![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to seg.h CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Apple XNU] / XNU / osfmk / i386|
Return to seg.h CVS log | Up to [Apple XNU] / XNU / osfmk / i386 |
1.1 root 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: * @OSF_COPYRIGHT@
24: */
25: /*
26: * Mach Operating System
27: * Copyright (c) 1991,1990 Carnegie Mellon University
28: * All Rights Reserved.
29: *
30: * Permission to use, copy, modify and distribute this software and its
31: * documentation is hereby granted, provided that both the copyright
32: * notice and this permission notice appear in all copies of the
33: * software, derivative works or modified versions, and any portions
34: * thereof, and that both notices appear in supporting documentation.
35: *
36: * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
37: * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
38: * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
39: *
40: * Carnegie Mellon requests users of this software to return to
41: *
42: * Software Distribution Coordinator or [email protected]
43: * School of Computer Science
44: * Carnegie Mellon University
45: * Pittsburgh PA 15213-3890
46: *
47: * any improvements or extensions that they make and grant Carnegie Mellon
48: * the rights to redistribute these changes.
49: */
50: /*
51: */
52:
53: #ifndef _I386_SEG_H_
54: #define _I386_SEG_H_
55: #include <mach_kdb.h>
56:
57: /*
58: * i386 segmentation.
59: */
60:
61: #ifndef __ASSEMBLER__
62: /*
63: * Real segment descriptor.
64: */
65: struct real_descriptor {
66: unsigned int limit_low:16, /* limit 0..15 */
67: base_low:16, /* base 0..15 */
68: base_med:8, /* base 16..23 */
69: access:8, /* access byte */
70: limit_high:4, /* limit 16..19 */
71: granularity:4, /* granularity */
72: base_high:8; /* base 24..31 */
73: };
74:
75: struct real_gate {
76: unsigned int offset_low:16, /* offset 0..15 */
77: selector:16,
78: word_count:8,
79: access:8,
80: offset_high:16; /* offset 16..31 */
81: };
82:
83: /*
84: * We build descriptors and gates in a 'fake' format to let the
85: * fields be contiguous. We shuffle them into the real format
86: * at runtime.
87: */
88: struct fake_descriptor {
89: unsigned int offset:32; /* offset */
90: unsigned int lim_or_seg:20; /* limit */
91: /* or segment, for gate */
92: unsigned int size_or_wdct:4; /* size/granularity */
93: /* word count, for gate */
94: unsigned int access:8; /* access */
95: };
96: #endif /*__ASSEMBLER__*/
97:
98: #define SZ_32 0x4 /* 32-bit segment */
99: #define SZ_G 0x8 /* 4K limit field */
100:
101: #define ACC_A 0x01 /* accessed */
102: #define ACC_TYPE 0x1e /* type field: */
103:
104: #define ACC_TYPE_SYSTEM 0x00 /* system descriptors: */
105:
106: #define ACC_LDT 0x02 /* LDT */
107: #define ACC_CALL_GATE_16 0x04 /* 16-bit call gate */
108: #define ACC_TASK_GATE 0x05 /* task gate */
109: #define ACC_TSS 0x09 /* task segment */
110: #define ACC_CALL_GATE 0x0c /* call gate */
111: #define ACC_INTR_GATE 0x0e /* interrupt gate */
112: #define ACC_TRAP_GATE 0x0f /* trap gate */
113:
114: #define ACC_TSS_BUSY 0x02 /* task busy */
115:
116: #define ACC_TYPE_USER 0x10 /* user descriptors */
117:
118: #define ACC_DATA 0x10 /* data */
119: #define ACC_DATA_W 0x12 /* data, writable */
120: #define ACC_DATA_E 0x14 /* data, expand-down */
121: #define ACC_DATA_EW 0x16 /* data, expand-down,
122: writable */
123: #define ACC_CODE 0x18 /* code */
124: #define ACC_CODE_R 0x1a /* code, readable */
125: #define ACC_CODE_C 0x1c /* code, conforming */
126: #define ACC_CODE_CR 0x1e /* code, conforming,
127: readable */
128: #define ACC_PL 0x60 /* access rights: */
129: #define ACC_PL_K 0x00 /* kernel access only */
130: #define ACC_PL_U 0x60 /* user access */
131: #define ACC_P 0x80 /* segment present */
132:
133: /*
134: * Components of a selector
135: */
136: #define SEL_LDTS 0x04 /* local selector */
137: #define SEL_PL 0x03 /* privilege level: */
138: #define SEL_PL_K 0x00 /* kernel selector */
139: #define SEL_PL_U 0x03 /* user selector */
140:
141: /*
142: * Convert selector to descriptor table index.
143: */
144: #define sel_idx(sel) ((sel)>>3)
145:
146: /*
147: * User descriptors for MACH - 32-bit flat address space
148: */
149: #define USER_SCALL 0x07 /* system call gate */
150: #define USER_RPC 0x0f /* mach rpc call gate */
151: #define USER_CS 0x17 /* user code segment */
152: #define USER_DS 0x1f /* user data segment */
153:
154: #define LDTSZ 4
155:
156: /*
157: * Kernel descriptors for MACH - 32-bit flat address space.
158: */
159: #define KERNEL_CS 0x08 /* kernel code */
160: #define KERNEL_DS 0x10 /* kernel data */
161: #define KERNEL_LDT 0x18 /* master LDT */
162: #define KERNEL_TSS 0x20 /* master TSS (uniprocessor) */
163: #ifdef MACH_BSD
164: #define BSD_SCALL_SEL 0x28 /* BSD System calls */
165: #define MK25_SCALL_SEL 0x30 /* MK25 System Calls */
166: #define MACHDEP_SCALL_SEL 0x38 /* Machdep SYstem calls */
167: #else
168: #define USER_LDT 0x28 /* place for per-thread LDT */
169: #define USER_TSS 0x30 /* place for per-thread TSS
170: that holds IO bitmap */
171: #define FPE_CS 0x38 /* floating-point emulator code */
172: #endif
173: #define USER_FPREGS 0x40 /* user-mode access to saved
174: floating-point registers */
175: #define CPU_DATA 0x48 /* per-cpu data */
176:
177: #ifdef MACH_BSD
178: #define USER_LDT 0x58
179: #define USER_TSS 0x60
180: #define FPE_CS 0x68
181: #endif
182:
183: #if MACH_KDB
184: #define DEBUG_TSS 0x50 /* debug TSS (uniprocessor) */
185:
186: #ifdef MACH_BSD
187: #define GDTSZ 14
188: #else
189: #define GDTSZ 11
190: #endif
191: #else
192:
193: #ifdef MACH_BSD
194: #define GDTSZ 13
195: #else
196: #define GDTSZ 10
197: #endif
198: #endif
199:
200: /*
201: * Interrupt table is always 256 entries long.
202: */
203: #define IDTSZ 256
204:
205: #endif /* _I386_SEG_H_ */
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.