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 [email protected]
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 <mach/vm_param.h>
62 #include <architecture/i386/sel.h>
63
64 /*
65 * i386 segmentation.
66 */
67
68 static inline uint16_t
sel_to_selector(sel_t sel)69 sel_to_selector(sel_t sel)
70 {
71 union {
72 sel_t sel;
73 uint16_t selector;
74 } tconv;
75
76 tconv.sel = sel;
77
78 return tconv.selector;
79 }
80
81 static inline sel_t
selector_to_sel(uint16_t selector)82 selector_to_sel(uint16_t selector)
83 {
84 union {
85 uint16_t selector;
86 sel_t sel;
87 } tconv;
88
89 tconv.selector = selector;
90
91 return tconv.sel;
92 }
93
94 #define LDTSZ_MAX 8192 /* maximal size of the kernel ldt in entries */
95 #define LDTSZ_DFL (128)
96 #define LDTSZ (LDTSZ_MAX)
97 #define LDTSZ_MIN SEL_TO_INDEX(USER_SETTABLE)
98 /* kernel ldt entries */
99
100 #define GDTSZ 19
101
102 /*
103 * Interrupt table is always 256 entries long.
104 */
105 #define IDTSZ 256
106
107 #include <sys/cdefs.h>
108
109 /*
110 * Real segment descriptor.
111 */
112 struct real_descriptor {
113 uint32_t limit_low:16, /* limit 0..15 */
114 base_low:16, /* base 0..15 */
115 base_med:8, /* base 16..23 */
116 access:8, /* access byte */
117 limit_high:4, /* limit 16..19 */
118 granularity:4, /* granularity */
119 base_high:8; /* base 24..31 */
120 };
121 struct real_descriptor64 {
122 uint32_t limit_low16:16, /* limit 0..15 */
123 base_low16:16, /* base 0..15 */
124 base_med8:8, /* base 16..23 */
125 access8:8, /* access byte */
126 limit_high4:4, /* limit 16..19 */
127 granularity4:4, /* granularity */
128 base_high8:8, /* base 24..31 */
129 base_top32:32, /* base 32..63 */
130 reserved32:32; /* reserved/zero */
131 };
132 struct real_gate {
133 uint32_t offset_low:16, /* offset 0..15 */
134 selector:16,
135 word_count:8,
136 access:8,
137 offset_high:16; /* offset 16..31 */
138 };
139 struct real_gate64 {
140 uint32_t offset_low16:16, /* offset 0..15 */
141 selector16:16,
142 IST:3,
143 zeroes5:5,
144 access8:8,
145 offset_high16:16, /* offset 16..31 */
146 offset_top32:32, /* offset 32..63 */
147 reserved32:32; /* reserved/zero */
148 };
149
150 #define MAKE_REAL_DESCRIPTOR(base, lim, gran, acc) {\
151 .limit_low = lim & 0xffff, \
152 .limit_high = (lim >> 16) & 0xf, \
153 .base_low = base & 0xffff, \
154 .base_med = (base >> 16) & 0xff, \
155 .base_high = (base >> 24) & 0xff, \
156 .access = acc, \
157 .granularity = gran \
158 }
159
160 /*
161 * We build descriptors and gates in a 'fake' format to let the
162 * fields be contiguous. We shuffle them into the real format
163 * at runtime.
