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 * $FreeBSD$ 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 #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; /* ACPI CPU id */ \ 57 u_int pc_apic_id; \ 58 int pc_private_tss /* Flag indicating private tss */ 59 60 #ifdef lint 61 62 extern struct pcpu *pcpup; 63 64 #define PCPU_GET(member) (pcpup->pc_ ## member) 65 #define PCPU_LAZY_INC(member) (++pcpup->pc_ ## member) 66 #define PCPU_PTR(member) (&pcpup->pc_ ## member) 67 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 68 69 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 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) __res; \ 102 struct __s { \ 103 u_char __b[MIN(sizeof(__pcpu_type(name)), 4)]; \ 104 } __s; \ 105 \ 106 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 107 sizeof(__res) == 4) { \ 108 __asm __volatile("mov %%fs:%1,%0" \ 109 : "=r" (__s) \ 110 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 111 *(struct __s *)(void *)&__res = __s; \ 112 } else { \ 113 __res = *__PCPU_PTR(name); \ 114 } \ 115 __res; \ 116 }) 117 118 /* 119 * Increments the value of the per-cpu counter name. The implementation 120 * must be atomic with respect to interrupts. 121 */ 122 #define __PCPU_LAZY_INC(name) do { \ 123 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 124 sizeof(__pcpu_type(name)) == 2 || \ 125 sizeof(__pcpu_type(name)) == 4); \ 126 if (sizeof(__pcpu_type(name)) == 1) { \ 127 __asm __volatile("incb %%fs:%0" \ 128 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 129 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 130 } else if (sizeof(__pcpu_type(name)) == 2) { \ 131 __asm __volatile("incw %%fs:%0" \ 132 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 133 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 134 } else if (sizeof(__pcpu_type(name)) == 4) { \ 135 __asm __volatile("incl %%fs:%0" \ 136 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 137 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 138 } \ 139 } while (0) 140 141 /* 142 * Sets the value of the per-cpu variable name to value val. 143 */ 144 #define __PCPU_SET(name, val) { \ 145 __pcpu_type(name) __val; \ 146 struct __s { \ 147 u_char __b[MIN(sizeof(__pcpu_type(name)), 4)]; \ 148 } __s; \ 149 \ 150 __val = (val); \ 151 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 152 sizeof(__val) == 4) { \ 153 __s = *(struct __s *)(void *)&__val; \ 154 __asm __volatile("mov %1,%%fs:%0" \ 155 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 156 : "r" (__s)); \ 157 } else { \ 158 *__PCPU_PTR(name) = __val; \ 159 } \ 160 } 161 162 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 163 #define PCPU_LAZY_INC(member) __PCPU_LAZY_INC(pc_ ## member) 164 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 165 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 166 167 static __inline struct thread * 168 __curthread(void) 169 { 170 struct thread *td; 171 172 __asm __volatile("movl %%fs:0,%0" : "=r" (td)); 173 return (td); 174 } 175 #define curthread (__curthread()) 176 177 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 178 179 #error "this file needs to be ported to your compiler" 180 181 #endif /* lint, etc. */ 182 183 #endif /* _KERNEL */ 184 185 #endif /* !_MACHINE_PCPU_H_ */ 186