1/*
2 * Copyright (c) 2000-2008 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28/*
29 * @OSF_COPYRIGHT@
30 */
31/*
32 * Mach Operating System
33 * Copyright (c) 1991 Carnegie Mellon University
34 * All Rights Reserved.
35 *
36 * Permission to use, copy, modify and distribute this software and its
37 * documentation is hereby granted, provided that both the copyright
38 * notice and this permission notice appear in all copies of the
39 * software, derivative works or modified versions, and any portions
40 * thereof, and that both notices appear in supporting documentation.
41 *
42 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
43 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
44 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
45 *
46 * Carnegie Mellon requests users of this software to return to
47 *
48 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
49 *  School of Computer Science
50 *  Carnegie Mellon University
51 *  Pittsburgh PA 15213-3890
52 *
53 * any improvements or extensions that they make and grant Carnegie Mellon
54 * the rights to redistribute these changes.
55 */
56
57/*
58 */
59
60#ifndef	_I386_USER_LDT_H_
61#define	_I386_USER_LDT_H_
62
63/*
64 * User LDT management.
65 *
66 * Each task may have its own LDT.
67 */
68
69#define	LDT_AUTO_ALLOC	0xffffffff
70
71#ifdef KERNEL
72#include <i386/seg.h>
73
74struct user_ldt {
75	unsigned int start;		/* first descriptor in table */
76	unsigned int count;		/* how many descriptors in table */
77	struct real_descriptor	ldt[0];	/* descriptor table (variable) */
78};
79typedef struct user_ldt *	user_ldt_t;
80
81extern user_ldt_t	user_ldt_copy(
82			user_ldt_t	uldt);
83extern void	user_ldt_free(
84			user_ldt_t	uldt);
85extern void	user_ldt_set(
86			thread_t	thread);
87#else /* !KERNEL */
88#include <sys/cdefs.h>
89
90union ldt_entry;
91
92__BEGIN_DECLS
93int i386_get_ldt(int, union ldt_entry *, int);
94int i386_set_ldt(int, const union ldt_entry *, int);
95__END_DECLS
96#endif /* KERNEL */
97
98#endif	/* _I386_USER_LDT_H_ */
99