55 lines
1.1 KiB
C
55 lines
1.1 KiB
C
#include "idt.h"
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#include "io.h"
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#include <stdint.h>
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#define IDT_ENTRIES 256
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struct idt_entry {
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uint16_t base_lo;
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uint16_t sel;
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uint8_t always0;
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uint8_t flags;
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uint16_t base_hi;
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} __attribute__((packed));
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struct idt_ptr {
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uint16_t limit;
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uint32_t base;
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} __attribute__((packed));
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struct idt_entry idt[IDT_ENTRIES];
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struct idt_ptr idtp;
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void idt_set_gate(uint8_t num, uint32_t base, uint16_t sel, uint8_t flags) {
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idt[num].base_lo = base & 0xFFFF;
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idt[num].base_hi = (base >> 16) & 0xFFFF;
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idt[num].sel = sel;
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idt[num].always0 = 0;
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idt[num].flags = flags | 0x60;
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}
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void idt_install() {
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idtp.limit = (sizeof(struct idt_entry) * IDT_ENTRIES) - 1;
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idtp.base = (uint32_t)&idt;
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idt_load();
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}
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void pic_remap(int offset1, int offset2) {
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unsigned char a1, a2;
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a1 = inb(0x21);
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a2 = inb(0xA1);
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outb(0x20, 0x11);
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outb(0xA0, 0x11);
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outb(0x21, offset1);
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outb(0xA1, offset2);
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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, a1);
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outb(0xA1, a2);
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} |