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28 lines
532 B
C
28 lines
532 B
C
#include <stdint.h>
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#ifndef GDT_H
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#define GDT_H
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typedef struct GDTEntry {
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uint16_t limit;
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uint16_t base_low;
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uint16_t base_mid;
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uint8_t base_high;
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uint8_t access;
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uint8_t granularity;
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} __attribute__((packed)) GDTEntry;
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typedef struct GDTPtr {
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uint16_t limit;
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uint64_t base;
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} __attribute__((packed)) GDTPtr;
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#define GDT_NUM_ENTRIES 5 /* including null descriptor */
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#define GDT_KERNEL_CODE 0x08
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#define GDT_KERNEL_DATA 0x10
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#define GDT_USER_CODE 0x18
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#define GDT_USER_DATA 0x20
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void initGDT();
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#endif /* GDT_H */
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