1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) Peter Wemm
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 #include <machine/segments.h>
39 #include <machine/tss.h>
40
41 #include <sys/_lock.h>
42 #include <sys/_mutex.h>
43
44 struct monitorbuf {
45 int idle_state; /* Used by cpu_idle_mwait. */
46 int stop_state; /* Used by cpustop_handler. */
47 char padding[128 - (2 * sizeof(int))];
48 };
49 _Static_assert(sizeof(struct monitorbuf) == 128, "2x cache line");
50
51 /*
52 * The SMP parts are setup in pmap.c and machdep.c for the BSP, and
53 * pmap.c and mp_machdep.c sets up the data for the AP's to "see" when
54 * they awake. The reason for doing it via a struct is so that an
55 * array of pointers to each CPU's data can be set up for things like
56 * "check curproc on all other processors"
57 */
58
59 #define PCPU_MD_FIELDS \
60 struct monitorbuf pc_monitorbuf __aligned(128); /* cache line */\
61 struct pcpu *pc_prvspace; /* Self-reference */ \
62 struct pmap *pc_curpmap; \
63 struct segment_descriptor pc_common_tssd; \
64 struct segment_descriptor *pc_tss_gdt; \
65 struct segment_descriptor *pc_fsgs_gdt; \
66 struct i386tss *pc_common_tssp; \
67 u_int pc_kesp0; \
68 u_int pc_trampstk; \
69 int pc_currentldt; \
70 u_int pc_acpi_id; /* ACPI CPU id */ \
71 u_int pc_apic_id; \
72 int pc_private_tss; /* Flag indicating private tss*/\
73 u_int pc_cmci_mask; /* MCx banks for CMCI */ \
74 u_int pc_vcpu_id; /* Xen vCPU ID */ \
75 struct mtx pc_cmap_lock; \
76 void *pc_cmap_pte1; \
77 void *pc_cmap_pte2; \
78 caddr_t pc_cmap_addr1; \
79 caddr_t pc_cmap_addr2; \
80 vm_offset_t pc_qmap_addr; /* KVA for temporary mappings */\
81 vm_offset_t pc_copyout_maddr; \
82 vm_offset_t pc_copyout_saddr; \
83 struct mtx pc_copyout_mlock; \
84 struct sx pc_copyout_slock; \
85 char *pc_copyout_buf; \
86 vm_offset_t pc_pmap_eh_va; \
87 caddr_t pc_pmap_eh_ptep; \
88 uint32_t pc_smp_tlb_done; /* TLB op acknowledgement */ \
89 uint32_t pc_ibpb_set; \
90 void *pc_mds_buf; \
91 void *pc_mds_buf64; \
92 uint32_t pc_pad[4]; \
93 uint8_t pc_mds_tmp[64]; \
94 u_int pc_ipi_bitmap; \
95 char __pad[3518]
96
97 #ifdef _KERNEL
98
99 #define MONITOR_STOPSTATE_RUNNING 0
100 #define MONITOR_STOPSTATE_STOPPED 1
101
102 #if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
103
104 /*
105 * Evaluates to the byte offset of the per-cpu variable name.
106 */
107 #define __pcpu_offset(name) \
108 __offsetof(struct pcpu, name)
109
110 /*
111 * Evaluates to the type of the per-cpu variable name.
112 */
113 #define __pcpu_type(name) \
114 __typeof(((struct pcpu *)0)->name)
115
116 /*
117 * Evaluates to the address of the per-cpu variable name.
118 */
119 #define __PCPU_PTR(name) __extension__ ({ \
120 __pcpu_type(name) *__p; \
121 \
122 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \
123 : "=r" (__p) \
124 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \
125 "i" (__pcpu_offset(name))); \
126 \
127 __p; \
128 })
129
130 /*
131 * Evaluates to the value of the per-cpu variable name.
132 */
133 #define __PCPU_GET(name) __extension__ ({ \
134 __pcpu_type(name) __res; \
135 struct __s { \
136 u_char __b[MIN(sizeof(__res), 4)]; \
137 } __s; \
138 \
139 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \
140 sizeof(__res) == 4) { \
141 __asm __volatile("mov %%fs:%1,%0" \
142 : "=r" (__s) \
143 : "m" (*(struct __s *)(__pcpu_offset(name)))); \
144 *(struct __s *)(void *)&__res = __s; \
145 } else { \
146 __res = *__PCPU_PTR(name); \
147 } \
148 __res; \
149 })
150
151 /*
152 * Adds a value of the per-cpu counter name. The implementation
153 * must be atomic with respect to interrupts.
154 */
155 #define __PCPU_ADD(name, val) do { \
156 __pcpu_type(name) __val; \
157 struct __s { \
158 u_char __b[MIN(sizeof(__val), 4)]; \
159 } __s; \
160 \
161 __val = (val); \
162 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
163 sizeof(__val) == 4) { \
164 __s = *(struct __s *)(void *)&__val; \
165 __asm __volatile("add %1,%%fs:%0" \
166 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
167 : "r" (__s)); \
168 } else \
169 *__PCPU_PTR(name) += __val; \
170 } while (0)
171
172 /*
173 * Increments the value of the per-cpu counter name. The implementation
174 * must be atomic with respect to interrupts.
175 */
176 #define __PCPU_INC(name) do { \
177 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \
178 sizeof(__pcpu_type(name)) == 2 || \
179 sizeof(__pcpu_type(name)) == 4); \
180 if (sizeof(__pcpu_type(name)) == 1) { \
181 __asm __volatile("incb %%fs:%0" \
182 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
183 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
184 } else if (sizeof(__pcpu_type(name)) == 2) { \
185 __asm __volatile("incw %%fs:%0" \
186 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
187 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
188 } else if (sizeof(__pcpu_type(name)) == 4) { \
189 __asm __volatile("incl %%fs:%0" \
190 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
191 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
192 } \
193 } while (0)
194
195 /*
196 * Sets the value of the per-cpu variable name to value val.
197 */
198 #define __PCPU_SET(name, val) do { \
199 __pcpu_type(name) __val; \
200 struct __s { \
201 u_char __b[MIN(sizeof(__val), 4)]; \
202 } __s; \
203 \
204 __val = (val); \
205 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
206 sizeof(__val) == 4) { \
207 __s = *(struct __s *)(void *)&__val; \
208 __asm __volatile("mov %1,%%fs:%0" \
209 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
210 : "r" (__s)); \
211 } else { \
212 *__PCPU_PTR(name) = __val; \
213 } \
214 } while (0)
215
216 #define get_pcpu() __extension__ ({ \
217 struct pcpu *__pc; \
218 \
219 __asm __volatile("movl %%fs:%1,%0" \
220 : "=r" (__pc) \
221 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace)))); \
222 __pc; \
223 })
224
225 #define PCPU_GET(member) __PCPU_GET(pc_ ## member)
226 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val)
227 #define PCPU_INC(member) __PCPU_INC(pc_ ## member)
228 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member)
229 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val)
230
231 #define IS_BSP() (PCPU_GET(cpuid) == 0)
232
233 #else /* defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
234
235 #error "this file needs to be ported to your compiler"
236
237 #endif /* __GNUCLIKE_ASM etc. */
238
239 #endif /* _KERNEL */
240
241 #endif /* !_MACHINE_PCPU_H_ */
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