLINE void alt_sim_halt(int exit_code)
+{
+  register int r2 asm ("r2") = exit_code;
+
+#if defined(NIOS2_HAS_DEBUG_STUB) && (defined(ALT_BREAK_ON_EXIT) || defined(ALT_PROVIDE_GMON))
+
+  register int r3 asm ("r3") = (1 << 2);
+
+#ifdef ALT_PROVIDE_GMON
+  extern unsigned int alt_gmon_data[];
+  register int r4 asm ("r4") = (int)alt_gmon_data;
+  r3 |= (1 << 4);
+#define ALT_GMON_DATA ,"r"(r4)
+#else
+#define ALT_GMON_DATA
+#endif /* ALT_PROVIDE_GMON */
+
+  if (r2) {
+    ALT_SIM_FAIL();
+  } else {
+    ALT_SIM_PASS();
+  }
+
+  __asm__ volatile ("\n0:\n\taddi %0,%0, -1\n\tbgt %0,zero,0b" : : "r" (ALT_CPU_FREQ/100) ); /* Delay for >30ms */
+
+  __asm__ volatile ("break 2" : : "r"(r2), "r"(r3) ALT_GMON_DATA );
+
+#else /* !DEBUG_STUB */
+  if (r2) {
+    ALT_SIM_FAIL();
+  } else {
+    ALT_SIM_PASS();
+  }
+#endif /* DEBUG_STUB */
+}
+
+#define ALT_SIM_HALT(exit_code) \
+  alt_sim_halt(exit_code)
+
+#endif /* __ALT_SIM_H__ */

software/signal_processing_bsp/HAL/inc/sys/alt_stack.h

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+
+#ifndef __ALT_STACK_H__
+#define __ALT_STACK_H__
+
+/*
+ * alt_stack.h is the nios2 specific implementation of functions used by the
+ * stack overflow code.
+ */
+
+#include "nios2.h"
+
+#include "alt_types.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+
+extern char * alt_stack_limit_value;
+
+#ifdef ALT_EXCEPTION_STACK
+extern char __alt_exception_stack_pointer[];  /* set by the linker */
+#endif /* ALT_EXCEPTION_STACK */
+
+
+/*
+ * alt_stack_limit can be called to determine the current value of the stack
+ * limit register.
+ */
+
+static ALT_INLINE char * ALT_ALWAYS_INLINE alt_stack_limit (void)
+{
+  char * limit;
+  NIOS2_READ_ET(limit);
+
+  return limit; 
+}
+
+/*
+ * alt_stack_pointer can be called to determine the current value of the stack
+ * pointer register.
+ */
+
+static ALT_INLINE char * ALT_ALWAYS_INLINE alt_stack_pointer (void)
+{
+  char * pointer;
+  NIOS2_READ_SP(pointer);
+
+  return pointer; 
+}
+
+
+#ifdef ALT_EXCEPTION_STACK
+
+/*
+ * alt_exception_stack_pointer returns the normal stack pointer from
+ * where it is stored on the exception stack (uppermost 4 bytes).  This
+ * is really only useful during exception processing, and is only
+ * available if a separate exception stack has been configured.
+ */
+
+static ALT_INLINE char * ALT_ALWAYS_INLINE alt_exception_stack_pointer (void)
+{
+  return (char *) *(alt_u32 *)(__alt_exception_stack_pointer - sizeof(alt_u32));
+}
+
+#endif /* ALT_EXCEPTION_STACK */
+
+
+/*
+ * alt_set_stack_limit can be called to update the current value of the stack
+ * limit register.
+ */
+
+static ALT_INLINE void ALT_ALWAYS_INLINE alt_set_stack_limit (char * limit)
+{
+  alt_stack_limit_value = limit;
+  NIOS2_WRITE_ET(limit);
+}
+
+/*
+ * alt_report_stack_overflow reports that a stack overflow happened.
+ */
+
+static ALT_INLINE void ALT_ALWAYS_INLINE alt_report_stack_overflow (void)
+{
+  NIOS2_REPORT_STACK_OVERFLOW();
+}
+
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __ALT_STACK_H__ */
+

software/signal_processing_bsp/HAL/inc/sys/alt_stdio.h

+#ifndef __ALT_STDIO_H__
+#define __ALT_STDIO_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2015 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
+*                                                                             *
+******************************************************************************/
+
+/*
+ * Definitions for ALT stdio routines.
+ */
+
+#include <stdarg.h>
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int alt_getchar();
+int alt_putchar(int c);
+int alt_putstr(const char* str);
+void alt_printf(const char *fmt, ...);
+#ifdef ALT_SEMIHOSTING
+int alt_putcharbuf(int c);
+int alt_putstrbuf(const char* str);
+int alt_putbufflush();
+#endif
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __ALT_STDIO_H__ */

software/signal_processing_bsp/HAL/inc/sys/alt_sys_init.h

+#ifndef __ALT_SYS_INIT_H__
+#define __ALT_SYS_INIT_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
+*                                                                             *
+******************************************************************************/
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+/*
+ * The function alt_sys_init() is defined within the auto-generated file:
+ * alt_sys_init.c. This function calls the initilisation macros for all
+ * devices, file systems, and software components within the system.
+ *
+ * The list of initilisation macros to use is constructed using the PTF and
+ * STF files associated with the system.
+ */
+
+extern void alt_sys_init (void);
+
+#ifdef __cplusplus
+}
+#endif
+ 
+#endif /* __ALT_SYS_INIT_H__ */

software/signal_processing_bsp/HAL/inc/sys/alt_sys_wrappers.h

+#ifndef __ALT_SYS_WRAPPERS_H__
+#define __ALT_SYS_WRAPPERS_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2003 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+
+/*
+ * This file provides the prototypes for the HAL 'UNIX style functions. The
+ * names of these functions are defined in alt_syscall.h. THese are defined to
+ * be the standard names when running the standalone HAL, e.g. open(), close()
+ * etc., but the names may be redefined as a part of an operating system port
+ * in order to avoid name clashes.
+ */
+
+#include "os/alt_syscall.h"
+
+#include <unistd.h>
+#include <sys/times.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/times.h>
+
+extern int     ALT_CLOSE (int __fd);
+extern int     ALT_EXECVE (const char *__path, 
+                           char * const __argv[], 
+                           char * const __envp[]);
+extern void    ALT_EXIT (int __status);
+extern int     ALT_FSTAT (int file, struct stat *st);
+extern int     ALT_FCNTL (int file, int cmd, ...);
+extern pid_t   ALT_FORK (void);
+extern pid_t   ALT_GETPID (void);
+
+#if defined (__GNUC__) && __GNUC__ >= 4
+extern int     ALT_GETTIMEOFDAY (struct timeval  *ptimeval, 
+                                 void *ptimezone);
+#else
+extern int     ALT_GETTIMEOFDAY (struct timeval  *ptimeval, 
+                                 struct timezone *ptimezone);
+#endif
+
+extern int     ALT_IOCTL (int file, int req, void* arg);
+extern int     ALT_ISATTY (int file);
+extern int     ALT_KILL (int pid, int sig);
+extern int     ALT_LINK (const char *existing, const char *new);
+extern off_t   ALT_LSEEK (int file, off_t ptr, int dir);
+extern int     ALT_OPEN (const char* file, int flags, ...);
+extern int     ALT_READ (int file, void *ptr, size_t len);
+extern int     ALT_RENAME (char *existing, char *new);
+extern void*   ALT_SBRK (ptrdiff_t incr);
+extern int     ALT_SETTIMEOFDAY (const struct timeval  *t,
+                                 const struct timezone *tz);
+extern int     ALT_STAT (const char *file, struct stat *st);
+extern clock_t ALT_TIMES (struct tms *buf);
+extern int     ALT_UNLINK (const char *name);
+
+#if defined (__GNUC__) && __GNUC__ >= 4
+int ALT_USLEEP (useconds_t us);
+#else
+unsigned int   ALT_USLEEP (unsigned int us);
+#endif
+
+extern int     ALT_WAIT (int *status);
+extern int     ALT_WRITE (int file, const void *ptr, size_t len);
+
+
+extern char** ALT_ENVIRON;
+
+/*
+ *
+ */
+
+#endif /* __ALT_SYS_WRAPPERS_H__ */

software/signal_processing_bsp/HAL/inc/sys/alt_timestamp.h

+#ifndef __ALT_TIMESTAMP_H__
+#define __ALT_TIMESTAMP_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
+*                                                                             *
+******************************************************************************/
+
+#include "alt_types.h"
+#include "altera_avalon_timer.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+extern int alt_timestamp_start (void);
+
+extern alt_timestamp_type alt_timestamp (void);
+
+extern alt_u32 alt_timestamp_freq (void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __ALT_TIMESTAMP_H__ */

software/signal_processing_bsp/HAL/inc/sys/alt_warning.h

+#ifndef __WARNING_H__
+#define __WARNING_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2003 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+
+/*
+ * alt_warning.h provides macro definitions that can be used to generate link 
+ * time warnings.
+ */ 
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+/*
+ * The symbol "__alt_invalid" is used to force a link error. There should be 
+ * no corresponding implementation of this function.
+ */  
+
+extern void __alt_invalid (void);
+
+#define ALT_LINK_WARNING(symbol, msg)                                                      \
+  __asm__(".ifndef __evoke_link_warning_" #symbol                                          \
+          "\n\t .section .gnu.warning." #symbol                                            \
+          "\n__evoke_link_warning_" #symbol ":\n\t .string \x22" msg "\x22 \n\t .previous" \
+          "\n .endif");
+
+/* A canned warning for sysdeps/stub functions.  */
+
+#define ALT_STUB_WARNING(name) \
+  ALT_LINK_WARNING (name, \
+    "warning: " #name " is not implemented and will always fail")
+
+#define ALT_OBSOLETE_FUNCTION_WARNING(name) \
+  ALT_LINK_WARNING (name, \
+    "warning: " #name " is a deprecated function")
+
+#define ALT_LINK_ERROR(msg) \
+  ALT_LINK_WARNING (__alt_invalid, msg); \
+  __alt_invalid()
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __WARNING_H__ */

software/signal_processing_bsp/HAL/inc/sys/ioctl.h

+#ifndef __IOCTL_H__
+#define __IOCTL_H__
+
+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
+*                                                                             *
+******************************************************************************/
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+/*
+ * The ioctl() system call be used to initiate a variety of control operations
+ * on a file descriptor. For the most part this simply translates to a call to
+ * the ioctl() function of the associated device driver (TIOCEXCL and
+ * TIOCNXCL are notable exceptions - see ioctl.c for details).
+ *
+ * The interpretation of the ioctl requests are therefore device specific.
+ *
+ * This function is equivalent to the standard Posix ioctl() call.
+ */
+
+extern int ioctl (int fd, int req, void* arg);
+
+/*
+ * list of ioctl calls handled by the system ioctl implementation.
+ */
+
+#define TIOCEXCL 0x740d /* exclusive use of the device */
+#define TIOCNXCL 0x740e /* allow multiple use of the device */
+
+/*
+ * ioctl calls which can be handled by device drivers.
+ */
+
+#define TIOCOUTQ 0x7472 /* get output queue size */
+#define TIOCMGET 0x741d /* get termios flags */
+#define TIOCMSET 0x741a /* set termios flags */
+
+/*
+ * ioctl calls specific to JTAG UART.
+ */
+
+#define TIOCSTIMEOUT 0x6a01 /* Set Timeout before assuming no host present */
+#define TIOCGCONNECTED 0x6a02 /* Get indication of whether host is connected */
+
+/*
+ *
+ */
+
+#ifdef __cplusplus
+}
+#endif
+  
+#endif /* __IOCTL_H__ */

software/signal_processing_bsp/HAL/inc/sys/termios.h

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT.                       *
+*                                                                             *
+******************************************************************************/
+
+/*
+ * This is the termios.h file provided with newlib. The only modification has 
+ * been to the baud rate macro definitions, and an increase in the size of the
+ * termios structure to accomodate this.
+ */
+
+
+#ifndef _SYS_TERMIOS_H
+# define _SYS_TERMIOS_H
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+# define _XCGETA (('x'<<8)|1)
+# define _XCSETA (('x'<<8)|2)
+# define _XCSETAW (('x'<<8)|3)
+# define _XCSETAF (('x'<<8)|4)
+# define _TCSBRK (('T'<<8)|5)
+# define _TCFLSH (('T'<<8)|7)
+# define _TCXONC (('T'<<8)|6)
+
+# define TCOOFF 0
+# define TCOON  1
+# define TCIOFF 2
+# define TCION  3
+
+# define TCIFLUSH 0
+# define TCOFLUSH 1
+# define TCIOFLUSH  2
+
+# define NCCS 13
+
+# define TCSAFLUSH  _XCSETAF
+# define TCSANOW  _XCSETA
+# define TCSADRAIN  _XCSETAW
+# define TCSADFLUSH _XCSETAF
+
+# define IGNBRK 000001
+# define BRKINT 000002
+# define IGNPAR 000004
+# define INPCK  000020
+# define ISTRIP 000040
+# define INLCR  000100
+# define IGNCR  000200
+# define ICRNL  000400
+# define IXON 002000
+# define IXOFF  010000
+
+# define OPOST  000001
+# define OCRNL  000004
+# define ONLCR  000010
+# define ONOCR  000020
+# define TAB3 014000
+
+# define CLOCAL 004000
+# define CREAD  000200
+# define CSIZE  000060
+# define CS5  0
+# define CS6  020
+# define CS7  040
+# define CS8  060
+# define CSTOPB 000100
+# define HUPCL  002000
+# define PARENB 000400
+# define PAODD  001000
+
+#define CCTS_OFLOW 010000
+#define CRTS_IFLOW 020000
+#define CRTSCTS (CCTS_OFLOW | CRTS_IFLOW)
+
+# define ECHO 0000010
+# define ECHOE  0000020
+# define ECHOK  0000040
+# define ECHONL 0000100
+# define ICANON 0000002
+# define IEXTEN 0000400 /* anybody know *what* this does?! */
+# define ISIG 0000001
+# define NOFLSH 0000200
+# define TOSTOP 0001000
+
+# define VEOF 4 /* also VMIN -- thanks, AT&T */
+# define VEOL 5 /* also VTIME -- thanks again */
+# define VERASE 2
+# define VINTR  0
+# define VKILL  3
+# define VMIN 4 /* also VEOF */
+# define VQUIT  1
+# define VSUSP  10
+# define VTIME  5 /* also VEOL */
+# define VSTART 11
+# define VSTOP  12
+
+# define B0 0
+# define B50  50
+# define B75  75
+# define B110 110
+# define B134 134
+# define B150 150
+# define B200 200
+# define B300 300
+# define B600 600
+# define B1200  1200
+# define B1800  1800
+# define B2400  2400
+# define B4800  4800
+# define B9600  9600
+# define B19200 19200
+# define B38400 38400
+# define B57600 57600
+# define B115200 115200
+
+typedef unsigned char cc_t;
+typedef unsigned short tcflag_t;
+typedef unsigned long speed_t;
+
+struct termios {
+  tcflag_t  c_iflag;
+  tcflag_t  c_oflag;
+  tcflag_t  c_cflag;
+  tcflag_t  c_lflag;
+  char      c_line;
+  cc_t      c_cc[NCCS];
+  speed_t   c_ispeed;
+  speed_t   c_ospeed;
+};
+
+# ifndef _NO_MACROS
+
+#  define cfgetospeed(tp) ((tp)->c_ospeed)
+#  define cfgetispeed(tp) ((tp)->c_ispeed)
+#  define cfsetospeed(tp,s) (((tp)->c_ospeed = (s)), 0)
+#  define cfsetispeed(tp,s) (((tp)->c_ispeed = (s)), 0)
+#  define tcdrain(fd)   _ioctl (fd, _TCSBRK, 1)
+# endif /* _NO_MACROS */
+
+#ifdef __cplusplus
+}
+#endif
+ 
+#endif  /* _SYS_TERMIOS_H */
+

software/signal_processing_bsp/HAL/src/alt_alarm_start.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2017,2004 Altera Corporation, San Jose, California, USA.      *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include <errno.h>
+
+#include "sys/alt_alarm.h"
+#include "sys/alt_irq.h"
+
+/*
+ * alt_alarm_start is called to register an alarm with the system. The 
+ * "alarm" structure passed as an input argument does not need to be 
+ * initialised by the user. This is done within this function.
+ *
+ * The remaining input arguments are:
+ *
+ * nticks - The time to elapse until the alarm executes. This is specified in
+ *          system clock ticks.
+ * callback - The function to run when the indicated time has elapsed.
+ * context  - An opaque value, passed to the callback function. 
+*
+ * Care should be taken when defining the callback function since it is 
+ * likely to execute in interrupt context. In particular, this mean that 
+ * library calls like printf() should not be made, since they can result in 
+ * deadlock.
+ *
+ * The interval to be used for the next callback is the return
+ * value from the callback function. A return value of zero indicates that the
+ * alarm should be unregistered. 
+ * 
+ * alt_alarm_start() will fail if  the timer facility has not been enabled 
+ * (i.e. there is no system clock). Failure is indicated by a negative return 
+ * value.
+ */ 
+
+int alt_alarm_start (alt_alarm* alarm, alt_u32 nticks,
+                     alt_u32 (*callback) (void* context),
+                     void* context)
+{
+  alt_irq_context irq_context;
+  alt_u64 current_nticks = 0;
+  
+  if (alt_ticks_per_second ())
+  {
+    if (alarm)
+    {
+      alarm->callback = callback;
+      alarm->context  = context;
+ 
+      irq_context = alt_irq_disable_all ();
+      
+      current_nticks = alt_nticks();
+      
+      alarm->time = (alt_u64)nticks + current_nticks + 1; 
+          
+      alt_llist_insert (&alt_alarm_list, &alarm->llist);
+      alt_irq_enable_all (irq_context);
+
+      return 0;
+    }
+    else
+    {
+      return -EINVAL;
+    }
+  }
+  else
+  {
+    return -ENOTSUP;
+  }
+}

