Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/amd64/include/pcpu.h
Version:
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1 /*- 2 * Copyright (c) Peter Wemm <peter@netplex.com.au> 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 /* 37 * The SMP parts are setup in pmap.c and locore.s for the BSP, and 38 * mp_machdep.c sets up the data for the AP's to "see" when they awake. 39 * The reason for doing it via a struct is so that an array of pointers 40 * to each CPU's data can be set up for things like "check curproc on all 41 * other processors" 42 */ 43 #define PCPU_MD_FIELDS \ 44 struct pcpu *pc_prvspace; /* Self-reference */ \ 45 struct pmap *pc_curpmap; \ 46 struct amd64tss *pc_tssp; \ 47 register_t pc_rsp0; \ 48 register_t pc_scratch_rsp; /* User %rsp in syscall */ \ 49 u_int pc_apic_id; \ 50 u_int pc_acpi_id; /* ACPI CPU id */ \ 51 struct user_segment_descriptor *pc_gs32p 52 53 #ifdef _KERNEL 54 55 #ifdef lint 56 57 extern struct pcpu *pcpup; 58 59 #define PCPU_GET(member) (pcpup->pc_ ## member) 60 #define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val)) 61 #define PCPU_INC(member) PCPU_ADD(member, 1) 62 #define PCPU_PTR(member) (&pcpup->pc_ ## member) 63 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 64 65 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 66 67 /* 68 * Evaluates to the byte offset of the per-cpu variable name. 69 */ 70 #define __pcpu_offset(name) \ 71 __offsetof(struct pcpu, name) 72 73 /* 74 * Evaluates to the type of the per-cpu variable name. 75 */ 76 #define __pcpu_type(name) \ 77 __typeof(((struct pcpu *)0)->name) 78 79 /* 80 * Evaluates to the address of the per-cpu variable name. 81 */ 82 #define __PCPU_PTR(name) __extension__ ({ \ 83 __pcpu_type(name) *__p; \ 84 \ 85 __asm __volatile("movq %%gs:%1,%0; addq %2,%0" \ 86 : "=r" (__p) \ 87 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 88 "i" (__pcpu_offset(name))); \ 89 \ 90 __p; \ 91 }) 92 93 /* 94 * Evaluates to the value of the per-cpu variable name. 95 */ 96 #define __PCPU_GET(name) __extension__ ({ \ 97 __pcpu_type(name) __res; \ 98 struct __s { \ 99 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 100 } __s; \ 101 \ 102 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 103 sizeof(__res) == 4 || sizeof(__res) == 8) { \ 104 __asm __volatile("mov %%gs:%1,%0" \ 105 : "=r" (__s) \ 106 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 107 *(struct __s *)(void *)&__res = __s; \ 108 } else { \ 109 __res = *__PCPU_PTR(name); \ 110 } \ 111 __res; \ 112 }) 113 114 /* 115 * Adds the value to the per-cpu counter name. The implementation 116 * must be atomic with respect to interrupts. 117 */ 118 #define __PCPU_ADD(name, val) do { \ 119 __pcpu_type(name) __val; \ 120 struct __s { \ 121 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 122 } __s; \ 123 \ 124 __val = (val); \ 125 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 126 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 127 __s = *(struct __s *)(void *)&__val; \ 128 __asm __volatile("add %1,%%gs:%0" \ 129 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 130 : "r" (__s)); \ 131 } else \ 132 *__PCPU_PTR(name) += __val; \ 133 } while (0) 134 135 /* 136 * Increments the value of the per-cpu counter name. The implementation 137 * must be atomic with respect to interrupts. 138 */ 139 #define __PCPU_INC(name) do { \ 140 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 141 sizeof(__pcpu_type(name)) == 2 || \ 142 sizeof(__pcpu_type(name)) == 4 || \ 143 sizeof(__pcpu_type(name)) == 8); \ 144 if (sizeof(__pcpu_type(name)) == 1) { \ 145 __asm __volatile("incb %%gs:%0" \ 146 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 147 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 148 } else if (sizeof(__pcpu_type(name)) == 2) { \ 149 __asm __volatile("incw %%gs:%0" \ 150 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 151 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 152 } else if (sizeof(__pcpu_type(name)) == 4) { \ 153 __asm __volatile("incl %%gs:%0" \ 154 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 155 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 156 } else if (sizeof(__pcpu_type(name)) == 8) { \ 157 __asm __volatile("incq %%gs:%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)), 8)]; \ 170 } __s; \ 171 \ 172 __val = (val); \ 173 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 174 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 175 __s = *(struct __s *)(void *)&__val; \ 176 __asm __volatile("mov %1,%%gs:%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("movq %%gs: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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