1 /*-
2 * Copyright (c) Peter Wemm
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 * $FreeBSD$
27 */
28
29 #ifndef _MACHINE_PCPU_H_
30 #define _MACHINE_PCPU_H_
31
32 #ifndef _SYS_CDEFS_H_
33 #error "sys/cdefs.h is a prerequisite for this file"
34 #endif
35
36 #include <machine/segments.h>
37 #include <machine/tss.h>
38
39 /*
40 * The SMP parts are setup in pmap.c and locore.s for the BSP, and
41 * mp_machdep.c sets up the data for the AP's to "see" when they awake.
42 * The reason for doing it via a struct is so that an array of pointers
43 * to each CPU's data can be set up for things like "check curproc on all
44 * other processors"
45 */
46 #define PCPU_MD_FIELDS \
47 struct pcpu *pc_prvspace; /* Self-reference */ \
48 struct pmap *pc_curpmap; \
49 struct i386tss pc_common_tss; \
50 struct segment_descriptor pc_common_tssd; \
51 struct segment_descriptor *pc_tss_gdt; \
52 struct segment_descriptor *pc_fsgs_gdt; \
53 int pc_currentldt; \
54 u_int pc_acpi_id; /* ACPI CPU id */ \
55 u_int pc_apic_id; \
56 int pc_private_tss /* Flag indicating private tss */
57
58
59 #ifdef _KERNEL
60
61 #ifdef lint
62
63 extern struct pcpu *pcpup;
64
65 #define PCPU_GET(member) (pcpup->pc_ ## member)
66 #define PCPU_ADD(member, val) (pcpu->pc_ ## member += (val))
67 #define PCPU_INC(member) PCPU_ADD(member, 1)
68 #define PCPU_PTR(member) (&pcpup->pc_ ## member)
69 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val))
70
71 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
72
73 /*
74 * Evaluates to the byte offset of the per-cpu variable name.
75 */
76 #define __pcpu_offset(name) \
77 __offsetof(struct pcpu, name)
78
79 /*
80 * Evaluates to the type of the per-cpu variable name.
81 */
82 #define __pcpu_type(name) \
83 __typeof(((struct pcpu *)0)->name)
84
85 /*
86 * Evaluates to the address of the per-cpu variable name.
87 */
88 #define __PCPU_PTR(name) __extension__ ({ \
89 __pcpu_type(name) *__p; \
90 \
91 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \
92 : "=r" (__p) \
93 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \
94 "i" (__pcpu_offset(name))); \
95 \
96 __p; \
97 })
98
99 /*
100 * Evaluates to the value of the per-cpu variable name.
101 */
102 #define __PCPU_GET(name) __extension__ ({ \
103 __pcpu_type(name) __res; \
104 struct __s { \
105 u_char __b[MIN(sizeof(__pcpu_type(name)), 4)]; \
106 } __s; \
107 \
108 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \
109 sizeof(__res) == 4) { \
110 __asm __volatile("mov %%fs:%1,%0" \
111 : "=r" (__s) \
112 : "m" (*(struct __s *)(__pcpu_offset(name)))); \
113 *(struct __s *)(void *)&__res = __s; \
114 } else { \
115 __res = *__PCPU_PTR(name); \
116 } \
117 __res; \
118 })
119
120 /*
121 * Adds a value of the per-cpu counter name. The implementation
122 * must be atomic with respect to interrupts.
123 */
124 #define __PCPU_ADD(name, val) do { \
125 __pcpu_type(name) __val; \
126 struct __s { \
127 u_char __b[MIN(sizeof(__pcpu_type(name)), 4)]; \
128 } __s; \
129 \
130 __val = (val); \
131 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
132 sizeof(__val) == 4) { \
133 __s = *(struct __s *)(void *)&__val; \
134 __asm __volatile("add %1,%%fs:%0" \
135 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
136 : "r" (__s)); \
137 } else \
138 *__PCPU_PTR(name) += __val; \
139 } while (0)
140
141 /*
142 * Increments the value of the per-cpu counter name. The implementation
143 * must be atomic with respect to interrupts.
144 */
145 #define __PCPU_INC(name) do { \
146 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \
147 sizeof(__pcpu_type(name)) == 2 || \
148 sizeof(__pcpu_type(name)) == 4); \
149 if (sizeof(__pcpu_type(name)) == 1) { \
150 __asm __volatile("incb %%fs:%0" \
151 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
152 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
153 } else if (sizeof(__pcpu_type(name)) == 2) { \
154 __asm __volatile("incw %%fs:%0" \
155 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
156 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
157 } else if (sizeof(__pcpu_type(name)) == 4) { \
158 __asm __volatile("incl %%fs:%0" \
159 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
160 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
161 } \
162 } while (0)
163
164 /*
165 * Sets the value of the per-cpu variable name to value val.
166 */
167 #define __PCPU_SET(name, val) { \
168 __pcpu_type(name) __val; \
169 struct __s { \
170 u_char __b[MIN(sizeof(__pcpu_type(name)), 4)]; \
171 } __s; \
172 \
173 __val = (val); \
174 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
175 sizeof(__val) == 4) { \
176 __s = *(struct __s *)(void *)&__val; \
177 __asm __volatile("mov %1,%%fs:%0" \
178 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
179 : "r" (__s)); \
180 } else { \
181 *__PCPU_PTR(name) = __val; \
182 } \
183 }
184
185 #define PCPU_GET(member) __PCPU_GET(pc_ ## member)
186 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val)
187 #define PCPU_INC(member) __PCPU_INC(pc_ ## member)
188 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member)
189 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val)
190
191 static __inline struct thread *
192 __curthread(void)
193 {
194 struct thread *td;
195
196 __asm __volatile("movl %%fs:0,%0" : "=r" (td));
197 return (td);
198 }
199 #define curthread (__curthread())
200
201 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
202
203 #error "this file needs to be ported to your compiler"
204
205 #endif /* lint, etc. */
206
207 #endif /* _KERNEL */
208
209 #endif /* !_MACHINE_PCPU_H_ */
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