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_PTR(member) (&pcpup->pc_ ## member) 60 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 61 62 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 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("movq %%gs:%1,%0; addq %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) __res; \ 95 struct __s { \ 96 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 97 } __s; \ 98 \ 99 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 100 sizeof(__res) == 4 || sizeof(__res) == 8) { \ 101 __asm __volatile("mov %%gs:%1,%0" \ 102 : "=r" (__s) \ 103 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 104 *(struct __s *)(void *)&__res = __s; \ 105 } else { \ 106 __res = *__PCPU_PTR(name); \ 107 } \ 108 __res; \ 109 }) 110 111 /* 112 * Sets the value of the per-cpu variable name to value val. 113 */ 114 #define __PCPU_SET(name, val) { \ 115 __pcpu_type(name) __val; \ 116 struct __s { \ 117 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 118 } __s; \ 119 \ 120 __val = (val); \ 121 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 122 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 123 __s = *(struct __s *)(void *)&__val; \ 124 __asm __volatile("mov %1,%%gs:%0" \ 125 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 126 : "r" (__s)); \ 127 } else { \ 128 *__PCPU_PTR(name) = __val; \ 129 } \ 130 } 131 132 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 133 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 134 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 135 136 static __inline struct thread * 137 __curthread(void) 138 { 139 struct thread *td; 140 141 __asm __volatile("movq %%gs:0,%0" : "=r" (td)); 142 return (td); 143 } 144 #define curthread (__curthread()) 145 146 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 147 148 #error "this file needs to be ported to your compiler" 149 150 #endif /* lint, etc. */ 151 152 #endif /* _KERNEL */ 153 154 #endif /* !_MACHINE_PCPU_H_ */ 155