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96 lines
1.8 KiB
C
96 lines
1.8 KiB
C
#ifndef INTERRUPT_PIC_H
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#define INTERRUPT_PIC_H
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#include <ports/io.h>
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// PIC I/O Ports
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#define PIC_1_CMD 0x20
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#define PIC_1_DATA 0x21
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#define PIC_2_CMD 0xA0
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#define PIC_2_DATA 0xA1
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// IRQs
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#define NEW_IRQ_0 0x20 // IRQ 0 : int 32
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#define NEW_IRQ_8 0x28 // IRQ 8 : int 40
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// Commands
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#define PIC_EOI 0x20 // End Of Interrupt
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#define PIC_DISABLE 0xff
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void sendPicEOI(uint8_t irq) {
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if (irq >= 8) {
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outb(PIC_2_CMD, PIC_EOI);
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}
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outb(PIC_1_CMD, PIC_EOI);
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}
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void disableIrqs() {
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outb(PIC_2_DATA, PIC_DISABLE);
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outb(PIC_1_DATA, PIC_DISABLE);
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}
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void setIrqMask(uint8_t irq) {
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uint16_t port;
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uint8_t value;
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if (irq < 8) {
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port = PIC_1_DATA;
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} else {
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irq -= 8;
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port = PIC_2_DATA;
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}
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value = inb(port) | (1 << irq);
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outb(port, value);
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}
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void unsetIrqMask(uint8_t irq) {
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uint16_t port;
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uint8_t value;
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if (irq < 8) {
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port = PIC_1_DATA;
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} else {
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irq -= 8;
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port = PIC_2_DATA;
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}
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value = inb(port) & ~(1 << irq);
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outb(port, value);
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}
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void remapPic() {
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uint8_t pic1Mask = inb(PIC_1_DATA);
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uint8_t pic2Mask = inb(PIC_2_DATA);
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// Send Init Control Word 1-4 to both PICs
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// ICW 1: bit 0 - send up to 4 ICWs, bit 4 - Init PIC
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outb(PIC_1_CMD, 0x11);
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ioWait(); // For slower machines
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outb(PIC_2_CMD, 0x11);
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ioWait();
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// ICW 2: Where to map IRW bases in IDT
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outb(PIC_1_DATA, NEW_IRQ_0);
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ioWait();
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outb(PIC_2_DATA, NEW_IRQ_8);
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ioWait();
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// ICW 3: Which IRQ in PIC1 is PIC2; Mapping PIC2 to IRQ 2
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outb(PIC_1_DATA, 0x04);
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ioWait();
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outb(PIC_2_DATA, 0x02);
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ioWait();
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// ICW 4 - Set x86 mode
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outb(PIC_1_DATA, 0x01);
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ioWait();
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outb(PIC_2_DATA, 0x01);
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ioWait();
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outb(PIC_1_DATA, pic1Mask);
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outb(PIC_2_DATA, pic2Mask);
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}
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#endif
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