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 #ifdef _KERNEL 33 34 /* 35 * The SMP parts are setup in pmap.c and locore.s for the BSP, and 36 * mp_machdep.c sets up the data for the AP's to "see" when they awake. 37 * The reason for doing it via a struct is so that an array of pointers 38 * to each CPU's data can be set up for things like "check curproc on all 39 * other processors" 40 */ 41 #define PCPU_MD_FIELDS \ 42 struct pcpu *pc_prvspace; /* Self-reference */ \ 43 struct pmap *pc_curpmap; \ 44 struct amd64tss *pc_tssp; \ 45 register_t pc_rsp0; \ 46 register_t pc_scratch_rsp; /* User %rsp in syscall */ \ 47 u_int pc_apic_id; \ 48 u_int pc_acpi_id /* ACPI CPU id */ 49 50 #if defined(lint) 51 52 extern struct pcpu *pcpup; 53 54 #define PCPU_GET(member) (pcpup->pc_ ## member) 55 #define PCPU_PTR(member) (&pcpup->pc_ ## member) 56 #define PCPU_SET(member,value) (pcpup->pc_ ## member = (value)) 57 58 #elif defined(__GNUC__) 59 60 /* 61 * Evaluates to the byte offset of the per-cpu variable name. 62 */ 63 #define __pcpu_offset(name) \ 64 __offsetof(struct pcpu, name) 65 66 /* 67 * Evaluates to the type of the per-cpu variable name. 68 */ 69 #define __pcpu_type(name) \ 70 __typeof(((struct pcpu *)0)->name) 71 72 /* 73 * Evaluates to the address of the per-cpu variable name. 74 */ 75 #define __PCPU_PTR(name) __extension__ ({ \ 76 __pcpu_type(name) *__p; \ 77 \ 78 __asm __volatile("movq %%gs:%1,%0; addq %2,%0" \ 79 : "=r" (__p) \ 80 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 81 "i" (__pcpu_offset(name))); \ 82 \ 83 __p; \ 84 }) 85 86 /* 87 * Evaluates to the value of the per-cpu variable name. 88 */ 89 #define __PCPU_GET(name) __extension__ ({ \ 90 __pcpu_type(name) __result; \ 91 \ 92 if (sizeof(__result) == 1) { \ 93 u_char __b; \ 94 __asm __volatile("movb %%gs:%1,%0" \ 95 : "=r" (__b) \ 96 : "m" (*(u_char *)(__pcpu_offset(name)))); \ 97 __result = *(__pcpu_type(name) *)&__b; \ 98 } else if (sizeof(__result) == 2) { \ 99 u_short __w; \ 100 __asm __volatile("movw %%gs:%1,%0" \ 101 : "=r" (__w) \ 102 : "m" (*(u_short *)(__pcpu_offset(name)))); \ 103 __result = *(__pcpu_type(name) *)&__w; \ 104 } else if (sizeof(__result) == 4) { \ 105 u_int __i; \ 106 __asm __volatile("movl %%gs:%1,%0" \ 107 : "=r" (__i) \ 108 : "m" (*(u_int *)(__pcpu_offset(name)))); \ 109 __result = *(__pcpu_type(name) *)&__i; \ 110 } else if (sizeof(__result) == 8) { \ 111 u_long __l; \ 112 __asm __volatile("movq %%gs:%1,%0" \ 113 : "=r" (__l) \ 114 : "m" (*(u_long *)(__pcpu_offset(name)))); \ 115 __result = *(__pcpu_type(name) *)&__l; \ 116 } else { \ 117 __result = *__PCPU_PTR(name); \ 118 } \ 119 \ 120 __result; \ 121 }) 122 123 /* 124 * Sets the value of the per-cpu variable name to value val. 125 */ 126 #define __PCPU_SET(name, val) { \ 127 __pcpu_type(name) __val = (val); \ 128 \ 129 if (sizeof(__val) == 1) { \ 130 u_char __b; \ 131 __b = *(u_char *)&__val; \ 132 __asm __volatile("movb %1,%%gs:%0" \ 133 : "=m" (*(u_char *)(__pcpu_offset(name))) \ 134 : "r" (__b)); \ 135 } else if (sizeof(__val) == 2) { \ 136 u_short __w; \ 137 __w = *(u_short *)&__val; \ 138 __asm __volatile("movw %1,%%gs:%0" \ 139 : "=m" (*(u_short *)(__pcpu_offset(name))) \ 140 : "r" (__w)); \ 141 } else if (sizeof(__val) == 4) { \ 142 u_int __i; \ 143 __i = *(u_int *)&__val; \ 144 __asm __volatile("movl %1,%%gs:%0" \ 145 : "=m" (*(u_int *)(__pcpu_offset(name))) \ 146 : "r" (__i)); \ 147 } else if (sizeof(__val) == 8) { \ 148 u_long __l; \ 149 __l = *(u_long *)&__val; \ 150 __asm __volatile("movq %1,%%gs:%0" \ 151 : "=m" (*(u_long *)(__pcpu_offset(name))) \ 152 : "r" (__l)); \ 153 } else { \ 154 *__PCPU_PTR(name) = __val; \ 155 } \ 156 } 157 158 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 159 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 160 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 161 162 static __inline struct thread * 163 __curthread(void) 164 { 165 struct thread *td; 166 167 __asm __volatile("movq %%gs:0,%0" : "=r" (td)); 168 return (td); 169 } 170 #define curthread (__curthread()) 171 172 #else 173 #error gcc or lint is required to use this file 174 #endif 175 176 #endif /* _KERNEL */ 177 178 #endif /* ! _MACHINE_PCPU_H_ */ 179