software/signal_processing_bsp/HAL/src/alt_busy_sleep.c

+/*
+ * Copyright (c) 2003-2004 Altera Corporation, San Jose, California, USA.  
+ * All rights reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to 
+ * deal in the Software without restriction, including without limitation the 
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is 
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in 
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
+ * DEALINGS IN THE SOFTWARE.
+ * 
+ * ------------
+ *
+ * Altera does not recommend, suggest or require that this reference design 
+ * file be used in conjunction or combination with any other product.
+ *
+ * alt_busy_sleep.c - Microsecond delay routine which uses a calibrated busy
+ *                    loop to perform the delay. This is used to implement
+ *                    usleep for both uC/OS-II and the standalone HAL.  
+ *
+ * Author PRR
+ *
+ * Calibrated delay with no timer required
+ * 
+ * The ASM instructions in the routine are equivalent to 
+ *
+ * for (i=0;i<us*(ALT_CPU_FREQ/3);i++);
+ * 
+ * and takes three cycles each time around the loop
+ *
+ */
+
+#include <limits.h>
+#include <string.h>
+
+#include "system.h"
+#include "alt_types.h"
+
+#include "priv/alt_busy_sleep.h"
+
+unsigned int alt_busy_sleep (unsigned int us)
+{
+/*
+ * Only delay if ALT_SIM_OPTIMIZE is not defined; i.e., if software
+ * is built targetting ModelSim RTL simulation, the delay will be
+ * skipped to speed up simulation.
+ */
+#ifndef ALT_SIM_OPTIMIZE
+  int i;
+  int big_loops;
+  alt_u32 cycles_per_loop;
+  
+  if (!strcmp(NIOS2_CPU_IMPLEMENTATION,"tiny"))
+  {
+    cycles_per_loop = 9;
+  }
+  else  
+  {
+    cycles_per_loop = 3;
+  }
+  
+
+  big_loops = us / (INT_MAX/
+  (ALT_CPU_FREQ/(cycles_per_loop * 1000000)));
+
+  if (big_loops)
+  {
+    for(i=0;i<big_loops;i++)
+    {
+      /*
+      * Do NOT Try to single step the asm statement below 
+      * (single step will never return)
+      * Step out of this function or set a breakpoint after the asm statements
+      */
+      __asm__ volatile (
+        "\n0:"
+        "\n\taddi %0,%0, -1"
+        "\n\tbne %0,zero,0b"
+        "\n1:"
+        "\n\t.pushsection .debug_alt_sim_info"
+        "\n\t.int 4, 0, 0b, 1b"
+        "\n\t.popsection"
+        :: "r" (INT_MAX));
+      us -= (INT_MAX/(ALT_CPU_FREQ/
+      (cycles_per_loop * 1000000)));
+    }
+
+    /*
+    * Do NOT Try to single step the asm statement below 
+    * (single step will never return)
+    * Step out of this function or set a breakpoint after the asm statements
+    */
+    __asm__ volatile (
+      "\n0:"
+      "\n\taddi %0,%0, -1"
+      "\n\tbne %0,zero,0b"
+      "\n1:"
+      "\n\t.pushsection .debug_alt_sim_info"
+      "\n\t.int 4, 0, 0b, 1b"
+      "\n\t.popsection"
+      :: "r" (us*(ALT_CPU_FREQ/(cycles_per_loop * 1000000))));
+  }
+  else
+  {
+    /*
+    * Do NOT Try to single step the asm statement below 
+    * (single step will never return)
+    * Step out of this function or set a breakpoint after the asm statements
+    */
+    __asm__ volatile (
+      "\n0:"
+      "\n\taddi %0,%0, -1"
+      "\n\tbgt %0,zero,0b"
+      "\n1:"
+      "\n\t.pushsection .debug_alt_sim_info"
+      "\n\t.int 4, 0, 0b, 1b"
+      "\n\t.popsection"
+      :: "r" (us*(ALT_CPU_FREQ/(cycles_per_loop * 1000000))));
+  }
+#endif /* #ifndef ALT_SIM_OPTIMIZE */
+  return 0;
+}

software/signal_processing_bsp/HAL/src/alt_close.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include <unistd.h>
+
+#include "sys/alt_errno.h"
+#include "sys/alt_warning.h"
+#include "priv/alt_file.h"
+#include "os/alt_syscall.h"
+
+#ifdef ALT_USE_DIRECT_DRIVERS
+
+int ALT_CLOSE (int fildes)
+{
+  /* Generate a link time warning, should this function ever be called. */
+  
+  ALT_STUB_WARNING(close);
+  
+  /* Indicate an error */
+  
+  ALT_ERRNO = ENOSYS;
+  return -1;
+}
+
+#else /* !ALT_USE_DIRECT_DRIVERS */
+
+/*
+ * close() is called by an application to release a file descriptor. If the
+ * associated file system/device has a close() callback function registered 
+ * then this called. The file descriptor is then marked as free.
+ *
+ * ALT_CLOSE is mapped onto the close() system call in alt_syscall.h
+ */
+ 
+int ALT_CLOSE (int fildes)
+{
+  alt_fd* fd;
+  int     rval;
+
+  /*
+   * A common error case is that when the file descriptor was created, the call
+   * to open() failed resulting in a negative file descriptor. This is trapped
+   * below so that we don't try and process an invalid file descriptor.
+   */
+
+  fd = (fildes < 0) ? NULL : &alt_fd_list[fildes];
+
+  if (fd)
+  {
+    /*
+     * If the associated file system/device has a close function, call it so 
+     * that any necessary cleanup code can run.
+     */
+
+    rval = (fd->dev->close) ? fd->dev->close(fd) : 0;
+
+    /* Free the file descriptor structure and return. */
+
+    alt_release_fd (fildes);
+    if (rval < 0)
+    {
+      ALT_ERRNO = -rval;
+      return -1;
+    }
+    return 0;
+  }
+  else
+  {
+    ALT_ERRNO = EBADFD;
+    return -1;
+  }
+}
+
+#endif /* ALT_USE_DIRECT_DRIVERS */

software/signal_processing_bsp/HAL/src/alt_dcache_flush.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2003-2005 Altera Corporation, San Jose, California, USA.      *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+
+#include "nios2.h"
+#include "system.h"
+
+#include "alt_types.h"
+#include "sys/alt_cache.h" 
+
+#define ALT_FLUSH_DATA(i) __asm__ volatile ("flushda (%0)" :: "r" (i));
+
+/*
+ * alt_dcache_flush() is called to flush the data cache for a memory
+ * region of length "len" bytes, starting at address "start".
+ *
+ * Any dirty lines in the data cache are written back to memory.
+ */
+
+void alt_dcache_flush (void* start, alt_u32 len)
+{
+#if NIOS2_DCACHE_SIZE > 0
+
+  char* i;
+  char* end = ((char*) start) + len; 
+
+  for (i = start; i < end; i+= NIOS2_DCACHE_LINE_SIZE)
+  { 
+    ALT_FLUSH_DATA(i); 
+  }
+
+  /* 
+   * For an unaligned flush request, we've got one more line left.
+   * Note that this is dependent on NIOS2_DCACHE_LINE_SIZE to be a 
+   * multiple of 2 (which it always is).
+   */
+
+  if (((alt_u32) start) & (NIOS2_DCACHE_LINE_SIZE - 1))
+  {
+    ALT_FLUSH_DATA(i);
+  }
+
+#endif /* NIOS2_DCACHE_SIZE > 0 */
+}

software/signal_processing_bsp/HAL/src/alt_dcache_flush_all.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2003-2005 Altera Corporation, San Jose, California, USA.      *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+
+#include "nios2.h"
+#include "system.h"
+
+#include "alt_types.h"
+#include "sys/alt_cache.h" 
+
+/*
+ * alt_dcache_flush_all() is called to flush the entire data cache.
+ */
+
+void alt_dcache_flush_all (void)
+{
+#if NIOS2_DCACHE_SIZE > 0
+  char* i;
+  
+  for (i = (char*) 0; i < (char*) NIOS2_DCACHE_SIZE; i+= NIOS2_DCACHE_LINE_SIZE)
+  { 
+    __asm__ volatile ("flushd (%0)" :: "r" (i));
+  }
+#endif /* NIOS2_DCACHE_SIZE > 0 */
+}

software/signal_processing_bsp/HAL/src/alt_dcache_flush_no_writeback.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2007 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+
+#include "nios2.h"
+#include "system.h"
+
+#include "alt_types.h"
+#include "sys/alt_cache.h" 
+
+#define ALT_FLUSH_DATA_NO_WRITEBACK(i) \
+  __asm__ volatile ("initda (%0)" :: "r" (i));
+
+/*
+ * alt_dcache_flush_no_writeback() is called to flush the data cache for a
+ * memory region of length "len" bytes, starting at address "start".
+ *
+ * Any dirty lines in the data cache are NOT written back to memory.
+ * Make sure you really want this behavior.  If you aren't 100% sure,
+ * use the alt_dcache_flush() routine instead.
+ */
+
+void alt_dcache_flush_no_writeback (void* start, alt_u32 len)
+{
+  char* i;
+  char* end = ((char*) start) + len; 
+
+  for (i = start; i < end; i+= NIOS2_DCACHE_LINE_SIZE)
+  { 
+    ALT_FLUSH_DATA_NO_WRITEBACK(i); 
+  }
+
+  /* 
+   * For an unaligned flush request, we've got one more line left.
+   * Note that this is dependent on NIOS2_DCACHE_LINE_SIZE to be a 
+   * multiple of 2 (which it always is).
+   */
+
+  if (((alt_u32) start) & (NIOS2_DCACHE_LINE_SIZE - 1))
+  {
+    ALT_FLUSH_DATA_NO_WRITEBACK(i);
+  }
+}

software/signal_processing_bsp/HAL/src/alt_dev.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include <stddef.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include "sys/alt_dev.h"
+#include "priv/alt_file.h"
+
+#include "alt_types.h"
+
+#include "system.h"
+
+/*
+ * This file contains the data constructs used to control access to device and
+ * filesytems.
+ */
+
+/*
+ * "alt_fs_list" is the head of a linked list of registered filesystems. It is 
+ * initialised as an empty list. New entries can be added using the 
+ * alt_fs_reg() function.  
+ */
+
+ALT_LLIST_HEAD(alt_fs_list);
+
+
+/*
+ * "alt_dev_list" is the head of a linked list of registered devices. It is
+ * configured at startup to include a single device, "alt_dev_null". This
+ * device is discussed below.
+ */
+
+extern alt_dev alt_dev_null; /* forward declaration */
+
+alt_llist alt_dev_list = {&alt_dev_null.llist, &alt_dev_null.llist};
+
+/*
+ * alt_dev_null_write() is the implementation of the write() function used
+ * by the alt_dev_null device. It simple discards all data passed to it, and
+ * indicates that the data has been successfully transmitted.
+ */
+
+static int alt_dev_null_write (alt_fd* fd, const char* ptr, int len)
+{
+  return len;
+}
+
+/*
+ * "alt_dev_null" is used to allow output to be redirected to nowhere. It is
+ * the only device registered before the call to alt_sys_init(). At startup 
+ * stin, stdout & stderr are all directed towards this device so that library 
+ * calls like printf() will be safe but inefectual.  
+ */
+
+alt_dev alt_dev_null = {
+   {
+     &alt_dev_list,
+     &alt_dev_list
+   },
+   "/dev/null",
+   NULL,               /* open */
+   NULL,               /* close */
+   NULL,               /* write */
+   alt_dev_null_write, /* write */
+   NULL,               /* lseek */   
+   NULL,               /* fstat */ 
+   NULL                /* ioctl */
+ };
+
+/*
+ * "alt_fd_list_lock" is a semaphore used to control access to the file
+ * descriptor list. This is used to ensure that access to the list is thread
+ * safe.  
+ */
+
+ALT_SEM(alt_fd_list_lock)
+
+/*
+ * "alt_max_fd" is used to make access to the file descriptor list more 
+ * efficent. It is set to be the value of the highest allocated file 
+ * descriptor. This saves having to search the entire pool of unallocated
+ * file descriptors when looking for a match.
+ */
+
+alt_32 alt_max_fd = -1;
+
+/*
+ * "alt_fd_list" is the file descriptor pool. The first three entries in the
+ * array are configured as standard in, standard out, and standard error. These
+ * are all initialised so that accesses are directed to the alt_dev_null 
+ * device. The remaining file descriptors are initialised as unallocated.
+ *
+ * The maximum number of file descriptors within the system is specified by the
+ * user defined macro "ALT_MAX_FD". This is defined in "system.h", which is 
+ * auto-genereated using the projects PTF and STF files.
+ */
+
+alt_fd alt_fd_list[ALT_MAX_FD] = 
+  {
+    {
+      &alt_dev_null, /* standard in */
+      0,
+      0
+    },
+    {
+      &alt_dev_null, /* standard out */
+      0,
+      0
+    },
+    {
+      &alt_dev_null, /* standard error */
+      0,
+      0
+    }
+    /* all other elements are set to zero */
+  };

software/signal_processing_bsp/HAL/src/alt_dev_llist_insert.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include "priv/alt_dev_llist.h"
+#include "sys/alt_errno.h"
+
+/*
+ *
+ */
+
+int alt_dev_llist_insert (alt_dev_llist* dev, alt_llist* list)
+{
+  /*
+   * check that the device exists, and that it has a valid name.
+   */
+
+  if (!dev || !dev->name)
+  {
+    ALT_ERRNO = EINVAL;
+    return -EINVAL;
+  }
+  
+  /*
+   * register the device.
+   */
+  
+  alt_llist_insert(list, &dev->llist);
+
+  return 0;  
+}

software/signal_processing_bsp/HAL/src/alt_dma_rxchan_open.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include "sys/alt_dma.h"
+#include "sys/alt_errno.h"
+#include "priv/alt_file.h"
+
+/*
+ * The list of registered DMA receive channels.
+ */
+
+ALT_LLIST_HEAD(alt_dma_rxchan_list);
+
+/*
+ * alt_dma_txchan_open() is used to obtain an "alt_dma_txchan" descriptor for
+ * a DMA transmit device. The name is the name of the associated physical
+ * device (e.g. "/dev/dma_0").
+ *
+ * The return value will be NULL on failure, and non-NULL otherwise. 
+ */
+
+alt_dma_rxchan alt_dma_rxchan_open (const char* name)
+{
+  alt_dma_rxchan dev;
+
+  dev = (alt_dma_rxchan) alt_find_dev (name, &alt_dma_rxchan_list);
+
+  if (!dev)
+  {
+    ALT_ERRNO = ENODEV;
+  }
+
+  return dev;
+}

software/signal_processing_bsp/HAL/src/alt_dma_txchan_open.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include "sys/alt_dma.h"
+#include "sys/alt_errno.h"
+#include "priv/alt_file.h"
+
+/*
+ * The list of registered receive channels.
+ */
+
+ALT_LLIST_HEAD(alt_dma_txchan_list);
+
+/*
+ * alt_dma_txchan_open() is used to obtain an "alt_dma_txchan" descriptor for
+ * a DMA transmit device. The name is the name of the associated physical
+ * device (e.g. "/dev/dma_0").
+ *
+ * The return value will be NULL on failure, and non-NULL otherwise. 
+ */
+
+alt_dma_txchan alt_dma_txchan_open (const char* name)
+{
+  alt_dma_txchan dev;
+
+  dev = (alt_dma_txchan) alt_find_dev (name, &alt_dma_txchan_list);
+
+  if (!dev)
+  {
+    ALT_ERRNO = ENODEV;
+  }
+
+  return dev;
+}

software/signal_processing_bsp/HAL/src/alt_do_ctors.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT IT DIRECTLY.           *
+*                                                                             *
+* Overriding HAL Functions                                                    *
+*                                                                             *
+* To provide your own implementation of a HAL function, include the file in   *
+* your Nios II IDE application project. When building the executable, the     *
+* Nios II IDE finds your function first, and uses it in place of the HAL      *
+* version.                                                                    *
+*                                                                             *
+******************************************************************************/
+
+/*
+ * 
+ */
+
+typedef void (*constructor) (void);
+extern constructor __CTOR_LIST__[];
+extern constructor __CTOR_END__[];
+
+/*
+ * Run the C++ static constructors.
+ */
+
+void _do_ctors(void)
+{
+  constructor* ctor;
+
+  for (ctor = &__CTOR_END__[-1]; ctor >= __CTOR_LIST__; ctor--)
+        (*ctor) (); 
+}

software/signal_processing_bsp/HAL/src/alt_do_dtors.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* THIS IS A LIBRARY READ-ONLY SOURCE FILE. DO NOT EDIT IT DIRECTLY.           *
+*                                                                             *
+* Overriding HAL Functions                                                    *
+*                                                                             *
+* To provide your own implementation of a HAL function, include the file in   *
+* your Nios II IDE application project. When building the executable, the     *
+* Nios II IDE finds your function first, and uses it in place of the HAL      *
+* version.                                                                    *
+*                                                                             *
+******************************************************************************/
+
+/*
+ * 
+ */
+
+typedef void (*destructor) (void);
+extern destructor __DTOR_LIST__[];
+extern destructor __DTOR_END__[];
+
+/*
+ * Run the C++ static destructors.
+ */
+
+void _do_dtors(void)
+{
+  destructor* dtor;
+
+  for (dtor = &__DTOR_END__[-1]; dtor >= __DTOR_LIST__; dtor--)
+        (*dtor) (); 
+}

software/signal_processing_bsp/HAL/src/alt_ecc_fatal_entry.S

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2013 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+
+/*
+ * This is the code called at the beginning of the exception handler
+ * to detect a likely fatal ECC error exception and then jump to
+ * user-provided code to handle it.
+ *
+ * This code is pulled in from a .globl in alt_ecc_fatal_exception.c.
+ * This scheme is used so that if a handler is never registered, then this
+ * code will not appear in the generated executable, thereby improving 
+ * code footprint.
+ *
+ * This code is located in its own section that the linker script
+ * explicitly mentions and ensures it gets linked at the beginning
+ * of the exception handler.
+ */
+
+        /*
+         * Pull in the exception handler register save code.
+         */
+        .globl alt_exception
+
+        .section .exceptions.entry.ecc_fatal, "xa"
+
+        /*
+         * This might be handling an unrecoverable ECC error exception
+         * in the register file and/or data cache.
+         * Must avoid reading registers or performing load/store instructions
+         * before this is determined because they could trigger another 
+         * unrecoverable ECC error exception and create an infinite loop.
+         *
+         * The EXCEPTION register is always present when ECC is present.
+         * Bit 31 of this register indicates that there was an unrecoverable 
+         * ECC error exception in the register file and/or data cache.
+         * Test this (using blt to check sign bit) to determine if this is
+         * what we are dealing with.  Otherwise, just do normal processing.
+         *
+         * Jump to an application-provided routine to handle this condition.
+         * Pass in the return address in the et register in case this code
+         * can clean up the ECC error and then return here (unlikely).
+         *
+         * Runtime stack checking can't be enabled when ECC is present
+         * because they both want to use the et register.
+         */
+        rdctl et, exception
+        bge et, r0, alt_exception_not_ecc_fatal /* Not ECCFTL if bit 31 is 0 */
+
+        /*
+         * Load ECC fatal handler pointer into et register.
+         * Using a ldwio is safe because it completely bypasses the data cache.
+         */
+        movhi et, %hi(alt_exception_ecc_fatal_handler)
+        ori   et, et, %lo(alt_exception_ecc_fatal_handler) 
+        ldwio et, 0(et)
+ 
+        /* 
+         * If ECC fatal handler pointer is not 0, assume a handler
+         * has been provided by the application.
+         */
+        beq et, r0, alt_exception_not_ecc_fatal
+        
+        /*
+         * The et register contains the address of the ECC fatal handler.
+         * Jump to this address to invoke the handler.
+         */
+        jmp et
+
+        /*
+         * An ECC fatal handler can jump to this label if it able
+         * to recover from the fatal error (rare) and wants to continue
+         * with normal exception processing.
+         */
+.globl alt_exception_not_ecc_fatal
+alt_exception_not_ecc_fatal:

