ldt.c

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    1 /*
    2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
    3  *
    4  * @APPLE_LICENSE_HEADER_START@
    5  * 
    6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
    7  * 
    8  * This file contains Original Code and/or Modifications of Original Code
    9  * as defined in and that are subject to the Apple Public Source License
   10  * Version 2.0 (the 'License'). You may not use this file except in
   11  * compliance with the License. Please obtain a copy of the License at
   12  * http://www.opensource.apple.com/apsl/ and read it before using this
   13  * file.
   14  * 
   15  * The Original Code and all software distributed under the License are
   16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
   17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
   18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
   19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
   20  * Please see the License for the specific language governing rights and
   21  * limitations under the License.
   22  * 
   23  * @APPLE_LICENSE_HEADER_END@
   24  */
   25 /*
   26  * @OSF_COPYRIGHT@
   27  */
   28 /* 
   29  * Mach Operating System
   30  * Copyright (c) 1991,1990 Carnegie Mellon University
   31  * All Rights Reserved.
   32  * 
   33  * Permission to use, copy, modify and distribute this software and its
   34  * documentation is hereby granted, provided that both the copyright
   35  * notice and this permission notice appear in all copies of the
   36  * software, derivative works or modified versions, and any portions
   37  * thereof, and that both notices appear in supporting documentation.
   38  * 
   39  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   40  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
   41  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   42  * 
   43  * Carnegie Mellon requests users of this software to return to
   44  * 
   45  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   46  *  School of Computer Science
   47  *  Carnegie Mellon University
   48  *  Pittsburgh PA 15213-3890
   49  * 
   50  * any improvements or extensions that they make and grant Carnegie Mellon
   51  * the rights to redistribute these changes.
   52  */
   53 /*
   54  */
   55 
   56 /*
   57  * "Local" descriptor table.  At the moment, all tasks use the
   58  * same LDT.
   59  */
   60 #include <i386/seg.h>
   61 #include <mach/i386/vm_types.h>
   62 #include <mach/i386/vm_param.h>
   63 
   64 extern int      syscall(void);
   65 extern int      mach_rpc(void);
   66 
   67 struct fake_descriptor  ldt[LDTSZ] = {
   68 /*007*/ { (unsigned int)&syscall,
   69           KERNEL_CS,
   70           0,                            /* no parameters */
   71           ACC_P|ACC_PL_U|ACC_CALL_GATE
   72         },                              /* call gate for system calls */
   73 /*00F*/ { (unsigned int)&mach_rpc,
   74           KERNEL_CS,
   75           0,                            /* no parameters */
   76           ACC_P|ACC_PL_U|ACC_CALL_GATE
   77         },                              /* call gate for mach rpc */
   78 /*017*/ { 0,
   79           (VM_MAX_ADDRESS-VM_MIN_ADDRESS-1)>>12,
   80           SZ_32|SZ_G,
   81           ACC_P|ACC_PL_U|ACC_CODE_R
   82         },                              /* user code segment */
   83 /*01F*/ { 0,
   84           (VM_MAX_ADDRESS-VM_MIN_ADDRESS-1)>>12,
   85           SZ_32|SZ_G,
   86           ACC_P|ACC_PL_U|ACC_DATA_W
   87         },                              /* user data segment */
   88 /*027*/ { 0,
   89           (VM_MAX_ADDRESS-VM_MIN_ADDRESS-1)>>12,
   90           SZ_32|SZ_G,
   91           ACC_P|ACC_PL_U|ACC_DATA_W
   92         },                              /* user cthread segment */
   93 };

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

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