6a3c2aded6
* Simplify EINTR/ECANCEL error handling 1. Add semaphore uninterruptible wait function 2 .Replace semaphore wait loop with a single uninterruptible wait 3. Replace all sem_xxx to nxsem_xxx * Unify the void cast usage 1. Remove void cast for function because many place ignore the returned value witout cast 2. Replace void cast for variable with UNUSED macro
139 lines
4.9 KiB
C
139 lines
4.9 KiB
C
/****************************************************************************
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* arch/hc/src/common/up_doirq.c
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*
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* Copyright (C) 2011, 2014-2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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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
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* are met:
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*
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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <assert.h>
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#include <nuttx/irq.h>
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#include <nuttx/arch.h>
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#include <nuttx/board.h>
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#include <arch/board/board.h>
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#include "up_arch.h"
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#include "up_internal.h"
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#include "group/group.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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uint8_t *up_doirq(int irq, uint8_t *regs)
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{
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board_autoled_on(LED_INIRQ);
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#ifdef CONFIG_SUPPRESS_INTERRUPTS
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PANIC();
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#else
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/* Current regs non-zero indicates that we are processing an interrupt;
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* g_current_regs is also used to manage interrupt level context switches.
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*
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* Nested interrupts are not supported
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*/
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DEBUGASSERT(g_current_regs == NULL);
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g_current_regs = regs;
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/* Deliver the IRQ */
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irq_dispatch(irq, regs);
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#if defined(CONFIG_ARCH_FPU) || defined(CONFIG_ARCH_ADDRENV)
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/* Check for a context switch. If a context switch occurred, then
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* g_current_regs will have a different value than it did on entry. If an
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* interrupt level context switch has occurred, then restore the floating
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* point state and the establish the correct address environment before
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* returning from the interrupt.
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*/
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if (regs != g_current_regs)
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{
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#ifdef CONFIG_ARCH_FPU
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/* Restore floating point registers */
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up_restorefpu((uint32_t*)g_current_regs);
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#endif
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#ifdef CONFIG_ARCH_ADDRENV
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/* Make sure that the address environment for the previously
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* running task is closed down gracefully (data caches dump,
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* MMU flushed) and set up the address environment for the new
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* thread at the head of the ready-to-run list.
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*/
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group_addrenv(NULL);
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#endif
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}
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#endif
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/* If a context switch occurred while processing the interrupt then
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* g_current_regs may have change value. If we return any value different
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* from the input regs, then the lower level will know that a context
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* switch occurred during interrupt processing.
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*/
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regs = (uint8_t*)g_current_regs;
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/* Set g_current_regs to NULL to indicate that we are no longer in an
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* interrupt handler.
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*/
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g_current_regs = NULL;
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#endif
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board_autoled_off(LED_INIRQ);
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return regs;
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}
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