1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) Peter Wemm <[email protected]>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31 #ifndef _MACHINE_PCPU_H_
32 #define _MACHINE_PCPU_H_
33
34 #ifndef _SYS_CDEFS_H_
35 #error "sys/cdefs.h is a prerequisite for this file"
36 #endif
37
38 #define PC_PTI_STACK_SZ 16
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 char pc_monitorbuf[128] __aligned(128); /* cache line */ \
48 struct pcpu *pc_prvspace; /* Self-reference */ \
49 struct pmap *pc_curpmap; \
50 struct amd64tss *pc_tssp; /* TSS segment active on CPU */ \
51 struct amd64tss *pc_commontssp;/* Common TSS for the CPU */ \
52 uint64_t pc_kcr3; \
53 uint64_t pc_ucr3; \
54 uint64_t pc_saved_ucr3; \
55 register_t pc_rsp0; \
56 register_t pc_scratch_rsp; /* User %rsp in syscall */ \
57 register_t pc_scratch_rax; \
58 u_int pc_apic_id; \
59 u_int pc_acpi_id; /* ACPI CPU id */ \
60 /* Pointer to the CPU %fs descriptor */ \
61 struct user_segment_descriptor *pc_fs32p; \
62 /* Pointer to the CPU %gs descriptor */ \
63 struct user_segment_descriptor *pc_gs32p; \
64 /* Pointer to the CPU LDT descriptor */ \
65 struct system_segment_descriptor *pc_ldt; \
66 /* Pointer to the CPU TSS descriptor */ \
67 struct system_segment_descriptor *pc_tss; \
68 uint64_t pc_pm_save_cnt; \
69 u_int pc_cmci_mask; /* MCx banks for CMCI */ \
70 uint64_t pc_dbreg[16]; /* ddb debugging regs */ \
71 uint64_t pc_pti_stack[PC_PTI_STACK_SZ]; \
72 register_t pc_pti_rsp0; \
73 int pc_dbreg_cmd; /* ddb debugging reg cmd */ \
74 u_int pc_vcpu_id; /* Xen vCPU ID */ \
75 uint32_t pc_pcid_next; \
76 uint32_t pc_pcid_gen; \
77 uint32_t pc_smp_tlb_done; /* TLB op acknowledgement */ \
78 uint32_t pc_ibpb_set; \
79 void *pc_mds_buf; \
80 void *pc_mds_buf64; \
81 uint32_t pc_pad[2]; \
82 uint8_t pc_mds_tmp[64]; \
83 char __pad[3176] /* pad to UMA_PCPU_ALLOC_SIZE */
84
85 #define PC_DBREG_CMD_NONE 0
86 #define PC_DBREG_CMD_LOAD 1
87
88 #ifdef _KERNEL
89
90 #if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
91
92 /*
93 * Evaluates to the byte offset of the per-cpu variable name.
94 */
95 #define __pcpu_offset(name) \
96 __offsetof(struct pcpu, name)
97
98 /*
99 * Evaluates to the type of the per-cpu variable name.
100 */
101 #define __pcpu_type(name) \
102 __typeof(((struct pcpu *)0)->name)
103
104 /*
105 * Evaluates to the address of the per-cpu variable name.
106 */
107 #define __PCPU_PTR(name) __extension__ ({ \
108 __pcpu_type(name) *__p; \
109 \
110 __asm __volatile("movq %%gs:%1,%0; addq %2,%0" \
111 : "=r" (__p) \
112 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \
113 "i" (__pcpu_offset(name))); \
114 \
115 __p; \
116 })
117
118 /*
119 * Evaluates to the value of the per-cpu variable name.
120 */
121 #define __PCPU_GET(name) __extension__ ({ \
122 __pcpu_type(name) __res; \
123 struct __s { \
124 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \
125 } __s; \
126 \
127 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \
128 sizeof(__res) == 4 || sizeof(__res) == 8) { \
129 __asm __volatile("mov %%gs:%1,%0" \
130 : "=r" (__s) \
131 : "m" (*(struct __s *)(__pcpu_offset(name)))); \
132 *(struct __s *)(void *)&__res = __s; \
133 } else { \
134 __res = *__PCPU_PTR(name); \
135 } \
136 __res; \
137 })
138
139 /*
140 * Adds the value to the per-cpu counter name. The implementation
141 * must be atomic with respect to interrupts.
