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 */
83typedef struct cpu_desc_table64 {
84	struct fake_descriptor	gdt[GDTSZ]       __attribute__ ((aligned (16)));
85	struct x86_64_tss	ktss             __attribute__ ((aligned (16)));
86	struct sysenter_stack	sstk	         __attribute__ ((aligned (16)));
87	uint8_t			fstk[PAGE_SIZE]  __attribute__ ((aligned (16)));
88} cpu_desc_table64_t;
89
90#define	current_gdt()	(current_cpu_datap()->cpu_desc_index.cdi_gdt.ptr)
91#define	current_idt()	(current_cpu_datap()->cpu_desc_index.cdi_idt.ptr)
92#define	current_ldt()	(current_cpu_datap()->cpu_desc_index.cdi_ldt)
93#define	current_ktss()	(current_cpu_datap()->cpu_desc_index.cdi_ktss)
94#define	current_sstk()	(current_cpu_datap()->cpu_desc_index.cdi_sstk)
95
96#define	current_ktss64() ((struct x86_64_tss *) current_ktss())
97#define	current_sstk64() ((addr64_t *) current_sstk())
98
99#define	gdt_desc_p(sel) \
100	(&((struct real_descriptor *)current_gdt())[sel_idx(sel)])
101#define	ldt_desc_p(sel) \
102	(&((struct real_descriptor *)current_ldt())[sel_idx(sel)])
103
104extern void	cpu_mode_init(cpu_data_t *cdp);
105
106extern void	cpu_desc_init(cpu_data_t *cdp);
107extern void	cpu_desc_init64(cpu_data_t *cdp);
108extern void	cpu_desc_load(cpu_data_t *cdp);
109extern void	cpu_desc_load64(cpu_data_t *cdp);
110
111extern boolean_t
112valid_user_data_selector(uint16_t selector);
113
114extern boolean_t
115valid_user_code_selector(uint16_t selector);
116
117extern boolean_t
118valid_user_stack_selector(uint16_t selector);
119
120extern boolean_t
121valid_user_segment_selectors(uint16_t cs,
122                             uint16_t ss,
123                             uint16_t ds,
124                             uint16_t es,
125                             uint16_t fs,
126                             uint16_t gs);
127
128__END_DECLS
129
130#endif	/* _X86_64_MP_DESC_H_ */
131