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 #ifdef _KERNEL 37 38 /* 39 * The SMP parts are setup in pmap.c and locore.s for the BSP, and 40 * mp_machdep.c sets up the data for the AP's to "see" when they awake. 41 * The reason for doing it via a struct is so that an array of pointers 42 * to each CPU's data can be set up for things like "check curproc on all 43 * other processors" 44 */ 45 #define PCPU_MD_FIELDS \ 46 struct pcpu *pc_prvspace; /* Self-reference */ \ 47 struct pmap *pc_curpmap; \ 48 struct amd64tss *pc_tssp; \ 49 register_t pc_rsp0; \ 50 register_t pc_scratch_rsp; /* User %rsp in syscall */ \ 51 u_int pc_apic_id; \ 52 u_int pc_acpi_id /* ACPI CPU id */ 53 54 #ifdef lint 55 56 extern struct pcpu *pcpup; 57 58 #define PCPU_GET(member) (pcpup->pc_ ## member) 59 #define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val)) 60 #define PCPU_INC(member) PCPU_ADD(member, 1) 61 #define PCPU_PTR(member) (&pcpup->pc_ ## member) 62 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 63 64 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 65 66 /* 67 * Evaluates to the byte offset of the per-cpu variable name. 68 */ 69 #define __pcpu_offset(name) \ 70 __offsetof(struct pcpu, name) 71 72 /* 73 * Evaluates to the type of the per-cpu variable name. 74 */ 75 #define __pcpu_type(name) \ 76 __typeof(((struct pcpu *)0)->name) 77 78 /* 79 * Evaluates to the address of the per-cpu variable name. 80 */ 81 #define __PCPU_PTR(name) __extension__ ({ \ 82 __pcpu_type(name) *__p; \ 83 \ 84 __asm __volatile("movq %%gs:%1,%0; addq %2,%0" \ 85 : "=r" (__p) \ 86 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 87 "i" (__pcpu_offset(name))); \ 88 \ 89 __p; \ 90 }) 91 92 /* 93 * Evaluates to the value of the per-cpu variable name. 94 */ 95 #define __PCPU_GET(name) __extension__ ({ \ 96 __pcpu_type(name) __res; \ 97 struct __s { \ 98 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 99 } __s; \ 100 \ 101 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 102 sizeof(__res) == 4 || sizeof(__res) == 8) { \ 103 __asm __volatile("mov %%gs:%1,%0" \ 104 : "=r" (__s) \ 105 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 106 *(struct __s *)(void *)&__res = __s; \ 107 } else { \ 108 __res = *__PCPU_PTR(name); \ 109 } \ 110 __res; \ 111 }) 112 113 /* 114 * Adds the value to the per-cpu counter name. The implementation 115 * must be atomic with respect to interrupts. 116 */ 117 #define __PCPU_ADD(name, val) do { \ 118 __pcpu_type(name) __val; \ 119 struct __s { \ 120 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 121 } __s; \ 122 \ 123 __val = (val); \ 124 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 125 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 126 __s = *(struct __s *)(void *)&__val; \ 127 __asm __volatile("add %1,%%gs:%0" \ 128 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 129 : "r" (__s)); \ 130 } else \ 131 *__PCPU_PTR(name) += __val; \ 132 } while (0) 133 134 /* 135 * Increments the value of the per-cpu counter name. The implementation 136 * must be atomic with respect to interrupts. 137 */ 138 #define __PCPU_INC(name) do { \ 139 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 140 sizeof(__pcpu_type(name)) == 2 || \ 141 sizeof(__pcpu_type(name)) == 4 || \ 142 sizeof(__pcpu_type(name)) == 8); \ 143 if (sizeof(__pcpu_type(name)) == 1) { \ 144 __asm __volatile("incb %%gs:%0" \ 145 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 146 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 147 } else if (sizeof(__pcpu_type(name)) == 2) { \ 148 __asm __volatile("incw %%gs:%0" \ 149 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 150 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 151 } else if (sizeof(__pcpu_type(name)) == 4) { \ 152 __asm __volatile("incl %%gs:%0" \ 153 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 154 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 155 } else if (sizeof(__pcpu_type(name)) == 8) { \ 156 __asm __volatile("incq %%gs:%0" \ 157 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 158 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 159 } \ 160 } while (0) 161 162 /* 163 * Sets the value of the per-cpu variable name to value val. 164 */ 165 #define __PCPU_SET(name, val) { \ 166 __pcpu_type(name) __val; \ 167 struct __s { \ 168 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 169 } __s; \ 170 \ 171 __val = (val); \ 172 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 173 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 174 __s = *(struct __s *)(void *)&__val; \ 175 __asm __volatile("mov %1,%%gs:%0" \ 176 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 177 : "r" (__s)); \ 178 } else { \ 179 *__PCPU_PTR(name) = __val; \ 180 } \ 181 } 182 183 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 184 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 185 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 186 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 187 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 188 189 static __inline struct thread * 190 __curthread(void) 191 { 192 struct thread *td; 193 194 __asm __volatile("movq %%gs:0,%0" : "=r" (td)); 195 return (td); 196 } 197 #define curthread (__curthread()) 198 199 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 200 201 #error "this file needs to be ported to your compiler" 202 203 #endif /* lint, etc. */ 204 205 #endif /* _KERNEL */ 206 207 #endif /* !_MACHINE_PCPU_H_ */ 208