Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/pcpu.h
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1 /*- 2 * Copyright (c) Peter Wemm 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: releng/11.0/sys/i386/include/pcpu.h 286296 2015-08-04 19:46:13Z jah $ 27 */ 28 29 #ifndef _MACHINE_PCPU_H_ 30 #define _MACHINE_PCPU_H_ 31 32 #ifndef _SYS_CDEFS_H_ 33 #error "sys/cdefs.h is a prerequisite for this file" 34 #endif 35 36 #include <machine/segments.h> 37 #include <machine/tss.h> 38 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 47 #define PCPU_MD_FIELDS \ 48 char pc_monitorbuf[128] __aligned(128); /* cache line */ \ 49 struct pcpu *pc_prvspace; /* Self-reference */ \ 50 struct pmap *pc_curpmap; \ 51 struct i386tss pc_common_tss; \ 52 struct segment_descriptor pc_common_tssd; \ 53 struct segment_descriptor *pc_tss_gdt; \ 54 struct segment_descriptor *pc_fsgs_gdt; \ 55 int pc_currentldt; \ 56 u_int pc_acpi_id; /* ACPI CPU id */ \ 57 u_int pc_apic_id; \ 58 int pc_private_tss; /* Flag indicating private tss*/\ 59 u_int pc_cmci_mask; /* MCx banks for CMCI */ \ 60 u_int pc_vcpu_id; /* Xen vCPU ID */ \ 61 vm_offset_t pc_qmap_addr; /* KVA for temporary mappings */\ 62 char __pad[229] 63 64 #ifdef _KERNEL 65 66 #ifdef lint 67 68 extern struct pcpu *pcpup; 69 70 #define PCPU_GET(member) (pcpup->pc_ ## member) 71 #define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val)) 72 #define PCPU_INC(member) PCPU_ADD(member, 1) 73 #define PCPU_PTR(member) (&pcpup->pc_ ## member) 74 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 75 76 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 77 78 /* 79 * Evaluates to the byte offset of the per-cpu variable name. 80 */ 81 #define __pcpu_offset(name) \ 82 __offsetof(struct pcpu, name) 83 84 /* 85 * Evaluates to the type of the per-cpu variable name. 86 */ 87 #define __pcpu_type(name) \ 88 __typeof(((struct pcpu *)0)->name) 89 90 /* 91 * Evaluates to the address of the per-cpu variable name. 92 */ 93 #define __PCPU_PTR(name) __extension__ ({ \ 94 __pcpu_type(name) *__p; \ 95 \ 96 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \ 97 : "=r" (__p) \ 98 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 99 "i" (__pcpu_offset(name))); \ 100 \ 101 __p; \ 102 }) 103 104 /* 105 * Evaluates to the value of the per-cpu variable name. 106 */ 107 #define __PCPU_GET(name) __extension__ ({ \ 108 __pcpu_type(name) __res; \ 109 struct __s { \ 110 u_char __b[MIN(sizeof(__res), 4)]; \ 111 } __s; \ 112 \ 113 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 114 sizeof(__res) == 4) { \ 115 __asm __volatile("mov %%fs:%1,%0" \ 116 : "=r" (__s) \ 117 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 118 *(struct __s *)(void *)&__res = __s; \ 119 } else { \ 120 __res = *__PCPU_PTR(name); \ 121 } \ 122 __res; \ 123 }) 124 125 /* 126 * Adds a value of the per-cpu counter name. The implementation 127 * must be atomic with respect to interrupts. 128 */ 129 #define __PCPU_ADD(name, val) do { \ 130 __pcpu_type(name) __val; \ 131 struct __s { \ 132 u_char __b[MIN(sizeof(__val), 4)]; \ 133 } __s; \ 134 \ 135 __val = (val); \ 136 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 137 sizeof(__val) == 4) { \ 138 __s = *(struct __s *)(void *)&__val; \ 139 __asm __volatile("add %1,%%fs:%0" \ 140 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 141 : "r" (__s)); \ 142 } else \ 143 *__PCPU_PTR(name) += __val; \ 144 } while (0) 145 146 /* 147 * Increments the value of the per-cpu counter name. The implementation 148 * must be atomic with respect to interrupts. 149 */ 150 #define __PCPU_INC(name) do { \ 151 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 152 sizeof(__pcpu_type(name)) == 2 || \ 153 sizeof(__pcpu_type(name)) == 4); \ 154 if (sizeof(__pcpu_type(name)) == 1) { \ 155 __asm __volatile("incb %%fs:%0" \ 156 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 157 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 158 } else if (sizeof(__pcpu_type(name)) == 2) { \ 159 __asm __volatile("incw %%fs:%0" \ 160 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 161 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 162 } else if (sizeof(__pcpu_type(name)) == 4) { \ 163 __asm __volatile("incl %%fs:%0" \ 164 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 165 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 166 } \ 167 } while (0) 168 169 /* 170 * Sets the value of the per-cpu variable name to value val. 171 */ 172 #define __PCPU_SET(name, val) do { \ 173 __pcpu_type(name) __val; \ 174 struct __s { \ 175 u_char __b[MIN(sizeof(__val), 4)]; \ 176 } __s; \ 177 \ 178 __val = (val); \ 179 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 180 sizeof(__val) == 4) { \ 181 __s = *(struct __s *)(void *)&__val; \ 182 __asm __volatile("mov %1,%%fs:%0" \ 183 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 184 : "r" (__s)); \ 185 } else { \ 186 *__PCPU_PTR(name) = __val; \ 187 } \ 188 } while (0) 189 190 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 191 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 192 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 193 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 194 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 195 196 #define OFFSETOF_CURTHREAD 0 197 #ifdef __clang__ 198 #pragma clang diagnostic push 199 #pragma clang diagnostic ignored "-Wnull-dereference" 200 #endif 201 static __inline __pure2 struct thread * 202 __curthread(void) 203 { 204 struct thread *td; 205 206 __asm("movl %%fs:%1,%0" : "=r" (td) 207 : "m" (*(char *)OFFSETOF_CURTHREAD)); 208 return (td); 209 } 210 #ifdef __clang__ 211 #pragma clang diagnostic pop 212 #endif 213 #define curthread (__curthread()) 214 215 #define OFFSETOF_CURPCB 16 216 static __inline __pure2 struct pcb * 217 __curpcb(void) 218 { 219 struct pcb *pcb; 220 221 __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 222 return (pcb); 223 } 224 #define curpcb (__curpcb()) 225 226 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 227 228 #error "this file needs to be ported to your compiler" 229 230 #endif /* lint, etc. */ 231 232 #endif /* _KERNEL */ 233 234 #endif /* !_MACHINE_PCPU_H_ */
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