summaryrefslogtreecommitdiffstats
path: root/sys/i386/include/globals.h
blob: b399b7c27ad1bfd81d7de75f522c00c1eeedefcc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
/*-
 * Copyright (c) 1999 Luoqi Chen <luoqi@freebsd.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * $FreeBSD$
 */

#ifndef	_MACHINE_GLOBALS_H_
#define	_MACHINE_GLOBALS_H_

#ifdef KERNEL

#define	GLOBAL_LVALUE(name, type) \
	(*(type *)_global_ptr_##name())
	
#define	GLOBAL_RVALUE(name, type) \
	((type)_global_##name())

/* non-volatile version */
#define	GLOBAL_LVALUE_NV(name, type) \
	(*(type *)_global_ptr_##name##_nv())
	
#define	GLOBAL_RVALUE_NV(name, type) \
	((type)_global_##name##_nv())

#define	GLOBAL_FUNC(name) \
	static __inline void *_global_ptr_##name(void) { \
		void *val; \
		__asm __volatile("movl $gd_" #name ",%0;" \
			"addl %%fs:globaldata,%0" : "=r" (val)); \
		return (val); \
	} \
	static __inline void *_global_ptr_##name##_nv(void) { \
		void *val; \
		__asm("movl $gd_" #name ",%0;" \
			"addl %%fs:globaldata,%0" : "=r" (val)); \
		return (val); \
	} \
	static __inline int _global_##name(void) { \
		int val; \
		__asm __volatile("movl %%fs:gd_" #name ",%0" : "=r" (val)); \
		return (val); \
	} \
	static __inline int _global_##name##_nv(void) { \
		int val; \
		__asm("movl %%fs:gd_" #name ",%0" : "=r" (val)); \
		return (val); \
	} \
	static __inline void _global_##name##_set(int val) { \
		__asm __volatile("movl %0,%%fs:gd_" #name : : "r" (val)); \
	} \
	static __inline void _global_##name##_set_nv(int val) { \
		__asm("movl %0,%%fs:gd_" #name : : "r" (val)); \
	}

#if defined(SMP) || defined(KLD_MODULE) || defined(ACTUALLY_LKM_NOT_KERNEL)
/*
 * The following set of macros works for UP kernel as well, but for maximum
 * performance we allow the global variables to be accessed directly. On the
 * other hand, kernel modules should always use these macros to maintain
 * portability between UP and SMP kernels.
 */
#define	curproc		GLOBAL_RVALUE_NV(curproc, struct proc *)
#define	curpcb		GLOBAL_RVALUE_NV(curpcb, struct pcb *)
#define	npxproc		GLOBAL_LVALUE(npxproc, struct proc *)
#define	common_tss	GLOBAL_LVALUE(common_tss, struct i386tss)
#define	switchtime	GLOBAL_LVALUE(switchtime, struct timeval)
#define	switchticks	GLOBAL_LVALUE(switchticks, int)

#define	common_tssd	GLOBAL_LVALUE(common_tssd, struct segment_descriptor)
#define	tss_gdt		GLOBAL_LVALUE(tss_gdt, struct segment_descriptor *)

#ifdef USER_LDT
#define	currentldt	GLOBAL_LVALUE(currentldt, int)
#endif

#ifdef SMP
#define	cpuid		GLOBAL_RVALUE(cpuid, u_int)
#define	other_cpus	GLOBAL_LVALUE(other_cpus, u_int)
#define	inside_intr	GLOBAL_LVALUE(inside_intr, int)
#define	prv_CMAP1	GLOBAL_LVALUE(prv_CMAP1, pt_entry_t *)
#define	prv_CMAP2	GLOBAL_LVALUE(prv_CMAP2, pt_entry_t *)
#define	prv_CMAP3	GLOBAL_LVALUE(prv_CMAP3, pt_entry_t *)
#define	prv_PMAP1	GLOBAL_LVALUE(prv_PMAP1, pt_entry_t *)
#define	prv_CADDR1	GLOBAL_RVALUE(prv_CADDR1, caddr_t)
#define	prv_CADDR2	GLOBAL_RVALUE(prv_CADDR2, caddr_t)
#define	prv_CADDR3	GLOBAL_RVALUE(prv_CADDR3, caddr_t)
#define	prv_PADDR1	GLOBAL_RVALUE(prv_PADDR1, unsigned *)
#endif
#endif	/*UP kernel*/

GLOBAL_FUNC(curproc)
GLOBAL_FUNC(curpcb)
GLOBAL_FUNC(npxproc)
GLOBAL_FUNC(common_tss)
GLOBAL_FUNC(switchtime)
GLOBAL_FUNC(switchticks)

GLOBAL_FUNC(common_tssd)
GLOBAL_FUNC(tss_gdt)

#ifdef USER_LDT
GLOBAL_FUNC(currentldt)
#endif

#ifdef SMP
GLOBAL_FUNC(cpuid)
GLOBAL_FUNC(other_cpus)
GLOBAL_FUNC(inside_intr)
GLOBAL_FUNC(prv_CMAP1)
GLOBAL_FUNC(prv_CMAP2)
GLOBAL_FUNC(prv_CMAP3)
GLOBAL_FUNC(prv_PMAP1)
GLOBAL_FUNC(prv_CADDR1)
GLOBAL_FUNC(prv_CADDR2)
GLOBAL_FUNC(prv_CADDR3)
GLOBAL_FUNC(prv_PADDR1)
#endif

#define	SET_CURPROC(x)	(_global_curproc_set_nv((int)x))

#endif	/* KERNEL */

#endif	/* !_MACHINE_GLOBALS_H_ */
OpenPOWER on IntegriCloud