53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
#ifndef _KERNEL_IDT_H
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#define _KERNEL_IDT_H
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#include <stdint.h>
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#define IDT_ROWS 256
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#define TASK_GATE 0x5
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#define INT_GATE16 0x6
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#define TRAP_GATE16 0x7
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#define INT_GATE32 0xE
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#define TRAP_GATE32 0xF
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typedef struct {
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uint16_t limit;
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uint32_t base;
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} __attribute__((packed)) idtr_t;
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typedef struct {
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uint16_t isr_low; // lower 16-bits of ISR address
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uint16_t kernel_cs; // The GDT selector that the CPU will load into CS before calling ISR
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uint8_t reserved; // set to zero
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uint8_t flags; // Type and attributes
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uint16_t isr_high; // Higher 16-bits of ISR address
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} __attribute__((packed)) idt_entry_t;
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typedef struct {
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uint32_t offset;
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uint16_t segment;
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uint8_t gate;
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uint8_t ring;
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} idt;
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typedef struct {
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uint32_t ip;
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uint32_t cs;
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uint32_t flags;
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uint32_t sp;
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uint32_t ss;
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} __attribute__((packed)) idt_frame;
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typedef struct {
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uint32_t err;
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uint32_t ip;
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uint32_t cs;
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uint32_t flags;
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uint32_t sp;
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uint32_t ss;
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} __attribute__((packed)) idt_frame_err;
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extern void idt_load();
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extern idtr_t idtptr;
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#endif |