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
47 #if defined(XEN)
48
49 /* These are peridically updated in shared_info, and then copied here. */
50 struct shadow_time_info {
51 uint64_t tsc_timestamp; /* TSC at last update of time vals. */
52 uint64_t system_timestamp; /* Time, in nanosecs, since boot. */
53 uint32_t tsc_to_nsec_mul;
54 uint32_t tsc_to_usec_mul;
55 int tsc_shift;
56 uint32_t version;
57 };
58
59 #define PCPU_XEN_FIELDS \
60 ; \
61 u_int pc_cr3; /* track cr3 for R1/R3*/ \
62 vm_paddr_t *pc_pdir_shadow; \
63 uint64_t pc_processed_system_time; \
64 struct shadow_time_info pc_shadow_time; \
65 char __pad[185]
66
67 #else /* !XEN */
68
69 #define PCPU_XEN_FIELDS \
70 ; \
71 char __pad[233]
72
73 #endif
74
75 #define PCPU_MD_FIELDS \
76 char pc_monitorbuf[128] __aligned(128); /* cache line */ \
77 struct pcpu *pc_prvspace; /* Self-reference */ \
78 struct pmap *pc_curpmap; \
79 struct i386tss pc_common_tss; \
80 struct segment_descriptor pc_common_tssd; \
81 struct segment_descriptor *pc_tss_gdt; \
82 struct segment_descriptor *pc_fsgs_gdt; \
83 int pc_currentldt; \
84 u_int pc_acpi_id; /* ACPI CPU id */ \
85 u_int pc_apic_id; \
86 int pc_private_tss; /* Flag indicating private tss*/\
87 u_int pc_cmci_mask; /* MCx banks for CMCI */ \
88 u_int pc_vcpu_id /* Xen vCPU ID */ \
89 PCPU_XEN_FIELDS
90
91 #ifdef _KERNEL
92
93 #ifdef lint
94
95 extern struct pcpu *pcpup;
96
97 #define PCPU_GET(member) (pcpup->pc_ ## member)
98 #define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val))
99 #define PCPU_INC(member) PCPU_ADD(member, 1)
100 #define PCPU_PTR(member) (&pcpup->pc_ ## member)
101 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val))
102
103 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
104
105 /*
106 * Evaluates to the byte offset of the per-cpu variable name.
107 */
108 #define __pcpu_offset(name) \
109 __offsetof(struct pcpu, name)
110
111 /*
112 * Evaluates to the type of the per-cpu variable name.
113 */
114 #define __pcpu_type(name) \
115 __typeof(((struct pcpu *)0)->name)
116
117 /*
118 * Evaluates to the address of the per-cpu variable name.
119 */
120 #define __PCPU_PTR(name) __extension__ ({ \
121 __pcpu_type(name) *__p; \
122 \
123 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \
124 : "=r" (__p) \
125 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \
126 "i" (__pcpu_offset(name))); \
127 \
128 __p; \
129 })
130
131 /*
132 * Evaluates to the value of the per-cpu variable name.
133 */
134 #define __PCPU_GET(name) __extension__ ({ \
135 __pcpu_type(name) __res; \
136 struct __s { \
137 u_char __b[MIN(sizeof(__res), 4)]; \
138 } __s; \
139 \
140 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \
141 sizeof(__res) == 4) { \
142 __asm __volatile("mov %%fs:%1,%0" \
143 : "=r" (__s) \
144 : "m" (*(struct __s *)(__pcpu_offset(name)))); \
145 *(struct __s *)(void *)&__res = __s; \
146 } else { \
147 __res = *__PCPU_PTR(name); \
148 } \
149 __res; \
150 })
151
152 /*
153 * Adds a value of the per-cpu counter name. The implementation
154 * must be atomic with respect to interrupts.
155 */
156 #define __PCPU_ADD(name, val) do { \
157 __pcpu_type(name) __val; \
158 struct __s { \
159 u_char __b[MIN(sizeof(__val), 4)]; \
160 } __s; \
161 \
162 __val = (val); \
163 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
164 sizeof(__val) == 4) { \
165 __s = *(struct __s *)(void *)&__val; \
166 __asm __volatile("add %1,%%fs:%0" \
167 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
168 : "r" (__s)); \
169 } else \
170 *__PCPU_PTR(name) += __val; \
171 } while (0)
172
173 /*
174 * Increments the value of the per-cpu counter name. The implementation
175 * must be atomic with respect to interrupts.
176 */
177 #define __PCPU_INC(name) do { \
178 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \
179 sizeof(__pcpu_type(name)) == 2 || \
180 sizeof(__pcpu_type(name)) == 4); \
181 if (sizeof(__pcpu_type(name)) == 1) { \
182 __asm __volatile("incb %%fs:%0" \
183 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
184 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
185 } else if (sizeof(__pcpu_type(name)) == 2) { \
186 __asm __volatile("incw %%fs:%0" \
187 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
188 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
189 } else if (sizeof(__pcpu_type(name)) == 4) { \
190 __asm __volatile("incl %%fs:%0" \
191 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
192 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
193 } \
194 } while (0)
195
196 /*
197 * Sets the value of the per-cpu variable name to value val.
198 */
199 #define __PCPU_SET(name, val) do { \
200 __pcpu_type(name) __val; \
201 struct __s { \
202 u_char __b[MIN(sizeof(__val), 4)]; \
203 } __s; \
204 \
205 __val = (val); \
206 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
207 sizeof(__val) == 4) { \
208 __s = *(struct __s *)(void *)&__val; \
209 __asm __volatile("mov %1,%%fs:%0" \
210 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
211 : "r" (__s)); \
212 } else { \
213 *__PCPU_PTR(name) = __val; \
214 } \
215 } while (0)
216
217 #define PCPU_GET(member) __PCPU_GET(pc_ ## member)
218 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val)
219 #define PCPU_INC(member) __PCPU_INC(pc_ ## member)
220 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member)
221 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val)
222
223 #define OFFSETOF_CURTHREAD 0
224 #ifdef __clang__
225 #pragma clang diagnostic push
226 #pragma clang diagnostic ignored "-Wnull-dereference"
227 #endif
228 static __inline __pure2 struct thread *
229 __curthread(void)
230 {
231 struct thread *td;
232
233 __asm("movl %%fs:%1,%0" : "=r" (td)
234 : "m" (*(char *)OFFSETOF_CURTHREAD));
235 return (td);
236 }
237 #ifdef __clang__
238 #pragma clang diagnostic pop
239 #endif
240 #define curthread (__curthread())
241
242 #define OFFSETOF_CURPCB 16
243 static __inline __pure2 struct pcb *
244 __curpcb(void)
245 {
246 struct pcb *pcb;
247
248 __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB));
249 return (pcb);
250 }
251 #define curpcb (__curpcb())
252
253 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
254
255 #error "this file needs to be ported to your compiler"
256
257 #endif /* lint, etc. */
258
259 #endif /* _KERNEL */
260
261 #endif /* !_MACHINE_PCPU_H_ */
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