2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) Peter Wemm
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
31 #ifndef _MACHINE_PCPU_H_
32 #define _MACHINE_PCPU_H_
35 #error "sys/cdefs.h is a prerequisite for this file"
38 #include <machine/segments.h>
39 #include <machine/tss.h>
41 #include <sys/_lock.h>
42 #include <sys/_mutex.h>
45 * The SMP parts are setup in pmap.c and machdep.c for the BSP, and
46 * pmap.c and mp_machdep.c sets up the data for the AP's to "see" when
47 * they awake. The reason for doing it via a struct is so that an
48 * array of pointers to each CPU's data can be set up for things like
49 * "check curproc on all other processors"
52 #define PCPU_MD_FIELDS \
53 char pc_monitorbuf[128] __aligned(128); /* cache line */ \
54 struct pcpu *pc_prvspace; /* Self-reference */ \
55 struct pmap *pc_curpmap; \
56 struct segment_descriptor pc_common_tssd; \
57 struct segment_descriptor *pc_tss_gdt; \
58 struct segment_descriptor *pc_fsgs_gdt; \
59 struct i386tss *pc_common_tssp; \
63 u_int pc_acpi_id; /* ACPI CPU id */ \
65 int pc_private_tss; /* Flag indicating private tss*/\
66 u_int pc_cmci_mask; /* MCx banks for CMCI */ \
67 u_int pc_vcpu_id; /* Xen vCPU ID */ \
68 struct mtx pc_cmap_lock; \
71 caddr_t pc_cmap_addr1; \
72 caddr_t pc_cmap_addr2; \
73 vm_offset_t pc_qmap_addr; /* KVA for temporary mappings */\
74 vm_offset_t pc_copyout_maddr; \
75 vm_offset_t pc_copyout_saddr; \
76 struct mtx pc_copyout_mlock; \
77 struct sx pc_copyout_slock; \
78 char *pc_copyout_buf; \
79 uint32_t pc_smp_tlb_done; /* TLB op acknowledgement */ \
84 #if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
87 * Evaluates to the byte offset of the per-cpu variable name.
89 #define __pcpu_offset(name) \
90 __offsetof(struct pcpu, name)
93 * Evaluates to the type of the per-cpu variable name.
95 #define __pcpu_type(name) \
96 __typeof(((struct pcpu *)0)->name)
99 * Evaluates to the address of the per-cpu variable name.
101 #define __PCPU_PTR(name) __extension__ ({ \
102 __pcpu_type(name) *__p; \
104 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \
106 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \
107 "i" (__pcpu_offset(name))); \
113 * Evaluates to the value of the per-cpu variable name.
115 #define __PCPU_GET(name) __extension__ ({ \
116 __pcpu_type(name) __res; \
118 u_char __b[MIN(sizeof(__res), 4)]; \
121 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \
122 sizeof(__res) == 4) { \
123 __asm __volatile("mov %%fs:%1,%0" \
125 : "m" (*(struct __s *)(__pcpu_offset(name)))); \
126 *(struct __s *)(void *)&__res = __s; \
128 __res = *__PCPU_PTR(name); \
134 * Adds a value of the per-cpu counter name. The implementation
135 * must be atomic with respect to interrupts.
137 #define __PCPU_ADD(name, val) do { \
138 __pcpu_type(name) __val; \
140 u_char __b[MIN(sizeof(__val), 4)]; \
144 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
145 sizeof(__val) == 4) { \
146 __s = *(struct __s *)(void *)&__val; \
147 __asm __volatile("add %1,%%fs:%0" \
148 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
151 *__PCPU_PTR(name) += __val; \
155 * Increments the value of the per-cpu counter name. The implementation
156 * must be atomic with respect to interrupts.
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 if (sizeof(__pcpu_type(name)) == 1) { \
163 __asm __volatile("incb %%fs:%0" \
164 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
165 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
166 } else if (sizeof(__pcpu_type(name)) == 2) { \
167 __asm __volatile("incw %%fs:%0" \
168 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
169 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
170 } else if (sizeof(__pcpu_type(name)) == 4) { \
171 __asm __volatile("incl %%fs:%0" \
172 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
173 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
178 * Sets the value of the per-cpu variable name to value val.
180 #define __PCPU_SET(name, val) do { \
181 __pcpu_type(name) __val; \
183 u_char __b[MIN(sizeof(__val), 4)]; \
187 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
188 sizeof(__val) == 4) { \
189 __s = *(struct __s *)(void *)&__val; \
190 __asm __volatile("mov %1,%%fs:%0" \
191 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
194 *__PCPU_PTR(name) = __val; \
198 #define get_pcpu() __extension__ ({ \
201 __asm __volatile("movl %%fs:%1,%0" \
203 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace)))); \
207 #define PCPU_GET(member) __PCPU_GET(pc_ ## member)
208 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val)
209 #define PCPU_INC(member) __PCPU_INC(pc_ ## member)
210 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member)
211 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val)
213 #define OFFSETOF_CURTHREAD 0
215 #pragma clang diagnostic push
216 #pragma clang diagnostic ignored "-Wnull-dereference"
218 static __inline __pure2 struct thread *
223 __asm("movl %%fs:%1,%0" : "=r" (td)
224 : "m" (*(char *)OFFSETOF_CURTHREAD));
228 #pragma clang diagnostic pop
230 #define curthread (__curthread())
232 #define OFFSETOF_CURPCB 16
233 static __inline __pure2 struct pcb *
238 __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB));
241 #define curpcb (__curpcb())
243 #define IS_BSP() (PCPU_GET(cpuid) == 0)
245 #else /* defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
247 #error "this file needs to be ported to your compiler"
249 #endif /* __GNUCLIKE_ASM etc. */
253 #endif /* !_MACHINE_PCPU_H_ */