software/signal_processing_bsp/HAL/src/alt_ecc_fatal_exception.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2013 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+#include "io.h"
+#include "sys/alt_exceptions.h"
+#include "sys/alt_cache.h"
+
+/*
+ * This file implements support for calling a user-registered handler
+ * when a likely fatal ECC error exception occurs.
+ */
+
+/* 
+ * Global variable containing address to jump to when likely fatal
+ * ECC error exception occurs.
+ */
+alt_u32 alt_exception_ecc_fatal_handler = 0x0;
+
+/*
+ * Pull in the exception entry assembly code. This will not be linked in 
+ * unless this object is linked into the executable (i.e. only if 
+ * alt_ecc_fatal_exception_register() is called).
+ */
+__asm__( "\n\t.globl alt_exception" );
+
+/*
+ * alt_ecc_fatal_exception_register() is called to register a handler to
+ * service likely fatal ECC error exceptions. 
+ * 
+ * Passing null (0x0) in the handler argument will disable a previously-
+ * registered handler.
+ *
+ * Note that if no handler is registered, just normal exception processing
+ * occurs on a likely fatal ECC exception and the exception processing
+ * code might trigger an infinite exception loop.
+ */
+void 
+alt_ecc_fatal_exception_register(alt_u32 handler)
+{
+    alt_exception_ecc_fatal_handler = handler;
+
+    /* 
+     * Flush this from the cache. Required because the exception handler uses ldwio
+     * to read this value to avoid trigger another data cache ECC error exception.
+     */
+    alt_dcache_flush(&alt_exception_ecc_fatal_handler, sizeof(alt_exception_ecc_fatal_handler));
+}

software/signal_processing_bsp/HAL/src/alt_env_lock.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include <reent.h>
+
+/*
+ * These are the empty env lock/unlock stubs required by newlib. These are 
+ * used to make accesses to environment variables thread safe. The default HAL 
+ * configuration is single threaded, so there is nothing to do here. Note that 
+ * this requires that environment variables are never manipulated by an interrupt 
+ * service routine.
+ */
+
+void __env_lock ( struct _reent *_r )
+{
+}
+
+/*
+ *
+ */
+
+void __env_unlock ( struct _reent *_r )
+{
+}

software/signal_processing_bsp/HAL/src/alt_environ.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include "os/alt_syscall.h"
+
+/*
+ * These are the environment variables passed to the C code. By default there 
+ * are no variables registered. An application can manipulate this list using
+ * getenv() and setenv().
+ */
+
+char *__env[1] = { 0 };
+char **ALT_ENVIRON = __env;

software/signal_processing_bsp/HAL/src/alt_errno.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/*
+ * This file defines the alt_errno global variable. See comments in 
+ * alt_errno.h for the use of this variable.
+ */
+
+
+#include "sys/alt_errno.h"
+#include "alt_types.h"
+
+extern int ALT_WEAK *__errno (void);
+
+int* (*alt_errno) (void) = __errno;

software/signal_processing_bsp/HAL/src/alt_exception_entry.S

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2003-2008 Altera Corporation, San Jose, California, USA.      *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+
+#include "system.h"
+
+/*
+ * This is the exception entry point code, which saves all the caller saved
+ * registers and then handles the appropriate exception.  It should be pulled
+ * in using a .globl from all the exception handler routines.  This scheme is
+ * used so that if an interrupt is never registered, then this code will not
+ * appear in the generated executable, thereby improving code footprint.
+ *
+ * If an external interrpt controller (EIC) is present, it will supply an 
+ * interrupt vector address to the processor when an interrupt occurs. For 
+ * The Altera Vectored Interrupt Controller (VIC) driver will establish a 
+ * vector table and the processor will jump directly to the appropriate 
+ * table entry, funnel routine, and then user ISR. This will bypass this code 
+ * in entirety. This code might still be linked into a system with an EIC, 
+ * but would then be used only for non-interrupt exceptions.
+ */
+
+        /*
+         * Explicitly allow the use of r1 (the assembler temporary register)
+         * within this code. This register is normally reserved for the use of
+         * the assembler.
+         */
+        .set noat
+
+        /*
+         * The top and bottom of the exception stack.
+         */
+#ifdef ALT_EXCEPTION_STACK
+        .globl __alt_exception_stack_pointer
+
+#ifdef ALT_STACK_CHECK
+        .globl __alt_exception_stack_limit
+
+        /*
+         * Store the value of the stack limit after interrupt somewhere.
+         */
+        .globl  alt_exception_old_stack_limit
+#endif /* ALT_STACK_CHECK */
+#endif /* ALT_EXCEPTION_STACK */
+
+/* 
+ * The code at alt_exception is located at the Nios II exception
+ * handler address.
+ */
+        .section .exceptions.entry.label, "xa"
+        .globl alt_exception
+        .type alt_exception, @function
+alt_exception:
+
+        /*
+         * The code for detecting a likely fatal ECC exception is
+         * linked here before the normal exception handler code if required.
+         * This is handled by the linker script and putting that code
+         * in the .exceptions.entry.ecc_fatal section.
+         */
+
+        /*
+         * Now start the normal exception handler code.
+         */
+        .section .exceptions.entry, "xa"
+
+#ifdef ALT_EXCEPTION_STACK
+#ifdef ALT_STACK_CHECK
+        /* 
+         * When runtime stack checking is enabled, the et register
+         * contains the stack limit. Save this in memory before
+         * overwriting the et register.
+         */
+        stw   et, %gprel(alt_exception_old_stack_limit)(gp)
+#endif /* ALT_STACK_CHECK */
+
+        /* 
+         * Switch to the exception stack and save the current stack pointer
+         * in memory. Uses the et register as a scratch register.
+         */
+        movhi et, %hi(__alt_exception_stack_pointer - 80)
+        ori   et, et, %lo(__alt_exception_stack_pointer - 80) 
+        stw   sp, 76(et)
+        mov   sp, et
+
+#ifdef ALT_STACK_CHECK
+        /*
+         * Restore the stack limit from memory to the et register.
+         */
+        movhi et, %hi(__alt_exception_stack_limit)
+        ori   et, et, %lo(__alt_exception_stack_limit) 
+        stw   et, %gprel(alt_stack_limit_value)(gp)
+#endif /* ALT_STACK_CHECK */
+
+#else /* ALT_EXCEPTION_STACK disabled */
+        /* 
+         * Reserve space on normal stack for registers about to be pushed.
+         */
+        addi  sp, sp, -76
+
+#ifdef ALT_STACK_CHECK
+        /* Ensure stack didn't just overflow. */
+        bltu  sp, et, .Lstack_overflow
+#endif /* ALT_STACK_CHECK */
+
+#endif /* ALT_EXCEPTION_STACK */
+
+        /* 
+         * Process an exception.  For all exceptions we must preserve all
+         * caller saved registers on the stack (See the Nios II ABI
+         * documentation for details).
+         *
+         * Leave a gap in the stack frame at 4(sp) for the muldiv handler to
+         * store zero into.
+         */
+        stw   ra,  0(sp)
+        stw   r1,   8(sp)
+        stw   r2,  12(sp)
+        stw   r3,  16(sp)
+        stw   r4,  20(sp)
+        stw   r5,  24(sp)
+        stw   r6,  28(sp)
+        stw   r7,  32(sp)
+        rdctl r5, estatus   /* Read early to avoid usage stall */
+        stw   r8,  36(sp)
+        stw   r9,  40(sp)
+        stw   r10, 44(sp)
+        stw   r11, 48(sp)
+        stw   r12, 52(sp)
+        stw   r13, 56(sp)
+        stw   r14, 60(sp)
+        stw   r15, 64(sp)
+
+        /*
+         * ea-4 contains the address of the instruction being executed
+         * when the exception occured. For interrupt exceptions, we will
+         * will be re-issue the isntruction. Store it in 72(sp)
+         */
+        stw   r5,  68(sp)  /* estatus */
+        addi  r15, ea, -4  /* instruction that caused exception */
+        stw   r15,  72(sp)
+
+        /*
+         * The interrupt testing code (.exceptions.irqtest) will be
+         * linked here. If the Internal Interrupt Controller (IIC) is
+         * present (an EIC is not present), the presense of an interrupt
+         * is determined by examining CPU control registers or an interrupt
+         * custom instruction, if present. 
+         * 
+         * If the IIC is used and an interrupt is active, the code linked 
+         * here will call the HAL IRQ handler (alt_irq_handler()) which 
+         * successively calls registered interrupt handler(s) until no 
+         * interrupts remain pending. It then jumps to .exceptions.exit. If 
+         * there is no interrupt then it continues to .exception.notirq, below.
+         */
+
+        .section .exceptions.notirq, "xa"
+
+        /*
+         * Prepare to service unimplemtned instructions or traps,
+         * each of which is optionally inked into section .exceptions.soft,
+         * which will preceed .exceptions.unknown below.
+         *
+         * Unlike interrupts, we want to skip the exception-causing instructon
+         * upon completion, so we write ea (address of instruction *after*
+         * the one where the exception occured) into 72(sp). The actual
+         * instruction that caused the exception is written in r2, which these
+         * handlers will utilize.
+         */
+        stw ea, 72(sp) /* EA is PC+4 so will skip over instruction causing exception */
+
+#ifdef NIOS2_CDX_PRESENT
+        mov.n r4, ea            /* EA contains PC+4 of instruction that caused the exception */
+        subi.n r4, r4, 4        /* Calculate PC */
+        ldhu.n r2, 0(r4)        /* Load least-significant 16 bits of instruction */
+        andi r5, r2, 0x7        /* Mask off all bits except the 3 most-significant bits of OP field */
+
+        /*
+         * These instructions compare the MSB 3 bits of OP to 0x1, 0x3, and 0x5
+         * which is where all the 16-bit instructions live.
+         */
+        subi.n r5, r5, 1
+        beqz.n r5, .Lunknown_16bit
+        subi.n r5, r5, 2
+        beqz.n r5, .Lunknown_16bit
+        subi.n r5, r5, 2
+        beqz.n r5, .Lunknown_16bit
+
+.Lunknown_32bit:
+        stw ea, 72(sp) /* EA is PC+4 so will skip over instruction causing exception */
+
+        /* Load most-significant 16 bits of instruction */
+        ldhu.n r3, 2(r4)
+        slli.n r3, r3, 16
+        or.n r2, r2, r3 /* 32-bit instruction value that caused exception */
+        br.n .Lunknown_inst_loaded
+
+.Lunknown_16bit:
+        addi.n r4, r4, 2 /* Need PC+2 to skip over instruction causing exception */
+        stw r4, 72(sp)
+
+#else /* CDX is not Enabled and all instructions are 32bits */
+        ldw r2, -4(ea) /* Instruction value that caused exception */
+#endif
+
+.Lunknown_inst_loaded:
+
+        /*
+         * Other exception handling code, if enabled, will be linked here.
+         * This includes unimplemted (multiply/divide) instruction support
+         * (a BSP generaton option), and a trap handler (that would typically
+         * be augmented with user-specific code). These are not linked in by
+         * default.
+         */
+
+        /*
+         * In the context of linker sections, "unknown" are all exceptions
+         * not handled by the built-in handlers above (interupt, and trap or
+         * unimplemented instruction decoding, if enabled).
+         *
+         * Advanced exception types can be serviced by registering a handler.
+         * To do so, enable the "Enable Instruction-related Exception API" HAL
+         * BSP setting. If this setting is disabled, this handler code will
+         * either break (if the debug core is present) or enter an infinite
+         * loop because we don't how how to handle the exception.
+         */
+        .section .exceptions.unknown
+#ifdef ALT_INCLUDE_INSTRUCTION_RELATED_EXCEPTION_API
+        /*
+         * The C-based HAL routine alt_instruction_exception_entry() will
+         * attempt to service the exception by calling a user-registered
+         * exception handler using alt_instruction_exception_register().
+         * If no handler was registered it will either break (if the
+         * debugger is present) or go into an infinite loop since the
+         * handling behavior is undefined; in that case we will not return here.
+         */
+
+        /* Load exception-causing address as first argument (r4) */
+        addi   r4, ea, -4
+
+        /* Call the instruction-exception entry */
+        call   alt_instruction_exception_entry
+
+        /*
+         * If alt_instruction_exception_entry() returned, the exception was
+         * serviced by a user-registered routine. Its return code (now in r2)
+         * indicates whether to re-issue or skip the exception-causing
+         * instruction
+         *
+         * Return code was 0: Skip. The instruction after the exception is
+         * already stored in 72(sp).
+         */
+        bne   r2, r0, .Lexception_exit
+
+        /*
+         * Otherwise, modify 72(sp) to re-issue the instruction that caused the
+         * exception.
+         */
+        addi  r15, ea, -4  /* instruction that caused exception */
+        stw   r15,  72(sp)
+
+#else /* ALT_INCLUDE_INSTRUCTION_RELATED_EXCEPTION_API disabled */
+
+        /*
+         * We got here because an instruction-related exception occured, but the
+         * handler API was not compiled in. We do not presume to know how to
+         * handle it. If the debugger is present, break, otherwise hang.
+         *
+         *  If you get here then one of the following could have happened:
+         *
+         *  - An instruction-generated exception occured, and the processor
+         *    does not have the extra exceptions feature enabled, or you
+         *    have not registered a handler using
+         *    alt_instruction_exception_register()
+         *
+         *  Some examples of instruction-generated exceptions and why they
+         *  might occur:
+         *
+         *  - Your program could have been compiled for a full-featured
+         *    Nios II core, but it is running on a smaller core, and
+         *    instruction emulation has been disabled by defining
+         *    ALT_NO_INSTRUCTION_EMULATION.
+         *
+         *    You can work around the problem by re-enabling instruction
+         *    emulation, or you can figure out why your program is being
+         *    compiled for a system other than the one that it is running on.
+         *
+         *  - Your program has executed a trap instruction, but has not
+         *    implemented a handler for this instruction.
+         *
+         *  - Your program has executed an illegal instruction (one which is
+         *    not defined in the instruction set).
+         *
+         *  - Your processor includes an MMU or MPU, and you have enabled it
+         *    before registering an exception handler to service exceptions it
+         *    generates.
+         *
+         * The problem could also be hardware related:
+         *  - If your hardware is broken and is generating spurious interrupts
+         *    (a peripheral which negates its interrupt output before its
+         *    interrupt handler has been executed will cause spurious
+         *    interrupts)
+         */
+alt_exception_unknown:
+#ifdef NIOS2_HAS_DEBUG_STUB
+       /*
+        *  Either tell the user now (if there is a debugger attached) or go into
+        *  the debug monitor which will loop until a debugger is attached.
+        */
+        break
+#else /* NIOS2_HAS_DEBUG_STUB disabled */
+       /*
+        *  If there is no debug stub, an infinite loop is more useful.
+        */
+        br   alt_exception_unknown
+#endif /* NIOS2_HAS_DEBUG_STUB */
+#endif /* ALT_INCLUDE_INSTRUCTION_RELATED_EXCEPTION_API */
+
+        .section .exceptions.exit.label
+.Lexception_exit:
+
+        .section .exceptions.exit, "xa"
+
+        /* 
+         * Restore the saved registers, so that all general purpose registers 
+         * have been restored to their state at the time the interrupt occured.
+         */
+
+        ldw   r5,  68(sp)
+        ldw   ea,  72(sp)  /* This becomes the PC once eret is executed */
+        ldw   ra,   0(sp)
+
+        wrctl estatus, r5
+
+        ldw   r1,   8(sp)
+        ldw   r2,  12(sp)
+        ldw   r3,  16(sp)
+        ldw   r4,  20(sp)
+        ldw   r5,  24(sp)
+        ldw   r6,  28(sp)
+        ldw   r7,  32(sp)
+
+#if defined(ALT_EXCEPTION_STACK) && defined(ALT_STACK_CHECK)
+        ldw   et, %gprel(alt_exception_old_stack_limit)(gp)
+#endif
+
+        ldw   r8,  36(sp)
+        ldw   r9,  40(sp)
+        ldw   r10, 44(sp)
+        ldw   r11, 48(sp)
+        ldw   r12, 52(sp)
+        ldw   r13, 56(sp)
+        ldw   r14, 60(sp)
+        ldw   r15, 64(sp)
+
+#ifdef ALT_EXCEPTION_STACK
+#ifdef ALT_STACK_CHECK
+        stw   et, %gprel(alt_stack_limit_value)(gp)
+        stw   zero, %gprel(alt_exception_old_stack_limit)(gp)
+#endif /* ALT_STACK_CHECK */
+        ldw   sp,  76(sp)
+#else /* ALT_EXCEPTION_STACK disabled */
+        addi  sp, sp, 76
+#endif /* ALT_EXCEPTION_STACK */
+
+        /*
+         * Return to the interrupted instruction.
+         */
+
+        eret
+
+#ifdef ALT_STACK_CHECK
+.Lstack_overflow:
+        break 3
+#endif /* ALT_STACK_CHECK */
+

