mirror of
https://github.com/Tom-on64/kern.git
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62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
#include "irq.h"
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#include "stdint.h"
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#include "system.h"
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void* irqRoutines[16] = { 0 };
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void installIrqHandler(uint32_t irq, void (*handler)(struct regs* r)) {
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irqRoutines[irq] = handler;
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}
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void uninstallIrqHandler(uint32_t irq) {
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irqRoutines[irq] = 0;
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}
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// I have no clue how or what this does, but it makes everything work
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void irqRemap(void) {
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outb(0xa0, 0x11);
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outb(0x20, 0x11);
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outb(0x21, 0x20);
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outb(0xa1, 0x28);
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outb(0x21, 0x04);
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outb(0xa1, 0x02);
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outb(0x21, 0x01);
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outb(0xa1, 0x01);
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outb(0x21, 0x0);
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outb(0xa1, 0x0);
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}
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void irqHandler(struct regs* r) {
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void (*handler)(struct regs* r);
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handler = irqRoutines[r->intNo - 32]; // Offset by 32 because of isrs
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if (handler) handler(r);
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// Something about master and slave handlers
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if (r->intNo >= 40) outb(0xa0, 0x20);
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outb(0x20, 0x20);
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}
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void setupIrqs() {
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irqRemap();
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// Same as isrs, but differnet handlers :o
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idtSetGate(32, (unsigned)irq0, 0x08, 0x8e);
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idtSetGate(33, (unsigned)irq1, 0x08, 0x8e);
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idtSetGate(34, (unsigned)irq2, 0x08, 0x8e);
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idtSetGate(35, (unsigned)irq3, 0x08, 0x8e);
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idtSetGate(36, (unsigned)irq4, 0x08, 0x8e);
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idtSetGate(37, (unsigned)irq5, 0x08, 0x8e);
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idtSetGate(38, (unsigned)irq6, 0x08, 0x8e);
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idtSetGate(39, (unsigned)irq7, 0x08, 0x8e);
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idtSetGate(40, (unsigned)irq8, 0x08, 0x8e);
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idtSetGate(41, (unsigned)irq9, 0x08, 0x8e);
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idtSetGate(42, (unsigned)irq10, 0x08, 0x8e);
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idtSetGate(43, (unsigned)irq11, 0x08, 0x8e);
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idtSetGate(44, (unsigned)irq12, 0x08, 0x8e);
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idtSetGate(45, (unsigned)irq13, 0x08, 0x8e);
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idtSetGate(46, (unsigned)irq14, 0x08, 0x8e);
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idtSetGate(47, (unsigned)irq15, 0x08, 0x8e);
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}
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