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; 99