pcpu.h revision 158502
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: head/sys/i386/include/pcpu.h 158502 2006-05-12 22:41:58Z peter $ 27 */ 28 29#ifndef _MACHINE_PCPU_H_ 30#define _MACHINE_PCPU_H_ 31 32#ifndef _SYS_CDEFS_H_ 33#error this file needs sys/cdefs.h as a prerequisite 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; \ 57 u_int pc_apic_id; \ 58 int pc_private_tss /* flag indicating private tss */ 59 60#if defined(lint) 61 62extern struct pcpu *pcpup; 63 64#define PCPU_GET(member) (pcpup->pc_ ## member) 65#define PCPU_PTR(member) (&pcpup->pc_ ## member) 66#define PCPU_SET(member,value) (pcpup->pc_ ## member = (value)) 67 68#elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) \ 69 && defined(__GNUCLIKE___OFFSETOF) 70 71/* 72 * Evaluates to the byte offset of the per-cpu variable name. 73 */ 74#define __pcpu_offset(name) \ 75 __offsetof(struct pcpu, name) 76 77/* 78 * Evaluates to the type of the per-cpu variable name. 79 */ 80#define __pcpu_type(name) \ 81 __typeof(((struct pcpu *)0)->name) 82 83/* 84 * Evaluates to the address of the per-cpu variable name. 85 */ 86#define __PCPU_PTR(name) __extension__ ({ \ 87 __pcpu_type(name) *__p; \ 88 \ 89 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \ 90 : "=r" (__p) \ 91 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 92 "i" (__pcpu_offset(name))); \ 93 \ 94 __p; \ 95}) 96 97/* 98 * Evaluates to the value of the per-cpu variable name. 99 */ 100#define __PCPU_GET(name) __extension__ ({ \ 101 __pcpu_type(name) __result; \ 102 \ 103 if (sizeof(__result) == 1) { \ 104 u_char __b; \ 105 __asm __volatile("movb %%fs:%1,%0" \ 106 : "=r" (__b) \ 107 : "m" (*(u_char *)(__pcpu_offset(name)))); \ 108 __result = *(__pcpu_type(name) *)(void *)&__b; \ 109 } else if (sizeof(__result) == 2) { \ 110 u_short __w; \ 111 __asm __volatile("movw %%fs:%1,%0" \ 112 : "=r" (__w) \ 113 : "m" (*(u_short *)(__pcpu_offset(name)))); \ 114 __result = *(__pcpu_type(name) *)(void *)&__w; \ 115 } else if (sizeof(__result) == 4) { \ 116 u_int __i; \ 117 __asm __volatile("movl %%fs:%1,%0" \ 118 : "=r" (__i) \ 119 : "m" (*(u_int *)(__pcpu_offset(name)))); \ 120 __result = *(__pcpu_type(name) *)(void *)&__i; \ 121 } else { \ 122 __result = *__PCPU_PTR(name); \ 123 } \ 124 \ 125 __result; \ 126}) 127 128/* 129 * Sets the value of the per-cpu variable name to value val. 130 */ 131#define __PCPU_SET(name, val) { \ 132 __pcpu_type(name) __val = (val); \ 133 \ 134 if (sizeof(__val) == 1) { \ 135 u_char __b; \ 136 __b = *(u_char *)&__val; \ 137 __asm __volatile("movb %1,%%fs:%0" \ 138 : "=m" (*(u_char *)(__pcpu_offset(name))) \ 139 : "r" (__b)); \ 140 } else if (sizeof(__val) == 2) { \ 141 u_short __w; \ 142 __w = *(u_short *)&__val; \ 143 __asm __volatile("movw %1,%%fs:%0" \ 144 : "=m" (*(u_short *)(__pcpu_offset(name))) \ 145 : "r" (__w)); \ 146 } else if (sizeof(__val) == 4) { \ 147 u_int __i; \ 148 __i = *(u_int *)&__val; \ 149 __asm __volatile("movl %1,%%fs:%0" \ 150 : "=m" (*(u_int *)(__pcpu_offset(name))) \ 151 : "r" (__i)); \ 152 } else { \ 153 *__PCPU_PTR(name) = __val; \ 154 } \ 155} 156 157#define PCPU_GET(member) __PCPU_GET(pc_ ## member) 158#define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 159#define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 160 161static __inline struct thread * 162__curthread(void) 163{ 164 struct thread *td; 165 166 __asm __volatile("movl %%fs:0,%0" : "=r" (td)); 167 return (td); 168} 169#define curthread (__curthread()) 170 171#else 172#error this file needs to be ported to your compiler 173#endif 174 175#endif /* _KERNEL */ 176 177#endif /* ! _MACHINE_PCPU_H_ */ 178