164 */
165 struct fake_descriptor {
166 uint32_t offset:32; /* offset */
167 uint32_t lim_or_seg:20; /* limit */
168 /* or segment, for gate */
169 uint32_t size_or_wdct:4; /* size/granularity */
170 /* word count, for gate */
171 uint32_t access:8; /* access */
172 };
173 struct fake_descriptor64 {
174 uint64_t offset64; /* offset [0..31,32..63] */
175 uint32_t lim_or_seg:20; /* limit */
176 /* or segment, for gate */
177 uint32_t size_or_IST:4; /* size/granularity */
178 /* IST for gates */
179 uint32_t access:8; /* access */
180 uint32_t reserved:32; /* reserved/zero */
181 };
182
183 typedef struct __attribute__((packed)) {
184 uint16_t size;
185 void *ptr;
186 } x86_64_desc_register_t;
187
188
189
190 /*
191 * Boot-time data for master (or only) CPU
192 */
193 extern struct real_descriptor master_gdt[GDTSZ];
194 extern struct real_descriptor master_ldt[];
195 extern struct i386_tss master_ktss;
196 extern struct sysenter_stack master_sstk;
197
198 extern struct fake_descriptor64 master_idt64[IDTSZ];
199 extern struct x86_64_tss master_ktss64;
200
201 __BEGIN_DECLS
202
203 extern char df_task_stack[];
204 extern char df_task_stack_end[];
205 extern struct i386_tss master_dftss;
206 extern void df_task_start(void);
207
208 extern char mc_task_stack[];
209 extern char mc_task_stack_end[];
210 extern struct i386_tss master_mctss;
211 extern void mc_task_start(void);
212
213 __END_DECLS
214
215 #endif /*__ASSEMBLER__*/
216
217 #define SZ_64 0x2 /* 64-bit segment */
218 #define SZ_32 0x4 /* 32-bit segment */
219 #define SZ_G 0x8 /* 4K limit field */
220
221 #define ACC_A 0x01 /* accessed */
222 #define ACC_TYPE 0x1e /* type field: */
223
224 #define ACC_TYPE_SYSTEM 0x00 /* system descriptors: */
225
226 #define ACC_LDT 0x02 /* LDT */
227 #define ACC_CALL_GATE_16 0x04 /* 16-bit call gate */
228 #define ACC_TASK_GATE 0x05 /* task gate */
229 #define ACC_TSS 0x09 /* task segment */
230 #define ACC_CALL_GATE 0x0c /* call gate */
231 #define ACC_INTR_GATE 0x0e /* interrupt gate */
232 #define ACC_TRAP_GATE 0x0f /* trap gate */
233
234 #define ACC_TSS_BUSY 0x02 /* task busy */
235
236 #define ACC_TYPE_USER 0x10 /* user descriptors */
237
238 #define ACC_DATA 0x10 /* data */
239 #define ACC_DATA_W 0x12 /* data, writable */
240 #define ACC_DATA_E 0x14 /* data, expand-down */
241 #define ACC_DATA_EW 0x16 /* data, expand-down,
242 * writable */
243 #define ACC_CODE 0x18 /* code */
244 #define ACC_CODE_R 0x1a /* code, readable */
245 #define ACC_CODE_C 0x1c /* code, conforming */
246 #define ACC_CODE_CR 0x1e /* code, conforming,
247 * readable */
248 #define ACC_PL 0x60 /* access rights: */
249 #define ACC_PL_K 0x00 /* kernel access only */
250 #define ACC_PL_U 0x60 /* user access */
251 #define ACC_P 0x80 /* segment present */
252
253 /*
254 * Components of a selector
255 */
256 #define SEL_LDTS 0x04 /* local selector */
257 #define SEL_PL 0x03 /* privilege level: */
258 #define SEL_PL_K 0x00 /* kernel selector */
259 #define SEL_PL_U 0x03 /* user selector */
260
261 /*
262 * Convert selector to descriptor table index.
263 */
264 #define sel_idx(sel) (selector_to_sel(sel).index)
265 #define SEL_TO_INDEX(s) ((s)>>3)
266
267 #define NULL_SEG 0
268
269
270 /*
271 * Kernel descriptors for MACH - 64-bit flat address space.
272 */
273 #define KERNEL64_CS 0x08 /* 1: K64 code */
274 #define SYSENTER_CS 0x0b /* U32 sysenter pseudo-segment */
275 #define KERNEL64_SS 0x10 /* 2: KERNEL64_CS+8 for syscall */
276 #define USER_CS 0x1b /* 3: U32 code */
277 #define USER_DS 0x23 /* 4: USER_CS+8 for sysret */
278 #define USER64_CS 0x2b /* 5: USER_CS+16 for sysret */
279 #define USER64_DS USER_DS /* U64 data pseudo-segment */
280 #define KERNEL_LDT 0x30 /* 6: */
281 /* 7: other 8 bytes of KERNEL_LDT */
282 #define KERNEL_TSS 0x40 /* 8: */
283 /* 9: other 8 bytes of KERNEL_TSS */
284 #define KERNEL32_CS 0x50 /* 10: */
285 #define USER_LDT 0x58 /* 11: */
286 /* 12: other 8 bytes of USER_LDT */
287 #define KERNEL_DS 0x68 /* 13: 32-bit kernel data */
288
289
290 #define SYSENTER_TF_CS (USER_CS|0x10000)
291 #define SYSENTER_DS KERNEL64_SS /* sysenter kernel data segment */
292
293 #endif /* _I386_SEG_H_ */
294 #ifdef __x86_64__
295 /*
296 * 64-bit kernel LDT descriptors
297 */
298 #define SYSCALL_CS 0x07 /* syscall pseudo-segment */
299 #define USER_CTHREAD 0x0f /* user cthread area */
300 #define USER_SETTABLE 0x1f /* start of user settable ldt entries */
301 #endif
302