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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 */
86typedef 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
94typedef 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 *)&current_gdt()[sel_idx(sel)])
114#define ldt_desc_p(sel) \
115 ((struct real_descriptor *)&current_ldt()[sel_idx(sel)])
116
117extern void cpu_desc_init(
118 cpu_data_t *cdp,
119 boolean_t is_boot_cpu);
120extern void cpu_desc_init64(
121 cpu_data_t *cdp,
122 boolean_t is_boot_cpu);
123extern void cpu_desc_load64(
124 cpu_data_t *cdp);
125extern void cpu_mode_init(
126 cpu_data_t *cdp);
127
128static inline boolean_t
129valid_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
146static inline boolean_t
147valid_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
166static inline boolean_t
167valid_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
186extern boolean_t
187valid_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_ */