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 locore.s for the BSP, and
46 * mp_machdep.c sets up the data for the AP's to "see" when they awake.
47 * The reason for doing it via a struct is so that an array of pointers
48 * to each CPU's data can be set up for things like "check curproc on all
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 i386tss pc_common_tss; \
57 struct segment_descriptor pc_common_tssd; \
58 struct segment_descriptor *pc_tss_gdt; \
59 struct segment_descriptor *pc_fsgs_gdt; \
61 u_int pc_acpi_id; /* ACPI CPU id */ \
63 int pc_private_tss; /* Flag indicating private tss*/\
64 u_int pc_cmci_mask; /* MCx banks for CMCI */ \
65 u_int pc_vcpu_id; /* Xen vCPU ID */ \
66 struct mtx pc_cmap_lock; \
69 caddr_t pc_cmap_addr1; \
70 caddr_t pc_cmap_addr2; \
71 vm_offset_t pc_qmap_addr; /* KVA for temporary mappings */\
72 uint32_t pc_smp_tlb_done; /* TLB op acknowledgement */ \
77 #if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF)
80 * Evaluates to the byte offset of the per-cpu variable name.
82 #define __pcpu_offset(name) \
83 __offsetof(struct pcpu, name)
86 * Evaluates to the type of the per-cpu variable name.
88 #define __pcpu_type(name) \
89 __typeof(((struct pcpu *)0)->name)
92 * Evaluates to the address of the per-cpu variable name.
94 #define __PCPU_PTR(name) __extension__ ({ \
95 __pcpu_type(name) *__p; \
97 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \
99 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \
100 "i" (__pcpu_offset(name))); \
106 * Evaluates to the value of the per-cpu variable name.
108 #define __PCPU_GET(name) __extension__ ({ \
109 __pcpu_type(name) __res; \
111 u_char __b[MIN(sizeof(__res), 4)]; \
114 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \
115 sizeof(__res) == 4) { \
116 __asm __volatile("mov %%fs:%1,%0" \
118 : "m" (*(struct __s *)(__pcpu_offset(name)))); \
119 *(struct __s *)(void *)&__res = __s; \
121 __res = *__PCPU_PTR(name); \
127 * Adds a value of the per-cpu counter name. The implementation
128 * must be atomic with respect to interrupts.
130 #define __PCPU_ADD(name, val) do { \
131 __pcpu_type(name) __val; \
133 u_char __b[MIN(sizeof(__val), 4)]; \
137 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
138 sizeof(__val) == 4) { \
139 __s = *(struct __s *)(void *)&__val; \
140 __asm __volatile("add %1,%%fs:%0" \
141 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
144 *__PCPU_PTR(name) += __val; \
148 * Increments the value of the per-cpu counter name. The implementation
149 * must be atomic with respect to interrupts.
151 #define __PCPU_INC(name) do { \
152 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \
153 sizeof(__pcpu_type(name)) == 2 || \
154 sizeof(__pcpu_type(name)) == 4); \
155 if (sizeof(__pcpu_type(name)) == 1) { \
156 __asm __volatile("incb %%fs:%0" \
157 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
158 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
159 } else if (sizeof(__pcpu_type(name)) == 2) { \
160 __asm __volatile("incw %%fs:%0" \
161 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
162 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
163 } else if (sizeof(__pcpu_type(name)) == 4) { \
164 __asm __volatile("incl %%fs:%0" \
165 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\
166 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\
171 * Sets the value of the per-cpu variable name to value val.
173 #define __PCPU_SET(name, val) do { \
174 __pcpu_type(name) __val; \
176 u_char __b[MIN(sizeof(__val), 4)]; \
180 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \
181 sizeof(__val) == 4) { \
182 __s = *(struct __s *)(void *)&__val; \
183 __asm __volatile("mov %1,%%fs:%0" \
184 : "=m" (*(struct __s *)(__pcpu_offset(name))) \
187 *__PCPU_PTR(name) = __val; \
191 #define get_pcpu() __extension__ ({ \
194 __asm __volatile("movl %%fs:%1,%0" \
196 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace)))); \
200 #define PCPU_GET(member) __PCPU_GET(pc_ ## member)
201 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val)
202 #define PCPU_INC(member) __PCPU_INC(pc_ ## member)
203 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member)
204 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val)
206 #define OFFSETOF_CURTHREAD 0
208 #pragma clang diagnostic push
209 #pragma clang diagnostic ignored "-Wnull-dereference"
211 static __inline __pure2 struct thread *
216 __asm("movl %%fs:%1,%0" : "=r" (td)
217 : "m" (*(char *)OFFSETOF_CURTHREAD));
221 #pragma clang diagnostic pop
223 #define curthread (__curthread())
225 #define OFFSETOF_CURPCB 16
226 static __inline __pure2 struct pcb *
231 __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB));
234 #define curpcb (__curpcb())
236 #else /* defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */
238 #error "this file needs to be ported to your compiler"
240 #endif /* __GNUCLIKE_ASM etc. */
244 #endif /* !_MACHINE_PCPU_H_ */