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Annotation of Net2/arch/i386/boot/table.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Ported to boot 386BSD by Julian Elischer ([email protected]) Sept 1992
        !             3:  *
        !             4:  * Mach Operating System
        !             5:  * Copyright (c) 1992, 1991 Carnegie Mellon University
        !             6:  * All Rights Reserved.
        !             7:  * 
        !             8:  * Permission to use, copy, modify and distribute this software and its
        !             9:  * documentation is hereby granted, provided that both the copyright
        !            10:  * notice and this permission notice appear in all copies of the
        !            11:  * software, derivative works or modified versions, and any portions
        !            12:  * thereof, and that both notices appear in supporting documentation.
        !            13:  * 
        !            14:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            15:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            16:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            17:  * 
        !            18:  * Carnegie Mellon requests users of this software to return to
        !            19:  * 
        !            20:  *  Software Distribution Coordinator  or  [email protected]
        !            21:  *  School of Computer Science
        !            22:  *  Carnegie Mellon University
        !            23:  *  Pittsburgh PA 15213-3890
        !            24:  * 
        !            25:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            26:  * the rights to redistribute these changes.
        !            27:  */
        !            28: 
        !            29: /*
        !            30:  * HISTORY
        !            31:  * $Log: table.c,v $
        !            32:  * Revision 1.1  1993/03/21 18:08:47  cgd
        !            33:  * after 0.2.2 "stable" patches applied
        !            34:  *
        !            35:  * Revision 2.2  92/04/04  11:36:43  rpd
        !            36:  *     Fix Intel Copyright as per B. Davies authorization.
        !            37:  *     [92/04/03            rvb]
        !            38:  *     Taken from 2.5 bootstrap.
        !            39:  *     [92/03/30            rvb]
        !            40:  * 
        !            41:  * Revision 2.2  91/04/02  14:42:22  mbj
        !            42:  *     Add Intel copyright
        !            43:  *     [90/02/09            rvb]
        !            44:  * 
        !            45:  */
        !            46: 
        !            47: /*
        !            48:   Copyright 1988, 1989, 1990, 1991, 1992 
        !            49:    by Intel Corporation, Santa Clara, California.
        !            50: 
        !            51:                 All Rights Reserved
        !            52: 
        !            53: Permission to use, copy, modify, and distribute this software and
        !            54: its documentation for any purpose and without fee is hereby
        !            55: granted, provided that the above copyright notice appears in all
        !            56: copies and that both the copyright notice and this permission notice
        !            57: appear in supporting documentation, and that the name of Intel
        !            58: not be used in advertising or publicity pertaining to distribution
        !            59: of the software without specific, written prior permission.
        !            60: 
        !            61: INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
        !            62: INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
        !            63: IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
        !            64: CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
        !            65: LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
        !            66: NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
        !            67: WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
        !            68: */
        !            69: 
        !            70: #define NGDTENT                6
        !            71: #define GDTLIMIT       48      /* NGDTENT * 8 */
        !            72: 
        !            73: /*  Segment Descriptor
        !            74:  *
        !            75:  * 31          24         19   16                 7           0
        !            76:  * ------------------------------------------------------------
        !            77:  * |             | |B| |A|       | |   |1|0|E|W|A|            |
        !            78:  * | BASE 31..24 |G|/|0|V| LIMIT |P|DPL|  TYPE   | BASE 23:16 |
        !            79:  * |             | |D| |L| 19..16| |   |1|1|C|R|A|            |
        !            80:  * ------------------------------------------------------------
        !            81:  * |                             |                            |
        !            82:  * |        BASE 15..0           |       LIMIT 15..0          |
        !            83:  * |                             |                            |
        !            84:  * ------------------------------------------------------------
        !            85:  */
        !            86: 
        !            87: struct seg_desc {
        !            88:        unsigned short  limit_15_0;
        !            89:        unsigned short  base_15_0;
        !            90:        unsigned char   base_23_16;
        !            91:        unsigned char   bit_15_8;
        !            92:        unsigned char   bit_23_16;
        !            93:        unsigned char   base_31_24;
        !            94:        };
        !            95: 
        !            96: 
        !            97: struct seg_desc        Gdt[NGDTENT] = {
        !            98:        {0x0, 0x0, 0x0, 0x0, 0x0, 0x0},         /* 0x0 : null */
        !            99:        {0xFFFF, 0x0, 0x0, 0x9F, 0xCF, 0x0},    /* 0x08 : kernel code */
        !           100:        {0xFFFF, 0x0, 0x0, 0x93, 0xCF, 0x0},    /* 0x10 : kernel data */
        !           101:        {0xFFFF, 0x0000, 0x9, 0x9E, 0x40, 0x0}, /* 0x18 : boot code */
        !           102:        {0xFFFF, 0x0000, 0x9, 0x92, 0x40, 0x0}, /* 0x20 : boot data */
        !           103:        {0xFFFF, 0x0000, 0x9, 0x9E, 0x0, 0x0}   /* 0x28 : boot code, 16 bits */
        !           104:        };
        !           105: 
        !           106: 
        !           107: struct pseudo_desc {
        !           108:        unsigned short  limit;
        !           109:        unsigned short  base_low;
        !           110:        unsigned short  base_high;
        !           111:        };
        !           112: 
        !           113: struct pseudo_desc Gdtr = { GDTLIMIT, 0x0400, 9 };
        !           114: struct pseudo_desc Gdtr2 = { GDTLIMIT, 0xfe00, 9 };
        !           115:                        /* boot is loaded at 0x90000, Gdt is at boot+1024 */

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