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 <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: releng/5.4/sys/i386/include/pcpu.h 145335 2005-04-20 19:11:07Z cvs2svn $ 27 */ 28 29 #ifndef _MACHINE_PCPU_H_ 30 #define _MACHINE_PCPU_H_ 31 32 #ifdef _KERNEL 33 34 #include <machine/segments.h> 35 #include <machine/tss.h> 36 37 /* 38 * The SMP parts are setup in pmap.c and locore.s for the BSP, and 39 * mp_machdep.c sets up the data for the AP's to "see" when they awake. 40 * The reason for doing it via a struct is so that an array of pointers 41 * to each CPU's data can be set up for things like "check curproc on all 42 * other processors" 43 */ 44 #define PCPU_MD_FIELDS \ 45 struct pcpu *pc_prvspace; /* Self-reference */ \ 46 struct pmap *pc_curpmap; \ 47 struct i386tss pc_common_tss; \ 48 struct segment_descriptor pc_common_tssd; \ 49 struct segment_descriptor *pc_tss_gdt; \ 50 int pc_currentldt; \ 51 u_int pc_acpi_id; \ 52 u_int pc_apic_id 53 54 #if defined(lint) 55 56 extern struct pcpu *pcpup; 57 58 #define PCPU_GET(member) (pcpup->pc_ ## member) 59 #define PCPU_PTR(member) (&pcpup->pc_ ## member) 60 #define PCPU_SET(member,value) (pcpup->pc_ ## member = (value)) 61 62 #elif defined(__GNUC__) || defined (__INTEL_COMPILER) 63 64 /* 65 * Evaluates to the byte offset of the per-cpu variable name. 66 */ 67 #define __pcpu_offset(name) \ 68 __offsetof(struct pcpu, name) 69 70 /* 71 * Evaluates to the type of the per-cpu variable name. 72 */ 73 #define __pcpu_type(name) \ 74 __typeof(((struct pcpu *)0)->name) 75 76 /* 77 * Evaluates to the address of the per-cpu variable name. 78 */ 79 #define __PCPU_PTR(name) __extension__ ({ \ 80 __pcpu_type(name) *__p; \ 81 \ 82 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \ 83 : "=r" (__p) \ 84 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 85 "i" (__pcpu_offset(name))); \ 86 \ 87 __p; \ 88 }) 89 90 /* 91 * Evaluates to the value of the per-cpu variable name. 92 */ 93 #define __PCPU_GET(name) __extension__ ({ \ 94 __pcpu_type(name) __result; \ 95 \ 96 if (sizeof(__result) == 1) { \ 97 u_char __b; \ 98 __asm __volatile("movb %%fs:%1,%0" \ 99 : "=r" (__b) \ 100 : "m" (*(u_char *)(__pcpu_offset(name)))); \ 101 __result = *(__pcpu_type(name) *)(void *)&__b; \ 102 } else if (sizeof(__result) == 2) { \ 103 u_short __w; \ 104 __asm __volatile("movw %%fs:%1,%0" \ 105 : "=r" (__w) \ 106 : "m" (*(u_short *)(__pcpu_offset(name)))); \ 107 __result = *(__pcpu_type(name) *)(void *)&__w; \ 108 } else if (sizeof(__result) == 4) { \ 109 u_int __i; \ 110 __asm __volatile("movl %%fs:%1,%0" \ 111 : "=r" (__i) \ 112 : "m" (*(u_int *)(__pcpu_offset(name)))); \ 113 __result = *(__pcpu_type(name) *)(void *)&__i; \ 114 } else { \ 115 __result = *__PCPU_PTR(name); \ 116 } \ 117 \ 118 __result; \ 119 }) 120 121 /* 122 * Sets the value of the per-cpu variable name to value val. 123 */ 124 #define __PCPU_SET(name, val) { \ 125 __pcpu_type(name) __val = (val); \ 126 \ 127 if (sizeof(__val) == 1) { \ 128 u_char __b; \ 129 __b = *(u_char *)&__val; \ 130 __asm __volatile("movb %1,%%fs:%0" \ 131 : "=m" (*(u_char *)(__pcpu_offset(name))) \ 132 : "r" (__b)); \ 133 } else if (sizeof(__val) == 2) { \ 134 u_short __w; \ 135 __w = *(u_short *)&__val; \ 136 __asm __volatile("movw %1,%%fs:%0" \ 137 : "=m" (*(u_short *)(__pcpu_offset(name))) \ 138 : "r" (__w)); \ 139 } else if (sizeof(__val) == 4) { \ 140 u_int __i; \ 141 __i = *(u_int *)&__val; \ 142 __asm __volatile("movl %1,%%fs:%0" \ 143 : "=m" (*(u_int *)(__pcpu_offset(name))) \ 144 : "r" (__i)); \ 145 } else { \ 146 *__PCPU_PTR(name) = __val; \ 147 } \ 148 } 149 150 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 151 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 152 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 153 154 static __inline struct thread * 155 __curthread(void) 156 { 157 struct thread *td; 158 159 __asm __volatile("movl %%fs:0,%0" : "=r" (td)); 160 return (td); 161 } 162 #define curthread (__curthread()) 163 164 #else 165 #error gcc or lint is required to use this file 166 #endif 167 168 #endif /* _KERNEL */ 169 170 #endif /* ! _MACHINE_PCPU_H_ */
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