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 #include <machine/segments.h> 37 #include <machine/tss.h> 38 39 /* 40 * The SMP parts are setup in pmap.c and locore.s for the BSP, and 41 * mp_machdep.c sets up the data for the AP's to "see" when they awake. 42 * The reason for doing it via a struct is so that an array of pointers 43 * to each CPU's data can be set up for things like "check curproc on all 44 * other processors" 45 */ 46 47 #ifdef XEN 48 #define PCPU_MD_FIELDS \ 49 char pc_monitorbuf[128] __aligned(128); /* cache line */ \ 50 struct pcpu *pc_prvspace; /* Self-reference */ \ 51 struct pmap *pc_curpmap; \ 52 struct i386tss pc_common_tss; \ 53 struct segment_descriptor pc_common_tssd; \ 54 struct segment_descriptor *pc_tss_gdt; \ 55 struct segment_descriptor *pc_fsgs_gdt; \ 56 vm_paddr_t *pc_pdir_shadow; \ 57 int pc_currentldt; \ 58 u_int pc_acpi_id; /* ACPI CPU id */ \ 59 u_int pc_apic_id; \ 60 int pc_private_tss; /* Flag indicating private tss*/\ 61 u_int pc_cr3; /* track cr3 for R1/R3*/ \ 62 u_int pc_pdir; \ 63 u_int pc_lazypmap; \ 64 u_int pc_rendezvous; \ 65 u_int pc_cpuast 66 67 68 #else 69 #define PCPU_MD_FIELDS \ 70 char pc_monitorbuf[128] __aligned(128); /* cache line */ \ 71 struct pcpu *pc_prvspace; /* Self-reference */ \ 72 struct pmap *pc_curpmap; \ 73 struct i386tss pc_common_tss; \ 74 struct segment_descriptor pc_common_tssd; \ 75 struct segment_descriptor *pc_tss_gdt; \ 76 struct segment_descriptor *pc_fsgs_gdt; \ 77 int pc_currentldt; \ 78 u_int pc_acpi_id; /* ACPI CPU id */ \ 79 u_int pc_apic_id; \ 80 int pc_private_tss /* Flag indicating private tss */ 81 82 #endif 83 84 #ifdef _KERNEL 85 86 #ifdef lint 87 88 extern struct pcpu *pcpup; 89 90 #define PCPU_GET(member) (pcpup->pc_ ## member) 91 #define PCPU_ADD(member, val) (pcpu->pc_ ## member += (val)) 92 #define PCPU_INC(member) PCPU_ADD(member, 1) 93 #define PCPU_PTR(member) (&pcpup->pc_ ## member) 94 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 95 96 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 97 98 /* 99 * Evaluates to the byte offset of the per-cpu variable name. 100 */ 101 #define __pcpu_offset(name) \ 102 __offsetof(struct pcpu, name) 103 104 /* 105 * Evaluates to the type of the per-cpu variable name. 106 */ 107 #define __pcpu_type(name) \ 108 __typeof(((struct pcpu *)0)->name) 109 110 /* 111 * Evaluates to the address of the per-cpu variable name. 112 */ 113 #define __PCPU_PTR(name) __extension__ ({ \ 114 __pcpu_type(name) *__p; \ 115 \ 116 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \ 117 : "=r" (__p) \ 118 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 119 "i" (__pcpu_offset(name))); \ 120 \ 121 __p; \ 122 }) 123 124 /* 125 * Evaluates to the value of the per-cpu variable name. 126 */ 127 #define __PCPU_GET(name) __extension__ ({ \ 128 __pcpu_type(name) __res; \ 129 struct __s { \ 130 u_char __b[MIN(sizeof(__pcpu_type(name)), 4)]; \ 131 } __s; \ 132 \ 133 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 134 sizeof(__res) == 4) { \ 135 __asm __volatile("mov %%fs:%1,%0" \ 136 : "=r" (__s) \ 137 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 138 *(struct __s *)(void *)&__res = __s; \ 139 } else { \ 140 __res = *__PCPU_PTR(name); \ 141 } \ 142 __res; \ 143 }) 144 145 /* 146 * Adds a value of the per-cpu counter name. The implementation 147 * must be atomic with respect to interrupts. 148 */ 149 #define __PCPU_ADD(name, val) do { \ 150 __pcpu_type(name) __val; \ 151 struct __s { \ 152 u_char __b[MIN(sizeof(__pcpu_type(name)), 4)]; \ 153 } __s; \ 154 \ 155 __val = (val); \ 156 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 157 sizeof(__val) == 4) { \ 158 __s = *(struct __s *)(void *)&__val; \ 159 __asm __volatile("add %1,%%fs:%0" \ 160 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 161 : "r" (__s)); \ 162 } else \ 163 *__PCPU_PTR(name) += __val; \ 164 } while (0) 165 166 /* 167 * Increments the value of the per-cpu counter name. The implementation 168 * must be atomic with respect to interrupts. 169 */ 170 #define __PCPU_INC(name) do { \ 171 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 172 sizeof(__pcpu_type(name)) == 2 || \ 173 sizeof(__pcpu_type(name)) == 4); \ 174 if (sizeof(__pcpu_type(name)) == 1) { \ 175 __asm __volatile("incb %%fs:%0" \ 176 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 177 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 178 } else if (sizeof(__pcpu_type(name)) == 2) { \ 179 __asm __volatile("incw %%fs:%0" \ 180 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 181 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 182 } else if (sizeof(__pcpu_type(name)) == 4) { \ 183 __asm __volatile("incl %%fs:%0" \ 184 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 185 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 186 } \ 187 } while (0) 188 189 /* 190 * Sets the value of the per-cpu variable name to value val. 191 */ 192 #define __PCPU_SET(name, val) { \ 193 __pcpu_type(name) __val; \ 194 struct __s { \ 195 u_char __b[MIN(sizeof(__pcpu_type(name)), 4)]; \ 196 } __s; \ 197 \ 198 __val = (val); \ 199 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 200 sizeof(__val) == 4) { \ 201 __s = *(struct __s *)(void *)&__val; \ 202 __asm __volatile("mov %1,%%fs:%0" \ 203 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 204 : "r" (__s)); \ 205 } else { \ 206 *__PCPU_PTR(name) = __val; \ 207 } \ 208 } 209 210 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 211 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 212 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 213 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 214 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 215 216 static __inline struct thread * 217 __curthread(void) 218 { 219 struct thread *td; 220 221 __asm __volatile("movl %%fs:0,%0" : "=r" (td)); 222 return (td); 223 } 224 #define curthread (__curthread()) 225 226 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 227 228 #error "this file needs to be ported to your compiler" 229 230 #endif /* lint, etc. */ 231 232 #endif /* _KERNEL */ 233 234 #endif /* !_MACHINE_PCPU_H_ */ 235