91 lines
3.2 KiB
C
91 lines
3.2 KiB
C
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/*
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Copyright (c) 2012, Broadcom Europe Ltd
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of the copyright holder nor the
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names of its contributors may be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*=============================================================================
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VideoCore OS Abstraction Layer - IRQ support
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=============================================================================*/
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#ifndef VCOS_ISR_H
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#define VCOS_ISR_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "vcos_types.h"
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#include "pthreads/vcos_platform.h"
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/**
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* \file vcos_isr.h
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*
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* \section isr ISR support
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*
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* API for dispatching interrupts.
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*/
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/**
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*
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* Register an interrupt handler. The old handler (if any) is returned in
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* old_handler. The old handler should be called if the interrupt was not
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* for you.
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*
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* The handler function will be called in a context with interrupts disabled,
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* so should be written to be as short as possible. If significant processing
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* is needed, the handler should delegate to a thread.
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*
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* The handler function can call any OS primitive that does not block (e.g.
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* post a semaphore or set an event flag). Blocking operations (including memory
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* allocation from the system heap) are not permitted.
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*
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* To deregister an ISR, pass in NULL.
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*
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* @param vec Vector to register for
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* @param handler Handler to be called
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* @param old_handler Updated with the old handler, or NULL.
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*/
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VCOS_INLINE_DECL
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void vcos_register_isr(VCOS_UNSIGNED vec,
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VCOS_ISR_HANDLER_T handler,
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VCOS_ISR_HANDLER_T *old_handler);
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/** Disable interrupts, returning the old value (enabled/disabled) to the caller.
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*/
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VCOS_INLINE_DECL
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VCOS_UNSIGNED vcos_int_disable(void);
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/** Restore the previous interrupt enable/disable state.
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*/
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VCOS_INLINE_DECL
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void vcos_int_restore(VCOS_UNSIGNED previous);
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#ifdef __cplusplus
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}
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#endif
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#endif
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