ldt.c

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1991,1990 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  * HISTORY
   28  * $Log:        ldt.c,v $
   29  * Revision 2.5  91/05/14  16:10:48  mrt
   30  *      Correcting copyright
   31  * 
   32  * Revision 2.4  91/02/05  17:12:45  mrt
   33  *      Changed to new Mach copyright
   34  *      [91/02/01  17:35:36  mrt]
   35  * 
   36  * Revision 2.3  90/08/27  21:57:15  dbg
   37  *      Use new segment definitions.
   38  *      [90/07/25            dbg]
   39  * 
   40  * Revision 2.2  90/05/03  15:33:38  dbg
   41  *      Created.
   42  *      [90/02/15            dbg]
   43  * 
   44  */
   45 
   46 /*
   47  * "Local" descriptor table.  At the moment, all tasks use the
   48  * same LDT.
   49  */
   50 #include <i386/seg.h>
   51 #include <mach/i386/vm_types.h>
   52 #include <mach/i386/vm_param.h>
   53 
   54 extern int      syscall();
   55 
   56 struct fake_descriptor  ldt[LDTSZ] = {
   57 /*007*/ { (unsigned int)&syscall,
   58           KERNEL_CS,
   59           0,                            /* no parameters */
   60           ACC_P|ACC_PL_U|ACC_CALL_GATE
   61         },                              /* call gate for system calls */
   62 /*00F*/ { 0, 0, 0, 0 },                 /* unused */
   63 /*017*/ { 0,
   64           (VM_MAX_ADDRESS-VM_MIN_ADDRESS-1)>>12,
   65           SZ_32|SZ_G,
   66           ACC_P|ACC_PL_U|ACC_CODE_R
   67         },                              /* user code segment */
   68 /*01F*/ { 0,
   69           (VM_MAX_ADDRESS-VM_MIN_ADDRESS-1)>>12,
   70           SZ_32|SZ_G,
   71           ACC_P|ACC_PL_U|ACC_DATA_W
   72         },                              /* user data segment */
   73 };

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FreeBSD/Linux Kernel Cross Reference sys/i386/ldt.c

FreeBSD/Linux Kernel Cross Reference
sys/i386/ldt.c