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1/*
2 * Copyright (c) 2000-2012 Apple 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 * @OSF_COPYRIGHT@
30 */
31/*
32 * Mach Operating System
33 * Copyright (c) 1991,1990 Carnegie Mellon University
34 * All Rights Reserved.
35 *
36 * Permission to use, copy, modify and distribute this software and its
37 * documentation is hereby granted, provided that both the copyright
38 * notice and this permission notice appear in all copies of the
39 * software, derivative works or modified versions, and any portions
40 * thereof, and that both notices appear in supporting documentation.
41 *
42 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
43 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
44 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
45 *
46 * Carnegie Mellon requests users of this software to return to
47 *
48 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
49 * School of Computer Science
50 * Carnegie Mellon University
51 * Pittsburgh PA 15213-3890
52 *
53 * any improvements or extensions that they make and grant Carnegie Mellon
54 * the rights to redistribute these changes.
55 */
56#ifndef _I386_SEG_H_
57#define _I386_SEG_H_
58#ifndef __ASSEMBLER__
59#include <stdint.h>
60#include <mach/vm_types.h>
61#include <architecture/i386/sel.h>
62
63/*
64 * i386 segmentation.
65 */
66
67static inline uint16_t
68sel_to_selector(sel_t sel)
69{
70 union {
71 sel_t sel;
72 uint16_t selector;
73 } tconv;
74
75 tconv.sel = sel;
76
77 return (tconv.selector);
78}
79
80static inline sel_t
81selector_to_sel(uint16_t selector)
82{
83 union {
84 uint16_t selector;
85 sel_t sel;
86 } tconv;
87
88 tconv.selector = selector;
89
90 return (tconv.sel);
91}
92
93#define LDTSZ 8192 /* size of the kernel ldt in entries */
94#define LDTSZ_MIN SEL_TO_INDEX(USER_SETTABLE)
95 /* kernel ldt entries */
96
97#define GDTSZ 19
98
99/*
100 * Interrupt table is always 256 entries long.
101 */
102#define IDTSZ 256
103
104#include <sys/cdefs.h>
105
106/*
107 * Real segment descriptor.
108 */
109struct real_descriptor {
110 uint32_t limit_low:16, /* limit 0..15 */
111 base_low:16, /* base 0..15 */
112 base_med:8, /* base 16..23 */
113 access:8, /* access byte */
114 limit_high:4, /* limit 16..19 */
115 granularity:4, /* granularity */
116 base_high:8; /* base 24..31 */
117};
118struct real_descriptor64 {
119 uint32_t limit_low16:16, /* limit 0..15 */
120 base_low16:16, /* base 0..15 */
121 base_med8:8, /* base 16..23 */
122 access8:8, /* access byte */
123 limit_high4:4, /* limit 16..19 */
124 granularity4:4, /* granularity */
125 base_high8:8, /* base 24..31 */
126 base_top32:32, /* base 32..63 */
127 reserved32:32; /* reserved/zero */
128};
129struct real_gate {
130 uint32_t offset_low:16, /* offset 0..15 */
131 selector:16,
132 word_count:8,
133 access:8,
134 offset_high:16; /* offset 16..31 */
135};
136struct real_gate64 {
137 uint32_t offset_low16:16, /* offset 0..15 */
138 selector16:16,
139 IST:3,
140 zeroes5:5,
141 access8:8,
142 offset_high16:16, /* offset 16..31 */
143 offset_top32:32, /* offset 32..63 */
144 reserved32:32; /* reserved/zero */
145};
146
147#define MAKE_REAL_DESCRIPTOR(base,lim,gran,acc) { \
148 .limit_low = lim & 0xffff, \
149 .limit_high = (lim >> 16) & 0xf, \
150 .base_low = base & 0xffff, \
151 .base_med = (base >> 16) & 0xff, \
152 .base_high = (base >> 24) & 0xff, \
153 .access = acc, \
154 .granularity = gran \
155}
156
157/*
158 * We build descriptors and gates in a 'fake' format to let the
159 * fields be contiguous. We shuffle them into the real format
160 * at runtime.