software/signal_processing_bsp/HAL/src/alt_exception_muldiv.S

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2003-2005 Altera Corporation, San Jose, California, USA.      *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+
+        /*
+         * This is the software multiply/divide handler for Nios2.
+         */ 
+
+        /*
+         * Provide a label which can be used to pull this file in.
+         */
+
+        .section .exceptions.start
+        .globl alt_exception_muldiv
+alt_exception_muldiv:
+
+        /*
+         * Pull in the entry/exit code.
+         */
+        .globl alt_exception
+
+
+        .section .exceptions.soft, "xa"
+
+
+        /* INSTRUCTION EMULATION
+        *  ---------------------
+        *
+        * Nios II processors generate exceptions for unimplemented instructions.
+        * The routines below emulate these instructions.  Depending on the
+        * processor core, the only instructions that might need to be emulated
+        * are div, divu, mul, muli, mulxss, mulxsu, and mulxuu.
+        *
+        * The emulations match the instructions, except for the following
+        * limitations:
+        *
+        * 1) The emulation routines do not emulate the use of the exception
+        *    temporary register (et) as a source operand because the exception
+        *    handler already has modified it.
+        *
+        * 2) The routines do not emulate the use of the stack pointer (sp) or the
+        *    exception return address register (ea) as a destination because
+        *    modifying these registers crashes the exception handler or the
+        *    interrupted routine.
+        *
+        * 3) To save code size, the routines do not emulate the use of the
+        *    breakpoint registers (ba and bt) as operands.
+        *
+        * Detailed Design
+        * ---------------
+        *
+        * The emulation routines expect the contents of integer registers r0-r31
+        * to be on the stack at addresses sp, 4(sp), 8(sp), ... 124(sp).  The
+        * routines retrieve source operands from the stack and modify the
+        * destination register's value on the stack prior to the end of the
+        * exception handler.  Then all registers except the destination register
+        * are restored to their previous values.
+        *
+        * The instruction that causes the exception is found at address -4(ea).
+        * The instruction's OP and OPX fields identify the operation to be
+        * performed.
+        *
+        * One instruction, muli, is an I-type instruction that is identified by
+        * an OP field of 0x24.
+        *
+        * muli   AAAAA,BBBBB,IIIIIIIIIIIIIIII,-0x24-
+        *           27    22                6      0    <-- LSB of field
+        *
+        * The remaining emulated instructions are R-type and have an OP field
+        * of 0x3a.  Their OPX fields identify them.
+        *
+        * R-type AAAAA,BBBBB,CCCCC,XXXXXX,NNNNN,-0x3a-
+        *           27    22    17     11     6      0  <-- LSB of field
+        * 
+        * 
+        */
+
+
+        /*
+         * Split the instruction into its fields.  We need 4*A, 4*B, and 4*C as
+         * offsets to the stack pointer for access to the stored register values.
+         */
+                             /* r2 = AAAAA,BBBBB,IIIIIIIIIIIIIIII,PPPPPP    */
+        roli  r3, r2, 7      /* r3 = BBB,IIIIIIIIIIIIIIII,PPPPPP,AAAAA,BB   */
+        roli  r4, r3, 3      /* r4 = IIIIIIIIIIIIIIII,PPPPPP,AAAAA,BBBBB    */
+        roli  r6, r4, 2      /* r6 = IIIIIIIIIIIIII,PPPPPP,AAAAA,BBBBB,II   */
+        srai  r4, r4, 16     /* r4 = (sign-extended) IMM16                  */
+        xori  r6, r6, 0x42   /* r6 = CCC,XXXXXX,NNNNN,PPPPPP,AAAAA,bBBBB,cC */
+        roli  r7, r6, 5      /* r7 = XXXX,NNNNN,PPPPPP,AAAAA,bBBBB,cCCCC,XX */
+        andi  r5, r2, 0x3f   /* r5 = 00000000000000000000000000,PPPPPP      */
+        xori  r3, r3, 0x40
+        andi  r3, r3, 0x7c   /* r3 = 0000000000000000000000000,aAAAA,00     */
+        andi  r6, r6, 0x7c   /* r6 = 0000000000000000000000000,bBBBB,00     */
+        andi  r7, r7, 0x7c   /* r7 = 0000000000000000000000000,cCCCC,00     */
+
+        /* Now either
+         *  r5 = OP
+         *  r3 = 4*(A^16)
+         *  r4 = IMM16 (sign extended)
+         *  r6 = 4*(B^16)
+         *  r7 = 4*(C^16)
+         * or
+         *  r5 = OP
+         */
+
+
+        /*
+         * Save everything on the stack to make it easy for the emulation routines
+         * to retrieve the source register operands.  The exception entry code has
+         * already saved some of this so we don't need to do it all again.
+         */
+
+        addi  sp, sp, -60
+        stw   zero, 64(sp)   /* Save zero on stack to avoid special case for r0. */
+                             /* Register at and r2-r15 have already been saved.  */
+
+        stw   r16,  0(sp)
+        stw   r17,  4(sp)
+        stw   r18,  8(sp)
+        stw   r19, 12(sp)
+        stw   r20, 16(sp)
+        stw   r21, 20(sp)
+        stw   r22, 24(sp)
+        stw   r23, 28(sp)
+                            /* et @ 32 - Has already been changed.*/
+                            /* bt @ 36 - Usually isn't an operand.   */
+        stw   gp,  40(sp)
+        stw   sp,  44(sp)
+        stw   fp,  48(sp)
+                            /* ea @ 52 - Don't bother to save - it's already been changed */
+                            /* ba @ 56 - Breakpoint register usually isn't an operand */
+                            /* ra @ 60 - Has already been saved */
+
+
+        /*
+         *  Prepare for either multiplication or division loop.
+         *  They both loop 32 times.
+         */
+        movi   r14, 32
+
+
+        /*
+         * Get the operands.
+         *
+         * It is necessary to check for muli because it uses an I-type instruction
+         * format, while the other instructions are have an R-type format.
+         */
+        add    r3, r3, sp     /* r3 = address of A-operand. */
+        ldw    r3, 0(r3)      /* r3 = A-operand. */
+        movi   r15, 0x24      /* muli opcode (I-type instruction format) */
+        beq    r5, r15, .Lmul_immed /* muli doesn't use the B register as a source */
+
+        add    r6, r6, sp     /* r6 = address of B-operand.               */
+        ldw    r6, 0(r6)      /* r6 = B-operand.                          */
+                              /* r4 = SSSSSSSSSSSSSSSS,-----IMM16------   */
+                              /* IMM16 not needed, align OPX portion      */
+                              /* r4 = SSSSSSSSSSSSSSSS,CCCCC,-OPX--,00000 */
+        srli   r4, r4, 5      /* r4 = 00000,SSSSSSSSSSSSSSSS,CCCCC,-OPX-- */
+        andi   r4, r4, 0x3f   /* r4 = 00000000000000000000000000,-OPX--   */
+
+        /* Now
+         * r5 = OP
+         * r3 = src1
+         * r6 = src2
+         * r4 = OPX (no longer can be muli)
+         * r7 = 4*(C^16)
+         * r14 = loop counter
+         */
+
+        /* ILLEGAL-INSTRUCTION EXCEPTION
+         *  -----------------------------
+         *
+         *  This code is for Nios II cores that generate exceptions when attempting
+         *  to execute illegal instructions.  Nios II cores that support an
+         *  illegal-instruction exception are identified by the presence of the
+         *  macro definition NIOS2_HAS_ILLEGAL_INSTRUCTION_EXCEPTION in system.h .
+         *
+         *  Remember that illegal instructions are different than unimplemented
+         *  instructions.  Illegal instructions are instruction encodings that
+         *  have not been defined by the Nios II ISA.  Unimplemented instructions
+         *  are legal instructions that must be emulated by some Nios II cores.
+         *
+         *  If we get here, all instructions except multiplies and divides
+         *  are illegal.
+         *
+         *  This code assumes that OP is not muli (because muli was tested above).
+         *  All other multiplies and divides are legal.  Anything else is illegal.
+         */
+
+        movi  r8, 0x3a                        /* OP for R-type mul* and div* */
+        bne   r5, r8, .Lnot_muldiv
+
+        /* r15 already is 0x24 */            /* OPX of divu */
+        beq   r4, r15, .Ldivide
+
+        movi  r15,0x27                        /* OPX of mul */
+        beq   r4, r15, .Lmultiply
+
+        movi  r15,0x07                        /* OPX of mulxuu */
+        beq   r4, r15, .Lmultiply
+
+        movi  r15,0x17                        /* OPX of mulxsu */
+        beq   r4, r15, .Lmultiply
+
+        movi  r15,0x1f                        /* OPX of mulxss */
+        beq   r4, r15, .Lmultiply
+
+        movi  r15,0x25                        /* OPX of div */
+        bne   r4, r15, .Lnot_muldiv
+
+
+        /* DIVISION
+         *
+         * Divide an unsigned dividend by an unsigned divisor using
+         * a shift-and-subtract algorithm.  The example below shows
+         * 43 div 7 = 6 for 8-bit integers.  This classic algorithm uses a
+         * single register to store both the dividend and the quotient,
+         * allowing both values to be shifted with a single instruction.
+         *
+         *                               remainder dividend:quotient
+         *                               --------- -----------------
+         *   initialize                   00000000     00101011:
+         *   shift                        00000000     0101011:_
+         *   remainder >= divisor? no     00000000     0101011:0
+         *   shift                        00000000     101011:0_
+         *   remainder >= divisor? no     00000000     101011:00
+         *   shift                        00000001     01011:00_
+         *   remainder >= divisor? no     00000001     01011:000
+         *   shift                        00000010     1011:000_
+         *   remainder >= divisor? no     00000010     1011:0000
+         *   shift                        00000101     011:0000_
+         *   remainder >= divisor? no     00000101     011:00000
+         *   shift                        00001010     11:00000_
+         *   remainder >= divisor? yes    00001010     11:000001
+         *       remainder -= divisor   - 00000111
+         *                              ----------
+         *                                00000011     11:000001
+         *   shift                        00000111     1:000001_
+         *   remainder >= divisor? yes    00000111     1:0000011
+         *       remainder -= divisor   - 00000111
+         *                              ----------
+         *                                00000000     1:0000011
+         *   shift                        00000001     :0000011_
+         *   remainder >= divisor? no     00000001     :00000110
+         *
+         * The quotient is 00000110.
+         */
+
+.Ldivide:
+        /*
+         *  Prepare for division by assuming the result
+         *  is unsigned, and storing its "sign" as 0.
+         */
+        movi   r17, 0
+
+
+        /* Which division opcode? */
+        xori   r15, r4, 0x25         /* OPX of div */
+        bne    r15, zero, .Lunsigned_division
+
+
+        /*
+         *  OPX is div.  Determine and store the sign of the quotient.
+         *  Then take the absolute value of both operands.
+         */
+        xor   r17, r3, r6      /* MSB contains sign of quotient */
+        bge   r3, zero, 0f
+        sub   r3, zero, r3     /* -r3 */
+0:
+        bge   r6, zero, 0f
+        sub   r6, zero, r6     /* -r6 */
+0:
+
+
+.Lunsigned_division:
+        /* Initialize the unsigned-division loop. */
+        movi  r13, 0          /* remainder = 0 */
+
+        /* Now
+        * r3 = dividend : quotient
+        * r4 = 0x25 for div, 0x24 for divu
+        * r6 = divisor
+        * r13 = remainder
+        * r14 = loop counter (already initialized to 32)
+        * r17 = MSB contains sign of quotient
+        */
+
+
+        /*
+        *   for (count = 32; count > 0; --count)
+        *   {
+        */
+.Ldivide_loop:
+
+        /*
+        *       Division:
+        *
+        *       (remainder:dividend:quotient) <<= 1;
+        */
+        slli  r13, r13, 1
+        cmplt r15, r3, zero        /* r15 = MSB of r3 */
+        or    r13, r13, r15
+        slli  r3, r3, 1
+
+
+        /*
+        *       if (remainder >= divisor)
+        *       {
+        *           set LSB of quotient
+        *           remainder -= divisor;
+        *       }
+        */
+        bltu  r13, r6, .Ldiv_skip
+        ori   r3, r3, 1
+        sub   r13, r13, r6
+.Ldiv_skip:
+
+        /*
+        *   }
+        */
+        subi  r14, r14, 1
+        bne   r14, zero, .Ldivide_loop
+
+        mov   r9, r3
+
+
+        /* Now
+        * r9 = quotient
+        * r4 = 0x25 for div, 0x24 for divu
+        * r7 = 4*(C^16)
+        * r17 = MSB contains sign of quotient
+        */
+
+    
+        /*
+        *  Conditionally negate signed quotient.  If quotient is unsigned,
+        *  the sign already is initialized to 0.
+        */
+        bge   r17, zero, .Lstore_result
+        sub   r9, zero, r9     /* -r9 */
+
+        br    .Lstore_result
+
+
+
+
+        /* MULTIPLICATION
+        *
+        * A "product" is the number that one gets by summing a "multiplicand"
+        * several times.  The "multiplier" specifies the number of copies of the
+        * multiplicand that are summed.
+        *
+        * Actual multiplication algorithms don't use repeated addition, however.
+        * Shift-and-add algorithms get the same answer as repeated addition, and
+        * they are faster.  To compute the lower half of a product (pppp below)
+        * one shifts the product left before adding in each of the partial products
+        * (a * mmmm) through (d * mmmm).
+        *
+        * To compute the upper half of a product (PPPP below), one adds in the
+        * partial products (d * mmmm) through (a * mmmm), each time following the
+        * add by a right shift of the product.
+        *
+        *     mmmm
+        *   * abcd
+        *   ------
+        *     ####  = d * mmmm
+        *    ####   = c * mmmm
+        *   ####    = b * mmmm
+        *  ####     = a * mmmm
+        * --------
+        * PPPPpppp
+        *
+        * The example above shows 4 partial products.  Computing actual Nios II
+        * products requires 32 partials.
+        *
+        * It is possible to compute the result of mulxsu from the result of mulxuu
+        * because the only difference between the results of these two opcodes is
+        * the value of the partial product associated with the sign bit of rA.
+        *
+        *   mulxsu = mulxuu - ((rA < 0) ? rB : 0);
+        *
+        * It is possible to compute the result of mulxss from the result of mulxsu
+        * because the only difference between the results of these two opcodes is
+        * the value of the partial product associated with the sign bit of rB.
+        *
+        *   mulxss = mulxsu - ((rB < 0) ? rA : 0);
+        *
+        */
+
+.Lmul_immed:
+        /* Opcode is muli.  Change it into mul for remainder of algorithm. */
+        mov   r7, r6         /* Field B is dest register, not field C. */
+        mov   r6, r4         /* Field IMM16 is src2, not field B. */
+        movi  r4, 0x27       /* OPX of mul is 0x27 */
+
+.Lmultiply:
+        /* Initialize the multiplication loop. */
+        movi  r9, 0          /* mul_product    = 0 */
+        movi  r10, 0         /* mulxuu_product = 0 */
+        mov   r11, r6        /* save original multiplier for mulxsu and mulxss */
+        mov   r12, r6        /* mulxuu_multiplier (will be shifted) */
+        movi  r16, 1         /* used to create "rori B,A,1" from "ror B,A,r16" */
+
+        /* Now
+        * r3 = multiplicand
+        * r6 = mul_multiplier
+        * r7 = 4 * dest_register (used later as offset to sp)
+        * r9 = mul_product
+        * r10 = mulxuu_product
+        * r11 = original multiplier
+        * r12 = mulxuu_multiplier
+        * r14 = loop counter (already initialized)
+        * r15 = temp
+        * r16 = 1
+        */
+
+
+        /*
+        *   for (count = 32; count > 0; --count)
+        *   {
+        */
+.Lmultiply_loop:
+
+        /*
+        *       mul_product <<= 1;
+        *       lsb = multiplier & 1;
+        */
+        slli   r9, r9, 1
+        andi   r15, r12, 1
+
+        /*
+        *       if (lsb == 1)
+        *       {
+        *           mulxuu_product += multiplicand;
+        *       }
+        */
+        beq   r15, zero, .Lmulx_skip
+        add   r10, r10, r3
+        cmpltu r15, r10, r3  /* Save the carry from the MSB of mulxuu_product. */
+        ror   r15, r15, r16  /* r15 = 0x80000000 on carry, or else 0x00000000 */
+.Lmulx_skip:
+
+        /*
+        *       if (MSB of mul_multiplier == 1)
+        *       {
+        *           mul_product += multiplicand;
+        *       }
+        */
+        bge   r6, zero, .Lmul_skip
+        add   r9, r9, r3
+.Lmul_skip:
+
+        /*
+        *       mulxuu_product >>= 1;           logical shift
+        *       mul_multiplier <<= 1;           done with MSB
+        *       mulx_multiplier >>= 1;          done with LSB
+        */
+        srli   r10, r10, 1
+        or     r10, r10, r15           /* OR in the saved carry bit. */
+        slli   r6, r6, 1
+        srli   r12, r12, 1
+
+
+        /*
+        *   }
+        */
+        subi   r14, r14, 1
+        bne    r14, zero, .Lmultiply_loop
+
+
+        /*
+        *  Multiply emulation loop done.
+        */
+
+        /* Now
+        * r3 = multiplicand
+        * r4 = OPX
+        * r7 = 4 * dest_register (used later as offset to sp)
+        * r9 = mul_product
+        * r10 = mulxuu_product
+        * r11 = original multiplier
+        * r15 = temp
+        */
+
+
+        /*
+        *  Select/compute the result based on OPX.
+        */
+
+
+        /* OPX == mul?  Then store. */
+        xori  r15, r4, 0x27
+        beq   r15, zero, .Lstore_result
+
+        /* It's one of the mulx.. opcodes.  Move over the result. */
+        mov   r9, r10
+
+        /* OPX == mulxuu?  Then store. */
+        xori  r15, r4, 0x07
+        beq   r15, zero, .Lstore_result
+
+        /* Compute mulxsu
+         *
+         * mulxsu = mulxuu - ((rA < 0) ? rB : 0);
+         */
+        bge   r3, zero, .Lmulxsu_skip
+        sub   r9, r9, r11
+.Lmulxsu_skip:
+
+        /* OPX == mulxsu?  Then store. */
+        xori  r15, r4, 0x17
+        beq   r15, zero, .Lstore_result
+
+        /* Compute mulxss
+         *
+         * mulxss = mulxsu - ((rB < 0) ? rA : 0);
+         */
+        bge   r11, zero, .Lmulxss_skip
+        sub   r9, r9, r3
+.Lmulxss_skip:
+        /* At this point, assume that OPX is mulxss, so store */
+
+
+.Lstore_result:
+        add   r7, r7, sp
+        stw   r9, 0(r7)
+
+        ldw   r16,  0(sp)
+        ldw   r17,  4(sp)
+        ldw   r18,  8(sp)
+        ldw   r19, 12(sp)
+        ldw   r20, 16(sp)
+        ldw   r21, 20(sp)
+        ldw   r22, 24(sp)
+        ldw   r23, 28(sp)
+
+                            /* bt @ 32 - Breakpoint register usually isn't an operand. */
+                            /* et @ 36 - Don't corrupt et. */
+                            /* gp @ 40 - Don't corrupt gp. */
+                            /* sp @ 44 - Don't corrupt sp. */
+        ldw   fp,  48(sp)
+                            /* ea @ 52 - Don't corrupt ea. */
+                            /* ba @ 56 - Breakpoint register usually isn't an operand. */
+
+        addi  sp, sp, 60
+
+        br    .Lexception_exit
+
+
+.Lnot_muldiv:
+
+        addi  sp, sp, 60
+
+
+        .section .exceptions.exit.label
+.Lexception_exit:
+

