45 lines
1.0 KiB
C
45 lines
1.0 KiB
C
#pragma once
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#include "stdint.h"
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#define IDT_NUM 256
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#define RING_0 0
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#define RING_1 1
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#define RING_2 2
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#define RING_3 3
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#define SEGMENT_IDX_NULL 0
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#define SEGMENT_IDX_CODE 1
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#define SEGMENT_IDX_DATA 2
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struct idtEntry {
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uint16_t offset_low;
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uint16_t seg_sel;
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uint8_t reserved : 5;
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uint8_t flags : 3;
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uint8_t type : 3;
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uint8_t op_size : 1;
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uint8_t zero : 1;
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uint8_t dpl : 2;
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uint8_t present : 1;
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uint16_t offset_high;
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} __attribute__((packed));
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/**
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* The IDT register, which stores the address and size of the
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* IDT.
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*
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* @see Intel x86 doc vol 3, section 2.4, figure 2-4
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*/
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struct idtRegister {
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uint16_t limit;
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uint32_t base_addr;
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} __attribute__((packed, aligned(8)));
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/* Build segment http://wiki.osdev.org/Selector*/
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#define BUILD_SEGMENT_SELECTOR(desc_privilege, in_ldt, index) \
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((((desc_privilege)&0x3) << 0) | (((in_ldt) ? 1 : 0) << 2) | ((index) << 3))
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int idtSetup();
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int idt_set_handler(int index, unsigned int addr, int priviledge);
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