Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1#ifndef _ASM_SEGMENT_H
2#define _ASM_SEGMENT_H
3
4#include <asm/cache.h>
5
6#define __KERNEL_CS 0x10
7#define __KERNEL_DS 0x18
8
9#define __KERNEL32_CS 0x38
10
11/*
12 * we cannot use the same code segment descriptor for user and kernel
13 * -- not even in the long flat mode, because of different DPL /kkeil
14 * The segment offset needs to contain a RPL. Grr. -AK
15 * GDT layout to get 64bit syscall right (sysret hardcodes gdt offsets)
16 */
17
18#define __USER32_CS 0x23 /* 4*8+3 */
19#define __USER_DS 0x2b /* 5*8+3 */
20#define __USER_CS 0x33 /* 6*8+3 */
21#define __USER32_DS __USER_DS
22#define __KERNEL16_CS (GDT_ENTRY_KERNELCS16 * 8)
23#define __KERNEL_COMPAT32_CS 0x8
24
25#define GDT_ENTRY_TLS 1
26#define GDT_ENTRY_TSS 8 /* needs two entries */
27#define GDT_ENTRY_LDT 10 /* needs two entries */
28#define GDT_ENTRY_TLS_MIN 12
29#define GDT_ENTRY_TLS_MAX 14
30#define GDT_ENTRY_KERNELCS16 15
31
32#define GDT_ENTRY_TLS_ENTRIES 3
33
34/* TLS indexes for 64bit - hardcoded in arch_prctl */
35#define FS_TLS 0
36#define GS_TLS 1
37
38#define GS_TLS_SEL ((GDT_ENTRY_TLS_MIN+GS_TLS)*8 + 3)
39#define FS_TLS_SEL ((GDT_ENTRY_TLS_MIN+FS_TLS)*8 + 3)
40
41#define IDT_ENTRIES 256
42#define GDT_ENTRIES 16
43#define GDT_SIZE (GDT_ENTRIES * 8)
44#define TLS_SIZE (GDT_ENTRY_TLS_ENTRIES * 8)
45
46#endif