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
Version:
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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/8.2/sys/i386/include/pcpu.h 214318 2010-10-25 06:33:19Z julian $ 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 #define PCPU_XEN_FIELDS \ 66 ; \ 67 u_int pc_cr3; /* track cr3 for R1/R3*/ \ 68 vm_paddr_t *pc_pdir_shadow; \ 69 uint64_t pc_processed_system_time; \ 70 struct shadow_time_info pc_shadow_time; \ 71 int pc_resched_irq; \ 72 int pc_callfunc_irq; \ 73 int pc_virq_to_irq[NR_VIRQS]; \ 74 int pc_ipi_to_irq[NR_IPIS] 75 #else 76 #define PCPU_XEN_FIELDS 77 #endif 78 79 #define PCPU_MD_FIELDS \ 80 char pc_monitorbuf[128] __aligned(128); /* cache line */ \ 81 struct pcpu *pc_prvspace; /* Self-reference */ \ 82 struct pmap *pc_curpmap; \ 83 struct i386tss pc_common_tss; \ 84 struct segment_descriptor pc_common_tssd; \ 85 struct segment_descriptor *pc_tss_gdt; \ 86 struct segment_descriptor *pc_fsgs_gdt; \ 87 int pc_currentldt; \ 88 u_int pc_acpi_id; /* ACPI CPU id */ \ 89 u_int pc_apic_id; \ 90 int pc_private_tss; /* Flag indicating private tss*/\ 91 u_int pc_cmci_mask /* MCx banks for CMCI */ \ 92 PCPU_XEN_FIELDS 93 94 #ifdef _KERNEL 95 96 #ifdef lint 97 98 extern struct pcpu *pcpup; 99 100 #define PCPU_GET(member) (pcpup->pc_ ## member) 101 #define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val)) 102 #define PCPU_INC(member) PCPU_ADD(member, 1) 103 #define PCPU_PTR(member) (&pcpup->pc_ ## member) 104 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 105 106 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 107 108 /* 109 * Evaluates to the byte offset of the per-cpu variable name. 110 */ 111 #define __pcpu_offset(name) \ 112 __offsetof(struct pcpu, name) 113 114 /* 115 * Evaluates to the type of the per-cpu variable name. 116 */ 117 #define __pcpu_type(name) \ 118 __typeof(((struct pcpu *)0)->name) 119 120 /* 121 * Evaluates to the address of the per-cpu variable name. 122 */ 123 #define __PCPU_PTR(name) __extension__ ({ \ 124 __pcpu_type(name) *__p; \ 125 \ 126 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \ 127 : "=r" (__p) \ 128 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 129 "i" (__pcpu_offset(name))); \ 130 \ 131 __p; \ 132 }) 133 134 /* 135 * Evaluates to the value of the per-cpu variable name. 136 */ 137 #define __PCPU_GET(name) __extension__ ({ \ 138 __pcpu_type(name) __res; \ 139 struct __s { \ 140 u_char __b[MIN(sizeof(__res), 4)]; \ 141 } __s; \ 142 \ 143 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 144 sizeof(__res) == 4) { \ 145 __asm __volatile("mov %%fs:%1,%0" \ 146 : "=r" (__s) \ 147 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 148 *(struct __s *)(void *)&__res = __s; \ 149 } else { \ 150 __res = *__PCPU_PTR(name); \ 151 } \ 152 __res; \ 153 }) 154 155 /* 156 * Adds a value of the per-cpu counter name. The implementation 157 * must be atomic with respect to interrupts. 158 */ 159 #define __PCPU_ADD(name, val) do { \ 160 __pcpu_type(name) __val; \ 161 struct __s { \ 162 u_char __b[MIN(sizeof(__val), 4)]; \ 163 } __s; \ 164 \ 165 __val = (val); \ 166 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 167 sizeof(__val) == 4) { \ 168 __s = *(struct __s *)(void *)&__val; \ 169 __asm __volatile("add %1,%%fs:%0" \ 170 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 171 : "r" (__s)); \ 172 } else \ 173 *__PCPU_PTR(name) += __val; \ 174 } while (0) 175 176 /* 177 * Increments the value of the per-cpu counter name. The implementation 178 * must be atomic with respect to interrupts. 179 */ 180 #define __PCPU_INC(name) do { \ 181 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 182 sizeof(__pcpu_type(name)) == 2 || \ 183 sizeof(__pcpu_type(name)) == 4); \ 184 if (sizeof(__pcpu_type(name)) == 1) { \ 185 __asm __volatile("incb %%fs:%0" \ 186 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 187 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 188 } else if (sizeof(__pcpu_type(name)) == 2) { \ 189 __asm __volatile("incw %%fs:%0" \ 190 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 191 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 192 } else if (sizeof(__pcpu_type(name)) == 4) { \ 193 __asm __volatile("incl %%fs:%0" \ 194 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 195 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 196 } \ 197 } while (0) 198 199 /* 200 * Sets the value of the per-cpu variable name to value val. 201 */ 202 #define __PCPU_SET(name, val) do { \ 203 __pcpu_type(name) __val; \ 204 struct __s { \ 205 u_char __b[MIN(sizeof(__val), 4)]; \ 206 } __s; \ 207 \ 208 __val = (val); \ 209 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 210 sizeof(__val) == 4) { \ 211 __s = *(struct __s *)(void *)&__val; \ 212 __asm __volatile("mov %1,%%fs:%0" \ 213 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 214 : "r" (__s)); \ 215 } else { \ 216 *__PCPU_PTR(name) = __val; \ 217 } \ 218 } while (0) 219 220 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 221 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 222 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 223 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 224 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 225 226 static __inline __pure2 struct thread * 227 __curthread(void) 228 { 229 struct thread *td; 230 231 __asm("movl %%fs:0,%0" : "=r" (td)); 232 return (td); 233 } 234 #define curthread (__curthread()) 235 236 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 237 238 #error "this file needs to be ported to your compiler" 239 240 #endif /* lint, etc. */ 241 242 #endif /* _KERNEL */ 243 244 #endif /* !_MACHINE_PCPU_H_ */
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