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90 lines
3.2 KiB
90 lines
3.2 KiB
/* |
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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 "interface/vcos/vcos_types.h" |
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#include "vcos.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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