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
Version:
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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 * $FreeBSD$ 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 #ifdef _KERNEL 37 38 #include <machine/segments.h> 39 #include <machine/tss.h> 40 41 /* 42 * The SMP parts are setup in pmap.c and locore.s for the BSP, and 43 * mp_machdep.c sets up the data for the AP's to "see" when they awake. 44 * The reason for doing it via a struct is so that an array of pointers 45 * to each CPU's data can be set up for things like "check curproc on all 46 * other processors" 47 */ 48 #define PCPU_MD_FIELDS \ 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 60 #ifdef lint 61 62 extern struct pcpu *pcpup; 63 64 #define PCPU_GET(member) (pcpup->pc_ ## member) 65 #define PCPU_ADD(member, val) (pcpu->pc_ ## member += (val)) 66 #define PCPU_INC(member) PCPU_ADD(member, 1) 67 #define PCPU_PTR(member) (&pcpup->pc_ ## member) 68 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 69 70 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 71 72 /* 73 * Evaluates to the byte offset of the per-cpu variable name. 74 */ 75 #define __pcpu_offset(name) \ 76 __offsetof(struct pcpu, name) 77 78 /* 79 * Evaluates to the type of the per-cpu variable name. 80 */ 81 #define __pcpu_type(name) \ 82 __typeof(((struct pcpu *)0)->name) 83 84 /* 85 * Evaluates to the address of the per-cpu variable name. 86 */ 87 #define __PCPU_PTR(name) __extension__ ({ \ 88 __pcpu_type(name) *__p; \ 89 \ 90 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \ 91 : "=r" (__p) \ 92 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 93 "i" (__pcpu_offset(name))); \ 94 \ 95 __p; \ 96 }) 97 98 /* 99 * Evaluates to the value of the per-cpu variable name. 100 */ 101 #define __PCPU_GET(name) __extension__ ({ \ 102 __pcpu_type(name) __res; \ 103 struct __s { \ 104 u_char __b[MIN(sizeof(__pcpu_type(name)), 4)]; \ 105 } __s; \ 106 \ 107 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 108 sizeof(__res) == 4) { \ 109 __asm __volatile("mov %%fs:%1,%0" \ 110 : "=r" (__s) \ 111 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 112 *(struct __s *)(void *)&__res = __s; \ 113 } else { \ 114 __res = *__PCPU_PTR(name); \ 115 } \ 116 __res; \ 117 }) 118 119 /* 120 * Adds a value of the per-cpu counter name. The implementation 121 * must be atomic with respect to interrupts. 122 */ 123 #define __PCPU_ADD(name, val) do { \ 124 __pcpu_type(name) __val; \ 125 struct __s { \ 126 u_char __b[MIN(sizeof(__pcpu_type(name)), 4)]; \ 127 } __s; \ 128 \ 129 __val = (val); \ 130 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 131 sizeof(__val) == 4) { \ 132 __s = *(struct __s *)(void *)&__val; \ 133 __asm __volatile("add %1,%%fs:%0" \ 134 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 135 : "r" (__s)); \ 136 } else \ 137 *__PCPU_PTR(name) += __val; \ 138 } while (0) 139 140 /* 141 * Increments the value of the per-cpu counter name. The implementation 142 * must be atomic with respect to interrupts. 143 */ 144 #define __PCPU_INC(name) do { \ 145 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 146 sizeof(__pcpu_type(name)) == 2 || \ 147 sizeof(__pcpu_type(name)) == 4); \ 148 if (sizeof(__pcpu_type(name)) == 1) { \ 149 __asm __volatile("incb %%fs:%0" \ 150 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 151 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 152 } else if (sizeof(__pcpu_type(name)) == 2) { \ 153 __asm __volatile("incw %%fs:%0" \ 154 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 155 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 156 } else if (sizeof(__pcpu_type(name)) == 4) { \ 157 __asm __volatile("incl %%fs:%0" \ 158 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 159 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 160 } \ 161 } while (0) 162 163 /* 164 * Sets the value of the per-cpu variable name to value val. 165 */ 166 #define __PCPU_SET(name, val) { \ 167 __pcpu_type(name) __val; \ 168 struct __s { \ 169 u_char __b[MIN(sizeof(__pcpu_type(name)), 4)]; \ 170 } __s; \ 171 \ 172 __val = (val); \ 173 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 174 sizeof(__val) == 4) { \ 175 __s = *(struct __s *)(void *)&__val; \ 176 __asm __volatile("mov %1,%%fs:%0" \ 177 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 178 : "r" (__s)); \ 179 } else { \ 180 *__PCPU_PTR(name) = __val; \ 181 } \ 182 } 183 184 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 185 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 186 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 187 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 188 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 189 190 static __inline struct thread * 191 __curthread(void) 192 { 193 struct thread *td; 194 195 __asm __volatile("movl %%fs:0,%0" : "=r" (td)); 196 return (td); 197 } 198 #define curthread (__curthread()) 199 200 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 201 202 #error "this file needs to be ported to your compiler" 203 204 #endif /* lint, etc. */ 205 206 #endif /* _KERNEL */ 207 208 #endif /* !_MACHINE_PCPU_H_ */
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