EXTERNAL_HEADERS/architecture/i386/table.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_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. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * Copyright (c) 1992 NeXT Computer, Inc.
  30  *
  31  * Intel386 Family:     Descriptor tables.
  32  *
  33  * HISTORY
  34  *
  35  * 30 March 1992 ? at NeXT
  36  *      Created.
  37  */
  38
  39 #include <architecture/i386/desc.h>
  40 #include <architecture/i386/tss.h>
  41
  42 /*
  43  * A totally generic descriptor
  44  * table entry.
  45  */
  46
  47 typedef union dt_entry {
  48     code_desc_t         code;
  49     data_desc_t         data;
  50     ldt_desc_t          ldt;
  51     tss_desc_t          task_state;
  52     call_gate_t         call_gate;
  53     trap_gate_t         trap_gate;
  54     intr_gate_t         intr_gate;
  55     task_gate_t         task_gate;
  56 } dt_entry_t;
  57
  58 #define DESC_TBL_MAX    8192
  59
  60 /*
  61  * Global descriptor table.
  62  */
  63
  64 typedef union gdt_entry {
  65     code_desc_t         code;
  66     data_desc_t         data;
  67     ldt_desc_t          ldt;
  68     call_gate_t         call_gate;
  69     task_gate_t         task_gate;
  70     tss_desc_t          task_state;
  71 } gdt_entry_t;
  72
  73 typedef gdt_entry_t     gdt_t;
  74
  75 /*
  76  * Interrupt descriptor table.
  77  */
  78
  79 typedef union idt_entry {
  80     trap_gate_t         trap_gate;
  81     intr_gate_t         intr_gate;
  82     task_gate_t         task_gate;
  83 } idt_entry_t;
  84
  85 typedef idt_entry_t     idt_t;
  86
  87 /*
  88  * Local descriptor table.
  89  */
  90
  91 typedef union ldt_entry {
  92     code_desc_t         code;
  93     data_desc_t         data;
  94     call_gate_t         call_gate;
  95     task_gate_t         task_gate;
  96 } ldt_entry_t;
  97
  98 typedef ldt_entry_t     ldt_t;