software/signal_processing_bsp/HAL/src/alt_exception_trap.S

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2003-2005 Altera Corporation, San Jose, California, USA.      *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+
+        /*
+         * This is the trap exception handler for Nios2.
+         */ 
+
+        /*
+         * Provide a label which can be used to pull this file in.
+         */
+
+        .section .exceptions.start
+        .globl alt_exception_trap
+alt_exception_trap:
+
+        /*
+         * Pull in the entry/exit code.
+         */
+        .globl alt_exception
+
+        .section .exceptions.soft, "xa"
+
+.Ltrap_handler:
+
+        /*
+         * Did a trap instruction cause the exception?
+         *
+         * The instruction which the exception occurred on has been loaded
+         * into r2 by code in alt_exception_entry.S
+         *
+         */
+
+#ifdef ALT_CPU_CPU_ARCH_NIOS2_R2
+        movhi r3,0xb41d              /* upper half of trap opcode */
+        ori   r3,r3,0x0020           /* lower half of trap opcode */
+        beq   r2,r3,.Lis_trap
+#ifdef NIOS2_CDX_PRESENT
+        mov   r3,r2
+        andhi r3,r3,0xffff
+        ori   r3,r3,0xd009           /* trap.n opcode */
+        beq   r2,r3,.Lis_trap
+#endif
+        br   .Lnot_trap
+#else
+        movhi r3,0x003b              /* upper half of trap opcode */
+        ori   r3,r3,0x683a           /* lower half of trap opcode */
+        bne   r2,r3,.Lnot_trap
+#endif
+
+.Lis_trap:
+        /*
+         *  There is no trap handler defined here, and so executing a trap
+         *  instruction causes a software break.  If you provide a trap handler,
+         *  then you must replace the break instruction below with your handler.
+         *  Your handler must preserve ea and the usual callee saved registers.
+         */
+
+        break
+
+        br   .Lexception_exit
+
+.Lnot_trap:
+
+
+        .section .exceptions.exit.label
+.Lexception_exit:
+
+

software/signal_processing_bsp/HAL/src/alt_execve.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include "sys/alt_errno.h"
+#include "sys/alt_warning.h"
+#include "os/alt_syscall.h"
+
+/*
+ * execve() is used by newlib to launch new processes. This is unsupported in
+ * the HAL environment. However a "do-nothing" implementation is still 
+ * provied for newlib compatability.
+ *
+ * ALT_EXECVE is mapped onto the execve() system call in alt_syscall.h
+ */
+ 
+int ALT_EXECVE (char *name, char ** argv, char** env)
+{
+  /* Generate a link time warning, should this function ever be called. */
+
+  ALT_STUB_WARNING(execve);
+
+  /* Indicate an error */
+
+  ALT_ERRNO = ENOSYS;
+  return -1;
+}

software/signal_processing_bsp/HAL/src/alt_exit.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include "sys/alt_irq.h"
+#include "sys/alt_sim.h"
+#include "os/alt_hooks.h"
+#include "os/alt_syscall.h"
+
+#include "alt_types.h"
+#include "sys/alt_log_printf.h"
+/*
+ * _exit() is called by exit() in order to terminate the current process. 
+ * Typically this is called when main() completes. It should never return. 
+ * Since there is nowhere to go once this process completes, this 
+ * implementation simply blocks forever.
+ *
+ * Note that interrupts are not disabled so that execution outside of this
+ * thread is allowed to continue. 
+ *
+ * ALT_EXIT is mapped onto the _exit() system call in alt_syscall.h
+ */
+
+void ALT_EXIT (int exit_code)
+{
+  /* ALT_LOG - please see HAL/inc/alt_log_printf.h for details */
+  ALT_LOG_PRINT_BOOT("[alt_exit.c] Entering _exit() function.\r\n");
+  ALT_LOG_PRINT_BOOT("[alt_exit.c] Exit code from main was %d.\r\n",exit_code);
+  /* Stop all other threads */
+
+  ALT_LOG_PRINT_BOOT("[alt_exit.c] Calling ALT_OS_STOP().\r\n");
+  ALT_OS_STOP();
+
+  /* Provide notification to the simulator that we've stopped */
+
+  ALT_LOG_PRINT_BOOT("[alt_exit.c] Calling ALT_SIM_HALT().\r\n");
+  ALT_SIM_HALT(exit_code);
+
+  /* spin forever, since there's no where to go back to */
+
+  ALT_LOG_PRINT_BOOT("[alt_exit.c] Spinning forever.\r\n");
+  while (1);
+}

software/signal_processing_bsp/HAL/src/alt_fcntl.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include <unistd.h>
+#include <fcntl.h>
+
+#include <stdio.h>
+#include <stdarg.h>
+
+#include "sys/alt_errno.h"
+#include "priv/alt_file.h"
+#include "alt_types.h"
+#include "os/alt_syscall.h"
+
+#define ALT_FCNTL_FLAGS_MASK ((alt_u32) (O_APPEND | O_NONBLOCK))
+
+/*
+ * fcntl() is a limited implementation of the standard fcntl() system call.
+ * It can be used to change the state of the flags associated with an open
+ * file descriptor. Normally these flags are set during the call to
+ * open(). It is anticipated that the main use of this function will be to
+ * change the state of a device from blocking to non-blocking (where this is
+ * supported). 
+ *
+ * The input argument "fd" is the file descriptor to be manipulated. "cmd"
+ * is the command to execute. This can be either F_GETFL (return the 
+ * current value of the flags) or F_SETFL (set the value of the flags).
+ *
+ * If "cmd" is F_SETFL then the argument "arg" is the new value of flags,
+ * otherwise "arg" is ignored. Only the flags: O_APPEND and O_NONBLOCK
+ * can be updated by a call to fcntl(). All other flags remain
+ * unchanged.
+ *
+ * ALT_FCNTL is mapped onto the fcntl() system call in alt_syscall.h
+ */
+ 
+int ALT_FCNTL (int file, int cmd, ...)
+{ 
+  alt_fd*  fd;
+  long     flags;
+  va_list  argp;
+
+  /*
+   * A common error case is that when the file descriptor was created, the call
+   * to open() failed resulting in a negative file descriptor. This is trapped
+   * below so that we don't try and process an invalid file descriptor.
+   */
+
+  fd = (file < 0) ? NULL : &alt_fd_list[file];
+  
+  if (fd)
+  {
+    switch (cmd)
+    {
+    case F_GETFL:
+      return fd->fd_flags & ~((alt_u32) ALT_FD_FLAGS_MASK);
+    case F_SETFL:
+      va_start(argp, cmd);
+      flags = va_arg(argp, long);
+      fd->fd_flags &= ~ALT_FCNTL_FLAGS_MASK;
+      fd->fd_flags |= (flags & ALT_FCNTL_FLAGS_MASK);
+      va_end(argp);
+      return 0;
+    default:
+      ALT_ERRNO = EINVAL;
+      return -1;
+    }
+  }
+
+  ALT_ERRNO = EBADFD;
+  return -1;
+}

software/signal_processing_bsp/HAL/src/alt_fd_lock.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include <errno.h>
+
+#include "priv/alt_file.h"
+
+/*
+ * alt_fd_lock() is called as a consequence of an ioctl call to gain exclusive
+ * access to a device, i.e.:
+ *
+ * ioctl (fd, TIOCEXCL, NULL);
+ *
+ * If there are no other open file descriptors which reference the same
+ * device, then alt_fd_lock() will grant the lock. Further calls to open() 
+ * for this device will fail until the lock is released.
+ *
+ * This is done by calling close() for this file descriptor, or by calling:
+ *
+ * ioctl (fd, TIOCNXCL, NULL);
+ *
+ * The return value is zero for success, or negative in the case of failure.
+ */
+
+int alt_fd_lock (alt_fd* fd)
+{
+  int i;
+  int rc = 0;
+
+  ALT_SEM_PEND(alt_fd_list_lock, 0);
+
+  for (i = 0; i < alt_max_fd; i++)
+  {
+    if ((&alt_fd_list[i] != fd) && (alt_fd_list[i].dev == fd->dev))
+    {
+      rc = -EACCES;
+      goto alt_fd_lock_exit;
+    }
+  }
+  fd->fd_flags |= ALT_FD_EXCL;
+
+ alt_fd_lock_exit:
+
+  ALT_SEM_POST(alt_fd_list_lock);
+  return rc;
+}

software/signal_processing_bsp/HAL/src/alt_fd_unlock.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include <errno.h>
+
+#include "priv/alt_file.h"
+
+/*
+ * alt_fd_unlock() is the inverse of alt_fd_lock(). It is called as a 
+ * consequence of a TIOCNXCL ioctl request, e.g:
+ *
+ * ioctl (fd, TIOCNXCL, NULL);
+ *
+ * It enables multiple file descriptors to exist for the same device. This
+ * is normally the case, but it may have been disabled by a previous call to
+ * alt_fd_lock().
+ *
+ * Return zero on sucess, and a negative value on failure.
+ *
+ * The current implementation always succeeds.
+ */
+
+int alt_fd_unlock (alt_fd* fd)
+{
+  fd->fd_flags &= ~ALT_FD_EXCL;
+  return 0;
+}

software/signal_processing_bsp/HAL/src/alt_find_dev.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "sys/alt_dev.h"
+#include "priv/alt_file.h"
+
+#include "alt_types.h"
+
+/* 
+ * alt_find_dev() is used by open() in order to locate a previously registered 
+ * device with the name "name". The input argument "llist" is a pointer to the
+ * head of the device list to search.
+ *
+ * The return value is a pointer to the matching device, or NULL if there is
+ * no match. 
+ *
+ * "name" must be an exact match for the devices registered name for a match to
+ * be found.
+ */
+ 
+alt_dev* alt_find_dev(const char* name, alt_llist* llist)
+{
+  alt_dev* next = (alt_dev*) llist->next;
+  alt_32 len;
+
+  len  = strlen(name) + 1;
+
+  /*
+   * Check each list entry in turn, until a match is found, or we reach the
+   * end of the list (i.e. next winds up pointing back to the list head).
+   */ 
+
+  while (next != (alt_dev*) llist)
+  {
+
+    /* 
+     * memcmp() is used here rather than strcmp() in order to reduce the size
+     * of the executable.
+     */
+
+    if (!memcmp (next->name, name, len))
+    {
+      /* match found */
+
+      return next;
+    }
+    next = (alt_dev*) next->llist.next;
+  }
+  
+  /* No match found */
+  
+  return NULL;
+}
+
+

software/signal_processing_bsp/HAL/src/alt_find_file.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "sys/alt_dev.h"
+#include "priv/alt_file.h"
+
+#include "alt_types.h"
+
+/* 
+ * alt_find_file() is used by open() in order to locate a previously registered 
+ * filesystem that owns that mount point that contains the file named "name". 
+ *
+ * The return value is a pointer to the matching filesystem, or NULL if there is
+ * no match. 
+ *
+ * A match is considered to have been found if the filesystem name followed by
+ * either '/' or '\0' is the prefix of the filename. For example the filename:
+ * "/myfilesystem/junk.txt" would match: "/myfilesystem", but not: "/myfile". 
+ */
+ 
+alt_dev* alt_find_file (const char* name)
+{
+  alt_dev* next = (alt_dev*) alt_fs_list.next;   
+
+  alt_32 len;
+ 
+  /*
+   * Check each list entry in turn, until a match is found, or we reach the
+   * end of the list (i.e. next winds up pointing back to the list head).
+   */ 
+ 
+  while (next != (alt_dev*) &alt_fs_list)
+  {
+    len = strlen(next->name);
+    
+    if (next->name[len-1] == '/')
+    {
+      len -= 1;
+    }
+
+    if (((name[len] == '/') || (name[len] == '\0')) && 
+        !memcmp (next->name, name, len))
+    {
+      /* match found */
+
+      return next;
+    }
+    next = (alt_dev*) next->llist.next;
+  }
+  
+  /* No match found */
+  
+  return NULL;     
+}
+
+

software/signal_processing_bsp/HAL/src/alt_flash_dev.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+/******************************************************************************
+*                                                                             *
+* Alt_flash.c - Functions to register a flash device to the "generic" flash   *
+*               interface                                                     *
+*                                                                             *
+* Author PRR                                                                  *
+*                                                                             *
+******************************************************************************/
+
+#include <errno.h>
+#include "sys/alt_llist.h"
+#include "sys/alt_flash_dev.h"
+#include "priv/alt_file.h"
+
+ALT_LLIST_HEAD(alt_flash_dev_list);
+
+alt_flash_fd* alt_flash_open_dev(const char* name)
+{
+  alt_flash_dev* dev = (alt_flash_dev*)alt_find_dev(name, &alt_flash_dev_list);
+
+  if ((dev) && dev->open)
+  {
+    return dev->open(dev, name);
+  }
+
+  return dev;
+}
+
+void alt_flash_close_dev(alt_flash_fd* fd)
+{
+  if (fd && fd->close)
+  {
+    fd->close(fd);
+  }
+  return;
+}
+

software/signal_processing_bsp/HAL/src/alt_fork.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include "sys/alt_warning.h"
+#include "sys/alt_errno.h"
+#include "os/alt_syscall.h"
+
+/*
+ * The fork() system call is used by newlib to create a duplicate copy of the
+ * curent process.  This is unsupported in the HAL environment. However a 
+ * "do-nothing" implementation is still provied for newlib compatability.
+ *
+ * ALT_FORK is mapped onto the fork() system call in alt_syscall.h
+ */
+ 
+int ALT_FORK (void)
+{
+  /* Generate a link time warning, should this function ever be called. */
+
+  ALT_STUB_WARNING(fork);
+
+ /* Indicate an error */
+
+  ALT_ERRNO = ENOSYS;
+  return -1;
+}
+
+ 

software/signal_processing_bsp/HAL/src/alt_fs_reg.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include <errno.h>
+
+#include "sys/alt_dev.h"
+#include "priv/alt_file.h"
+
+/*
+ * The alt_fs_reg() function is used to register a file system. Once registered 
+ * a device can be accessed using the standard posix calls: open(), read(), 
+ * write() etc.
+ *
+ * System behaviour is undefined in the event that a file system is registered 
+ * with a name that conflicts with an existing device or file system.
+ *
+ * alt_fs_reg() is not thread safe in the sense that there should be no other 
+ * thread using the file system list at the time that alt_dev_reg() is called. In
+ * practice this means that alt_fs_reg() should only be called while operating
+ * in a single threaded mode. The expectation is that it will only be called
+ * by the file system initilisation functions invoked by alt_sys_init(), which in 
+ * turn should only be called by the single threaded C startup code.   
+ *
+ * A return value of zero indicates success. A negative return value indicates
+ * failure. 
+ */
+ 
+int alt_fs_reg (alt_dev* dev)
+{
+  /*
+   * check that the device has a name.
+   */
+
+  if (!dev->name)
+  {
+    return -ENODEV;
+  }
+  
+  /*
+   * register the file system.
+   */
+
+  alt_llist_insert(&alt_fs_list, &dev->llist);
+
+  return 0;
+} 

software/signal_processing_bsp/HAL/src/alt_fstat.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2006 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include <stddef.h>
+#include <sys/stat.h>
+
+#include "sys/alt_dev.h"
+#include "sys/alt_warning.h"
+#include "sys/alt_errno.h"
+#include "priv/alt_file.h"
+#include "os/alt_syscall.h"
+
+/*
+ * The fstat() system call is used to obtain information about the capabilities
+ * of an open file descriptor. By default file descriptors are marked as 
+ * being character devices. If a device or file system wishes to advertise 
+ * alternative capabilities then they can register an fstat() function within
+ * their associated alt_dev structure. This will be called to fill in the
+ * entries in the imput "st" structure.
+ *
+ * This function is provided for compatability with newlib. 
+ *
+ * ALT_FSTAT is mapped onto the fstat() system call in alt_syscall.h
+ */
+
+#ifdef ALT_USE_DIRECT_DRIVERS
+
+#include "system.h"
+
+/*
+ * Provide minimal version that just describes all file descriptors 
+ * as character devices for provided stdio devices.
+ */
+int ALT_FSTAT (int file, struct stat *st)
+{
+    switch (file) {
+#ifdef ALT_STDIN_PRESENT
+    case 0: /* stdin file descriptor */
+#endif /* ALT_STDIN_PRESENT */
+#ifdef ALT_STDOUT_PRESENT
+    case 1: /* stdout file descriptor */
+#endif /* ALT_STDOUT_PRESENT */
+#ifdef ALT_STDERR_PRESENT
+    case 2: /* stderr file descriptor */
+#endif /* ALT_STDERR_PRESENT */
+        st->st_mode = _IFCHR;
+        return 0;
+    default:
+        return -1;
+    }
+
+#if !defined(ALT_STDIN_PRESENT) && !defined(ALT_STDOUT_PRESENT) && !defined(ALT_STDERR_PRESENT)
+    /* Generate a link time warning, should this function ever be called. */
+    ALT_STUB_WARNING(fstat);
+#endif
+}
+
+#else /* !ALT_USE_DIRECT_DRIVERS */
+
+int ALT_FSTAT (int file, struct stat *st)
+{
+  alt_fd*  fd;
+
+  /*
+   * A common error case is that when the file descriptor was created, the call
+   * to open() failed resulting in a negative file descriptor. This is trapped
+   * below so that we don't try and process an invalid file descriptor.
+   */
+
+  fd = (file < 0) ? NULL : &alt_fd_list[file];
+  
+  if (fd)
+  {
+    /* Call the drivers fstat() function to fill out the "st" structure. */
+
+    if (fd->dev->fstat)
+    {
+      return fd->dev->fstat(fd, st);
+    }
+
+    /* 
+     * If no function is provided, mark the fd as belonging to a character 
+     * device.
+     */
+ 
+    else
+    {
+      st->st_mode = _IFCHR;
+      return 0;
+    }
+  }
+  else
+  {
+    ALT_ERRNO = EBADFD;
+    return -1;
+  }
+}
+
+#endif /* ALT_USE_DIRECT_DRIVERS */

software/signal_processing_bsp/HAL/src/alt_get_fd.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include <stddef.h>
+#include <stdio.h>
+#include <errno.h>
+
+#include "sys/alt_dev.h"
+#include "priv/alt_file.h"
+
+#include "alt_types.h"
+
+#include "system.h"
+
+/*
+ * alt_get_fd() is called to allocate a new file descriptor from the file
+ * descriptor pool. If a file descriptor is succesfully allocated, it is 
+ * configured to refer to device "dev".
+ *
+ * The return value is the index of the file descriptor structure (i.e. 
+ * the offset of the file descriptor within the file descriptor array). A
+ * negative value indicates failure.
+ */
+
+int alt_get_fd (alt_dev* dev)
+{
+  alt_32 i;
+  int rc = -EMFILE;
+  
+  /* 
+   * Take the alt_fd_list_lock semaphore in order to avoid races when 
+   * accessing the file descriptor pool.
+   */
+  
+  ALT_SEM_PEND(alt_fd_list_lock, 0);
+  
+  /* 
+   * Search through the list of file descriptors, and allocate the first
+   * free descriptor that's found. 
+   *
+   * If a free descriptor is found, then the value of "alt_max_fd" is 
+   * updated accordingly. "alt_max_fd" is a 'highwater mark' which 
+   * indicates the highest file descriptor ever allocated. This is used to
+   * improve efficency when searching the file descriptor list, and 
+   * therefore reduce contention on the alt_fd_list_lock semaphore. 
+   */
+
+  for (i = 0; i < ALT_MAX_FD; i++)
+  {
+    if (!alt_fd_list[i].dev)
+    {
+      alt_fd_list[i].dev = dev;
+      if (i > alt_max_fd)
+      {
+        alt_max_fd = i;
+      }
+      rc = i;
+      goto alt_get_fd_exit;
+    }
+  }
+
+ alt_get_fd_exit:
+
+  /*
+   * Release the alt_fd_list_lock semaphore now that we are done with the
+   * file descriptor pool.
+   */
+
+  ALT_SEM_POST(alt_fd_list_lock);
+
+  return rc;
+}
+
+
+
+

