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  * 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:     Descriptor tables.
  26  *
  27  * HISTORY
  28  *
  29  * 30 March 1992 ? at NeXT
  30  *      Created.
  31  */
  32
  33 #include <architecture/i386/desc.h>
  34 #include <architecture/i386/tss.h>
  35
  36 /*
  37  * A totally generic descriptor
  38  * table entry.
  39  */
  40
  41 typedef union dt_entry {
  42     code_desc_t         code;
  43     data_desc_t         data;
  44     ldt_desc_t          ldt;
  45     tss_desc_t          task_state;
  46     call_gate_t         call_gate;
  47     trap_gate_t         trap_gate;
  48     intr_gate_t         intr_gate;
  49     task_gate_t         task_gate;
  50 } dt_entry_t;
  51
  52 #define DESC_TBL_MAX    8192
  53
  54 /*
  55  * Global descriptor table.
  56  */
  57
  58 typedef union gdt_entry {
  59     code_desc_t         code;
  60     data_desc_t         data;
  61     ldt_desc_t          ldt;
  62     call_gate_t         call_gate;
  63     task_gate_t         task_gate;
  64     tss_desc_t          task_state;
  65 } gdt_entry_t;
  66
  67 typedef gdt_entry_t     gdt_t;
  68
  69 /*
  70  * Interrupt descriptor table.
  71  */
  72
  73 typedef union idt_entry {
  74     trap_gate_t         trap_gate;
  75     intr_gate_t         intr_gate;
  76     task_gate_t         task_gate;
  77 } idt_entry_t;
  78
  79 typedef idt_entry_t     idt_t;
  80
  81 /*
  82  * Local descriptor table.
  83  */
  84
  85 typedef union ldt_entry {
  86     code_desc_t         code;
  87     data_desc_t         data;
  88     call_gate_t         call_gate;
  89     task_gate_t         task_gate;
  90 } ldt_entry_t;
  91
  92 typedef ldt_entry_t     ldt_t;