98 lines
2.0 KiB
C
98 lines
2.0 KiB
C
// Interrupt Requests setup
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// Author: xamidev
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// Licensed under the Unlicense. See the repo below.
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// https://github.com/xamidev/blankos
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#include "system.h"
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#include "io.h"
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#include "idt.h"
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#include "../libc/stdio.h"
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extern void irq0();
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extern void irq1();
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extern void irq2();
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extern void irq3();
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extern void irq4();
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extern void irq5();
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extern void irq6();
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extern void irq7();
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extern void irq8();
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extern void irq9();
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extern void irq10();
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extern void irq11();
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extern void irq12();
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extern void irq13();
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extern void irq14();
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extern void irq15();
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void *irq_routines[16] =
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{
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0
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};
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void irq_install_handler(int irq, void (*handler)(struct regs *r))
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{
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irq_routines[irq] = handler;
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}
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void irq_uninstall_handler(int irq)
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{
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irq_routines[irq] = 0;
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}
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void irq_remap(void)
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{
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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 irq_install()
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{
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irq_remap();
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idt_set_gate(32, (unsigned)irq0, 0x08, 0x8E);
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idt_set_gate(33, (unsigned)irq1, 0x08, 0x8E);
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idt_set_gate(34, (unsigned)irq2, 0x08, 0x8E);
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idt_set_gate(35, (unsigned)irq3, 0x08, 0x8E);
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idt_set_gate(36, (unsigned)irq4, 0x08, 0x8E);
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idt_set_gate(37, (unsigned)irq5, 0x08, 0x8E);
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idt_set_gate(38, (unsigned)irq6, 0x08, 0x8E);
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idt_set_gate(39, (unsigned)irq7, 0x08, 0x8E);
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idt_set_gate(40, (unsigned)irq8, 0x08, 0x8E);
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idt_set_gate(41, (unsigned)irq9, 0x08, 0x8E);
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idt_set_gate(42, (unsigned)irq10, 0x08, 0x8E);
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idt_set_gate(43, (unsigned)irq11, 0x08, 0x8E);
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idt_set_gate(44, (unsigned)irq12, 0x08, 0x8E);
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idt_set_gate(45, (unsigned)irq13, 0x08, 0x8E);
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idt_set_gate(46, (unsigned)irq14, 0x08, 0x8E);
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idt_set_gate(47, (unsigned)irq15, 0x08, 0x8E);
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printf("[kernel] installed irq 0-15\n");
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}
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void irq_handler(struct regs *r)
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{
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void (*handler)(struct regs *r);
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handler = irq_routines[r->int_no-32];
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if (handler)
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{
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handler(r);
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}
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if (r->int_no >= 40)
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{
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outb(0xA0, 0x20);
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}
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outb(0x20, 0x20);
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}
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