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26 * Mach Operating System
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54 #ifndef _I386_USER_LDT_H_
55 #define _I386_USER_LDT_H_
58 * User LDT management.
60 * Each thread in a task may have its own LDT.
66 struct real_descriptor desc
; /* descriptor for self */
67 struct real_descriptor ldt
[1]; /* descriptor table (variable) */
69 typedef struct user_ldt
* user_ldt_t
;
72 * Check code/stack/data selector values against LDT if present.
74 #define S_CODE 0 /* code segment */
75 #define S_STACK 1 /* stack segment */
76 #define S_DATA 2 /* data segment */
78 extern boolean_t
selector_check(
82 extern void user_ldt_free(
85 #endif /* _I386_USER_LDT_H_ */