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: releng/7.4/sys/i386/include/pcpu.h 210902 2010-08-05 22:04:07Z jhb $
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 u_int pc_cmci_mask /* MCx banks for CMCI */ \
58
59
60 #ifdef _KERNEL
61
62 #ifdef lint
63
64 extern struct pcpu *pcpup;
65
66 #define PCPU_GET(member) (pcpup->pc_ ## member)
67 #define PCPU_ADD(member, val) (pcpu->pc_ ## member += (val))
68 #define PCPU_INC(member) PCPU_ADD(member, 1)
69 #define PCPU_PTR(member) (&pcpup->pc_ ## member)
70 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val))
71
72 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
73
74 /*
75 * Evaluates to the byte offset of the per-cpu variable name.
76 */
77 #define __pcpu_offset(name) \
78 __offsetof(struct pcpu, name)
79
80 /*
81 * Evaluates to the type of the per-cpu variable name.
82 */
83 #define __pcpu_type(name) \
84 __typeof(((struct pcpu *)0)->name)
85
86 /*
87 * Evaluates to the address of the per-cpu variable name.
88 */
89 #define __PCPU_PTR(name) __extension__ ({ \
90 __pcpu_type(name) *__p; \
91 \
92 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \
93 : "=r" (__p) \
94 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \
95 "i" (__pcpu_offset(name))); \
96 \
97 __p; \
98 })
99
100 /*
101 * Evaluates to the value of the per-cpu variable name.
102 */
103 #define __PCPU_GET(name) __extension__ ({ \
104 __pcpu_type(name) __res; \
105 struct __s { \
106 u_char __b[MIN(sizeof(__pcpu_type(name)), 4)]; \
107 } __s; \
108 \
109 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \
110 sizeof(__res) == 4) { \
111 __asm __volatile("mov %%fs:%1,%0" \
112 : "=r" (__s) \
113 : "m" (*(struct __s *)(__pcpu_offset(name)))); \
114 *(struct __s *)(void *)&__res = __s; \
115 } else { \
116 __res = *__PCPU_PTR(name); \
117 } \
118 __res; \
119 })
120
121 /*
122 * Adds a value of the per-cpu counter name. The implementation
123 * must be atomic with respect to interrupts.
124 */
125 #define __PCPU_ADD(name, val) do { \
126 __pcpu_type(name) __val; \
127 struct __s { \
128 u_char __b[MIN(sizeof(__pcpu_type(name)), 4)]; \
129 } __s; \
130 \
131 __val = (val); \
132 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
133 sizeof(__val) == 4) { \
134 __s = *(struct __s *)(void *)&__val; \
135 __asm __volatile("add %1,%%fs:%0" \
136 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
137 : "r" (__s)); \
138 } else \
139 *__PCPU_PTR(name) += __val; \
140 } while (0)
141
142 /*
143 * Increments the value of the per-cpu counter name. The implementation
144 * must be atomic with respect to interrupts.
145 */
146 #define __PCPU_INC(name) do { \
147 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \
148 sizeof(__pcpu_type(name)) == 2 || \
149 sizeof(__pcpu_type(name)) == 4); \
150 if (sizeof(__pcpu_type(name)) == 1) { \
151 __asm __volatile("incb %%fs:%0" \
152 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
153 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
154 } else if (sizeof(__pcpu_type(name)) == 2) { \
155 __asm __volatile("incw %%fs:%0" \
156 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
157 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
158 } else if (sizeof(__pcpu_type(name)) == 4) { \
159 __asm __volatile("incl %%fs:%0" \
160 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
161 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
162 } \
163 } while (0)
164
165 /*
166 * Sets the value of the per-cpu variable name to value val.
167 */
168 #define __PCPU_SET(name, val) { \
169 __pcpu_type(name) __val; \
170 struct __s { \
171 u_char __b[MIN(sizeof(__pcpu_type(name)), 4)]; \
172 } __s; \
173 \
174 __val = (val); \
175 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
176 sizeof(__val) == 4) { \
177 __s = *(struct __s *)(void *)&__val; \
178 __asm __volatile("mov %1,%%fs:%0" \
179 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
180 : "r" (__s)); \
181 } else { \
182 *__PCPU_PTR(name) = __val; \
183 } \
184 }
185
186 #define PCPU_GET(member) __PCPU_GET(pc_ ## member)
187 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val)
188 #define PCPU_INC(member) __PCPU_INC(pc_ ## member)
189 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member)
190 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val)
191
192 static __inline __pure2 struct thread *
193 __curthread(void)
194 {
195 struct thread *td;
196
197 __asm("movl %%fs:0,%0" : "=r" (td));
198 return (td);
199 }
200 #define curthread (__curthread())
201
202 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
203
204 #error "this file needs to be ported to your compiler"
205
206 #endif /* lint, etc. */
207
208 #endif /* _KERNEL */
209
210 #endif /* !_MACHINE_PCPU_H_ */
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