osfmk/i386/user_ldt.h

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