Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/pcpu.h
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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: releng/8.1/sys/i386/include/pcpu.h 199583 2009-11-20 15:27:52Z jhb $ 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 #ifndef NR_VIRQS 49 #define NR_VIRQS 24 50 #endif 51 #ifndef NR_IPIS 52 #define NR_IPIS 2 53 #endif 54 55 /* These are peridically updated in shared_info, and then copied here. */ 56 struct shadow_time_info { 57 uint64_t tsc_timestamp; /* TSC at last update of time vals. */ 58 uint64_t system_timestamp; /* Time, in nanosecs, since boot. */ 59 uint32_t tsc_to_nsec_mul; 60 uint32_t tsc_to_usec_mul; 61 int tsc_shift; 62 uint32_t version; 63 }; 64 65 66 #define PCPU_MD_FIELDS \ 67 char pc_monitorbuf[128] __aligned(128); /* cache line */ \ 68 struct pcpu *pc_prvspace; /* Self-reference */ \ 69 struct pmap *pc_curpmap; \ 70 struct i386tss pc_common_tss; \ 71 struct segment_descriptor pc_common_tssd; \ 72 struct segment_descriptor *pc_tss_gdt; \ 73 struct segment_descriptor *pc_fsgs_gdt; \ 74 vm_paddr_t *pc_pdir_shadow; \ 75 int pc_currentldt; \ 76 u_int pc_acpi_id; /* ACPI CPU id */ \ 77 u_int pc_apic_id; \ 78 int pc_private_tss; /* Flag indicating private tss*/\ 79 u_int pc_cr3; /* track cr3 for R1/R3*/ \ 80 u_int pc_pdir; \ 81 u_int pc_lazypmap; \ 82 u_int pc_rendezvous; \ 83 u_int pc_cpuast; \ 84 uint64_t pc_processed_system_time; \ 85 struct shadow_time_info pc_shadow_time; \ 86 int pc_resched_irq; \ 87 int pc_callfunc_irq; \ 88 int pc_virq_to_irq[NR_VIRQS]; \ 89 int pc_ipi_to_irq[NR_IPIS] 90 91 92 93 #else 94 #define PCPU_MD_FIELDS \ 95 char pc_monitorbuf[128] __aligned(128); /* cache line */ \ 96 struct pcpu *pc_prvspace; /* Self-reference */ \ 97 struct pmap *pc_curpmap; \ 98 struct i386tss pc_common_tss; \ 99 struct segment_descriptor pc_common_tssd; \ 100 struct segment_descriptor *pc_tss_gdt; \ 101 struct segment_descriptor *pc_fsgs_gdt; \ 102 int pc_currentldt; \ 103 u_int pc_acpi_id; /* ACPI CPU id */ \ 104 u_int pc_apic_id; \ 105 int pc_private_tss /* Flag indicating private tss */ 106 107 #endif 108 109 #ifdef _KERNEL 110 111 #ifdef lint 112 113 extern struct pcpu *pcpup; 114 115 #define PCPU_GET(member) (pcpup->pc_ ## member) 116 #define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val)) 117 #define PCPU_INC(member) PCPU_ADD(member, 1) 118 #define PCPU_PTR(member) (&pcpup->pc_ ## member) 119 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 120 121 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 122 123 /* 124 * Evaluates to the byte offset of the per-cpu variable name. 125 */ 126 #define __pcpu_offset(name) \ 127 __offsetof(struct pcpu, name) 128 129 /* 130 * Evaluates to the type of the per-cpu variable name. 131 */ 132 #define __pcpu_type(name) \ 133 __typeof(((struct pcpu *)0)->name) 134 135 /* 136 * Evaluates to the address of the per-cpu variable name. 137 */ 138 #define __PCPU_PTR(name) __extension__ ({ \ 139 __pcpu_type(name) *__p; \ 140 \ 141 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \ 142 : "=r" (__p) \ 143 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 144 "i" (__pcpu_offset(name))); \ 145 \ 146 __p; \ 147 }) 148 149 /* 150 * Evaluates to the value of the per-cpu variable name. 151 */ 152 #define __PCPU_GET(name) __extension__ ({ \ 153 __pcpu_type(name) __res; \ 154 struct __s { \ 155 u_char __b[MIN(sizeof(__pcpu_type(name)), 4)]; \ 156 } __s; \ 157 \ 158 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 159 sizeof(__res) == 4) { \ 160 __asm __volatile("mov %%fs:%1,%0" \ 161 : "=r" (__s) \ 162 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 163 *(struct __s *)(void *)&__res = __s; \ 164 } else { \ 165 __res = *__PCPU_PTR(name); \ 166 } \ 167 __res; \ 168 }) 169 170 /* 171 * Adds a value of the per-cpu counter name. The implementation 172 * must be atomic with respect to interrupts. 173 */ 174 #define __PCPU_ADD(name, val) do { \ 175 __pcpu_type(name) __val; \ 176 struct __s { \ 177 u_char __b[MIN(sizeof(__pcpu_type(name)), 4)]; \ 178 } __s; \ 179 \ 180 __val = (val); \ 181 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 182 sizeof(__val) == 4) { \ 183 __s = *(struct __s *)(void *)&__val; \ 184 __asm __volatile("add %1,%%fs:%0" \ 185 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 186 : "r" (__s)); \ 187 } else \ 188 *__PCPU_PTR(name) += __val; \ 189 } while (0) 190 191 /* 192 * Increments the value of the per-cpu counter name. The implementation 193 * must be atomic with respect to interrupts. 194 */ 195 #define __PCPU_INC(name) do { \ 196 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 197 sizeof(__pcpu_type(name)) == 2 || \ 198 sizeof(__pcpu_type(name)) == 4); \ 199 if (sizeof(__pcpu_type(name)) == 1) { \ 200 __asm __volatile("incb %%fs:%0" \ 201 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 202 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 203 } else if (sizeof(__pcpu_type(name)) == 2) { \ 204 __asm __volatile("incw %%fs:%0" \ 205 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 206 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 207 } else if (sizeof(__pcpu_type(name)) == 4) { \ 208 __asm __volatile("incl %%fs:%0" \ 209 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 210 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 211 } \ 212 } while (0) 213 214 /* 215 * Sets the value of the per-cpu variable name to value val. 216 */ 217 #define __PCPU_SET(name, val) { \ 218 __pcpu_type(name) __val; \ 219 struct __s { \ 220 u_char __b[MIN(sizeof(__pcpu_type(name)), 4)]; \ 221 } __s; \ 222 \ 223 __val = (val); \ 224 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 225 sizeof(__val) == 4) { \ 226 __s = *(struct __s *)(void *)&__val; \ 227 __asm __volatile("mov %1,%%fs:%0" \ 228 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 229 : "r" (__s)); \ 230 } else { \ 231 *__PCPU_PTR(name) = __val; \ 232 } \ 233 } 234 235 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 236 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 237 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 238 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 239 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 240 241 static __inline struct thread * 242 __curthread(void) 243 { 244 struct thread *td; 245 246 __asm __volatile("movl %%fs:0,%0" : "=r" (td)); 247 return (td); 248 } 249 #define curthread (__curthread()) 250 251 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 252 253 #error "this file needs to be ported to your compiler" 254 255 #endif /* lint, etc. */ 256 257 #endif /* _KERNEL */ 258 259 #endif /* !_MACHINE_PCPU_H_ */
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