FreeBSD/Linux Kernel Cross Reference
sys/i386/user_ldt.h
1 /*
2 * Mach Operating System
3 * Copyright (c) 1991 Carnegie Mellon University
4 * All Rights Reserved.
5 *
6 * Permission to use, copy, modify and distribute this software and its
7 * documentation is hereby granted, provided that both the copyright
8 * notice and this permission notice appear in all copies of the
9 * software, derivative works or modified versions, and any portions
10 * thereof, and that both notices appear in supporting documentation.
11 *
12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
15 *
16 * Carnegie Mellon requests users of this software to return to
17 *
18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
19 * School of Computer Science
20 * Carnegie Mellon University
21 * Pittsburgh PA 15213-3890
22 *
23 * any improvements or extensions that they make and grant Carnegie Mellon
24 * the rights to redistribute these changes.
25 */
26
27 /*
28 * HISTORY
29 * $Log: user_ldt.h,v $
30 * Revision 2.2 92/01/03 20:10:08 dbg
31 * Created.
32 * [91/08/20 dbg]
33 *
34 */
35
36 #ifndef _I386_USER_LDT_H_
37 #define _I386_USER_LDT_H_
38
39 /*
40 * User LDT management.
41 *
42 * Each thread in a task may have its own LDT.
43 */
44
45 #include <i386/seg.h>
46
47 struct user_ldt {
48 struct real_descriptor desc; /* descriptor for self */
49 struct real_descriptor ldt[1]; /* descriptor table (variable) */
50 };
51 typedef struct user_ldt * user_ldt_t;
52
53 /*
54 * Check code/stack/data selector values against LDT if present.
55 */
56 #define S_CODE 0 /* code segment */
57 #define S_STACK 1 /* stack segment */
58 #define S_DATA 2 /* data segment */
59
60 extern boolean_t selector_check(/* thread_t thread,
61 int sel,
62 int type */);
63
64 #endif /* _I386_USER_LDT_H_ */
Cache object: 0ce4ee9fdf69bde5853f6ef0fd0932bb
|