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 this file needs sys/cdefs.h as a prerequisite 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 #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(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) \ 63 && defined(__GNUCLIKE___OFFSETOF) 64 65 /* 66 * Evaluates to the byte offset of the per-cpu variable name. 67 */ 68 #define __pcpu_offset(name) \ 69 __offsetof(struct pcpu, name) 70 71 /* 72 * Evaluates to the type of the per-cpu variable name. 73 */ 74 #define __pcpu_type(name) \ 75 __typeof(((struct pcpu *)0)->name) 76 77 /* 78 * Evaluates to the address of the per-cpu variable name. 79 */ 80 #define __PCPU_PTR(name) __extension__ ({ \ 81 __pcpu_type(name) *__p; \ 82 \ 83 __asm __volatile("movq %%gs:%1,%0; addq %2,%0" \ 84 : "=r" (__p) \ 85 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 86 "i" (__pcpu_offset(name))); \ 87 \ 88 __p; \ 89 }) 90 91 /* 92 * Evaluates to the value of the per-cpu variable name. 93 */ 94 #define __PCPU_GET(name) __extension__ ({ \ 95 __pcpu_type(name) __result; \ 96 \ 97 if (sizeof(__result) == 1 || sizeof(__result) == 2 || \ 98 sizeof(__result) == 4 || sizeof(__result) == 8) { \ 99 struct __s { \ 100 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 101 } __s; \ 102 __asm __volatile("mov %%gs:%1,%0" \ 103 : "=r" (__s) \ 104 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 105 *(struct __s *)(void *)&__result = __s; \ 106 } else { \ 107 __result = *__PCPU_PTR(name); \ 108 } \ 109 \ 110 __result; \ 111 }) 112 113 /* 114 * Sets the value of the per-cpu variable name to value val. 115 */ 116 #define __PCPU_SET(name, val) { \ 117 __pcpu_type(name) __val = (val); \ 118 \ 119 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 120 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 121 struct __s { \ 122 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 123 } __s; \ 124 __s = *(struct __s *)(void *)&__val; \ 125 __asm __volatile("mov %1,%%gs:%0" \ 126 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 127 : "r" (__s)); \ 128 } else { \ 129 *__PCPU_PTR(name) = __val; \ 130 } \ 131 } 132 133 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 134 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 135 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 136 137 static __inline struct thread * 138 __curthread(void) 139 { 140 struct thread *td; 141 142 __asm __volatile("movq %%gs:0,%0" : "=r" (td)); 143 return (td); 144 } 145 #define curthread (__curthread()) 146 147 #else 148 #error this file needs to be ported to your compiler 149 #endif 150 151 #endif /* _KERNEL */ 152 153 #endif /* ! _MACHINE_PCPU_H_ */ 154