30 lines
1.0 KiB
C
30 lines
1.0 KiB
C
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#pragma once
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#include "stddef.h"
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#include "stdlib.h"
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// thank you osdev.
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#define PIC1 0x20 // master PIC
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#define PIC2 0xA0 // slave PIC
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#define PIC1_COMMAND PIC1
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#define PIC1_DATA (PIC1+1)
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#define PIC2_COMMAND PIC2
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#define PIC2_DATA (PIC2+1)
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#define PIC_EOI 0x20
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#define ICW1_ICW4 0x01 /* Indicates that ICW4 will be present */
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#define ICW1_SINGLE 0x02 /* Single (cascade) mode */
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#define ICW1_INTERVAL4 0x04 /* Call address interval 4 (8) */
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#define ICW1_LEVEL 0x08 /* Level triggered (edge) mode */
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#define ICW1_INIT 0x10 /* Initialization - required! */
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#define ICW4_8086 0x01 /* 8086/88 (MCS-80/85) mode */
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#define ICW4_AUTO 0x02 /* Auto (normal) EOI */
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#define ICW4_BUF_SLAVE 0x08 /* Buffered mode/slave */
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#define ICW4_BUF_MASTER 0x0C /* Buffered mode/master */
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#define ICW4_SFNM 0x10 /* Special fully nested (not) */
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#define CASCADE_IRQ 2
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inline void PIC_sendEOI(uint8_t irq) {
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if (irq >= 8) { // slave also needs EOI
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outb(PIC2_COMMAND,PIC_EOI);
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}
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outb(PIC1_COMMAND,PIC_EOI);
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}
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extern void PIC_remap(int offset1, int offset2);
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