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1 | /* | |
2 | * Copyright (c) 2000-2006 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 | * @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 | ||
57 | /* | |
58 | */ | |
59 | ||
60 | #ifndef _I386_MP_DESC_H_ | |
61 | #define _I386_MP_DESC_H_ | |
62 | ||
63 | #include <mach_kdb.h> | |
64 | #include <sys/cdefs.h> | |
65 | ||
66 | __BEGIN_DECLS | |
67 | ||
68 | /* | |
69 | * Multiprocessor i386/i486 systems use a separate copy of the | |
70 | * GDT, IDT, LDT, and kernel TSS per processor. The first three | |
71 | * are separate to avoid lock contention: the i386 uses locked | |
72 | * memory cycles to access the descriptor tables. The TSS is | |
73 | * separate since each processor needs its own kernel stack, | |
74 | * and since using a TSS marks it busy. | |
75 | */ | |
76 | ||
77 | #include <i386/seg.h> | |
78 | #include <i386/tss.h> | |
79 | ||
80 | /* | |
81 | * The descriptor tables are together in a structure | |
82 | * allocated one per processor (except for the boot processor). | |
83 | * Note that dbtss could be conditionalized on MACH_KDB, but | |
84 | * doing so increases misconfiguration risk. | |
85 | */ | |
86 | typedef struct cpu_desc_table { | |
87 | struct fake_descriptor idt[IDTSZ] __attribute__ ((aligned (16))); | |
88 | struct fake_descriptor gdt[GDTSZ] __attribute__ ((aligned (16))); | |
89 | struct i386_tss ktss __attribute__ ((aligned (16))); | |
90 | struct i386_tss dbtss __attribute__ ((aligned (16))); | |
91 | struct sysenter_stack sstk; | |
92 | } cpu_desc_table_t; | |
93 | ||
94 | typedef struct cpu_desc_table64 { | |
95 | struct fake_descriptor64 idt[IDTSZ] __attribute__ ((aligned (16))); | |
96 | struct fake_descriptor gdt[GDTSZ] __attribute__ ((aligned (16))); | |
97 | struct x86_64_tss ktss __attribute__ ((aligned (16))); | |
98 | struct sysenter_stack sstk __attribute__ ((aligned (16))); | |
99 | uint8_t dfstk[PAGE_SIZE] __attribute__ ((aligned (16))); | |
100 | } cpu_desc_table64_t; | |
101 | ||
102 | #define current_gdt() (current_cpu_datap()->cpu_desc_index.cdi_gdt) | |
103 | #define current_idt() (current_cpu_datap()->cpu_desc_index.cdi_idt) | |
104 | #define current_ldt() (current_cpu_datap()->cpu_desc_index.cdi_ldt) | |
105 | #define current_ktss() (current_cpu_datap()->cpu_desc_index.cdi_ktss) | |
106 | #define current_dbtss() (current_cpu_datap()->cpu_desc_index.cdi_dbtss) | |
107 | #define current_sstk() (current_cpu_datap()->cpu_desc_index.cdi_sstk) | |
108 | ||
109 | #define current_ktss64() ((struct x86_64_tss *) current_ktss()) | |
110 | #define current_sstk64() ((addr64_t *) current_sstk()) | |
111 | ||
112 | #define gdt_desc_p(sel) \ | |
113 | ((struct real_descriptor *)¤t_gdt()[sel_idx(sel)]) | |
114 | #define ldt_desc_p(sel) \ | |
115 | ((struct real_descriptor *)¤t_ldt()[sel_idx(sel)]) | |
116 | ||
117 | extern void cpu_desc_init( | |
118 | cpu_data_t *cdp, | |
119 | boolean_t is_boot_cpu); | |
120 | extern void cpu_desc_init64( | |
121 | cpu_data_t *cdp, | |
122 | boolean_t is_boot_cpu); | |
123 | extern void cpu_desc_load64( | |
124 | cpu_data_t *cdp); | |
125 | extern void cpu_mode_init( | |
126 | cpu_data_t *cdp); | |
127 | ||
128 | static inline boolean_t | |
129 | valid_user_data_selector(uint16_t selector) | |
130 | { | |
131 | sel_t sel = selector_to_sel(selector); | |
132 | ||
133 | if (selector == 0) | |
134 | return (TRUE); | |
135 | ||
136 | if (sel.ti == SEL_LDT) | |
137 | return (TRUE); | |
138 | else if (sel.index < GDTSZ) { | |
139 | if ((gdt_desc_p(selector)->access & ACC_PL_U) == ACC_PL_U) | |
140 | return (TRUE); | |
141 | } | |
142 | ||
143 | return (FALSE); | |
144 | } | |
145 | ||
146 | static inline boolean_t | |
147 | valid_user_code_selector(uint16_t selector) | |
148 | { | |
149 | sel_t sel = selector_to_sel(selector); | |
150 | ||
151 | if (selector == 0) | |
152 | return (FALSE); | |
153 | ||
154 | if (sel.ti == SEL_LDT) { | |
155 | if (sel.rpl == USER_PRIV) | |
156 | return (TRUE); | |
157 | } | |
158 | else if (sel.index < GDTSZ && sel.rpl == USER_PRIV) { | |
159 | if ((gdt_desc_p(selector)->access & ACC_PL_U) == ACC_PL_U) | |
160 | return (TRUE); | |
161 | } | |
162 | ||
163 | return (FALSE); | |
164 | } | |
165 | ||
166 | static inline boolean_t | |
167 | valid_user_stack_selector(uint16_t selector) | |
168 | { | |
169 | sel_t sel = selector_to_sel(selector); | |
170 | ||
171 | if (selector == 0) | |
172 | return (FALSE); | |
173 | ||
174 | if (sel.ti == SEL_LDT) { | |
175 | if (sel.rpl == USER_PRIV) | |
176 | return (TRUE); | |
177 | } | |
178 | else if (sel.index < GDTSZ && sel.rpl == USER_PRIV) { | |
179 | if ((gdt_desc_p(selector)->access & ACC_PL_U) == ACC_PL_U) | |
180 | return (TRUE); | |
181 | } | |
182 | ||
183 | return (FALSE); | |
184 | } | |
185 | ||
186 | extern boolean_t | |
187 | valid_user_segment_selectors(uint16_t cs, | |
188 | uint16_t ss, | |
189 | uint16_t ds, | |
190 | uint16_t es, | |
191 | uint16_t fs, | |
192 | uint16_t gs); | |
193 | ||
194 | __END_DECLS | |
195 | ||
196 | #endif /* _I386_MP_DESC_H_ */ |