31 lines
895 B
C
31 lines
895 B
C
// pic.c
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// Author: Josh Holtrop
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// Created: 02/26/04
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#include "hos_defines.h"
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#include "pic.h"
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#include "sys/io.h"
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//Re-maps the Programmable Interrupr Controllers so IRQ0->pic1 base address, IRG8->pic2 base address
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void pic_remap(int pic1, int pic2)
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{
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byte a1, a2;
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a1 = inportb(PIC1_DATA); //0x21
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a2 = inportb(PIC2_DATA); //0xA1
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outportb(PIC1_COMMAND, ICW1_INIT+ICW1_ICW4); //0x20, 0x10+0x01 00010001b
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outportb(PIC2_COMMAND, ICW1_INIT+ICW1_ICW4); //0xA0, 0x10+0x01 00010001b
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outportb(PIC1_DATA, pic1); //0x21, pic1
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outportb(PIC2_DATA, pic2); //0xA1, pic2
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outportb(PIC1_DATA, 4); //0x21, 0x04 00000100b
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outportb(PIC2_DATA, 2); //0xA1, 0x02 00000010b
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outportb(PIC1_DATA, ICW4_8086); //0x21, 0x01 00000001b
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outportb(PIC2_DATA, ICW4_8086); //0xA1, 0x01 00000001b
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outportb(PIC1_DATA, a1); //0x21
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outportb(PIC2_DATA, a2); //0xA1
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}
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