rt-thread/libcpu/arm/AT91SAM7S/interrupt.c

/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2006-08-23     Bernard      first version
 */

#include <rtthread.h>
#include "AT91SAM7S.h"

#define MAX_HANDLERS    32

rt_inline rt_bool_t _interrupt_vector_is_valid(int vector)
{
    return (vector >= 0) && (vector < MAX_HANDLERS);
}

extern rt_atomic_t rt_interrupt_nest;

rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
rt_uint32_t rt_thread_switch_interrupt_flag;

/**
 * @addtogroup AT91SAM7
 */
/*@{*/

void rt_hw_interrupt_handler(int vector)
{
    rt_kprintf("Unhandled interrupt %d occurred!!!\n", vector);
}

/**
 * This function will initialize hardware interrupt
 */
void rt_hw_interrupt_init()
{
    rt_base_t index;

    for (index = 0; index < MAX_HANDLERS; index ++)
    {
        AT91C_AIC_SVR(index) = (rt_uint32_t)rt_hw_interrupt_handler;
    }

    /* init interrupt nest, and context in thread sp */
    rt_interrupt_nest = 0;
    rt_interrupt_from_thread = 0;
    rt_interrupt_to_thread = 0;
    rt_thread_switch_interrupt_flag = 0;
}

/**
 * This function will mask a interrupt.
 * @param vector the interrupt number
 */
void rt_hw_interrupt_mask(int vector)
{
    if (!_interrupt_vector_is_valid(vector))
    {
        return;
    }

    /* disable interrupt */
    AT91C_AIC_IDCR = 1 << vector;

    /* clear interrupt */
    AT91C_AIC_ICCR = 1 << vector;
}

/**
 * This function will un-mask a interrupt.
 * @param vector the interrupt number
 */
void rt_hw_interrupt_umask(int vector)
{
    if (!_interrupt_vector_is_valid(vector))
    {
        return;
    }

    AT91C_AIC_IECR = 1 << vector;
}

/**
 * This function will install a interrupt service routine to a interrupt.
 * @param vector the interrupt number
 * @param new_handler the interrupt service routine to be installed
 * @param old_handler the old interrupt service routine
 */
void rt_hw_interrupt_install(int vector, rt_isr_handler_t new_handler, rt_isr_handler_t *old_handler)
{
    if(vector >= 0 && vector < MAX_HANDLERS)
    {
        if (*old_handler != RT_NULL) *old_handler = (rt_isr_handler_t)AT91C_AIC_SVR(vector);
        if (new_handler != RT_NULL) AT91C_AIC_SVR(vector) = (rt_uint32_t)new_handler;
    }
}

/*@}*/