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/11.2/sys/i386/include/pcpu.h 334152 2018-05-24 13:17:24Z kib $
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 #include <sys/_lock.h>
40 #include <sys/_mutex.h>
41
42 /*
43 * The SMP parts are setup in pmap.c and locore.s for the BSP, and
44 * mp_machdep.c sets up the data for the AP's to "see" when they awake.
45 * The reason for doing it via a struct is so that an array of pointers
46 * to each CPU's data can be set up for things like "check curproc on all
47 * other processors"
48 */
49
50 #define PCPU_MD_FIELDS \
51 char pc_monitorbuf[128] __aligned(128); /* cache line */ \
52 struct pcpu *pc_prvspace; /* Self-reference */ \
53 struct pmap *pc_curpmap; \
54 struct i386tss pc_common_tss; \
55 struct segment_descriptor pc_common_tssd; \
56 struct segment_descriptor *pc_tss_gdt; \
57 struct segment_descriptor *pc_fsgs_gdt; \
58 int pc_currentldt; \
59 u_int pc_acpi_id; /* ACPI CPU id */ \
60 u_int pc_apic_id; \
61 int pc_private_tss; /* Flag indicating private tss*/\
62 u_int pc_cmci_mask; /* MCx banks for CMCI */ \
63 u_int pc_vcpu_id; /* Xen vCPU ID */ \
64 struct mtx pc_cmap_lock; \
65 void *pc_cmap_pte1; \
66 void *pc_cmap_pte2; \
67 caddr_t pc_cmap_addr1; \
68 caddr_t pc_cmap_addr2; \
69 vm_offset_t pc_qmap_addr; /* KVA for temporary mappings */\
70 uint32_t pc_smp_tlb_done; /* TLB op acknowledgement */ \
71 uint32_t pc_ibpb_set; \
72 char __pad[185]
73
74 #ifdef _KERNEL
75
76 #ifdef lint
77
78 extern struct pcpu *pcpup;
79
80 #define get_pcpu() (pcpup)
81 #define PCPU_GET(member) (pcpup->pc_ ## member)
82 #define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val))
83 #define PCPU_INC(member) PCPU_ADD(member, 1)
84 #define PCPU_PTR(member) (&pcpup->pc_ ## member)
85 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val))
86
87 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
88
89 /*
90 * Evaluates to the byte offset of the per-cpu variable name.
91 */
92 #define __pcpu_offset(name) \
93 __offsetof(struct pcpu, name)
94
95 /*
96 * Evaluates to the type of the per-cpu variable name.
97 */
98 #define __pcpu_type(name) \
99 __typeof(((struct pcpu *)0)->name)
100
101 /*
102 * Evaluates to the address of the per-cpu variable name.
103 */
104 #define __PCPU_PTR(name) __extension__ ({ \
105 __pcpu_type(name) *__p; \
106 \
107 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \
108 : "=r" (__p) \
109 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \
110 "i" (__pcpu_offset(name))); \
111 \
112 __p; \
113 })
114
115 /*
116 * Evaluates to the value of the per-cpu variable name.
117 */
118 #define __PCPU_GET(name) __extension__ ({ \
119 __pcpu_type(name) __res; \
120 struct __s { \
121 u_char __b[MIN(sizeof(__res), 4)]; \
122 } __s; \
123 \
124 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \
125 sizeof(__res) == 4) { \
126 __asm __volatile("mov %%fs:%1,%0" \
127 : "=r" (__s) \
128 : "m" (*(struct __s *)(__pcpu_offset(name)))); \
129 *(struct __s *)(void *)&__res = __s; \
130 } else { \
131 __res = *__PCPU_PTR(name); \
132 } \
133 __res; \
134 })
135
136 /*
137 * Adds a value of the per-cpu counter name. The implementation
138 * must be atomic with respect to interrupts.
139 */
140 #define __PCPU_ADD(name, val) do { \
141 __pcpu_type(name) __val; \
142 struct __s { \
143 u_char __b[MIN(sizeof(__val), 4)]; \
144 } __s; \
145 \
146 __val = (val); \
147 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
148 sizeof(__val) == 4) { \
149 __s = *(struct __s *)(void *)&__val; \
150 __asm __volatile("add %1,%%fs:%0" \
151 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
152 : "r" (__s)); \
153 } else \
154 *__PCPU_PTR(name) += __val; \
155 } while (0)
156
157 /*
158 * Increments the value of the per-cpu counter name. The implementation
159 * must be atomic with respect to interrupts.
160 */
161 #define __PCPU_INC(name) do { \
162 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \
163 sizeof(__pcpu_type(name)) == 2 || \
164 sizeof(__pcpu_type(name)) == 4); \
165 if (sizeof(__pcpu_type(name)) == 1) { \
166 __asm __volatile("incb %%fs:%0" \
167 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
168 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
169 } else if (sizeof(__pcpu_type(name)) == 2) { \
170 __asm __volatile("incw %%fs:%0" \
171 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
172 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
173 } else if (sizeof(__pcpu_type(name)) == 4) { \
174 __asm __volatile("incl %%fs:%0" \
175 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
176 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
177 } \
178 } while (0)
179
180 /*
181 * Sets the value of the per-cpu variable name to value val.
182 */
183 #define __PCPU_SET(name, val) do { \
184 __pcpu_type(name) __val; \
185 struct __s { \
186 u_char __b[MIN(sizeof(__val), 4)]; \
187 } __s; \
188 \
189 __val = (val); \
190 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
191 sizeof(__val) == 4) { \
192 __s = *(struct __s *)(void *)&__val; \
193 __asm __volatile("mov %1,%%fs:%0" \
194 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
195 : "r" (__s)); \
196 } else { \
197 *__PCPU_PTR(name) = __val; \
198 } \
199 } while (0)
200
201 #define get_pcpu() __extension__ ({ \
202 struct pcpu *__pc; \
203 \
204 __asm __volatile("movl %%fs:%1,%0" \
205 : "=r" (__pc) \
206 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace)))); \
207 __pc; \
208 })
209
210 #define PCPU_GET(member) __PCPU_GET(pc_ ## member)
211 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val)
212 #define PCPU_INC(member) __PCPU_INC(pc_ ## member)
213 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member)
214 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val)
215
216 #define OFFSETOF_CURTHREAD 0
217 #ifdef __clang__
218 #pragma clang diagnostic push
219 #pragma clang diagnostic ignored "-Wnull-dereference"
220 #endif
221 static __inline __pure2 struct thread *
222 __curthread(void)
223 {
224 struct thread *td;
225
226 __asm("movl %%fs:%1,%0" : "=r" (td)
227 : "m" (*(char *)OFFSETOF_CURTHREAD));
228 return (td);
229 }
230 #ifdef __clang__
231 #pragma clang diagnostic pop
232 #endif
233 #define curthread (__curthread())
234
235 #define OFFSETOF_CURPCB 16
236 static __inline __pure2 struct pcb *
237 __curpcb(void)
238 {
239 struct pcb *pcb;
240
241 __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB));
242 return (pcb);
243 }
244 #define curpcb (__curpcb())
245
246 #define IS_BSP() (PCPU_GET(cpuid) == 0)
247
248 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
249
250 #error "this file needs to be ported to your compiler"
251
252 #endif /* lint, etc. */
253
254 #endif /* _KERNEL */
255
256 #endif /* !_MACHINE_PCPU_H_ */
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