70 lines
2.2 KiB
C
70 lines
2.2 KiB
C
#ifndef X86_64_INTERRUPT_H
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#define X86_64_INTERRUPT_H 1
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#include <types.h>
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#include <utils.h>
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/**
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* @name gate_descriptor_t
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* @addindex 平台依赖结构 x86_64
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*
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* 门描述符的结构体形式。
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*/
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typedef struct __gate_descriptor_t
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{
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u16 offset_01;
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u16 segment_selector; // for code segment
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u16 flags;
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u16 offset_23;
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u32 offset_4567;
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u32 reserved;
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} DISALIGNED gate_descriptor_t;
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/**
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* @name INTERRUPT_DESCRIPTOR_FLAG_IST
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* @addindex 平台依赖结构 x86_64
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*
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* `gate_descriptor_t`的`flags`的标志位。
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*
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* `ssp`代表一个tss描述符在任务段中的的索引。
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*/
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#define INTERRUPT_DESCRIPTOR_FLAG_IST 1
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// 在第15位上有一个表示代码段是否存在的标志位，代码段总是存在，故直接设置为1
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#define INTERRUPT_DESCRIPTOR_FLAG_TYPE_INTERRUPT (0x8e << 8)
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#define INTERRUPT_DESCRIPTOR_FLAG_TYPE_TRAP (0x8f << 8)
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/**
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* @name idt
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*
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* 中断描述符表。
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*/
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extern gate_descriptor_t idt[256];
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#define interrupt_gate_generate(desc, addr) \
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{ \
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(desc).segment_selector = 0x8; \
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(desc).flags = INTERRUPT_DESCRIPTOR_FLAG_TYPE_INTERRUPT | \
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INTERRUPT_DESCRIPTOR_FLAG_IST; \
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(desc).reserved = 0; \
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(desc).offset_01 = (u16)((u64)(addr)); \
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(desc).offset_23 = (u16)(((u64)(addr)) >> 16); \
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(desc).offset_4567 = (u32)(((u64)(addr)) >> 32); \
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}
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#define trap_gate_generate(desc, addr) \
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{ \
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(desc).segment_selector = 0x8; \
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(desc).flags = INTERRUPT_DESCRIPTOR_FLAG_TYPE_TRAP | \
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INTERRUPT_DESCRIPTOR_FLAG_IST; \
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(desc).reserved = 0; \
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(desc).offset_01 = (u16)((u64)(addr)); \
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(desc).offset_23 = (u16)(((u64)(addr)) >> 16); \
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(desc).offset_4567 = (u32)(((u64)(addr)) >> 32); \
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}
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#define interrupt_register_gate(desc, index) \
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idt[index] = desc;
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#endif
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