1/*
2 * Copyright (c) 2000-2009 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
57/*
58 */
59
60#ifndef _I386_MP_DESC_H_
61#define _I386_MP_DESC_H_
62
63#include <sys/cdefs.h>
64
65__BEGIN_DECLS
66
67/*
68 * Multiprocessor i386/i486 systems use a separate copy of the
69 * GDT, IDT, LDT, and kernel TSS per processor. The first three
70 * are separate to avoid lock contention: the i386 uses locked
71 * memory cycles to access the descriptor tables. The TSS is
72 * separate since each processor needs its own kernel stack,
73 * and since using a TSS marks it busy.
74 */
75
76#include <i386/seg.h>
77#include <i386/tss.h>
78
79/*
80 * The descriptor tables are together in a structure
81 * allocated one per processor (except for the boot processor).
82 */
83#define FSTK_SZ (PAGE_SIZE/2)
84typedef struct cpu_desc_table64 {
85 struct fake_descriptor gdt[GDTSZ] __attribute__ ((aligned (16)));
86 struct x86_64_tss ktss __attribute__ ((aligned (16)));
87 struct sysenter_stack sstk __attribute__ ((aligned (16)));
88 uint8_t *fstkp;
89} cpu_desc_table64_t;
90
91typedef struct {
92 uint8_t fstk[FSTK_SZ] __attribute__ ((aligned (16)));
93} cpu_fault_stack_t;
94
95#define current_gdt() (current_cpu_datap()->cpu_desc_index.cdi_gdtb.ptr)
96#define current_idt() (current_cpu_datap()->cpu_desc_index.cdi_idtb.ptr)
97#define current_ldt() (current_cpu_datap()->cpu_desc_index.cdi_ldtb)
98#define current_ktss() (current_cpu_datap()->cpu_desc_index.cdi_ktssb)
99#define current_sstk() (current_cpu_datap()->cpu_desc_index.cdi_sstkb)
100
101#define current_ktss64() ((struct x86_64_tss *) current_ktss())
102#define current_sstk64() ((addr64_t *) current_sstk())
103
104#define gdt_desc_p(sel) \
105 (&((struct real_descriptor *)current_gdt())[sel_idx(sel)])
106#define ldt_desc_p(sel) \
107 (&((struct real_descriptor *)current_ldt())[sel_idx(sel)])
108
109extern void cpu_syscall_init(cpu_data_t *cdp);
110
111extern void cpu_desc_init(cpu_data_t *cdp);
112extern void cpu_desc_load(cpu_data_t *cdp);
113
114extern boolean_t
115valid_user_data_selector(uint16_t selector);
116
117extern boolean_t
118valid_user_code_selector(uint16_t selector);
119
120extern boolean_t
121valid_user_stack_selector(uint16_t selector);
122
123extern boolean_t
124valid_user_segment_selectors(uint16_t cs,
125 uint16_t ss,
126 uint16_t ds,
127 uint16_t es,
128 uint16_t fs,
129 uint16_t gs);
130
131__END_DECLS
132
133#endif /* _X86_64_MP_DESC_H_ */
134