82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
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#pragma once
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#include "../../kernel/ps2.c"
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#include "../../kernel/syscall.c"
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#include "./asm.c"
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#include "./idt.c"
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#include "handlers.h"
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enum irq_code_t {
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IRQCODE_PIT = 32,
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IRQCODE_PS2 = 33,
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IRQCODE_SYSCALL = 128,
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};
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void kb_handler() {
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uint8_t char_code = inb(0x60);
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handle_keypress(char_code);
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}
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void remap_irq(void) {
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outb(0x20, 0x11);
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outb(0xA0, 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 init_irq() {
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remap_irq();
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set_idt_row(32, (uint32_t)irq0, KERNEL_CODE_SEL, KERNEL_INTERRUPT_FLAG);
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set_idt_row(33, (uint32_t)irq1, KERNEL_CODE_SEL, KERNEL_INTERRUPT_FLAG);
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set_idt_row(34, (uint32_t)irq2, KERNEL_CODE_SEL, KERNEL_INTERRUPT_FLAG);
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set_idt_row(35, (uint32_t)irq3, KERNEL_CODE_SEL, KERNEL_INTERRUPT_FLAG);
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set_idt_row(36, (uint32_t)irq4, KERNEL_CODE_SEL, KERNEL_INTERRUPT_FLAG);
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set_idt_row(37, (uint32_t)irq5, KERNEL_CODE_SEL, KERNEL_INTERRUPT_FLAG);
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set_idt_row(38, (uint32_t)irq6, KERNEL_CODE_SEL, KERNEL_INTERRUPT_FLAG);
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set_idt_row(39, (uint32_t)irq7, KERNEL_CODE_SEL, KERNEL_INTERRUPT_FLAG);
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set_idt_row(40, (uint32_t)irq8, KERNEL_CODE_SEL, KERNEL_INTERRUPT_FLAG);
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set_idt_row(41, (uint32_t)irq9, KERNEL_CODE_SEL, KERNEL_INTERRUPT_FLAG);
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set_idt_row(42, (uint32_t)irq10, KERNEL_CODE_SEL, KERNEL_INTERRUPT_FLAG);
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set_idt_row(43, (uint32_t)irq11, KERNEL_CODE_SEL, KERNEL_INTERRUPT_FLAG);
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set_idt_row(44, (uint32_t)irq12, KERNEL_CODE_SEL, KERNEL_INTERRUPT_FLAG);
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set_idt_row(45, (uint32_t)irq13, KERNEL_CODE_SEL, KERNEL_INTERRUPT_FLAG);
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set_idt_row(46, (uint32_t)irq14, KERNEL_CODE_SEL, KERNEL_INTERRUPT_FLAG);
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set_idt_row(47, (uint32_t)irq15, KERNEL_CODE_SEL, KERNEL_INTERRUPT_FLAG);
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set_idt_row(128, (uint32_t)irq128, KERNEL_CODE_SEL, USER_TRAP_FLAG);
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}
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void irq_handler(struct regs *r) {
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switch (r->int_no) {
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case IRQCODE_SYSCALL: {
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syscall(r);
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break;
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};
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case IRQCODE_PIT: {
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schedule(r);
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break;
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};
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case IRQCODE_PS2: {
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kb_handler();
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break;
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};
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}
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// Send EOI to follower controller
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if (r->int_no >= 40 && r->int_no < 48) {
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outb(0xA0, 0x20);
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}
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// Send EOI to leader controller
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outb(0x20, 0x20);
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}
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