software/signal_processing_bsp/HAL/src/alt_getchar.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2015 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include <stdio.h>
+
+#ifdef ALT_USE_DIRECT_DRIVERS
+#include "system.h"
+#include "sys/alt_driver.h"
+#include "sys/alt_stdio.h"
+#include "priv/alt_file.h"
+#include "unistd.h"
+#endif
+#ifdef ALT_SEMIHOSTING
+#include "sys/alt_stdio.h"
+#include "unistd.h"
+#endif
+/*
+ * Uses the ALT_DRIVER_READ() macro to call directly to driver if available.
+ * Otherwise, uses newlib provided getchar() routine.
+ */
+int 
+alt_getchar(void)
+{
+#ifdef ALT_SEMIHOSTING
+    char c;
+    read(STDIN_FILENO,&c,1);
+    return c;
+#else
+#ifdef ALT_USE_DIRECT_DRIVERS
+    ALT_DRIVER_READ_EXTERNS(ALT_STDIN_DEV);
+    char c;
+
+    if (ALT_DRIVER_READ(ALT_STDIN_DEV, &c, 1, alt_fd_list[STDIN_FILENO].fd_flags) <= 0) {
+        return -1;
+    }
+    return c;
+#else
+    return getchar();
+#endif
+#endif
+}

software/signal_processing_bsp/HAL/src/alt_getpid.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include "os/alt_syscall.h"
+
+/*
+ * The getpid() system call is used by newlib to obtain the current process 
+ * id. Since there is only ever a single process in the HAL environment,
+ * this just returns a constant. 
+ *
+ * ALT_GETPID is mapped onto the getpid() system call in alt_syscall.h
+ */
+ 
+int ALT_GETPID (void)
+{
+  return 0;
+}
+

software/signal_processing_bsp/HAL/src/alt_gettod.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2017,2004 Altera Corporation, San Jose, California, USA.      *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include <sys/time.h>
+#include <sys/times.h>
+#include <errno.h>
+
+#include "sys/alt_alarm.h"
+#include "alt_types.h"
+#include "os/alt_syscall.h"
+
+/*
+ * Macro defining the number of micoseconds in a second.
+ */
+
+#define ALT_US (1000000)
+
+/*
+ * "alt_timezone" and "alt_resettime" are the values of the the reset time and
+ * time zone set through the last call to settimeofday(). By default they are
+ * zero initialised.
+ */
+
+struct timezone alt_timezone = {0, 0};
+struct timeval  alt_resettime = {0, 0};
+
+/*
+ * gettimeofday() can be called to obtain a time structure which indicates the
+ * current "wall clock" time. This is calculated using the elapsed number of
+ * system clock ticks, and the value of "alt_resettime" and "alt_timezone" set
+ * through the last call to settimeofday().  
+ *
+ * Warning: if this function is called concurrently with a call to 
+ * settimeofday(), the value returned by gettimeofday() will be unreliable. 
+ *
+ * ALT_GETTIMEOFDAY is mapped onto the gettimeofday() system call in 
+ * alt_syscall.h
+ */
+ 
+
+#if defined (__GNUC__) && (__GNUC__ >= 4)
+int ALT_GETTIMEOFDAY (struct timeval  *ptimeval, void *ptimezone_vptr)
+{
+  struct timezone *ptimezone = (struct timezone*)ptimezone_vptr;
+#else
+int ALT_GETTIMEOFDAY (struct timeval  *ptimeval, struct timezone *ptimezone)
+{
+#endif
+  
+  alt_u64 nticks = alt_nticks (); 
+  alt_u32 tick_rate = alt_ticks_per_second ();
+
+  /* 
+   * Check to see if the system clock is running. This is indicated by a 
+   * non-zero system clock rate. If the system clock is not running, an error
+   * is generated and the contents of "ptimeval" and "ptimezone" are not
+   * updated.
+   */
+
+  if (tick_rate)
+  {
+    ptimeval->tv_sec  = alt_resettime.tv_sec  + nticks/tick_rate;
+    ptimeval->tv_usec = alt_resettime.tv_usec +
+     (alt_u32)((nticks*(ALT_US/tick_rate))%ALT_US);
+      
+    while(ptimeval->tv_usec < 0) {
+      if (ptimeval->tv_sec <= 0)
+      {
+          ptimeval->tv_sec = 0;
+          ptimeval->tv_usec = 0;
+          break;
+      }
+      else
+      {
+          ptimeval->tv_sec--;
+          ptimeval->tv_usec += ALT_US;
+      }
+    }
+    
+    while(ptimeval->tv_usec >= ALT_US) {
+      ptimeval->tv_sec++;
+      ptimeval->tv_usec -= ALT_US;
+    }
+      
+    if (ptimezone)
+    { 
+      ptimezone->tz_minuteswest = alt_timezone.tz_minuteswest;
+      ptimezone->tz_dsttime     = alt_timezone.tz_dsttime;
+    }
+
+    return 0;
+  }
+
+  return -ENOTSUP;
+}
+

software/signal_processing_bsp/HAL/src/alt_gmon.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2003-2005 Altera Corporation, San Jose, California, USA.      *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+
+#include <assert.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "priv/nios2_gmon_data.h"
+
+#include "sys/alt_irq.h"
+#include "sys/alt_alarm.h"
+
+
+/* Macros */
+
+/* How large should the bins be which we use to generate the histogram */
+#define PCSAMPLE_BYTES_PER_BUCKET 32
+
+#define NIOS2_READ_EA(dest)  __asm__ ("mov %0, ea" : "=r" (dest))
+
+/* The compiler inserts calls to mcount() at the start of
+ * every function call. The structure mcount_fn_arc records t
+ * he return address of the function called (in from_pc)
+ * and the return address of the mcount function
+ * (in self_pc). The number of times this arc is executed is
+ * recorded in the field count.
+ */
+struct mcount_fn_arc
+{
+  struct mcount_fn_arc * next;
+  void * from_pc;
+  unsigned int count;
+};
+
+/* We need to maintain a list of pointers to the heads of each adjacency
+ * list so that we can find them when writing out the gmon.out file. Since
+ * we don't know at the start of program execution how many functions will
+ * be called we use a list structure to do this.
+ */
+struct mcount_fn_entry
+{
+  struct mcount_fn_entry * next;
+  void * self_pc;
+  struct mcount_fn_arc * arc_head;
+};
+
+/* function prototypes */
+
+void __mcount_record(void * self_pc, void * from_pc, struct mcount_fn_entry * fn_entry, struct mcount_fn_entry * * fn_head) __attribute__ ((no_instrument_function));
+
+static __inline__ void * mcount_allocate(unsigned int size) __attribute__ ((no_instrument_function));
+static int nios2_pcsample_init(void) __attribute__ ((no_instrument_function));
+static alt_u32 nios2_pcsample(void* alarm) __attribute__ ((no_instrument_function));
+
+/* global variables */
+
+/* stext and etext are defined in the linker script */
+extern char stext[];
+extern char etext[];
+
+/* Is the PC sampling stuff enabled yet? */
+static int pcsample_need_init = 1;
+
+#define HASH_BUCKETS 64 /* Must be a power of 2 */
+
+/* This points to the list of adjacency list pointers. */
+struct mcount_fn_entry * __mcount_fn_head[HASH_BUCKETS];
+
+/* pointer to the in-memory buffer containing the histogram */
+static unsigned short* s_pcsamples = 0;
+
+/* the address of the start and end of text section */
+static const unsigned int s_low_pc  = (unsigned int)stext;
+static const unsigned int s_high_pc = (unsigned int)etext;
+
+/* the alarm structure to register for pc sampling */
+static alt_alarm s_nios2_pcsample_alarm;
+
+unsigned int alt_gmon_data[GMON_DATA_SIZE] =
+{
+  0x6e6f6d67, /* "gmon" */
+  GMON_DATA_SIZE,
+  0,
+  (unsigned int)stext,
+  (unsigned int)etext,
+  PCSAMPLE_BYTES_PER_BUCKET,
+  0,
+  (unsigned int)__mcount_fn_head,
+  (unsigned int)(__mcount_fn_head + HASH_BUCKETS)
+};
+
+/* This holds the current slab of memory we're allocating out of */
+static char * mcount_slab_ptr = 0;
+static int    mcount_slab_size = 0;
+
+#define MCOUNT_SLAB_INCREMENT 1020
+
+
+/*
+ * We can't use malloc to allocate memory because that's too complicated, and
+ * can't be called at interrupt time.  Use the lower level allocator instead
+ * because that's interrupt safe (and because we never free anything).
+ *
+ * For speed, we allocate a block of data at once.
+ */
+static __inline__ void * mcount_allocate(unsigned int size)
+{
+  void * data;
+
+  if (size > mcount_slab_size)
+  {
+    mcount_slab_ptr = sbrk(MCOUNT_SLAB_INCREMENT);
+    mcount_slab_size = MCOUNT_SLAB_INCREMENT;
+  }
+
+  data = mcount_slab_ptr;
+  mcount_slab_ptr += size;
+  mcount_slab_size -= size;
+
+  return data;
+}
+
+
+/*
+ * Add the arc with the values of frompc and topc given to the graph.
+ * This function might be called at interrupt time so must be able to
+ * cope with reentrancy.
+ *
+ * The fast case, where we have already allocated a function arc, has been
+ * handled by the assmebler code.
+ */
+void __mcount_record(void * self_pc, void * from_pc, struct mcount_fn_entry * fn_entry, struct mcount_fn_entry * * fn_head)
+{
+  alt_irq_context context;
+  struct mcount_fn_arc * arc_entry;
+
+  /* Keep trying to start up the PC sampler until it is running.
+   * (It can't start until the timer is going).
+   */
+  if (pcsample_need_init)
+  {
+    pcsample_need_init = 0;
+    pcsample_need_init = nios2_pcsample_init();
+  }
+
+  /*
+   * We must disable interrupts around the allocation and the list update to
+   * prevent corruption if the instrumented function is re-entrant.
+   *
+   * It's safe for the code above to be stepping through the chain and be
+   * interrupted by this code modifying it - there is an edge case which will
+   * leave two copies of the same arc on the list (both with count=1), but
+   * this is dealt with on the host.
+   */
+  context = alt_irq_disable_all();
+
+  if (fn_entry == NULL)
+  {
+    /* Add it to the list of functions we must output later. */
+    fn_entry = (struct mcount_fn_entry *)mcount_allocate(sizeof(struct mcount_fn_entry));
+
+    fn_entry->self_pc = self_pc;
+    fn_entry->arc_head = NULL;
+
+    fn_entry->next = *fn_head;
+    *fn_head = fn_entry;
+  }
+
+  /* We will need a new list entry - if there was a list entry before
+   * then the assembler code would have handled it. */
+  arc_entry = (struct mcount_fn_arc *)mcount_allocate(sizeof(struct mcount_fn_arc));
+
+  arc_entry->from_pc = from_pc;
+  arc_entry->count = 1;
+
+  arc_entry->next = fn_entry->arc_head;
+  fn_entry->arc_head = arc_entry;
+
+  alt_irq_enable_all(context);
+}
+
+
+/*
+ * nios2_pcsample_init starts profiling.
+ * It is called the first time mcount is called, and on subsequent calls to
+ * mcount until it returns zero. It initializes the pc histogram and turns on
+ * timer driven pc sampling.
+ */
+static int nios2_pcsample_init(void)
+{
+  unsigned int pcsamples_size; 
+
+  /* We sample the PC every tick */
+  unsigned int prof_rate = alt_ticks_per_second();
+  if (prof_rate == 0)
+    return 1;
+
+  /* allocate the histogram buffer s_pcsamples */
+  pcsamples_size = (s_high_pc - s_low_pc)/PCSAMPLE_BYTES_PER_BUCKET;
+  s_pcsamples    = (unsigned short*)sbrk(pcsamples_size * sizeof(unsigned short));
+
+  if (s_pcsamples != 0)
+  {
+    /* initialize the buffer to zero */
+    memset(s_pcsamples, 0, pcsamples_size * sizeof(unsigned short));
+
+    alt_gmon_data[GMON_DATA_PROFILE_DATA] = (int)s_pcsamples;
+    alt_gmon_data[GMON_DATA_PROFILE_RATE] = prof_rate;
+
+    /* Sample every tick (it's cheap) */
+    alt_alarm_start(&s_nios2_pcsample_alarm, 1, nios2_pcsample, 0);
+  }
+
+  return 0;
+}
+
+
+/*
+ * Sample the PC value and store it in the histogram
+ */
+static alt_u32 nios2_pcsample(void* context)
+{
+  unsigned int pc=0;
+  unsigned int bucket;
+
+  /* read the exception return address - this will be
+   * inaccurate if there are nested interrupts but we
+   * assume that this is rare and the inaccuracy will
+   * not be great */
+  NIOS2_READ_EA(pc);
+
+  /*
+   * If we're within the profilable range then increment the relevant
+   * bucket in the histogram
+   */
+  if (pc >= s_low_pc && pc < s_high_pc && s_pcsamples != 0)
+  {
+    bucket = (pc - s_low_pc)/PCSAMPLE_BYTES_PER_BUCKET;
+    s_pcsamples[bucket]++;
+  }
+
+  /* Sample every tick */
+  return 1;
+}
+

software/signal_processing_bsp/HAL/src/alt_icache_flush.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2003 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+
+#include "nios2.h"
+#include "system.h"
+
+#include "alt_types.h"
+#include "sys/alt_cache.h" 
+
+/*
+ * alt_icache_flush() is called to flush the instruction cache for a memory
+ * region of length "len" bytes, starting at address "start".
+ */
+
+void alt_icache_flush (void* start, alt_u32 len)
+{
+#if NIOS2_ICACHE_SIZE > 0
+
+  char* i;
+  char* end;
+
+  /*
+   * This is the most we would ever need to flush.
+   */
+ 
+  if (len > NIOS2_ICACHE_SIZE)
+  {
+    len = NIOS2_ICACHE_SIZE;
+  }
+
+  end = ((char*) start) + len;
+
+  for (i = start; i < end; i+= NIOS2_ICACHE_LINE_SIZE)
+  { 
+    __asm__ volatile ("flushi %0" :: "r" (i)); 
+  }
+
+  /* 
+   * For an unaligned flush request, we've got one more line left.
+   * Note that this is dependent on NIOS2_ICACHE_LINE_SIZE to be a 
+   * multiple of 2 (which it always is).
+   */
+
+  if (((alt_u32) start) & (NIOS2_ICACHE_LINE_SIZE - 1))
+  {
+    __asm__ volatile ("flushi %0" :: "r" (i));
+  }
+
+  /* 
+   * Having flushed the cache, flush any stale instructions in the 
+   * pipeline 
+   */
+
+  __asm__ volatile ("flushp");
+
+#endif /* NIOS2_ICACHE_SIZE > 0 */
+}

software/signal_processing_bsp/HAL/src/alt_icache_flush_all.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2003 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+
+#include "nios2.h"
+#include "system.h"
+
+#include "alt_types.h"
+#include "sys/alt_cache.h" 
+
+/*
+ * alt_icache_flush_all() is called to flush the entire instruction cache.
+ */
+
+void alt_icache_flush_all (void)
+{
+#if NIOS2_ICACHE_SIZE > 0
+  alt_icache_flush (0, NIOS2_ICACHE_SIZE);
+#endif
+}

software/signal_processing_bsp/HAL/src/alt_iic.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2009 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+#include "system.h"
+
+/*
+ * This file implements the HAL Enhanced interrupt API for Nios II processors
+ * with an internal interrupt controller (IIC). For most routines, this serves 
+ * as a wrapper layer over the legacy interrupt API (which must be used with 
+ * the IIC only). 
+ *
+ * Use of the enhanced API is recommended so that application and device
+ * drivers are compatible with a Nios II system configured with an external 
+ * interrupt controller (EIC), or IIC. This will afford maximum portability. 
+ *
+ * If an EIC is present, the EIC device driver must provide these routines, 
+ * because their operation will be specific to that EIC type. 
+ */
+#ifndef NIOS2_EIC_PRESENT
+#ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT
+
+#include "sys/alt_irq.h"
+#include "priv/alt_iic_isr_register.h"
+#include "priv/alt_legacy_irq.h"
+                            
+/** @Function Description:  This function registers an interrupt handler. 
+  * If the function is succesful, then the requested interrupt will be enabled upon 
+  * return. Registering a NULL handler will disable the interrupt.
+  * @API Type:              External
+  * @param ic_id            Ignored.
+  * @param irq              IRQ number
+  * @return                 0 if successful, else error (-1)
+  */
+int alt_ic_isr_register(alt_u32 ic_id, alt_u32 irq, alt_isr_func isr, 
+  void *isr_context, void *flags)
+{
+    return alt_iic_isr_register(ic_id, irq, isr, isr_context, flags);
+}  
+
+/** @Function Description:  This function enables a single interrupt.
+  * @API Type:              External
+  * @param ic_id            Ignored.
+  * @param irq              IRQ number
+  * @return                 0 if successful, else error (-1)
+  */
+int alt_ic_irq_enable (alt_u32 ic_id, alt_u32 irq)
+{
+    return alt_irq_enable(irq);
+}
+
+/** @Function Description:  This function disables a single interrupt.
+  * @API Type:              External
+  * @param ic_id            Ignored.
+  * @param irq              IRQ number
+  * @return                 0 if successful, else error (-1)
+  */
+int alt_ic_irq_disable(alt_u32 ic_id, alt_u32 irq)
+{
+    return alt_irq_disable(irq);
+}
+
+/** @Function Description:  This function to determine if corresponding
+  *                         interrupt is enabled.
+  * @API Type:              External
+  * @param ic_id            Ignored.
+  * @param irq              IRQ number
+  * @return                 Zero if corresponding interrupt is disabled and
+  *                         non-zero otherwise.
+  */
+alt_u32 alt_ic_irq_enabled(alt_u32 ic_id, alt_u32 irq)
+{
+    alt_u32 irq_enabled;
+
+    NIOS2_READ_IENABLE(irq_enabled);
+
+    return (irq_enabled & (1 << irq)) ? 1: 0;
+}
+
+#endif /* ALT_ENHANCED_INTERRUPT_API_PRESENT */
+#endif /* NIOS2_EIC_PRESENT */

