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f6a2e7f2 TG |
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 | */ | |
20 | struct 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__ */ | |
96a388de | 40 | #endif |