96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
/****************************************************************************
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* arch/arm/src/armv6-m/arm_ramvec_attach.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 <errno.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 "ram_vectors.h"
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#ifdef CONFIG_ARCH_RAMVECTORS
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/* Common exception entrypoint */
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void exception_common(void);
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/****************************************************************************
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* Name: arm_ramvec_attach
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*
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* Description:
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* Configure the ram vector table so that IRQ number 'irq' will be
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* dispatched by hardware to 'vector'
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*
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****************************************************************************/
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int arm_ramvec_attach(int irq, up_vector_t vector)
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{
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int ret = -EINVAL;
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irqinfo("%s IRQ%d\n", vector ? "Attaching" : "Detaching", irq);
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if ((unsigned)irq < ARMV6M_VECTAB_SIZE)
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{
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irqstate_t flags;
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/* If the new vector is NULL, then the vector is being detached. In
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* this case, disable the itnerrupt and direct any interrupts to the
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* common exception handler.
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*/
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flags = enter_critical_section();
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if (vector == NULL)
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{
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/* Disable the interrupt if we can before detaching it. We might
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* not be able to do this for all interrupts.
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*/
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up_disable_irq(irq);
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/* Detaching the vector really means re-attaching it to the
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* common exception handler.
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*/
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vector = exception_common;
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}
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/* Save the new vector in the vector table */
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g_ram_vectors[irq] = vector;
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leave_critical_section(flags);
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ret = OK;
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}
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return ret;
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}
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#endif /* CONFIG_ARCH_RAMVECTORS */
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