48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
#pragma once
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#include <stdint.h>
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#include "types.h"
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struct __attribute__((packed)) idt_gate_descriptor {
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uint16_t offset_0;
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uint16_t segment_selector;
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uint8_t ist; // unused in 32-bit
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/* `flags`
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=======
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bit 0-3: gate type
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bit 4: unused
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bit 5-6: dpl
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bit 7: present bit
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DPL is ignored by hardware interupts and present bit must be 1 */
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uint8_t flags;
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uint16_t offset_1;
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};
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_Static_assert(sizeof(struct idt_gate_descriptor) == 8);
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enum idt_flags : uint8_t {
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IDT_GATE_TYPE_TASK = 0x5,
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IDT_GATE_TYPE_INTERRUPT16 = 0x6,
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IDT_GATE_TYPE_TRAP16 = 0x7,
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IDT_GATE_TYPE_INTERRUPT32 = 0xE,
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IDT_GATE_TYPE_TRAP32 = 0xF,
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IDT_PRESENT = 1 << 7,
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};
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enum idt_dpl : uint8_t {
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IDT_DPL_0 = 0 << 5,
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IDT_DPL_1 = 1 << 5,
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IDT_DPL_2 = 2 << 5,
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IDT_DPL_3 = 3 << 5,
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};
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struct idt_gate_descriptor idt_encode_descriptor(void* func, segment_t segment_selector, enum idt_dpl dpl, enum idt_flags type);
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void idt_load(struct idt_gate_descriptor table[], uint16_t size);
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