isr.c

it is a sample code for s3c2410 board.

#include "isr.h"

#define NULL  0

/*****************************
*interrupt vector table
*****************************/
voidfun (ISRHandlerTable)[IRQ_INT_NO] ;

/*****************************
 * clear interrupt status
 *****************************/
void ClrIntStatus(void)
{
    INTMSK = 0x1FFFFF;  // disable all interrupt
    INTPND = 0x1FFFFF;  // clear wait bit
}
/*****************************
 * initial interrupt vectortable
 *****************************/
void InitialHandler_ISR(void)
{
    int i;

    for (i=0; i<IRQ_INT_NO; i++)
    {
        ISRHandlerTable[i] = NULL;
    }
}

/*****************************
 * setting interrupt handler
 *****************************/
void InstallHandler_ISR(int i, voidfun isr)
{
    if ((i >= 0) && (i < IRQ_INT_NO))
    {
        ISRHandlerTable[i] = isr;
    }
}

/*****************************
 * intrrupt entry function
 *****************************/
void ISR_IRQ(void)
{
    int IRQindex;

    IRQindex = INTOSET_IRQ >> 2;
    if ((IRQindex >= 0) && (IRQindex < IRQ_INT_NO)) {
        if (ISRHandlerTable[IRQindex] != NULL) {

            ISRHandlerTable[IRQindex]();
        }
    }
}



/*****************************
 * enable irq
 *****************************/
void enable_IRQ(void)
{
	//ENABLE_IRQ();
/*    asm volatile ("MRS r0, CPSR\n");
    asm volatile ("BIC r0, r0, #0x80\n");
    asm volatile ("MSR CPSR_c, r0\n");
*/
}

/*****************************
 * disable irq
 *****************************/
void disable_IRQ(void)
{
	//DISABLE_IRQ();
/*    asm volatile ("MRS r0, CPSR\n");
    asm volatile ("ORR r0, r0, #0x80\n");
    asm volatile ("MSR CPSR_c, r0\n");
*/
}