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01: /*
02:  * ldt.h
03:  *
04:  * Definitions of structures used with the modify_ldt system call.
05:  */
06: #ifndef _ASM_X86_LDT_H
07: #define _ASM_X86_LDT_H
08: 
09: /* 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__ */
40: #endif /* _ASM_X86_LDT_H */
41: 

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