Luchian Mihai
c2f9368c7e
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127 lines
3.2 KiB
C
127 lines
3.2 KiB
C
/****************************************************************************
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* arch/arm/src/armv6-m/arm_doirq.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <sched/sched.h>
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#include "arm_internal.h"
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#include "exc_return.h"
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#include "nvic.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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void exception_direct(void)
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{
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int irq = getipsr();
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arm_ack_irq(irq);
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irq_dispatch(irq, NULL);
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if (g_running_tasks[this_cpu()] != this_task())
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{
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up_trigger_irq(NVIC_IRQ_PENDSV, 0);
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}
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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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struct tcb_s **running_task = &g_running_tasks[this_cpu()];
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struct tcb_s *tcb = *running_task;
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/* This judgment proves that (*running_task)->xcp.regs
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* is invalid, and we can safely overwrite it.
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*/
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if (*running_task != NULL)
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{
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tcb->xcp.regs = 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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/* Acknowledge the interrupt */
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arm_ack_irq(irq);
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if (irq == NVIC_IRQ_PENDSV)
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{
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#ifdef CONFIG_ARCH_HIPRI_INTERRUPT
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/* Dispatch the PendSV interrupt */
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irq_dispatch(irq, regs);
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#endif
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if (tcb->sigdeliver)
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{
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/* Pendsv able to access running tcb with no critical section */
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up_schedule_sigaction(tcb);
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}
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up_irq_save();
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}
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else
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{
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irq_dispatch(irq, regs);
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}
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tcb = this_task();
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/* Update scheduler parameters */
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nxsched_suspend_scheduler(*running_task);
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nxsched_resume_scheduler(tcb);
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/* Record the new "running" task when context switch occurred.
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* g_running_tasks[] is only used by assertion logic for reporting
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* crashes.
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*/
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*running_task = tcb;
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regs = tcb->xcp.regs;
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#endif
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board_autoled_off(LED_INIRQ);
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/* (*running_task)->xcp.regs is about to become invalid
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* and will be marked as NULL to avoid misusage.
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*/
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(*running_task)->xcp.regs = NULL;
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return regs;
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}
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