1 /*-
2 * Copyright (c) Peter Wemm <peter@netplex.com.au>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: releng/6.0/sys/i386/include/pcpu.h 145034 2005-04-13 22:57:17Z peter $
27 */
28
29 #ifndef _MACHINE_PCPU_H_
30 #define _MACHINE_PCPU_H_
31
32 #ifndef _SYS_CDEFS_H_
33 #error this file needs sys/cdefs.h as a prerequisite
34 #endif
35
36 #ifdef _KERNEL
37
38 #include <machine/segments.h>
39 #include <machine/tss.h>
40
41 /*
42 * The SMP parts are setup in pmap.c and locore.s for the BSP, and
43 * mp_machdep.c sets up the data for the AP's to "see" when they awake.
44 * The reason for doing it via a struct is so that an array of pointers
45 * to each CPU's data can be set up for things like "check curproc on all
46 * other processors"
47 */
48 #define PCPU_MD_FIELDS \
49 struct pcpu *pc_prvspace; /* Self-reference */ \
50 struct pmap *pc_curpmap; \
51 struct i386tss pc_common_tss; \
52 struct segment_descriptor pc_common_tssd; \
53 struct segment_descriptor *pc_tss_gdt; \
54 struct segment_descriptor *pc_fsgs_gdt; \
55 int pc_currentldt; \
56 u_int pc_acpi_id; \
57 u_int pc_apic_id
58
59 #if defined(lint)
60
61 extern struct pcpu *pcpup;
62
63 #define PCPU_GET(member) (pcpup->pc_ ## member)
64 #define PCPU_PTR(member) (&pcpup->pc_ ## member)
65 #define PCPU_SET(member,value) (pcpup->pc_ ## member = (value))
66
67 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) \
68 && defined(__GNUCLIKE___OFFSETOF)
69
70 /*
71 * Evaluates to the byte offset of the per-cpu variable name.
72 */
73 #define __pcpu_offset(name) \
74 __offsetof(struct pcpu, name)
75
76 /*
77 * Evaluates to the type of the per-cpu variable name.
78 */
79 #define __pcpu_type(name) \
80 __typeof(((struct pcpu *)0)->name)
81
82 /*
83 * Evaluates to the address of the per-cpu variable name.
84 */
85 #define __PCPU_PTR(name) __extension__ ({ \
86 __pcpu_type(name) *__p; \
87 \
88 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \
89 : "=r" (__p) \
90 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \
91 "i" (__pcpu_offset(name))); \
92 \
93 __p; \
94 })
95
96 /*
97 * Evaluates to the value of the per-cpu variable name.
98 */
99 #define __PCPU_GET(name) __extension__ ({ \
100 __pcpu_type(name) __result; \
101 \
102 if (sizeof(__result) == 1) { \
103 u_char __b; \
104 __asm __volatile("movb %%fs:%1,%0" \
105 : "=r" (__b) \
106 : "m" (*(u_char *)(__pcpu_offset(name)))); \
107 __result = *(__pcpu_type(name) *)(void *)&__b; \
108 } else if (sizeof(__result) == 2) { \
109 u_short __w; \
110 __asm __volatile("movw %%fs:%1,%0" \
111 : "=r" (__w) \
112 : "m" (*(u_short *)(__pcpu_offset(name)))); \
113 __result = *(__pcpu_type(name) *)(void *)&__w; \
114 } else if (sizeof(__result) == 4) { \
115 u_int __i; \
116 __asm __volatile("movl %%fs:%1,%0" \
117 : "=r" (__i) \
118 : "m" (*(u_int *)(__pcpu_offset(name)))); \
119 __result = *(__pcpu_type(name) *)(void *)&__i; \
120 } else { \
121 __result = *__PCPU_PTR(name); \
122 } \
123 \
124 __result; \
125 })
126
127 /*
128 * Sets the value of the per-cpu variable name to value val.
129 */
130 #define __PCPU_SET(name, val) { \
131 __pcpu_type(name) __val = (val); \
132 \
133 if (sizeof(__val) == 1) { \
134 u_char __b; \
135 __b = *(u_char *)&__val; \
136 __asm __volatile("movb %1,%%fs:%0" \
137 : "=m" (*(u_char *)(__pcpu_offset(name))) \
138 : "r" (__b)); \
139 } else if (sizeof(__val) == 2) { \
140 u_short __w; \
141 __w = *(u_short *)&__val; \
142 __asm __volatile("movw %1,%%fs:%0" \
143 : "=m" (*(u_short *)(__pcpu_offset(name))) \
144 : "r" (__w)); \
145 } else if (sizeof(__val) == 4) { \
146 u_int __i; \
147 __i = *(u_int *)&__val; \
148 __asm __volatile("movl %1,%%fs:%0" \
149 : "=m" (*(u_int *)(__pcpu_offset(name))) \
150 : "r" (__i)); \
151 } else { \
152 *__PCPU_PTR(name) = __val; \
153 } \
154 }
155
156 #define PCPU_GET(member) __PCPU_GET(pc_ ## member)
157 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member)
158 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val)
159
160 static __inline struct thread *
161 __curthread(void)
162 {
163 struct thread *td;
164
165 __asm __volatile("movl %%fs:0,%0" : "=r" (td));
166 return (td);
167 }
168 #define curthread (__curthread())
169
170 #else
171 #error this file needs to be ported to your compiler
172 #endif
173
174 #endif /* _KERNEL */
175
176 #endif /* ! _MACHINE_PCPU_H_ */
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