59 lines
1.1 KiB
C
59 lines
1.1 KiB
C
#include "idt.h"
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static struct idt idt = { 0 };
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void handle_interrupt()
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{
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return;
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}
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struct idt_entry create_idt_entry(uint32_t offset,
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struct segment_selector selector)
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{
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struct idt_entry res = { 0 };
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res.selector = selector;
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res.offset_1 = offset & 0xffff;
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res.offset_2 = (offset >> 16) & 0xffff;
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res.type = INTERRUPT_TYPE;
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res.size = 1;
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res.desc_priv = 0;
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res.present = 1;
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return res;
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}
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static void create_idt(void)
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{
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struct segment_selector selector;
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selector.rpl = 0;
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selector.table_indicator = 0;
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selector.index = KERNEL_CS_INDEX;
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for (int i = 0; i < IDT_NB_ENTRIES; ++i)
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{
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struct idt_entry entry = create_idt_entry((uint32_t)&handle_interrupt,
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selector);
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idt.entries[i] = entry;
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}
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}
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static void load_idt(void)
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{
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struct idt_r idtr;
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idtr.addr = (uint32_t)&idt;
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idtr.limit = IDT_SIZE - 1;
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asm volatile("lidt %0\n"
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:
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: "m" (idtr)
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: "memory");
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}
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void init_idt(void)
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{
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create_idt();
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load_idt();
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}
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