107 lines
3.5 KiB
C
107 lines
3.5 KiB
C
/****************************************************************************
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* arch/arm/src/armv7-r/arm_doirq.c
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*
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* Copyright (C) 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 <nuttx/irq.h>
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#include <nuttx/arch.h>
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#include <assert.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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* Public Functions
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****************************************************************************/
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uint32_t *arm_doirq(int irq, uint32_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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/* Nested interrupts are not supported */
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DEBUGASSERT(CURRENT_REGS == NULL);
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/* Current regs non-zero indicates that we are processing an interrupt;
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* CURRENT_REGS is also used to manage interrupt level context switches.
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*/
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CURRENT_REGS = regs;
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/* Deliver the IRQ */
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irq_dispatch(irq, regs);
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#ifdef CONFIG_ARCH_FPU
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/* Check for a context switch. If a context switch occurred, then
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* 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 != CURRENT_REGS)
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{
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/* Restore floating point registers */
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up_restorefpu((uint32_t *)CURRENT_REGS);
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}
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#endif
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/* Set 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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regs = (uint32_t *)CURRENT_REGS;
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CURRENT_REGS = NULL;
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board_autoled_off(LED_INIRQ);
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#endif
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return regs;
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}
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