EXTERNAL_HEADERS/architecture/i386/table.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * Copyright (c) 1992 NeXT Computer, Inc.
  25  *
  26  * Intel386 Family:     Descriptor tables.
  27  *
  28  * HISTORY
  29  *
  30  * 30 March 1992 ? at NeXT
  31  *      Created.
  32  */
  33
  34 #include <architecture/i386/desc.h>
  35 #include <architecture/i386/tss.h>
  36
  37 /*
  38  * A totally generic descriptor
  39  * table entry.
  40  */
  41
  42 typedef union dt_entry {
  43     code_desc_t         code;
  44     data_desc_t         data;
  45     ldt_desc_t          ldt;
  46     tss_desc_t          task_state;
  47     call_gate_t         call_gate;
  48     trap_gate_t         trap_gate;
  49     intr_gate_t         intr_gate;
  50     task_gate_t         task_gate;
  51 } dt_entry_t;
  52
  53 #define DESC_TBL_MAX    8192
  54
  55 /*
  56  * Global descriptor table.
  57  */
  58
  59 typedef union gdt_entry {
  60     code_desc_t         code;
  61     data_desc_t         data;
  62     ldt_desc_t          ldt;
  63     call_gate_t         call_gate;
  64     task_gate_t         task_gate;
  65     tss_desc_t          task_state;
  66 } gdt_entry_t;
  67
  68 typedef gdt_entry_t     gdt_t;
  69
  70 /*
  71  * Interrupt descriptor table.
  72  */
  73
  74 typedef union idt_entry {
  75     trap_gate_t         trap_gate;
  76     intr_gate_t         intr_gate;
  77     task_gate_t         task_gate;
  78 } idt_entry_t;
  79
  80 typedef idt_entry_t     idt_t;
  81
  82 /*
  83  * Local descriptor table.
  84  */
  85
  86 typedef union ldt_entry {
  87     code_desc_t         code;
  88     data_desc_t         data;
  89     call_gate_t         call_gate;
  90     task_gate_t         task_gate;
  91 } ldt_entry_t;
  92
  93 typedef ldt_entry_t     ldt_t;