rt-thread/libcpu/arm/AT91SAM7X/interrupt.c

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/*
* File : trap.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006, RT-Thread Development Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://openlab.rt-thread.com/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2006-08-23 Bernard first version
* 2013-03-29 aozima Modify the interrupt interface implementations.
*/
#include <rtthread.h>
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#include <rthw.h>
#include "AT91SAM7X256.h"
#define MAX_HANDLERS 32
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/* exception and interrupt handler table */
struct rt_irq_desc irq_desc[MAX_HANDLERS];
extern rt_uint32_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
*/
/*@{*/
static void rt_hw_interrupt_handler(int vector, void *param)
{
rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
}
/**
* This function will initialize hardware interrupt
*/
void rt_hw_interrupt_init(void)
{
rt_base_t index;
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/* init exceptions table */
for(index=0; index < MAX_HANDLERS; index++)
{
irq_desc[index].handler = (rt_isr_handler_t)rt_hw_interrupt_handler;
irq_desc[index].param = RT_NULL;
}
for (index = 0; index < MAX_HANDLERS; index ++)
{
AT91C_BASE_AIC->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)
{
/* disable interrupt */
AT91C_BASE_AIC->AIC_IDCR = 1 << vector;
/* clear interrupt */
AT91C_BASE_AIC->AIC_ICCR = 1 << vector;
}
/**
* This function will un-mask a interrupt.
* @param vector the interrupt number
*/
void rt_hw_interrupt_umask(int vector)
{
AT91C_BASE_AIC->AIC_IECR = 1 << vector;
}
/**
* This function will install a interrupt service routine to a interrupt.
* @param vector the interrupt number
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* @param handler the interrupt service routine to be installed
* @param param the parameter for interrupt service routine
* @name unused.
*
* @return the old handler
*/
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rt_isr_handler_t rt_hw_interrupt_install(int vector, rt_isr_handler_t handler,
void *param, char *name)
{
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rt_isr_handler_t old_handler = RT_NULL;
if(vector >= 0 && vector < MAX_HANDLERS)
{
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old_handler = irq_desc[vector].handler;
if (handler != RT_NULL)
{
irq_desc[vector].handler = (rt_isr_handler_t)handler;
irq_desc[vector].param = param;
}
}
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return old_handler;
}
/*@}*/