ldt.h revision 0437c52788a98ab8ea84041c6b1f8d7a93e872f6 
1/*
2 * ldt.h
3 *
4 * Definitions of structures used with the modify_ldt system call.
5 */
6#ifndef _ASM_X86_LDT_H
7#define _ASM_X86_LDT_H
8
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__ */
40#endif /* _ASM_X86_LDT_H */
41