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Annotation of XNU/osfmk/i386/ldt.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
                      3:  *
                      4:  * @APPLE_LICENSE_HEADER_START@
                      5:  * 
                      6:  * The contents of this file constitute Original Code as defined in and
                      7:  * are subject to the Apple Public Source License Version 1.1 (the
                      8:  * "License").  You may not use this file except in compliance with the
                      9:  * License.  Please obtain a copy of the License at
                     10:  * http://www.apple.com/publicsource and read it before using this file.
                     11:  * 
                     12:  * This Original Code and all software distributed under the License are
                     13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
                     14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
                     15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
                     16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
                     17:  * License for the specific language governing rights and limitations
                     18:  * under the License.
                     19:  * 
                     20:  * @APPLE_LICENSE_HEADER_END@
                     21:  */
                     22: /*
                     23:  * @OSF_COPYRIGHT@
                     24:  */
                     25: /* 
                     26:  * Mach Operating System
                     27:  * Copyright (c) 1991,1990 Carnegie Mellon University
                     28:  * All Rights Reserved.
                     29:  * 
                     30:  * Permission to use, copy, modify and distribute this software and its
                     31:  * documentation is hereby granted, provided that both the copyright
                     32:  * notice and this permission notice appear in all copies of the
                     33:  * software, derivative works or modified versions, and any portions
                     34:  * thereof, and that both notices appear in supporting documentation.
                     35:  * 
                     36:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
                     37:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
                     38:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
                     39:  * 
                     40:  * Carnegie Mellon requests users of this software to return to
                     41:  * 
                     42:  *  Software Distribution Coordinator  or  [email protected]
                     43:  *  School of Computer Science
                     44:  *  Carnegie Mellon University
                     45:  *  Pittsburgh PA 15213-3890
                     46:  * 
                     47:  * any improvements or extensions that they make and grant Carnegie Mellon
                     48:  * the rights to redistribute these changes.
                     49:  */
                     50: /*
                     51:  */
                     52: 
                     53: /*
                     54:  * "Local" descriptor table.  At the moment, all tasks use the
                     55:  * same LDT.
                     56:  */
                     57: #include <i386/seg.h>
                     58: #include <mach/i386/vm_types.h>
                     59: #include <mach/i386/vm_param.h>
                     60: 
                     61: extern int     syscall(void);
                     62: extern int     mach_rpc(void);
                     63: 
                     64: struct fake_descriptor ldt[LDTSZ] = {
                     65: /*007*/        { (unsigned int)&syscall,
                     66:          KERNEL_CS,
                     67:          0,                            /* no parameters */
                     68:          ACC_P|ACC_PL_U|ACC_CALL_GATE
                     69:        },                              /* call gate for system calls */
                     70: /*00F*/        { (unsigned int)&mach_rpc,
                     71:           KERNEL_CS,
                     72:           0,                            /* no parameters */
                     73:           ACC_P|ACC_PL_U|ACC_CALL_GATE
                     74:         },                             /* call gate for mach rpc */
                     75: /*017*/        { 0,
                     76:          (VM_MAX_ADDRESS-VM_MIN_ADDRESS-1)>>12,
                     77:          SZ_32|SZ_G,
                     78:          ACC_P|ACC_PL_U|ACC_CODE_R
                     79:        },                              /* user code segment */
                     80: /*01F*/        { 0,
                     81:          (VM_MAX_ADDRESS-VM_MIN_ADDRESS-1)>>12,
                     82:          SZ_32|SZ_G,
                     83:          ACC_P|ACC_PL_U|ACC_DATA_W
                     84:        },                              /* user data segment */
                     85: };

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