user_ldt.h

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    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_ */

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FreeBSD/Linux Kernel Cross Reference sys/i386/user_ldt.h

FreeBSD/Linux Kernel Cross Reference
sys/i386/user_ldt.h