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: stable/9/sys/i386/include/pcpu.h 266269 2014-05-16 19:28:22Z cperciva $
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) || defined(XENHVM)
48 #ifndef NR_VIRQS
49 #define NR_VIRQS 24
50 #endif
51 #ifndef NR_IPIS
52 #define NR_IPIS 2
53 #endif
54 #endif
55
56 #if defined(XEN)
57
58 /* These are peridically updated in shared_info, and then copied here. */
59 struct shadow_time_info {
60 uint64_t tsc_timestamp; /* TSC at last update of time vals. */
61 uint64_t system_timestamp; /* Time, in nanosecs, since boot. */
62 uint32_t tsc_to_nsec_mul;
63 uint32_t tsc_to_usec_mul;
64 int tsc_shift;
65 uint32_t version;
66 };
67
68 #define PCPU_XEN_FIELDS \
69 ; \
70 u_int pc_cr3; /* track cr3 for R1/R3*/ \
71 vm_paddr_t *pc_pdir_shadow; \
72 uint64_t pc_processed_system_time; \
73 struct shadow_time_info pc_shadow_time; \
74 int pc_resched_irq; \
75 int pc_callfunc_irq; \
76 int pc_virq_to_irq[NR_VIRQS]; \
77 int pc_ipi_to_irq[NR_IPIS]
78
79 #elif defined(XENHVM) && !defined(MODXENHVM)
80
81 /* This is now unused, but remains here for KBI compatibility reasons. */
82 #define PCPU_XEN_FIELDS \
83 ; \
84 unsigned int pc_last_processed_l1i; \
85 unsigned int pc_last_processed_l2i
86
87 #else /* !XEN && (!XENHVM || MODXENHVM) */
88
89 #define PCPU_XEN_FIELDS
90
91 #endif
92
93 #define PCPU_MD_FIELDS \
94 char pc_monitorbuf[128] __aligned(128); /* cache line */ \
95 struct pcpu *pc_prvspace; /* Self-reference */ \
96 struct pmap *pc_curpmap; \
97 struct i386tss pc_common_tss; \
98 struct segment_descriptor pc_common_tssd; \
99 struct segment_descriptor *pc_tss_gdt; \
100 struct segment_descriptor *pc_fsgs_gdt; \
101 int pc_currentldt; \
102 u_int pc_acpi_id; /* ACPI CPU id */ \
103 u_int pc_apic_id; \
104 int pc_private_tss; /* Flag indicating private tss*/\
105 u_int pc_cmci_mask /* MCx banks for CMCI */ \
106 PCPU_XEN_FIELDS
107
108 #ifdef _KERNEL
109
110 #ifdef lint
111
112 extern struct pcpu *pcpup;
113
114 #define PCPU_GET(member) (pcpup->pc_ ## member)
115 #define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val))
116 #define PCPU_INC(member) PCPU_ADD(member, 1)
117 #define PCPU_PTR(member) (&pcpup->pc_ ## member)
118 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val))
119
120 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
121
122 /*
123 * Evaluates to the byte offset of the per-cpu variable name.
124 */
125 #define __pcpu_offset(name) \
126 __offsetof(struct pcpu, name)
127
128 /*
129 * Evaluates to the type of the per-cpu variable name.
130 */
131 #define __pcpu_type(name) \
132 __typeof(((struct pcpu *)0)->name)
133
134 /*
135 * Evaluates to the address of the per-cpu variable name.
136 */
137 #define __PCPU_PTR(name) __extension__ ({ \
138 __pcpu_type(name) *__p; \
139 \
140 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \
141 : "=r" (__p) \
142 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \
143 "i" (__pcpu_offset(name))); \
144 \
145 __p; \
146 })
147
148 /*
149 * Evaluates to the value of the per-cpu variable name.
