43 lines
872 B
C
43 lines
872 B
C
#ifndef SOCKS_X86_64__GDT_H_
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#define SOCKS_X86_64__GDT_H_
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#include <socks/compiler.h>
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#include <stdint.h>
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#define NR_GDT_ENTRIES 5
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#define GDT_A_PRESENT (1 << 7)
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#define GDT_A_USER (3 << 5)
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#define GDT_A_CODE (3 << 3)
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#define GDT_A_DATA (8 << 1)
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#define GDT_A_RPLK (1 << 5)
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#define GDT_A_CODEREAD (1 << 1)
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#define GDT_A_DATAWRITE (1 << 1)
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#define GDT_A_GROWUP (1 << 5)
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#define GDT_F_64BIT (0x2F)
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#define GDT_F_32BIT (0x4F)
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#define GDT_F_16BIT (0xF)
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struct gdt_entry {
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uint16_t ge_limit_low;
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uint16_t ge_base_low;
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uint8_t ge_base_mid;
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uint8_t ge_access;
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uint8_t ge_gran;
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uint8_t ge_base_hi;
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} __packed;
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struct gdt {
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struct gdt_entry g_entries[NR_GDT_ENTRIES];
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} __packed;
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struct gdt_ptr {
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uint16_t g_limit;
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uint64_t g_ptr;
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} __packed;
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extern int gdt_init(struct gdt *gdt, struct gdt_ptr *gdtp);
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extern int gdt_load(struct gdt_ptr *gdtp);
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#endif
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