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  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1992 NeXT Computer, Inc.
  27  *
  28  * Intel386 Family:     Descriptor tables.
  29  *
  30  * HISTORY
  31  *
  32  * 30 March 1992 ? at NeXT
  33  *      Created.
  34  */
  35
  36 #include <architecture/i386/desc.h>
  37 #include <architecture/i386/tss.h>
  38
  39 /*
  40  * A totally generic descriptor
  41  * table entry.
  42  */
  43
  44 typedef union dt_entry {
  45     code_desc_t         code;
  46     data_desc_t         data;
  47     ldt_desc_t          ldt;
  48     tss_desc_t          task_state;
  49     call_gate_t         call_gate;
  50     trap_gate_t         trap_gate;
  51     intr_gate_t         intr_gate;
  52     task_gate_t         task_gate;
  53 } dt_entry_t;
  54
  55 #define DESC_TBL_MAX    8192
  56
  57 /*
  58  * Global descriptor table.
  59  */
  60
  61 typedef union gdt_entry {
  62     code_desc_t         code;
  63     data_desc_t         data;
  64     ldt_desc_t          ldt;
  65     call_gate_t         call_gate;
  66     task_gate_t         task_gate;
  67     tss_desc_t          task_state;
  68 } gdt_entry_t;
  69
  70 typedef gdt_entry_t     gdt_t;
  71
  72 /*
  73  * Interrupt descriptor table.
  74  */
  75
  76 typedef union idt_entry {
  77     trap_gate_t         trap_gate;
  78     intr_gate_t         intr_gate;
  79     task_gate_t         task_gate;
  80 } idt_entry_t;
  81
  82 typedef idt_entry_t     idt_t;
  83
  84 /*
  85  * Local descriptor table.
  86  */
  87
  88 typedef union ldt_entry {
  89     code_desc_t         code;
  90     data_desc_t         data;
  91     call_gate_t         call_gate;
  92     task_gate_t         task_gate;
  93 } ldt_entry_t;
  94
  95 typedef ldt_entry_t     ldt_t;