1 /*-
2 * Copyright (c) Peter Wemm <peter@netplex.com.au>
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 /*
37 * The SMP parts are setup in pmap.c and locore.s for the BSP, and
38 * mp_machdep.c sets up the data for the AP's to "see" when they awake.
39 * The reason for doing it via a struct is so that an array of pointers
40 * to each CPU's data can be set up for things like "check curproc on all
41 * other processors"
42 */
43 #define PCPU_MD_FIELDS \
44 char pc_monitorbuf[128] __aligned(128); /* cache line */ \
45 struct pcpu *pc_prvspace; /* Self-reference */ \
46 struct pmap *pc_curpmap; \
47 struct amd64tss *pc_tssp; /* TSS segment active on CPU */ \
48 struct amd64tss *pc_commontssp;/* Common TSS for the CPU */ \
49 register_t pc_rsp0; \
50 register_t pc_scratch_rsp; /* User %rsp in syscall */ \
51 u_int pc_apic_id; \
52 u_int pc_acpi_id; /* ACPI CPU id */ \
53 /* Pointer to the CPU %fs descriptor */ \
54 struct user_segment_descriptor *pc_fs32p; \
55 /* Pointer to the CPU %gs descriptor */ \
56 struct user_segment_descriptor *pc_gs32p; \
57 /* Pointer to the CPU LDT descriptor */ \
58 struct system_segment_descriptor *pc_ldt; \
59 /* Pointer to the CPU TSS descriptor */ \
60 struct system_segment_descriptor *pc_tss; \
61 uint64_t pc_pm_save_cnt; \
62 u_int pc_cmci_mask; /* MCx banks for CMCI */ \
63 uint64_t pc_dbreg[16]; /* ddb debugging regs */ \
64 int pc_dbreg_cmd; /* ddb debugging reg cmd */ \
65 u_int pc_vcpu_id; /* Xen vCPU ID */ \
66 char __pad[157] /* be divisor of PAGE_SIZE \
67 after cache alignment */
68
69 #define PC_DBREG_CMD_NONE 0
70 #define PC_DBREG_CMD_LOAD 1
71
72 #ifdef _KERNEL
73
74 #ifdef lint
75
76 extern struct pcpu *pcpup;
77
78 #define PCPU_GET(member) (pcpup->pc_ ## member)
79 #define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val))
80 #define PCPU_INC(member) PCPU_ADD(member, 1)
81 #define PCPU_PTR(member) (&pcpup->pc_ ## member)
82 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val))
83
84 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
85
86 /*
87 * Evaluates to the byte offset of the per-cpu variable name.
88 */
89 #define __pcpu_offset(name) \
90 __offsetof(struct pcpu, name)
91
92 /*
93 * Evaluates to the type of the per-cpu variable name.
94 */
95 #define __pcpu_type(name) \
96 __typeof(((struct pcpu *)0)->name)
97
98 /*
99 * Evaluates to the address of the per-cpu variable name.
100 */
101 #define __PCPU_PTR(name) __extension__ ({ \
102 __pcpu_type(name) *__p; \
103 \
104 __asm __volatile("movq %%gs:%1,%0; addq %2,%0" \
105 : "=r" (__p) \
106 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \
107 "i" (__pcpu_offset(name))); \
108 \
109 __p; \
110 })
111
112 /*
113 * Evaluates to the value of the per-cpu variable name.
114 */
115 #define __PCPU_GET(name) __extension__ ({ \
116 __pcpu_type(name) __res; \
117 struct __s { \
118 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \
119 } __s; \
120 \
121 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \
122 sizeof(__res) == 4 || sizeof(__res) == 8) { \
123 __asm __volatile("mov %%gs:%1,%0" \
124 : "=r" (__s) \
125 : "m" (*(struct __s *)(__pcpu_offset(name)))); \
126 *(struct __s *)(void *)&__res = __s; \
127 } else { \
128 __res = *__PCPU_PTR(name); \
129 } \
130 __res; \
131 })
132
133 /*
134 * Adds the value to the per-cpu counter name. The implementation
135 * must be atomic with respect to interrupts.
136 */
137 #define __PCPU_ADD(name, val) do { \
138 __pcpu_type(name) __val; \
139 struct __s { \
140 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \
141 } __s; \
142 \
143 __val = (val); \
144 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
145 sizeof(__val) == 4 || sizeof(__val) == 8) { \
146 __s = *(struct __s *)(void *)&__val; \
147 __asm __volatile("add %1,%%gs:%0" \
148 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
149 : "r" (__s)); \
150 } else \
151 *__PCPU_PTR(name) += __val; \
152 } while (0)
153
154 /*
155 * Increments the value of the per-cpu counter name. The implementation
156 * must be atomic with respect to interrupts.
157 */
158 #define __PCPU_INC(name) do { \
159 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \
160 sizeof(__pcpu_type(name)) == 2 || \
161 sizeof(__pcpu_type(name)) == 4 || \
162 sizeof(__pcpu_type(name)) == 8); \
163 if (sizeof(__pcpu_type(name)) == 1) { \
164 __asm __volatile("incb %%gs:%0" \
165 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
166 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
167 } else if (sizeof(__pcpu_type(name)) == 2) { \
168 __asm __volatile("incw %%gs:%0" \
169 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
170 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
171 } else if (sizeof(__pcpu_type(name)) == 4) { \
172 __asm __volatile("incl %%gs:%0" \
173 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
174 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
175 } else if (sizeof(__pcpu_type(name)) == 8) { \
176 __asm __volatile("incq %%gs:%0" \
177 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
178 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
179 } \
180 } while (0)
181
182 /*
183 * Sets the value of the per-cpu variable name to value val.
184 */
185 #define __PCPU_SET(name, val) { \
186 __pcpu_type(name) __val; \
187 struct __s { \
188 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \
189 } __s; \
190 \
191 __val = (val); \
192 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
193 sizeof(__val) == 4 || sizeof(__val) == 8) { \
194 __s = *(struct __s *)(void *)&__val; \
195 __asm __volatile("mov %1,%%gs:%0" \
196 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
197 : "r" (__s)); \
198 } else { \
199 *__PCPU_PTR(name) = __val; \
200 } \
201 }
202
203 #define PCPU_GET(member) __PCPU_GET(pc_ ## member)
204 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val)
205 #define PCPU_INC(member) __PCPU_INC(pc_ ## member)
206 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member)
207 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val)
208
209 #define OFFSETOF_CURTHREAD 0
210 #ifdef __clang__
211 #pragma clang diagnostic push
212 #pragma clang diagnostic ignored "-Wnull-dereference"
213 #endif
214 static __inline __pure2 struct thread *
__curthread(void)215 __curthread(void)
216 {
217 struct thread *td;
218
219 __asm("movq %%gs:%1,%0" : "=r" (td)
220 : "m" (*(char *)OFFSETOF_CURTHREAD));
221 return (td);
222 }
223 #ifdef __clang__
224 #pragma clang diagnostic pop
225 #endif
226 #define curthread (__curthread())
227
228 #define OFFSETOF_CURPCB 32
229 static __inline __pure2 struct pcb *
__curpcb(void)230 __curpcb(void)
231 {
232 struct pcb *pcb;
233
234 __asm("movq %%gs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB));
235 return (pcb);
236 }
237 #define curpcb (__curpcb())
238
239 #define IS_BSP() (PCPU_GET(cpuid) == 0)
240
241 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
242
243 #error "this file needs to be ported to your compiler"
244
245 #endif /* lint, etc. */
246
247 #endif /* _KERNEL */
248
249 #endif /* !_MACHINE_PCPU_H_ */
250