software/signal_processing_bsp/HAL/src/alt_iic_isr_register.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2009      Altera Corporation, San Jose, California, USA.      *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+#include <errno.h>
+#include "system.h"
+
+/*
+ * Provides an interrupt registry mechanism for the any CPUs internal interrupt
+ * controller (IIC) when the enhanced interrupt API is active.
+ */
+#ifndef ALT_CPU_EIC_PRESENT
+#ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT
+
+#include "alt_types.h"
+#include "sys/alt_irq.h"
+#include "priv/alt_iic_isr_register.h"
+
+/*
+ * The header, alt_irq_entry.h, contains the exception entry point, and is
+ * provided by the processor component. It is included here, so that the code
+ * will be added to the executable only if alt_irq_register() is present, i.e.
+ * if no interrupts are registered - there's no need to provide any 
+ * interrupt handling.
+ */
+
+#include "sys/alt_irq_entry.h"
+
+/*
+ * The header, alt_irq_table.h contains a table describing which function
+ * handles each interrupt.
+ */
+
+#include "priv/alt_irq_table.h"
+
+/** @Function Description:  This function registers an interrupt handler. 
+  * If the function is succesful, then the requested interrupt will be enabled
+  * upon return. Registering a NULL handler will disable the interrupt.
+  *
+  * @API Type:              External
+  * @param ic_id            Interrupt controller ID
+  * @param irq              IRQ ID number
+  * @param isr              Pointer to interrupt service routine
+  * @param isr_context      Opaque pointer passed to ISR
+  * @param flags            
+  * @return                 0 if successful, else error (-1)
+  */
+int alt_iic_isr_register(alt_u32 ic_id, alt_u32 irq, alt_isr_func isr, 
+  void *isr_context, void *flags)
+{
+  int rc = -EINVAL;  
+  int id = irq;             /* IRQ interpreted as the interrupt ID. */
+  alt_irq_context status;
+
+  if (id < ALT_NIRQ)
+  {
+    /* 
+     * interrupts are disabled while the handler tables are updated to ensure
+     * that an interrupt doesn't occur while the tables are in an inconsistant
+     * state.
+     */
+
+    status = alt_irq_disable_all();
+
+    alt_irq[id].handler = isr;
+    alt_irq[id].context = isr_context;
+
+    rc = (isr) ? alt_ic_irq_enable(ic_id, id) : alt_ic_irq_disable(ic_id, id);
+
+    alt_irq_enable_all(status);
+  }
+
+  return rc; 
+}
+
+#endif /* ALT_ENHANCED_INTERRUPT_API_PRESENT */
+#endif /* ALT_CPU_EIC_PRESENT */

software/signal_processing_bsp/HAL/src/alt_instruction_exception_entry.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2008 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+#include "sys/alt_exceptions.h"
+#include "nios2.h"
+#include "alt_types.h"
+#include "system.h"
+
+/*
+ * This file implements support for calling user-registered handlers for
+ * instruction-generated exceptions. This handler could also be reached
+ * in the event of a spurious interrupt.
+ *
+ * The handler code is optionally enabled through the "Enable
+ * Instruction-related Exception API" HAL BSP setting, which will
+ * define the macro below.
+ */
+#ifdef ALT_INCLUDE_INSTRUCTION_RELATED_EXCEPTION_API
+
+/* Function pointer to exception callback routine */
+alt_exception_result (*alt_instruction_exception_handler)
+  (alt_exception_cause, alt_u32, alt_u32) = 0x0;
+
+/* Link entry routine to .exceptions section */
+int alt_instruction_exception_entry (alt_u32 exception_pc)
+  __attribute__ ((section (".exceptions")));
+
+/*
+ * This is the entry point for instruction-generated exceptions handling.
+ * This routine will be called by alt_exceptions_entry.S, after it determines
+ * that an exception could not be handled by handlers that preceed that
+ * of instruction-generated exceptions (such as interrupts).
+ *
+ * For this to function properly, you must register an exception handler
+ * using alt_instruction_exception_register(). This routine will call
+ * that handler if it has been registered. Absent a handler, it will
+ * break break or hang as discussed below.
+ */
+int 
+alt_instruction_exception_entry (alt_u32 exception_pc)
+{
+  alt_u32 cause, badaddr;
+
+/*
+ * If the processor hardware has the optional EXCEPTIONS & BADADDR registers,
+ * read them and pass their content to the user handler. These are always
+ * present if the MMU or MPU is enabled, and optionally for other advanced
+ * exception types via the "Extra exceptions information" setting in the
+ * processor (hardware) configuration.
+ *
+ * If these registers are not present, the cause field will be set to
+ * NIOS2_EXCEPTION_CAUSE_NOT_PRESENT. Your handling routine should
+ * check the validity of the cause argument before proceeding.
+ */
+#ifdef NIOS2_HAS_EXTRA_EXCEPTION_INFO
+  /* Get exception cause & "badaddr" */
+  NIOS2_READ_EXCEPTION(cause);
+  cause = ( (cause & NIOS2_EXCEPTION_REG_CAUSE_MASK) >>
+              NIOS2_EXCEPTION_REG_CAUSE_OFST );
+
+  NIOS2_READ_BADADDR(badaddr);
+#else
+  cause = NIOS2_EXCEPTION_CAUSE_NOT_PRESENT;
+  badaddr = 0;
+#endif /* NIOS2_HAS_EXTRA_EXCEPTION_INFO */
+
+  if(alt_instruction_exception_handler) {
+    /*
+     * Call handler. Its return value indicates whether the exception-causing
+     * instruction should be re-issued. The code that called us,
+     * alt_eceptions_entry.S, will look at this value and adjust the ea
+     * register as necessary
+     */
+    return alt_instruction_exception_handler(cause, exception_pc, badaddr);
+  }
+  /*
+   * We got here because an instruction-generated exception occured, but no
+   * handler is present. We do not presume to know how to handle it. If the
+   * debugger is present, break, otherwise hang.
+   *
+   * If you've reached here in the debugger, consider examining the
+   * EXCEPTIONS register cause bit-field, which was read into the 'cause'
+   * variable above, and compare it against the exceptions-type enumeration
+   * in alt_exceptions.h. This register is availabe if the MMU or MPU is
+   * present, or if the "Extra exceptions information" hardware option is
+   * selected.
+   *
+   *  If you get here then one of the following could have happened:
+   *
+   *  - An instruction-generated exception occured, and the processor
+   *    does not have the extra exceptions feature enabled, or you
+   *    have not registered a handler using
+   *    alt_instruction_exception_register()
+   *
+   *  Some examples of instruction-generated exceptions and why they
+   *  might occur:
+   *
+   *  - Your program could have been compiled for a full-featured
+   *    Nios II core, but it is running on a smaller core, and
+   *    instruction emulation has been disabled by defining
+   *    ALT_NO_INSTRUCTION_EMULATION.
+   *
+   *    You can work around the problem by re-enabling instruction
+   *    emulation, or you can figure out why your program is being
+   *    compiled for a system other than the one that it is running on.
+   *
+   *  - Your program has executed a trap instruction, but has not
+   *    implemented a handler for this instruction.
+   *
+   *  - Your program has executed an illegal instruction (one which is
+   *    not defined in the instruction set).
+   *
+   *  - Your processor includes an MMU or MPU, and you have enabled it
+   *    before registering an exception handler to service exceptions it
+   *    generates.
+   *
+   * The problem could also be hardware related:
+   *  - If your hardware is broken and is generating spurious interrupts
+   *    (a peripheral which negates its interrupt output before its
+   *    interrupt handler has been executed will cause spurious interrupts)
+   */
+  else {
+#ifdef NIOS2_HAS_DEBUG_STUB
+    NIOS2_BREAK();
+#else
+    while(1)
+      ;
+#endif /* NIOS2_HAS_DEBUG_STUB */
+  }
+
+  /* We should not get here. Remove compiler warning. */
+  return NIOS2_EXCEPTION_RETURN_REISSUE_INST;
+}
+
+#endif /* ALT_INCLUDE_INSTRUCTION_RELATED_EXCEPTION_API */
+
+/*
+ * This routine indicates whether a particular exception cause will have
+ * set a valid address into the BADADDR register, which is included
+ * in the arguments to a user-registered instruction-generated exception
+ * handler. Many exception types do not set valid contents in BADADDR;
+ * this is a convenience routine to easily test the validity of that
+ * argument in your handler.
+ *
+ * Note that this routine will return false (0) for causes 
+ * NIOS2_EXCEPTION_TLB_MISS and NIOS2_EXCEPTION_ECC_TLB_ERR.
+ * You must read the TLBMISC.D field to determine if BADADDR
+ * is valid for these (valid if TLBMISC.D = 1).
+ *
+ * Arguments:
+ * cause:  The 5-bit exception cause field of the EXCEPTIONS register,
+ *         shifted to the LSB position. You may pass the 'cause' argument
+ *         in a handler you registered directy to this routine.
+ *
+ * Return: 1: BADADDR (bad_addr argument to handler) is valid
+ *         0: BADADDR is not valid
+ */
+int 
+alt_exception_cause_generated_bad_addr(alt_exception_cause cause)
+{
+  switch (cause) {
+  case NIOS2_EXCEPTION_SUPERVISOR_ONLY_DATA_ADDR:
+  case NIOS2_EXCEPTION_MISALIGNED_DATA_ADDR:
+  case NIOS2_EXCEPTION_MISALIGNED_TARGET_PC:
+  case NIOS2_EXCEPTION_TLB_READ_PERM_VIOLATION:
+  case NIOS2_EXCEPTION_TLB_WRITE_PERM_VIOLATION:
+  case NIOS2_EXCEPTION_MPU_DATA_REGION_VIOLATION:
+  case NIOS2_EXCEPTION_ECC_DATA_ERR:
+    return 1;
+
+  case NIOS2_EXCEPTION_TLB_MISS:
+  case NIOS2_EXCEPTION_ECC_TLB_ERR:
+    return 0;
+
+  default:
+    return 0;
+  }
+}

software/signal_processing_bsp/HAL/src/alt_instruction_exception_register.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2008 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+#include "sys/alt_exceptions.h"
+#include "alt_types.h"
+#include "system.h"
+
+/*
+ * This file implements support for calling user-registered handlers for
+ * instruction-generated exceptions.
+ *
+ * The registry API is optionally enabled through the "Enable
+ * Instruction-related Exception API" HAL BSP setting, which will
+ * define the macro below.
+ */
+#ifdef ALT_INCLUDE_INSTRUCTION_RELATED_EXCEPTION_API
+
+/*
+ * The header, alt_exception_handler_registry.h contains a struct describing
+ * the registered exception handler
+ */
+#include "priv/alt_exception_handler_registry.h"
+
+/*
+ * Pull in the exception entry assembly code. This will not be linked in 
+ * unless this object is linked into the executable (i.e. only if 
+ * alt_instruction_exception_register() is called).
+ */
+__asm__( "\n\t.globl alt_exception" );
+
+/*
+ * alt_instruction_exception_register() is called to register a handler to
+ * service instruction-generated exceptions that are not handled by the
+ * default exception handler code (interrupts, and optionally unimplemented
+ * instructions and traps). 
+ * 
+ * Passing null (0x0) in the handler argument will disable a previously-
+ * registered handler.
+ *
+ * Note that if no handler is registered, exceptions that are not processed
+ * using the built-in handler (interrupts, and optionally unimplemented
+ * instructions and traps) are treated as unknown exceptions, resulting
+ * in either a break or an infinite loop.
+ */
+void alt_instruction_exception_register (
+  alt_exception_result (*exception_handler)(
+    alt_exception_cause cause,
+    alt_u32 exception_pc,
+    alt_u32 bad_addr) )
+{
+  alt_instruction_exception_handler = exception_handler;
+}
+
+#endif /* ALT_INCLUDE_INSTRUCTION_RELATED_EXCEPTION_API */

software/signal_processing_bsp/HAL/src/alt_io_redirect.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include <stddef.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#include "sys/alt_dev.h"
+#include "priv/alt_file.h"
+
+
+/*
+ * alt_open_fd() is similar to open() in that it is used to obtain a file
+ * descriptor for the file named "name". The "flags" and "mode" arguments are
+ * identical to the "flags" and "mode" arguments of open().
+ *
+ * The distinction between the two functions is that the file descriptor 
+ * structure to use is passed in as an argument, rather than allocated from the
+ * list of free file descriptors.
+ *
+ * This is used by alt_io_redirect() to redirect the stdin, stdout and stderr
+ * file descriptors to point to new devices.
+ *
+ * If the device can not be succesfully opened, then the input file descriptor
+ * remains unchanged.
+ */
+
+static void alt_open_fd(alt_fd* fd, const char* name, int flags, int mode)
+{
+  int old;
+
+  old = open (name, flags, mode);
+
+  if (old >= 0)
+  {
+    fd->dev      = alt_fd_list[old].dev;
+    fd->priv     = alt_fd_list[old].priv;
+    fd->fd_flags = alt_fd_list[old].fd_flags;
+
+    alt_release_fd (old);
+  }
+} 
+
+/*
+ * alt_io_redirect() is called once the device/filesystem lists have been 
+ * initialised, but before main(). Its function is to redirect standard in,
+ * standard out and standard error so that they point to the devices selected by
+ * the user (as defined in system.h).
+ *
+ * Prior to the call to this function, io is directed towards /dev/null. If
+ * i/o can not be redirected to the requested device, for example if the device 
+ * does not exist, then it remains directed at /dev/null. 
+ */
+ 
+void alt_io_redirect(const char* stdout_dev, 
+                     const char* stdin_dev, 
+                     const char* stderr_dev)
+{
+  /* Redirect the channels */
+
+  alt_open_fd (&alt_fd_list[STDOUT_FILENO], stdout_dev, O_WRONLY, 0777);
+  alt_open_fd (&alt_fd_list[STDIN_FILENO], stdin_dev, O_RDONLY, 0777);
+  alt_open_fd (&alt_fd_list[STDERR_FILENO], stderr_dev, O_WRONLY, 0777);
+}  
+
+
+
+

software/signal_processing_bsp/HAL/src/alt_ioctl.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2006 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include <stddef.h>
+
+#include "sys/ioctl.h"
+#include "sys/alt_errno.h"
+#include "sys/alt_warning.h"
+#include "priv/alt_file.h"
+#include "os/alt_syscall.h"
+
+/*
+ * The ioctl() system call is provided so that application code can manipulate 
+ * the i/o capabilities of a device in device specific ways. This is identical
+ * to the standard posix ioctl() function.
+ *
+ * In general this implementation simply vectors ioctl requests to the 
+ * apropriate drivers ioctl function (as registered in the drivers alt_dev
+ * structure).
+ *
+ * However in the case of devices (as oposed to filesystem), the TIOCEXCL and
+ * TIOCNXCL requests are handled without reference to the driver. These 
+ * requests are used to lock/release a device for exclusive access.
+ *
+ * Handling these requests centrally eases the task of device driver 
+ * development. 
+ *
+ * ALT_IOCTL is mapped onto the ioctl() system call in alt_syscall.h 
+ */
+ 
+#ifdef ALT_USE_DIRECT_DRIVERS
+
+#include "system.h"
+#include "sys/alt_driver.h"
+
+/*
+ * Provide minimal version that calls ioctl routine of provided stdio devices.
+ */
+int ALT_IOCTL (int file, int req, void* arg)
+{
+#ifdef ALT_STDIN_PRESENT
+    ALT_DRIVER_IOCTL_EXTERNS(ALT_STDIN_DEV);
+#endif
+#ifdef ALT_STDOUT_PRESENT
+    ALT_DRIVER_IOCTL_EXTERNS(ALT_STDOUT_DEV);
+#endif
+#ifdef ALT_STDERR_PRESENT
+    ALT_DRIVER_IOCTL_EXTERNS(ALT_STDERR_DEV);
+#endif
+
+#if !defined(ALT_STDIN_PRESENT) && !defined(ALT_STDOUT_PRESENT) && !defined(ALT_STDERR_PRESENT)
+    /* Generate a link time warning, should this function ever be called. */
+    ALT_STUB_WARNING(ioctl);
+#endif
+
+    switch (file) {
+#ifdef ALT_STDIN_PRESENT
+    case 0: /* stdin file descriptor */
+        return ALT_DRIVER_IOCTL(ALT_STDIN_DEV, req, arg);
+#endif /* ALT_STDIN_PRESENT */
+#ifdef ALT_STDOUT_PRESENT
+    case 1: /* stdout file descriptor */
+        return ALT_DRIVER_IOCTL(ALT_STDOUT_DEV, req, arg);
+#endif /* ALT_STDOUT_PRESENT */
+#ifdef ALT_STDERR_PRESENT
+    case 2: /* stderr file descriptor */
+        return ALT_DRIVER_IOCTL(ALT_STDERR_DEV, req, arg);
+#endif /* ALT_STDERR_PRESENT */
+    default:
+        ALT_ERRNO = EBADFD;
+        return -1;
+    }
+}
+
+#else /* !ALT_USE_DIRECT_DRIVERS */
+
+int ALT_IOCTL (int file, int req, void* arg)
+{
+  alt_fd* fd;
+  int     rc;
+
+  /*
+   * A common error case is that when the file descriptor was created, the call
+   * to open() failed resulting in a negative file descriptor. This is trapped
+   * below so that we don't try and process an invalid file descriptor.
+   */
+
+  fd = (file < 0) ? NULL : &alt_fd_list[file];
+  
+  if (fd)
+  {
+
+    /*
+     * In the case of device drivers (not file systems) handle the TIOCEXCL
+     * and TIOCNXCL requests as special cases.
+     */
+
+    if (fd->fd_flags & ALT_FD_DEV)
+    {
+      if (req == TIOCEXCL)
+      {
+        rc = alt_fd_lock (fd);
+        goto ioctl_done;
+      }
+      else if (req == TIOCNXCL)
+      {
+        rc = alt_fd_unlock (fd);
+        goto ioctl_done;
+      }
+    }
+
+    /*
+     * If the driver provides an ioctl() function, call that to handle the
+     * request, otherwise set the return code to indicate that the request
+     * could not be processed.
+     */
+   
+    if (fd->dev->ioctl)
+    {
+      rc = fd->dev->ioctl(fd, req, arg);
+    }
+    else
+    {
+      rc = -ENOTTY;
+    }
+  }
+  else  
+  {
+    rc = -EBADFD;
+  }
+
+ioctl_done:
+
+  if (rc < 0)
+  {
+    ALT_ERRNO = -rc;
+  }
+  return rc;
+}
+
+#endif /* ALT_USE_DIRECT_DRIVERS */

