blob: 04b8ab21328faed255f2cfca4d02f267c9fd5fb3 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _ASM_SEGMENT_H
2#define _ASM_SEGMENT_H
3
4#include <asm/cache.h>
5
H. Peter Anvin8afd2af2007-07-11 12:18:37 -07006/* Simple and small GDT entries for booting only */
7
8#define GDT_ENTRY_BOOT_CS 2
9#define __BOOT_CS (GDT_ENTRY_BOOT_CS * 8)
10
11#define GDT_ENTRY_BOOT_DS (GDT_ENTRY_BOOT_CS + 1)
12#define __BOOT_DS (GDT_ENTRY_BOOT_DS * 8)
13
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#define __KERNEL_CS 0x10
15#define __KERNEL_DS 0x18
16
Vivek Goyal30f47282007-05-02 19:27:07 +020017#define __KERNEL32_CS 0x08
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
19/*
20 * we cannot use the same code segment descriptor for user and kernel
21 * -- not even in the long flat mode, because of different DPL /kkeil
22 * The segment offset needs to contain a RPL. Grr. -AK
23 * GDT layout to get 64bit syscall right (sysret hardcodes gdt offsets)
24 */
25
26#define __USER32_CS 0x23 /* 4*8+3 */
27#define __USER_DS 0x2b /* 5*8+3 */
28#define __USER_CS 0x33 /* 6*8+3 */
29#define __USER32_DS __USER_DS
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#define GDT_ENTRY_TSS 8 /* needs two entries */
32#define GDT_ENTRY_LDT 10 /* needs two entries */
33#define GDT_ENTRY_TLS_MIN 12
34#define GDT_ENTRY_TLS_MAX 14
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36#define GDT_ENTRY_TLS_ENTRIES 3
37
Vojtech Pavlikc08c8202006-09-26 10:52:28 +020038#define GDT_ENTRY_PER_CPU 15 /* Abused to load per CPU data from limit */
39#define __PER_CPU_SEG (GDT_ENTRY_PER_CPU * 8 + 3)
40
Linus Torvalds1da177e2005-04-16 15:20:36 -070041/* TLS indexes for 64bit - hardcoded in arch_prctl */
42#define FS_TLS 0
43#define GS_TLS 1
44
45#define GS_TLS_SEL ((GDT_ENTRY_TLS_MIN+GS_TLS)*8 + 3)
46#define FS_TLS_SEL ((GDT_ENTRY_TLS_MIN+FS_TLS)*8 + 3)
47
48#define IDT_ENTRIES 256
49#define GDT_ENTRIES 16
50#define GDT_SIZE (GDT_ENTRIES * 8)
51#define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8)
52
53#endif