80X86 MULTI-TASKING OPERATION SYSTEM: pic.c Source File

00001 /*******************
00002 *Project: 80X86 32BIT MULTI TASKING OPERATING SYSTEM
00003 *Description:driver for 8259 programable interrupt controller 
00004 *
00005 *File:rtc.c
00006 *Author: Book Chen
00007 *Date: 2010.01.01
00008 ********************
00009 */
00010 #include "includes.h"
00011 
00012 void PicInit(void){
00013     OutByte(PIC_MASTER,0x11);     //set icw1...edge trigger,2*8259,use icw4
00014     OutByte(PIC_SLAVE,0x11);      //set icw1...edge trigger,2*8259,use icw4
00015     OutByte(PIC_MASTER2,INT_VECTOR_IRQ0); //set irq0~7 at 0x20~0x27
00016     OutByte(PIC_SLAVE2,INT_VECTOR_IRQ8);  //set irq8~15 at 0x28~0x2f
00017     OutByte(PIC_MASTER2,0x4);     //tell master that interrupt of slave 8259 is at master's irq2
00018     OutByte(PIC_SLAVE2,0x2);      //tell slave 8259 that interrupt of slave 8259 is at master irq2
00019     OutByte(PIC_MASTER2,0x03);    //normal eoi,x86 use
00020     OutByte(PIC_SLAVE2,0x03);     //normal eoi,x86 use
00021     OutByte(PIC_SLAVE2,0xff);     //0xff...disable all interrupts in slave ipc
00022     OutByte(PIC_MASTER2,0xfb);    //0xff...disable all interrupts in slave ipc,except irq2 for second 8259
00023 }