rt-thread/libcpu/arm/sep4020/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
* 2006-03-13 Bernard first version
*/
#include <rtthread.h>
#include <sep4020.h>
#define MAX_HANDLERS 32
extern rt_uint32_t rt_interrupt_nest;
/* exception and interrupt handler table */
rt_isr_handler_t isr_table[MAX_HANDLERS];
rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
rt_uint32_t rt_thread_switch_interrput_flag;
/**
* @addtogroup S3C24X0
*/
/*@{*/
rt_isr_handler_t rt_hw_interrupt_handle(rt_uint32_t vector)
{
rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
return RT_NULL;
}
/**
* This function will initialize hardware interrupt
*/
void rt_hw_interrupt_init()
{
register rt_uint32_t idx;
/*Make sure all intc registers in proper state*/
/*mask all the irq*/
*(RP)(INTC_IMR) = 0xFFFFFFFF;
/*enable all the irq*/
*(RP)(INTC_IER) = 0XFFFFFFFF;
/*Dont use any forced irq*/
*(RP)(INTC_IFR) = 0x0;
/*Disable all the fiq*/
*(RP)(INTC_FIER) = 0x0;
/*Mask all the fiq*/
*(RP)(INTC_FIMR) = 0x0F;
/*Dont use forced fiq*/
*(RP)(INTC_FIFR) = 0x0;
/*Intrrupt priority register*/
*(RP)(INTC_IPLR) = 0x0;
/* init exceptions table */
for(idx=0; idx < MAX_HANDLERS; idx++)
{
isr_table[idx] = (rt_isr_handler_t)rt_hw_interrupt_handle;
}
/* 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_interrput_flag = 0;
}
/**
* This function will mask a interrupt.
* @param vector the interrupt number
*/
void rt_hw_interrupt_mask(rt_uint32_t vector)
{
*(RP)(INTC_IMR) |= 1 << vector;
}
/**
* This function will un-mask a interrupt.
* @param vector the interrupt number
*/
void rt_hw_interrupt_umask(rt_uint32_t vector)
{
if(vector == 16)
{
rt_kprintf("Interrupt vec %d is not used!\n", vector);
}
else
*(RP)(INTC_IMR) &= ~(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(rt_uint32_t vector, rt_isr_handler_t new_handler, rt_isr_handler_t *old_handler)
{
if(vector < MAX_HANDLERS)
{
if (*old_handler != RT_NULL)
*old_handler = isr_table[vector];
if (new_handler != RT_NULL)
isr_table[vector] = new_handler;
}
}
/*@}*/