84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
/****************************************************************************
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* arch/or1k/src/common/or1k_doirq.c
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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 "or1k_internal.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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uint32_t *or1k_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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uint32_t *savestate;
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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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savestate = (uint32_t *)CURRENT_REGS;
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CURRENT_REGS = regs;
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/* Acknowledge the interrupt */
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or1k_ack_irq(irq);
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/* Deliver the IRQ */
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irq_dispatch(irq, regs);
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/* If a context switch occurred while processing the interrupt then
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* CURRENT_REGS may have changed 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 = (uint32_t *)CURRENT_REGS;
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/* Restore the previous value of CURRENT_REGS. NULL would indicate that
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* we are no longer in an interrupt handler. It will be non-NULL if we
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* are returning from a nested interrupt.
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*/
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CURRENT_REGS = savestate;
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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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