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Root/tags/2.3/i386/include/architecture/i386/desc.h

Source at commit 2862 created 7 years 24 days ago.
By ifabio, Tag 2.3 release, bump svn to 2.4
1/*␊
2 * Copyright (c) 1999 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:␉Segment descriptors.␊
27 *␊
28 * HISTORY␊
29 *␊
30 * 29 March 1992 ? at NeXT␊
31 *␉Created.␊
32 */␊
33␊
34#ifndef _ARCH_I386_DESC_H_␊
35#define _ARCH_I386_DESC_H_␊
36␊
37/*␊
38 * Code segment descriptor.␊
39 */␊
40␊
41typedef struct code_desc {␊
42 unsigned short␉limit00;␊
43 unsigned short␉base00;␊
44 unsigned char␉base16;␊
45 unsigned char␉type␉:5,␊
46#define DESC_CODE_EXEC␉0x18␊
47#define DESC_CODE_READ␉0x1a␊
48␉␉␉dpl␉:2,␊
49␉␉␉present␉:1;␊
50 unsigned char␉limit16␉:4,␊
51␉␉␉␉:2,␊
52␉␉␉opsz␉:1,␊
53#define DESC_CODE_16B␉0␊
54#define DESC_CODE_32B␉1␊
55␉␉␉granular:1;␊
56#define DESC_GRAN_BYTE␉0␊
57#define DESC_GRAN_PAGE␉1␊
58 unsigned char␉base24;␊
59} code_desc_t;␊
60 ␊
61/*␊
62 * Data segment descriptor.␊
63 */␊
64␊
65typedef struct data_desc {␊
66 unsigned short␉limit00;␊
67 unsigned short␉base00;␊
68 unsigned char␉base16;␊
69 unsigned char␉type␉:5,␊
70#define DESC_DATA_RONLY␉0x10␊
71#define DESC_DATA_WRITE␉0x12␊
72␉␉␉dpl␉:2,␊
73␉␉␉present␉:1;␊
74 unsigned char␉limit16␉:4,␊
75␉␉␉␉:2,␊
76␉␉␉stksz␉:1,␊
77#define DESC_DATA_16B␉0␊
78#define DESC_DATA_32B␉1␊
79␉␉␉granular:1;␊
80 unsigned char␉base24;␊
81} data_desc_t;␊
82␊
83/*␊
84 * LDT segment descriptor.␊
85 */␊
86␊
87typedef struct ldt_desc {␊
88 unsigned short␉limit00;␊
89 unsigned short␉base00;␊
90 unsigned char␉base16;␊
91 unsigned char␉type␉:5,␊
92#define DESC_LDT␉0x02␊
93␉␉␉␉:2,␊
94␉␉␉present␉:1;␊
95 unsigned char␉limit16␉:4,␊
96␉␉␉␉:3,␊
97␉␉␉granular:1;␊
98 unsigned char␉base24;␊
99} ldt_desc_t;␊
100␊
101#include <architecture/i386/sel.h>␊
102␊
103/*␊
104 * Call gate descriptor.␊
105 */␊
106 ␊
107typedef struct call_gate {␊
108 unsigned short␉offset00;␊
109 sel_t␉␉seg;␊
110 unsigned int␉argcnt␉:5,␊
111 ␉␉␉␉:3,␊
112␉␉␉type␉:5,␊
113#define DESC_CALL_GATE␉0x0c␊
114␉␉␉dpl␉:2,␊
115␉␉␉present␉:1,␊
116␉␉␉offset16:16;␊
117} call_gate_t;␊
118␊
119/*␊
120 * Trap gate descriptor.␊
121 */␊
122 ␊
123typedef struct trap_gate {␊
124 unsigned short␉offset00;␊
125 sel_t␉␉seg;␊
126 unsigned int␉␉:8,␊
127 ␉␉␉type␉:5,␊
128#define DESC_TRAP_GATE␉0x0f␊
129␉␉␉dpl␉:2,␊
130␉␉␉present␉:1,␊
131␉␉␉offset16:16;␊
132} trap_gate_t;␊
133␊
134␊
135/*␊
136 * Interrupt gate descriptor.␊
137 */␊
138 ␊
139typedef struct intr_gate {␊
140 unsigned short␉offset00;␊
141 sel_t␉␉seg;␊
142 unsigned int␉␉:8,␊
143 ␉␉␉type␉:5,␊
144#define DESC_INTR_GATE␉0x0e␊
145␉␉␉dpl␉:2,␊
146␉␉␉present␉:1,␊
147␉␉␉offset16:16;␊
148} intr_gate_t;␊
149␊
150#endif␉/* _ARCH_I386_DESC_H_ */␊
151

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