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Thomas Gleixnerf6a2e7f2007-10-17 18:04:40 +02001/*
2 * ldt.h
3 *
4 * Definitions of structures used with the modify_ldt system call.
5 */
H. Peter Anvin1965aae2008-10-22 22:26:29 -07006#ifndef _ASM_X86_LDT_H
7#define _ASM_X86_LDT_H
Thomas Gleixnerf6a2e7f2007-10-17 18:04:40 +02008
9/* Maximum number of LDT entries supported. */
10#define LDT_ENTRIES 8192
11/* The size of each LDT entry. */
12#define LDT_ENTRY_SIZE 8
13
14#ifndef __ASSEMBLY__
15/*
16 * Note on 64bit base and limit is ignored and you cannot set DS/ES/CS
17 * not to the default values if you still want to do syscalls. This
18 * call is more for 32bit mode therefore.
19 */
20struct user_desc {
21 unsigned int entry_number;
22 unsigned int base_addr;
23 unsigned int limit;
24 unsigned int seg_32bit:1;
25 unsigned int contents:2;
26 unsigned int read_exec_only:1;
27 unsigned int limit_in_pages:1;
28 unsigned int seg_not_present:1;
29 unsigned int useable:1;
30#ifdef __x86_64__
31 unsigned int lm:1;
32#endif
33};
34
35#define MODIFY_LDT_CONTENTS_DATA 0
36#define MODIFY_LDT_CONTENTS_STACK 1
37#define MODIFY_LDT_CONTENTS_CODE 2
38
39#endif /* !__ASSEMBLY__ */
H. Peter Anvin1965aae2008-10-22 22:26:29 -070040#endif /* _ASM_X86_LDT_H */