Return to desc.h CVS log

Up to [Apple XNU] / XNU / EXTERNAL_HEADERS / architecture / i386

Annotation of XNU/EXTERNAL_HEADERS/architecture/i386/desc.h, 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:  * Copyright (c) 1992 NeXT Computer, Inc.
        !            24:  *
        !            25:  * Intel386 Family:    Segment descriptors.
        !            26:  *
        !            27:  * HISTORY
        !            28:  *
        !            29:  * 29 March 1992 ? at NeXT
        !            30:  *     Created.
        !            31:  */
        !            32:  
        !            33: /*
        !            34:  * Code segment descriptor.
        !            35:  */
        !            36: 
        !            37: typedef struct code_desc {
        !            38:     unsigned short     limit00;
        !            39:     unsigned short     base00;
        !            40:     unsigned char      base16;
        !            41:     unsigned char      type    :5,
        !            42: #define DESC_CODE_EXEC 0x18
        !            43: #define DESC_CODE_READ 0x1a
        !            44:                        dpl     :2,
        !            45:                        present :1;
        !            46:     unsigned char      limit16 :4,
        !            47:                                :2,
        !            48:                        opsz    :1,
        !            49: #define DESC_CODE_16B  0
        !            50: #define DESC_CODE_32B  1
        !            51:                        granular:1;
        !            52: #define DESC_GRAN_BYTE 0
        !            53: #define DESC_GRAN_PAGE 1
        !            54:     unsigned char      base24;
        !            55: } code_desc_t;
        !            56:  
        !            57: /*
        !            58:  * Data segment descriptor.
        !            59:  */
        !            60: 
        !            61: typedef struct data_desc {
        !            62:     unsigned short     limit00;
        !            63:     unsigned short     base00;
        !            64:     unsigned char      base16;
        !            65:     unsigned char      type    :5,
        !            66: #define DESC_DATA_RONLY        0x10
        !            67: #define DESC_DATA_WRITE        0x12
        !            68:                        dpl     :2,
        !            69:                        present :1;
        !            70:     unsigned char      limit16 :4,
        !            71:                                :2,
        !            72:                        stksz   :1,
        !            73: #define DESC_DATA_16B  0
        !            74: #define DESC_DATA_32B  1
        !            75:                        granular:1;
        !            76:     unsigned char      base24;
        !            77: } data_desc_t;
        !            78: 
        !            79: /*
        !            80:  * LDT segment descriptor.
        !            81:  */
        !            82: 
        !            83: typedef struct ldt_desc {
        !            84:     unsigned short     limit00;
        !            85:     unsigned short     base00;
        !            86:     unsigned char      base16;
        !            87:     unsigned char      type    :5,
        !            88: #define DESC_LDT       0x02
        !            89:                                :2,
        !            90:                        present :1;
        !            91:     unsigned char      limit16 :4,
        !            92:                                :3,
        !            93:                        granular:1;
        !            94:     unsigned char      base24;
        !            95: } ldt_desc_t;
        !            96: 
        !            97: #import <architecture/i386/sel.h>
        !            98: 
        !            99: /*
        !           100:  * Call gate descriptor.
        !           101:  */
        !           102:  
        !           103: typedef struct call_gate {
        !           104:     unsigned short     offset00;
        !           105:     sel_t              seg;
        !           106:     unsigned int       argcnt  :5,
        !           107:                                :3,
        !           108:                        type    :5,
        !           109: #define DESC_CALL_GATE 0x0c
        !           110:                        dpl     :2,
        !           111:                        present :1,
        !           112:                        offset16:16;
        !           113: } call_gate_t;
        !           114: 
        !           115: /*
        !           116:  * Trap gate descriptor.
        !           117:  */
        !           118:  
        !           119: typedef struct trap_gate {
        !           120:     unsigned short     offset00;
        !           121:     sel_t              seg;
        !           122:     unsigned int               :8,
        !           123:                        type    :5,
        !           124: #define DESC_TRAP_GATE 0x0f
        !           125:                        dpl     :2,
        !           126:                        present :1,
        !           127:                        offset16:16;
        !           128: } trap_gate_t;
        !           129: 
        !           130: 
        !           131: /*
        !           132:  * Interrupt gate descriptor.
        !           133:  */
        !           134:  
        !           135: typedef struct intr_gate {
        !           136:     unsigned short     offset00;
        !           137:     sel_t              seg;
        !           138:     unsigned int               :8,
        !           139:                        type    :5,
        !           140: #define DESC_INTR_GATE 0x0e
        !           141:                        dpl     :2,
        !           142:                        present :1,
        !           143:                        offset16:16;
        !           144: } intr_gate_t;

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.