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