87 lines
2.1 KiB
C
87 lines
2.1 KiB
C
#include <stdint.h>
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#include "cpu.h"
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#define IDT_PRESENT 0x80
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#define IDT_INTERRUPT_GATE 0x0e
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struct idt_entry {
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uint16_t offset_low;
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uint16_t selector;
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uint8_t ist;
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uint8_t type_attr;
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uint16_t offset_mid;
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uint32_t offset_high;
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uint32_t reserved;
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} __attribute__((packed));
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struct idtr {
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uint16_t limit;
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uint64_t base;
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} __attribute__((packed));
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static struct idt_entry idt[256];
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static void load_idt(const struct idtr *idtr)
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{
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__asm__ volatile("lidt (%0)" : : "r"(idtr) : "memory");
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}
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void idt_set_gate(uint8_t vector, void (*handler)(void))
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{
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uint64_t offset = (uint64_t)(uintptr_t)handler;
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struct idt_entry *entry = &idt[vector];
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entry->offset_low = (uint16_t)(offset & 0xffff);
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entry->selector = KERNEL_CODE_SELECTOR;
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entry->ist = 0;
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entry->type_attr = IDT_PRESENT | IDT_INTERRUPT_GATE;
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entry->offset_mid = (uint16_t)((offset >> 16) & 0xffff);
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entry->offset_high = (uint32_t)(offset >> 32);
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entry->reserved = 0;
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}
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void idt_init(void)
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{
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struct idtr idtr = {
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.limit = sizeof(idt) - 1,
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.base = (uint64_t)(uintptr_t)idt,
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};
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idt_set_gate(0, exception_0);
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idt_set_gate(1, exception_1);
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idt_set_gate(2, exception_2);
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idt_set_gate(3, exception_3);
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idt_set_gate(4, exception_4);
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idt_set_gate(5, exception_5);
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idt_set_gate(6, exception_6);
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idt_set_gate(7, exception_7);
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idt_set_gate(8, exception_8);
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idt_set_gate(9, exception_9);
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idt_set_gate(10, exception_10);
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idt_set_gate(11, exception_11);
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idt_set_gate(12, exception_12);
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idt_set_gate(13, exception_13);
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idt_set_gate(14, exception_14);
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idt_set_gate(15, exception_15);
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idt_set_gate(16, exception_16);
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idt_set_gate(17, exception_17);
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idt_set_gate(18, exception_18);
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idt_set_gate(19, exception_19);
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idt_set_gate(20, exception_20);
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idt_set_gate(21, exception_21);
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idt_set_gate(22, exception_22);
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idt_set_gate(23, exception_23);
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idt_set_gate(24, exception_24);
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idt_set_gate(25, exception_25);
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idt_set_gate(26, exception_26);
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idt_set_gate(27, exception_27);
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idt_set_gate(28, exception_28);
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idt_set_gate(29, exception_29);
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idt_set_gate(30, exception_30);
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idt_set_gate(31, exception_31);
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idt_set_gate(32, irq_32);
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load_idt(&idtr);
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}
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