142 */
143 #define __PCPU_ADD(name, val) do { \
144 __pcpu_type(name) __val; \
145 struct __s { \
146 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \
147 } __s; \
148 \
149 __val = (val); \
150 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
151 sizeof(__val) == 4 || sizeof(__val) == 8) { \
152 __s = *(struct __s *)(void *)&__val; \
153 __asm __volatile("add %1,%%gs:%0" \
154 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
155 : "r" (__s)); \
156 } else \
157 *__PCPU_PTR(name) += __val; \
158 } while (0)
159
160 /*
161 * Increments the value of the per-cpu counter name. The implementation
162 * must be atomic with respect to interrupts.
163 */
164 #define __PCPU_INC(name) do { \
165 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \
166 sizeof(__pcpu_type(name)) == 2 || \
167 sizeof(__pcpu_type(name)) == 4 || \
168 sizeof(__pcpu_type(name)) == 8); \
169 if (sizeof(__pcpu_type(name)) == 1) { \
170 __asm __volatile("incb %%gs:%0" \
171 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
172 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
173 } else if (sizeof(__pcpu_type(name)) == 2) { \
174 __asm __volatile("incw %%gs:%0" \
175 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
176 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
177 } else if (sizeof(__pcpu_type(name)) == 4) { \
178 __asm __volatile("incl %%gs:%0" \
179 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
180 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
181 } else if (sizeof(__pcpu_type(name)) == 8) { \
182 __asm __volatile("incq %%gs:%0" \
183 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
184 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
185 } \
186 } while (0)
187
188 /*
189 * Sets the value of the per-cpu variable name to value val.
190 */
191 #define __PCPU_SET(name, val) { \
192 __pcpu_type(name) __val; \
193 struct __s { \
194 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \
195 } __s; \
196 \
197 __val = (val); \
198 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
199 sizeof(__val) == 4 || sizeof(__val) == 8) { \
200 __s = *(struct __s *)(void *)&__val; \
201 __asm __volatile("mov %1,%%gs:%0" \
202 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
203 : "r" (__s)); \
204 } else { \
205 *__PCPU_PTR(name) = __val; \
206 } \
207 }
208
209 #define get_pcpu() __extension__ ({ \
210 struct pcpu *__pc; \
211 \
212 __asm __volatile("movq %%gs:%1,%0" \
213 : "=r" (__pc) \
214 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace)))); \
215 __pc; \
216 })
217
218 #define PCPU_GET(member) __PCPU_GET(pc_ ## member)
219 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val)
220 #define PCPU_INC(member) __PCPU_INC(pc_ ## member)
221 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member)
222 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val)
223
224 #define OFFSETOF_CURTHREAD 0
225 #ifdef __clang__
226 #pragma clang diagnostic push
227 #pragma clang diagnostic ignored "-Wnull-dereference"
228 #endif
229 static __inline __pure2 struct thread *
__curthread(void)230 __curthread(void)
231 {
232 struct thread *td;
233
234 __asm("movq %%gs:%P1,%0" : "=r" (td) : "n" (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 32
243 static __inline __pure2 struct pcb *
__curpcb(void)244 __curpcb(void)
245 {
246 struct pcb *pcb;
247
248 __asm("movq %%gs:%P1,%0" : "=r" (pcb) : "n" (OFFSETOF_CURPCB));
249 return (pcb);
250 }
251 #define curpcb (__curpcb())
252
253 #define IS_BSP() (PCPU_GET(cpuid) == 0)
254
255 #else /* !__GNUCLIKE_ASM || !__GNUCLIKE___TYPEOF */
256
257 #error "this file needs to be ported to your compiler"
258
259 #endif /* __GNUCLIKE_ASM && __GNUCLIKE___TYPEOF */
260
261 #endif /* _KERNEL */
262
263 #endif /* !_MACHINE_PCPU_H_ */
264