5a37ddfbe6
Gregory Nutt is the copyright holder for those files and he has submitted the SGA as a result we can migrate the licenses to Apache. Signed-off-by: Alin Jerpelea <alin.jerpelea@sony.com>
115 lines
3.6 KiB
C
115 lines
3.6 KiB
C
/****************************************************************************
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* arch/misoc/src/minerva/minerva_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 <debug.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/irq.h>
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#include <arch/board/board.h>
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#include "group/group.h"
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#include "minerva.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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uint32_t *minerva_doirq(int irq, uint32_t * regs)
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{
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board_autoled_on(LED_INIRQ);
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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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* 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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/* Disable further occurrences of this interrupt (until the interrupt
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* sources have been clear by the driver).
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*/
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up_disable_irq(irq);
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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 running
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* task is closed down gracefully (data caches dump, MMU flushed) and
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* set up the address environment for the new thread at the head of
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* 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 = (uint32_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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/* Unmask the last interrupt (global interrupts are still disabled) */
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up_enable_irq(irq);
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board_autoled_off(LED_INIRQ);
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return regs;
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}
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