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#ifndef _HEAD_H
#define _HEAD_H
typedef struct desc_struct {
unsigned long a,b;
} desc_table[256];
extern unsigned long pg_dir[1024];
extern desc_table idt,gdt;
#define GDT_NUL 0
#define GDT_CODE 1
#define GDT_DATA 2
#define GDT_TMP 3
#define LDT_NUL 0
#define LDT_CODE 1
#define LDT_DATA 2
#endif
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