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 #include <machine/segments.h>
35 #include <machine/tss.h>
36
37 #include <sys/_lock.h>
38 #include <sys/_mutex.h>
39
40 struct monitorbuf {
41 int idle_state; /* Used by cpu_idle_mwait. */
42 int stop_state; /* Used by cpustop_handler. */
43 char padding[128 - (2 * sizeof(int))];
44 };
45 _Static_assert(sizeof(struct monitorbuf) == 128, "2x cache line");
46
47 /*
48 * The SMP parts are setup in pmap.c and machdep.c for the BSP, and
49 * pmap.c and mp_machdep.c sets up the data for the AP's to "see" when
50 * they awake. The reason for doing it via a struct is so that an
51 * array of pointers to each CPU's data can be set up for things like
52 * "check curproc on all other processors"
53 */
54
55 #define PCPU_MD_FIELDS \
56 struct monitorbuf pc_monitorbuf __aligned(128); /* cache line */\
57 struct pcpu *pc_prvspace; /* Self-reference */ \
58 struct pmap *pc_curpmap; \
59 struct segment_descriptor pc_common_tssd; \
60 struct segment_descriptor *pc_tss_gdt; \
61 struct segment_descriptor *pc_fsgs_gdt; \
62 struct i386tss *pc_common_tssp; \
63 u_int pc_kesp0; \
64 u_int pc_trampstk; \
65 int pc_currentldt; \
66 u_int pc_acpi_id; /* ACPI CPU id */ \
67 u_int pc_apic_id; \
68 int pc_private_tss; /* Flag indicating private tss*/\
69 u_int pc_cmci_mask; /* MCx banks for CMCI */ \
70 u_int pc_vcpu_id; /* Xen vCPU ID */ \
71 struct mtx pc_cmap_lock; \
72 void *pc_cmap_pte1; \
73 void *pc_cmap_pte2; \
74 caddr_t pc_cmap_addr1; \
75 caddr_t pc_cmap_addr2; \
76 vm_offset_t pc_qmap_addr; /* KVA for temporary mappings */\
77 vm_offset_t pc_copyout_maddr; \
78 vm_offset_t pc_copyout_saddr; \
79 struct mtx pc_copyout_mlock; \
80 struct sx pc_copyout_slock; \
81 char *pc_copyout_buf; \
82 vm_offset_t pc_pmap_eh_va; \
83 caddr_t pc_pmap_eh_ptep; \
84 uint32_t pc_smp_tlb_done; /* TLB op acknowledgement */ \
85 uint32_t pc_ibpb_set; \
86 void *pc_mds_buf; \
87 void *pc_mds_buf64; \
88 uint32_t pc_pad[4]; \
89 uint8_t pc_mds_tmp[64]; \
90 u_int pc_ipi_bitmap; \
91 char __pad[3518]
92
93 #ifdef _KERNEL
94
95 #define MONITOR_STOPSTATE_RUNNING 0
96 #define MONITOR_STOPSTATE_STOPPED 1
97
98 /*
99 * Evaluates to the byte offset of the per-cpu variable name.
100 */
101 #define __pcpu_offset(name) \
102 __offsetof(struct pcpu, name)
103
104 /*
105 * Evaluates to the type of the per-cpu variable name.
106 */
107 #define __pcpu_type(name) \
108 __typeof(((struct pcpu *)0)->name)
109
110 /*
111 * Evaluates to the address of the per-cpu variable name.
112 */
113 #define __PCPU_PTR(name) __extension__ ({ \
114 __pcpu_type(name) *__p; \
115 \
116 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \
117 : "=r" (__p) \
118 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \
119 "i" (__pcpu_offset(name))); \
120 \
121 __p; \
122 })
123
124 /*
125 * Evaluates to the value of the per-cpu variable name.
126 */
127 #define __PCPU_GET(name) __extension__ ({ \
128 __pcpu_type(name) __res; \
129 struct __s { \
130 u_char __b[MIN(sizeof(__res), 4)]; \
131 } __s; \
132 \
133 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \
134 sizeof(__res) == 4) { \
135 __asm __volatile("mov %%fs:%1,%0" \
136 : "=r" (__s) \
137 : "m" (*(struct __s *)(__pcpu_offset(name)))); \
138 *(struct __s *)(void *)&__res = __s; \
139 } else { \
140 __res = *__PCPU_PTR(name); \
141 } \
142 __res; \
143 })
144
145 /*
146 * Adds a value of the per-cpu counter name. The implementation
147 * must be atomic with respect to interrupts.
148 */
149 #define __PCPU_ADD(name, val) do { \
150 __pcpu_type(name) __val; \
151 struct __s { \
152 u_char __b[MIN(sizeof(__val), 4)]; \
153 } __s; \
154 \
155 __val = (val); \
156 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
157 sizeof(__val) == 4) { \
158 __s = *(struct __s *)(void *)&__val; \
159 __asm __volatile("add %1,%%fs:%0" \
160 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
161 : "r" (__s)); \
162 } else \
163 *__PCPU_PTR(name) += __val; \
164 } while (0)
165
166 /*
167 * Sets the value of the per-cpu variable name to value val.
168 */
169 #define __PCPU_SET(name, val) do { \
170 __pcpu_type(name) __val; \
171 struct __s { \
172 u_char __b[MIN(sizeof(__val), 4)]; \
173 } __s; \
174 \
175 __val = (val); \
176 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
177 sizeof(__val) == 4) { \
178 __s = *(struct __s *)(void *)&__val; \
179 __asm __volatile("mov %1,%%fs:%0" \
180 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
181 : "r" (__s)); \
182 } else { \
183 *__PCPU_PTR(name) = __val; \
184 } \
185 } while (0)
186
187 #define get_pcpu() __extension__ ({ \
188 struct pcpu *__pc; \
189 \
190 __asm __volatile("movl %%fs:%1,%0" \
191 : "=r" (__pc) \
192 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace)))); \
193 __pc; \
194 })
195
196 #define PCPU_GET(member) __PCPU_GET(pc_ ## member)
197 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val)
198 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member)
199 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val)
200
201 #define IS_BSP() (PCPU_GET(cpuid) == 0)
202
203 #endif /* _KERNEL */
204
205 #endif /* !_MACHINE_PCPU_H_ */
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