software/signal_processing_bsp/HAL/src/alt_irq_entry.S

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2003-2004 Altera Corporation, San Jose, California, USA.      *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+
+#include "system.h"
+
+/*
+ * This is the interrupt exception entry point code, which saves all the
+ * registers and calls the interrupt handler.  It should be pulled in using
+ * a .globl from alt_irq_register.c.  This scheme is used so that if an
+ * interrupt is never registered, then this code will not appear in the
+ * generated executable, thereby improving code footprint.
+ */
+
+        /*
+         * Explicitly allow the use of r1 (the assembler temporary register)
+         * within this code. This register is normally reserved for the use of
+         * the compiler.
+         */
+        .set noat
+
+        /*
+         * Pull in the exception handler register save code.
+         */
+        .globl alt_exception
+
+        .globl alt_irq_entry
+        .section .exceptions.entry.label, "xa"
+alt_irq_entry:
+
+        /*
+         * Section .exceptions.entry is in alt_exception_entry.S
+         * This saves all the caller saved registers and reads estatus into r5
+         */
+
+        .section .exceptions.irqtest, "xa"
+
+#ifdef ALT_CI_INTERRUPT_VECTOR_N
+        /*
+         * Use the interrupt vector custom instruction if present to accelerate
+         * this code.
+         * If the interrupt vector custom instruction returns a negative
+         * value, there are no interrupts active (estatus.pie is 0
+         * or ipending is 0) so assume it is a software exception.
+         */
+        custom ALT_CI_INTERRUPT_VECTOR_N, r4, r0, r0
+        blt r4, r0, .Lnot_irq
+#else
+        /*
+         * Test to see if the exception was a software exception or caused 
+         * by an external interrupt, and vector accordingly.
+         */
+        rdctl r4, ipending
+        andi  r2, r5, 1
+        beq   r2, zero, .Lnot_irq
+        beq   r4, zero, .Lnot_irq
+#endif /* ALT_CI_INTERRUPT_VECTOR_N */
+
+        .section .exceptions.irqhandler, "xa"
+        /*
+         * Now that all necessary registers have been preserved, call 
+         * alt_irq_handler() to process the interrupts.
+         */
+
+        call alt_irq_handler
+
+        .section .exceptions.irqreturn, "xa"
+
+        br    .Lexception_exit
+
+        .section .exceptions.notirq.label, "xa"
+
+.Lnot_irq:
+
+        /*
+         * Section .exceptions.exit is in alt_exception_entry.S
+         * This restores all the caller saved registers
+         */
+
+        .section .exceptions.exit.label
+.Lexception_exit:
+

software/signal_processing_bsp/HAL/src/alt_irq_handler.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2009      Altera Corporation, San Jose, California, USA.      *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include <errno.h>
+#include "system.h"
+
+/*
+ * This interrupt handler only works with an internal interrupt controller
+ * (IIC). Processors with an external interrupt controller (EIC) use an 
+ * implementation provided by an EIC driver.
+ */
+#ifndef ALT_CPU_EIC_PRESENT
+
+#include "sys/alt_irq.h"
+#include "os/alt_hooks.h"
+
+#include "alt_types.h"
+
+/*
+ * A table describing each interrupt handler. The index into the array is the
+ * interrupt id associated with the handler. 
+ *
+ * When an interrupt occurs, the associated handler is called with
+ * the argument stored in the context member.
+ */
+struct ALT_IRQ_HANDLER
+{
+#ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT
+  void (*handler)(void*);
+#else
+  void (*handler)(void*, alt_u32);
+#endif
+  void *context;
+} alt_irq[ALT_NIRQ];
+
+/*
+ * alt_irq_handler() is called by the interrupt exception handler in order to 
+ * process any outstanding interrupts. 
+ *
+ * It is defined here since it is linked in using weak linkage. 
+ * This means that if there is never a call to alt_irq_register() (above) then
+ * this function will not get linked in to the executable. This is acceptable
+ * since if no handler is ever registered, then an interrupt can never occur.
+ *
+ * If Nios II interrupt vector custom instruction exists, use it to accelerate
+ * the dispatch of interrupt handlers.  The Nios II interrupt vector custom 
+ * instruction is present if the macro ALT_CI_INTERRUPT_VECTOR defined.
+ */
+
+void alt_irq_handler (void) __attribute__ ((section (".exceptions")));
+void alt_irq_handler (void)
+{
+#ifdef ALT_CI_INTERRUPT_VECTOR
+  alt_32 offset;
+  char*  alt_irq_base = (char*)alt_irq;
+#else
+  alt_u32 active;
+  alt_u32 mask;
+  alt_u32 i;
+#endif /* ALT_CI_INTERRUPT_VECTOR */
+  
+  /*
+   * Notify the operating system that we are at interrupt level.
+   */ 
+  
+  ALT_OS_INT_ENTER();
+
+#ifdef ALT_CI_INTERRUPT_VECTOR
+  /*
+   * Call the interrupt vector custom instruction using the 
+   * ALT_CI_INTERRUPT_VECTOR macro.
+   * It returns the offset into the vector table of the lowest-valued pending
+   * interrupt (corresponds to highest priority) or a negative value if none.
+   * The custom instruction assumes that each table entry is eight bytes.
+   */
+  while ((offset = ALT_CI_INTERRUPT_VECTOR) >= 0) {
+    struct ALT_IRQ_HANDLER* handler_entry = 
+      (struct ALT_IRQ_HANDLER*)(alt_irq_base + offset);
+#ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT
+    handler_entry->handler(handler_entry->context);
+#else
+    handler_entry->handler(handler_entry->context, offset >> 3);
+#endif
+  }
+#else /* ALT_CI_INTERRUPT_VECTOR */
+  /* 
+   * Obtain from the interrupt controller a bit list of pending interrupts,
+   * and then process the highest priority interrupt. This process loops, 
+   * loading the active interrupt list on each pass until alt_irq_pending() 
+   * return zero.
+   * 
+   * The maximum interrupt latency for the highest priority interrupt is
+   * reduced by finding out which interrupts are pending as late as possible.
+   * Consider the case where the high priority interupt is asserted during
+   * the interrupt entry sequence for a lower priority interrupt to see why
+   * this is the case.
+   */
+
+  active = alt_irq_pending ();
+
+  do
+  {
+    i = 0;
+    mask = 1;
+
+    /*
+     * Test each bit in turn looking for an active interrupt. Once one is 
+     * found, the interrupt handler asigned by a call to alt_irq_register() is
+     * called to clear the interrupt condition.
+     */
+
+    do
+    {
+      if (active & mask)
+      { 
+#ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT
+        alt_irq[i].handler(alt_irq[i].context); 
+#else
+        alt_irq[i].handler(alt_irq[i].context, i); 
+#endif
+        break;
+      }
+      mask <<= 1;
+      i++;
+
+    } while (1);
+
+    active = alt_irq_pending ();
+    
+  } while (active);
+#endif /* ALT_CI_INTERRUPT_VECTOR */
+
+  /*
+   * Notify the operating system that interrupt processing is complete.
+   */ 
+
+  ALT_OS_INT_EXIT();
+}
+
+#endif /* ALT_CPU_EIC_PRESENT */

software/signal_processing_bsp/HAL/src/alt_irq_register.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2009      Altera Corporation, San Jose, California, USA.      *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+#include <errno.h>
+#include "system.h"
+
+/*
+ * This interrupt registry mechanism works with the Nios II internal interrupt 
+ * controller (IIC) only. Systems with an external interrupt controller (EIC),
+ * or those with the IIC who are using the enhanced interrupt API will
+ * utilize the alt_ic_isr_register() routine to register an interrupt. 
+ */
+#ifndef NIOS2_EIC_PRESENT
+
+#include "sys/alt_irq.h"
+#include "priv/alt_legacy_irq.h"
+#include "os/alt_hooks.h"
+
+#include "alt_types.h"
+
+/*
+ * The header, alt_irq_entry.h, contains the exception entry point, and is
+ * provided by the processor component. It is included here, so that the code
+ * will be added to the executable only if alt_irq_register() is present, i.e.
+ * if no interrupts are registered - there's no need to provide any 
+ * interrupt handling.
+ */
+
+#include "sys/alt_irq_entry.h"
+
+/*
+ * The header, alt_irq_table.h contains a table describing which function
+ * handles each interrupt.
+ */
+
+#include "priv/alt_irq_table.h"
+
+/*
+ * alt_irq_handler() is called to register an interrupt handler. If the 
+ * function is succesful, then the requested interrupt will be enabled upon 
+ * return. Registering a NULL handler will disable the interrupt.
+ *
+ * The return value is 0 if the interrupt handler was registered and the 
+ * interrupt was enabled, otherwise it is negative.
+ */
+ 
+int alt_irq_register (alt_u32 id, 
+                      void* context, 
+                      alt_isr_func handler)
+{
+  int rc = -EINVAL;  
+  alt_irq_context status;
+
+  if (id < ALT_NIRQ)
+  {
+    /* 
+     * interrupts are disabled while the handler tables are updated to ensure
+     * that an interrupt doesn't occur while the tables are in an inconsistant
+     * state.
+     */
+
+    status = alt_irq_disable_all ();
+
+    alt_irq[id].handler = handler;
+    alt_irq[id].context = context;
+
+    rc = (handler) ? alt_irq_enable (id): alt_irq_disable (id);
+
+    alt_irq_enable_all(status);
+  }
+  return rc; 
+}
+#endif /* NIOS2_EIC_PRESENT */
+

software/signal_processing_bsp/HAL/src/alt_irq_vars.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2003 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+******************************************************************************/
+
+#include "alt_types.h"
+
+#include "system.h"
+
+/*
+ * These global variables are used to save the current list of enabled 
+ * interrupts. See alt_irq.h for further details.
+ */
+
+volatile alt_u32 alt_irq_active    = 0;
+
+#ifndef ALT_EXCEPTION_STACK
+
+volatile alt_u32 alt_priority_mask = (alt_u32) -1;
+
+#endif
+

software/signal_processing_bsp/HAL/src/alt_isatty.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2006 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include <stddef.h>
+#include <sys/stat.h>
+
+#include "sys/alt_dev.h"
+#include "sys/alt_errno.h"
+#include "sys/alt_warning.h"
+#include "priv/alt_file.h"
+#include "os/alt_syscall.h"
+
+#ifdef ALT_USE_DIRECT_DRIVERS
+
+#include "system.h"
+
+/*
+ * Provide minimal version that just describes all file descriptors 
+ * as tty devices for provided stdio devices.
+ */
+int ALT_ISATTY (int file)
+{
+    switch (file) {
+#ifdef ALT_STDIN_PRESENT
+    case 0: /* stdin file descriptor */
+#endif /* ALT_STDIN_PRESENT */
+#ifdef ALT_STDOUT_PRESENT
+    case 1: /* stdout file descriptor */
+#endif /* ALT_STDOUT_PRESENT */
+#ifdef ALT_STDERR_PRESENT
+    case 2: /* stderr file descriptor */
+#endif /* ALT_STDERR_PRESENT */
+        return 1;
+    default:
+        return 0;
+    }
+
+#if !defined(ALT_STDIN_PRESENT) && !defined(ALT_STDOUT_PRESENT) && !defined(ALT_STDERR_PRESENT)
+    /* Generate a link time warning, should this function ever be called. */
+    ALT_STUB_WARNING(isatty);
+#endif
+}
+
+#else /* !ALT_USE_DIRECT_DRIVERS */
+/*
+ * isatty() can be used to determine whether the input file descriptor "file" 
+ * refers to a terminal device or not. If it is a terminal device then the
+ * return value is one, otherwise it is zero.  
+ *
+ * ALT_ISATTY is mapped onto the isatty() system call in alt_syscall.h
+ */
+ 
+int ALT_ISATTY (int file)
+{
+  alt_fd*     fd;
+  struct stat stat;
+
+  /*
+   * A common error case is that when the file descriptor was created, the call
+   * to open() failed resulting in a negative file descriptor. This is trapped
+   * below so that we don't try and process an invalid file descriptor.
+   */
+
+  fd = (file < 0) ? NULL : &alt_fd_list[file];
+  
+  if (fd)
+  {
+    /*
+     * If a device driver does not provide an fstat() function, then it is 
+     * treated as a terminal device by default.
+     */
+
+    if (!fd->dev->fstat)
+    {
+      return 1;
+    }
+
+    /*
+     * If a driver does provide an implementation of the fstat() function, then
+     * this is called so that the device can identify itself.
+     */ 
+
+    else
+    {
+      fstat (file, &stat);
+      return (stat.st_mode == _IFCHR) ? 1 : 0;
+    }
+  }
+  else
+  {
+    ALT_ERRNO = EBADFD;
+    return 0;
+  }
+}
+
+#endif /* ALT_USE_DIRECT_DRIVERS */

software/signal_processing_bsp/HAL/src/alt_kill.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include <signal.h>
+#include <unistd.h>
+
+#include "sys/alt_errno.h"
+#include "os/alt_syscall.h"
+
+
+/*
+ * kill() is used by newlib in order to send signals to processes. Since there
+ * is only a single process in the HAL, the only valid values for pid are 
+ * either the current process id, or the broadcast values, i.e. pid must be
+ * less than or equal to zero. 
+ *
+ * ALT_KILL is mapped onto the kill() system call in alt_syscall.h
+ */
+
+int ALT_KILL (int pid, int sig)
+{
+  int status = 0;
+
+  if (pid <= 0)
+  {
+    switch (sig)
+    {
+    case 0:
+
+      /* The null signal is used to check that a pid is valid. */
+
+      break;
+
+    case SIGABRT:
+    case SIGALRM:
+    case SIGFPE:
+    case SIGILL:
+    case SIGKILL:
+    case SIGPIPE:
+    case SIGQUIT:
+    case SIGSEGV:
+    case SIGTERM:
+    case SIGUSR1:
+    case SIGUSR2:
+    case SIGBUS:
+    case SIGPOLL:
+    case SIGPROF:
+    case SIGSYS:
+    case SIGTRAP:
+    case SIGVTALRM:
+    case SIGXCPU:
+    case SIGXFSZ:
+
+      /* 
+       * The Posix standard defines the default behaviour for all these signals 
+       * as being eqivalent to a call to _exit(). No mechanism is provided to 
+       * change this behaviour.
+       */
+
+      _exit(0);
+    case SIGCHLD:
+    case SIGURG:
+
+      /* 
+       * The Posix standard defines these signals to be ignored by default. No 
+       * mechanism is provided to change this behaviour.
+       */
+
+      break;
+    default:
+
+      /* Tried to send an unsupported signal */
+
+      status = EINVAL;
+    }
+  }
+
+  else if (pid > 0)
+  {
+    /* Attempted to signal a non-existant process */
+
+    status = ESRCH;
+  }
+
+  if (status)
+  {
+    ALT_ERRNO = status;
+    return -1;
+  }
+
+  return 0;
+}

software/signal_processing_bsp/HAL/src/alt_link.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004 Altera Corporation, San Jose, California, USA.           *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include "sys/alt_warning.h"
+#include "sys/alt_errno.h"
+#include "os/alt_syscall.h"
+
+/*
+ * link() is used by newlib to create a new link to an existing file. This is 
+ * unsupported in the HAL environment. However a "do-nothing" implementation 
+ * is still provied for newlib compatability. 
+ *
+ * ALT_LINK is mapped onto the link() system call in alt_syscall.h
+ */
+ 
+int ALT_LINK ( char *existing, char *new)
+{
+  /* Generate a link time warning, should this function ever be called. */
+
+  ALT_STUB_WARNING(link);
+
+  /* Indicate an error */
+
+  ALT_ERRNO = ENOSYS;
+  return -1;
+}
+

software/signal_processing_bsp/HAL/src/alt_load.c

+/******************************************************************************
+*                                                                             *
+* License Agreement                                                           *
+*                                                                             *
+* Copyright (c) 2004-2005 Altera Corporation, San Jose, California, USA.      *
+* All rights reserved.                                                        *
+*                                                                             *
+* Permission is hereby granted, free of charge, to any person obtaining a     *
+* copy of this software and associated documentation files (the "Software"),  *
+* to deal in the Software without restriction, including without limitation   *
+* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *
+* and/or sell copies of the Software, and to permit persons to whom the       *
+* Software is furnished to do so, subject to the following conditions:        *
+*                                                                             *
+* The above copyright notice and this permission notice shall be included in  *
+* all copies or substantial portions of the Software.                         *
+*                                                                             *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *
+* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *
+* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *
+* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *
+* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *
+* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *
+* DEALINGS IN THE SOFTWARE.                                                   *
+*                                                                             *
+* This agreement shall be governed in all respects by the laws of the State   *
+* of California and by the laws of the United States of America.              *
+*                                                                             *
+* Altera does not recommend, suggest or require that this reference design    *
+* file be used in conjunction or combination with any other product.          *
+******************************************************************************/
+
+#include "sys/alt_load.h"
+#include "sys/alt_cache.h"
+
+/*
+ * Linker defined symbols.
+   These used to be
+ *    extern alt_u32 __flash_rwdata_start;
+ *    extern alt_u32 __ram_rwdata_start;
+ *    extern alt_u32 __ram_rwdata_end;
+ * but that results in a fatal error when compiling -mgpopt=global
+ * because gcc assumes they are normal C variables in .sdata
+ * and therefore addressable from gp using a 16-bit offset,
+ * when in fact they are special values defined by linker.x
+ * and located nowhere near .sdata. 
+ * Specifying __attribute__((section(".data"))) will force these
+ * in .data. (CASE:258384.)
+ */
+
+extern alt_u32 __flash_rwdata_start __attribute__((section(".data")));
+extern alt_u32 __ram_rwdata_start __attribute__((section(".data")));
+extern alt_u32 __ram_rwdata_end __attribute__((section(".data")));
+extern alt_u32 __flash_rodata_start __attribute__((section(".data")));
+extern alt_u32 __ram_rodata_start __attribute__((section(".data")));
+extern alt_u32 __ram_rodata_end __attribute__((section(".data")));
+extern alt_u32 __flash_exceptions_start __attribute__((section(".data")));  
+extern alt_u32 __ram_exceptions_start __attribute__((section(".data")));
+extern alt_u32 __ram_exceptions_end __attribute__((section(".data")));
+
+/*
+ * alt_load() is called when the code is executing from flash. In this case
+ * there is no bootloader, so this application is responsible for loading to
+ * RAM any sections that are required.
+ */  
+
+void alt_load (void)
+{
+  /* 
+   * Copy the .rwdata section. 
+   */
+
+  alt_load_section (&__flash_rwdata_start, 
+		               &__ram_rwdata_start,
+		               &__ram_rwdata_end);
+
+  /*
+   * Copy the exception handler.
+   */
+
+  alt_load_section (&__flash_exceptions_start, 
+		                &__ram_exceptions_start,
+		                &__ram_exceptions_end);
+
+  /*
+   * Copy the .rodata section.
+   */
+
+  alt_load_section (&__flash_rodata_start, 
+		                &__ram_rodata_start,
+		                &__ram_rodata_end);
+  
+  /*
+   * Now ensure that the caches are in synch.
+   */
+  
+  alt_dcache_flush_all();
+  alt_icache_flush_all();
+}