#include "s3c2410.h"#include "interrupt.h"#include "serial.h"#include "sched.h"void IRQ_Handle(){	unsigned long oft = INTOFFSET;	switch( oft )	{		case EINT1_OFT:	printk("EINT1, K1 pressed!\n\r");	break;		case EINT2_OFT:	printk("EINT2, K2 pressed!\n\r");	break;		case EINT3_OFT:	printk("EINT3, K3 pressed!\n\r");	break;		case EINT4_7_OFT:	printk("EINT7, K4 pressed!\n\r");	break;		case INT_TIMER0_OFT:	do_timer();			break;		default:		printk("Interrupt unknown!\n\r");	break;				}	//清中斷	if( oft == 4 ) EINTPEND = 1<<7;		//EINT4-7合用IRQ4，注意EINTPEND[3:0]保留未用，向這些位寫入1可能導致未知結果	SRCPND = 1<<oft;		INTPND	= INTPND;	 }void OS_ENTER_CRITICAL(){__asm__(	"mrs	r0,	cpsr\n"	/*讀cpsr*/	"orr	r0, r0, 	#0x80\n"	/*I-bit=1*/	"msr	cpsr_c,	r0\n"	/*設置I-bit=1，禁止IRQ中斷*/	);	}void OS_EXIT_CRITICAL(){__asm__(	"mrs	r0,	cpsr\n"	/*讀cpsr*/	"bic	r0, r0, 	#0x80\n"	/*I-bit=0*/	"msr	cpsr_c,	r0\n"	/*設置I-bit=0，開IRQ中斷*/	); }