150 */
151 #define __PCPU_GET(name) __extension__ ({ \
152 __pcpu_type(name) __res; \
153 struct __s { \
154 u_char __b[MIN(sizeof(__res), 4)]; \
155 } __s; \
156 \
157 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \
158 sizeof(__res) == 4) { \
159 __asm __volatile("mov %%fs:%1,%0" \
160 : "=r" (__s) \
161 : "m" (*(struct __s *)(__pcpu_offset(name)))); \
162 *(struct __s *)(void *)&__res = __s; \
163 } else { \
164 __res = *__PCPU_PTR(name); \
165 } \
166 __res; \
167 })
168
169 /*
170 * Adds a value of the per-cpu counter name. The implementation
171 * must be atomic with respect to interrupts.
172 */
173 #define __PCPU_ADD(name, val) do { \
174 __pcpu_type(name) __val; \
175 struct __s { \
176 u_char __b[MIN(sizeof(__val), 4)]; \
177 } __s; \
178 \
179 __val = (val); \
180 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
181 sizeof(__val) == 4) { \
182 __s = *(struct __s *)(void *)&__val; \
183 __asm __volatile("add %1,%%fs:%0" \
184 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
185 : "r" (__s)); \
186 } else \
187 *__PCPU_PTR(name) += __val; \
188 } while (0)
189
190 /*
191 * Increments the value of the per-cpu counter name. The implementation
192 * must be atomic with respect to interrupts.
193 */
194 #define __PCPU_INC(name) do { \
195 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \
196 sizeof(__pcpu_type(name)) == 2 || \
197 sizeof(__pcpu_type(name)) == 4); \
198 if (sizeof(__pcpu_type(name)) == 1) { \
199 __asm __volatile("incb %%fs:%0" \
200 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
201 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
202 } else if (sizeof(__pcpu_type(name)) == 2) { \
203 __asm __volatile("incw %%fs:%0" \
204 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
205 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
206 } else if (sizeof(__pcpu_type(name)) == 4) { \
207 __asm __volatile("incl %%fs:%0" \
208 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
209 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
210 } \
211 } while (0)
212
213 /*
214 * Sets the value of the per-cpu variable name to value val.
215 */
216 #define __PCPU_SET(name, val) do { \
217 __pcpu_type(name) __val; \
218 struct __s { \
219 u_char __b[MIN(sizeof(__val), 4)]; \
220 } __s; \
221 \
222 __val = (val); \
223 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
224 sizeof(__val) == 4) { \
225 __s = *(struct __s *)(void *)&__val; \
226 __asm __volatile("mov %1,%%fs:%0" \
227 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
228 : "r" (__s)); \
229 } else { \
230 *__PCPU_PTR(name) = __val; \
231 } \
232 } while (0)
233
234 #define PCPU_GET(member) __PCPU_GET(pc_ ## member)
235 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val)
236 #define PCPU_INC(member) __PCPU_INC(pc_ ## member)
237 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member)
238 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val)
239
240 #define OFFSETOF_CURTHREAD 0
241 #ifdef __clang__
242 #pragma clang diagnostic push
243 #pragma clang diagnostic ignored "-Wnull-dereference"
244 #endif
245 static __inline __pure2 struct thread *
__curthread(void)246 __curthread(void)
247 {
248 struct thread *td;
249
250 __asm("movl %%fs:%1,%0" : "=r" (td)
251 : "m" (*(char *)OFFSETOF_CURTHREAD));
252 return (td);
253 }
254 #ifdef __clang__
255 #pragma clang diagnostic pop
256 #endif
257 #define curthread (__curthread())
258
259 #define OFFSETOF_CURPCB 16
260 static __inline __pure2 struct pcb *
__curpcb(void)261 __curpcb(void)
262 {
263 struct pcb *pcb;
264
265 __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB));
266 return (pcb);
267 }
268 #define curpcb (__curpcb())
269
270 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
271
272 #error "this file needs to be ported to your compiler"
273
274 #endif /* lint, etc. */
275
276 #endif /* _KERNEL */
277
278 #endif /* !_MACHINE_PCPU_H_ */
279