161 */
162struct fake_descriptor {
163 uint32_t offset:32; /* offset */
164 uint32_t lim_or_seg:20; /* limit */
165 /* or segment, for gate */
166 uint32_t size_or_wdct:4; /* size/granularity */
167 /* word count, for gate */
168 uint32_t access:8; /* access */
169};
170struct fake_descriptor64 {
171 uint64_t offset64; /* offset [0..31,32..63] */
172 uint32_t lim_or_seg:20; /* limit */
173 /* or segment, for gate */
174 uint32_t size_or_IST:4; /* size/granularity */
175 /* IST for gates */
176 uint32_t access:8; /* access */
177 uint32_t reserved:32; /* reserved/zero */
178};
179
180/*
181 * Boot-time data for master (or only) CPU
182 */
183extern struct fake_descriptor master_idt[IDTSZ];
184extern struct real_descriptor master_gdt[GDTSZ];
185extern struct real_descriptor master_ldt[LDTSZ];
186extern struct i386_tss master_ktss;
187extern struct sysenter_stack master_sstk;
188
189extern struct fake_descriptor64 master_idt64[IDTSZ];
190extern struct x86_64_tss master_ktss64;
191
192__BEGIN_DECLS
193
194extern char df_task_stack[];
195extern char df_task_stack_end[];
196extern struct i386_tss master_dftss;
197extern void df_task_start(void);
198
199extern char mc_task_stack[];
200extern char mc_task_stack_end[];
201extern struct i386_tss master_mctss;
202extern void mc_task_start(void);
203
204__END_DECLS
205
206#endif /*__ASSEMBLER__*/
207
208#define SZ_64 0x2 /* 64-bit segment */
209#define SZ_32 0x4 /* 32-bit segment */
210#define SZ_G 0x8 /* 4K limit field */
211
212#define ACC_A 0x01 /* accessed */
213#define ACC_TYPE 0x1e /* type field: */
214
215#define ACC_TYPE_SYSTEM 0x00 /* system descriptors: */
216
217#define ACC_LDT 0x02 /* LDT */
218#define ACC_CALL_GATE_16 0x04 /* 16-bit call gate */
219#define ACC_TASK_GATE 0x05 /* task gate */
220#define ACC_TSS 0x09 /* task segment */
221#define ACC_CALL_GATE 0x0c /* call gate */
222#define ACC_INTR_GATE 0x0e /* interrupt gate */
223#define ACC_TRAP_GATE 0x0f /* trap gate */
224
225#define ACC_TSS_BUSY 0x02 /* task busy */
226
227#define ACC_TYPE_USER 0x10 /* user descriptors */
228
229#define ACC_DATA 0x10 /* data */
230#define ACC_DATA_W 0x12 /* data, writable */
231#define ACC_DATA_E 0x14 /* data, expand-down */
232#define ACC_DATA_EW 0x16 /* data, expand-down,
233 writable */
234#define ACC_CODE 0x18 /* code */
235#define ACC_CODE_R 0x1a /* code, readable */
236#define ACC_CODE_C 0x1c /* code, conforming */
237#define ACC_CODE_CR 0x1e /* code, conforming,
238 readable */
239#define ACC_PL 0x60 /* access rights: */
240#define ACC_PL_K 0x00 /* kernel access only */
241#define ACC_PL_U 0x60 /* user access */
242#define ACC_P 0x80 /* segment present */
243
244/*
245 * Components of a selector
246 */
247#define SEL_LDTS 0x04 /* local selector */
248#define SEL_PL 0x03 /* privilege level: */
249#define SEL_PL_K 0x00 /* kernel selector */
250#define SEL_PL_U 0x03 /* user selector */
251
252/*
253 * Convert selector to descriptor table index.
254 */
255#define sel_idx(sel) (selector_to_sel(sel).index)
256#define SEL_TO_INDEX(s) ((s)>>3)
257
258#define NULL_SEG 0
259
260
261/*
262 * Kernel descriptors for MACH - 64-bit flat address space.
263 */
264#define KERNEL64_CS 0x08 /* 1: K64 code */
265#define SYSENTER_CS 0x0b /* U32 sysenter pseudo-segment */
266#define KERNEL64_SS 0x10 /* 2: KERNEL64_CS+8 for syscall */
267#define USER_CS 0x1b /* 3: U32 code */
268#define USER_DS 0x23 /* 4: USER_CS+8 for sysret */
269#define USER64_CS 0x2b /* 5: USER_CS+16 for sysret */
270#define USER64_DS USER_DS /* U64 data pseudo-segment */
271#define KERNEL_LDT 0x30 /* 6: */
272 /* 7: other 8 bytes of KERNEL_LDT */
273#define KERNEL_TSS 0x40 /* 8: */
274 /* 9: other 8 bytes of KERNEL_TSS */
275#define KERNEL32_CS 0x50 /* 10: */
276#define USER_LDT 0x58 /* 11: */
277 /* 12: other 8 bytes of USER_LDT */
278#define KERNEL_DS 0x68 /* 13: 32-bit kernel data */
279
280
281#define SYSENTER_TF_CS (USER_CS|0x10000)
282#define SYSENTER_DS KERNEL64_SS /* sysenter kernel data segment */
283
284#ifdef __x86_64__
285/*
286 * 64-bit kernel LDT descriptors
287 */
288#define SYSCALL_CS 0x07 /* syscall pseudo-segment */
289#define USER_CTHREAD 0x0f /* user cthread area */
290#define USER_SETTABLE 0x1f /* start of user settable ldt entries */
291#endif
292
293#endif /* _I386_SEG_H_ */