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[MEMORY] GDT

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This commit is contained in:
Thomas Lovén
2017-01-26 09:02:33 +01:00
parent deb1f031ce
commit 1f06c0bcf1
4 changed files with 69 additions and 17 deletions
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27
kernel/include/gdt.h
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@@ -1,12 +1,37 @@
#pragma once
#define SEG_KCODE 0x08
#define SEG_KDATA 0x10
#define SEG_UDATA 0x18
#define SEG_UCODE 0x20
#ifdef __ASSEMBLER__
#define GDT_WRITE (1<<41)
#define GDT_EXECUTE (1<<43)
#define GDT_CODEDATA (1<<44)
#define GDT_PRESENT (1<<47)
#define GDT_64BIT (1<<53)
#else
#define GDT_WRITE (1LL<<41)
#define GDT_EXECUTE (1LL<<43)
#define GDT_CODEDATA (1LL<<44)
#define GDT_PRESENT (1LL<<47)
#define GDT_64BIT (1LL<<53)
#define GDT_RING3 (3LL<<45)
#define GDT_TSS (9LL<<40)
#ifndef __ASSEMBLER__
#include <stdint.h>
extern uint64_t BootGDT;
struct gdtp_st
{
uint16_t len;
uint64_t addr;
uint16_t pad1;
uint32_t pad2;
}__attribute__((packed));
void load_gdt(struct gdtp_st *);
void gdt_init();
#endif