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 * $FreeBSD$ 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 #if defined(XEN) || defined(XENHVM) 48 #ifndef NR_VIRQS 49 #define NR_VIRQS 24 50 #endif 51 #ifndef NR_IPIS 52 #define NR_IPIS 2 53 #endif 54 #endif 55 56 #if defined(XEN) 57 58 /* These are peridically updated in shared_info, and then copied here. */ 59 struct shadow_time_info { 60 uint64_t tsc_timestamp; /* TSC at last update of time vals. */ 61 uint64_t system_timestamp; /* Time, in nanosecs, since boot. */ 62 uint32_t tsc_to_nsec_mul; 63 uint32_t tsc_to_usec_mul; 64 int tsc_shift; 65 uint32_t version; 66 }; 67 68 #define PCPU_XEN_FIELDS \ 69 ; \ 70 u_int pc_cr3; /* track cr3 for R1/R3*/ \ 71 vm_paddr_t *pc_pdir_shadow; \ 72 uint64_t pc_processed_system_time; \ 73 struct shadow_time_info pc_shadow_time; \ 74 int pc_resched_irq; \ 75 int pc_callfunc_irq; \ 76 int pc_virq_to_irq[NR_VIRQS]; \ 77 int pc_ipi_to_irq[NR_IPIS] 78 79 #elif defined(XENHVM) && !defined(MODXENHVM) 80 81 /* This is now unused, but remains here for KBI compatibility reasons. */ 82 #define PCPU_XEN_FIELDS \ 83 ; \ 84 unsigned int pc_last_processed_l1i; \ 85 unsigned int pc_last_processed_l2i 86 87 #else /* !XEN && (!XENHVM || MODXENHVM) */ 88 89 #define PCPU_XEN_FIELDS 90 91 #endif 92 93 #define PCPU_MD_FIELDS \ 94 char pc_monitorbuf[128] __aligned(128); /* cache line */ \ 95 struct pcpu *pc_prvspace; /* Self-reference */ \ 96 struct pmap *pc_curpmap; \ 97 struct i386tss pc_common_tss; \ 98 struct segment_descriptor pc_common_tssd; \ 99 struct segment_descriptor *pc_tss_gdt; \ 100 struct segment_descriptor *pc_fsgs_gdt; \ 101 int pc_currentldt; \ 102 u_int pc_acpi_id; /* ACPI CPU id */ \ 103 u_int pc_apic_id; \ 104 int pc_private_tss; /* Flag indicating private tss*/\ 105 u_int pc_cmci_mask /* MCx banks for CMCI */ \ 106 PCPU_XEN_FIELDS 107 108 #ifdef _KERNEL 109 110 #ifdef lint 111 112 extern struct pcpu *pcpup; 113 114 #define PCPU_GET(member) (pcpup->pc_ ## member) 115 #define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val)) 116 #define PCPU_INC(member) PCPU_ADD(member, 1) 117 #define PCPU_PTR(member) (&pcpup->pc_ ## member) 118 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 119 120 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 121 122 /* 123 * Evaluates to the byte offset of the per-cpu variable name. 124 */ 125 #define __pcpu_offset(name) \ 126 __offsetof(struct pcpu, name) 127 128 /* 129 * Evaluates to the type of the per-cpu variable name. 130 */ 131 #define __pcpu_type(name) \ 132 __typeof(((struct pcpu *)0)->name) 133 134 /* 135 * Evaluates to the address of the per-cpu variable name. 136 */ 137 #define __PCPU_PTR(name) __extension__ ({ \ 138 __pcpu_type(name) *__p; \ 139 \ 140 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \ 141 : "=r" (__p) \ 142 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 143 "i" (__pcpu_offset(name))); \ 144 \ 145 __p; \ 146 }) 147 148 /* 149 * Evaluates to the value of the per-cpu variable name. 150 */ 151 #define __PCPU_GET(name) __extension__ ({ \ 152 __pcpu_type(name) __res; \ 153 struct __s { \ 154 u_char __b[MIN(sizeof(__res), 4)]; \ 155 } __s; \ 156 \ 157 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 158 sizeof(__res) == 4) { \ 159 __asm __volatile("mov %%fs:%1,%0" \ 160 : "=r" (__s) \ 161 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 162 *(struct __s *)(void *)&__res = __s; \ 163 } else { \ 164 __res = *__PCPU_PTR(name); \ 165 } \ 166 __res; \ 167 }) 168 169 /* 170 * Adds a value of the per-cpu counter name. The implementation 171 * must be atomic with respect to interrupts. 172 */ 173 #define __PCPU_ADD(name, val) do { \ 174 __pcpu_type(name) __val; \ 175 struct __s { \ 176 u_char __b[MIN(sizeof(__val), 4)]; \ 177 } __s; \ 178 \ 179 __val = (val); \ 180 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 181 sizeof(__val) == 4) { \ 182 __s = *(struct __s *)(void *)&__val; \ 183 __asm __volatile("add %1,%%fs:%0" \ 184 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 185 : "r" (__s)); \ 186 } else \ 187 *__PCPU_PTR(name) += __val; \ 188 } while (0) 189 190 /* 191 * Increments the value of the per-cpu counter name. The implementation 192 * must be atomic with respect to interrupts. 193 */ 194 #define __PCPU_INC(name) do { \ 195 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 196 sizeof(__pcpu_type(name)) == 2 || \ 197 sizeof(__pcpu_type(name)) == 4); \ 198 if (sizeof(__pcpu_type(name)) == 1) { \ 199 __asm __volatile("incb %%fs:%0" \ 200 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 201 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 202 } else if (sizeof(__pcpu_type(name)) == 2) { \ 203 __asm __volatile("incw %%fs:%0" \ 204 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 205 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 206 } else if (sizeof(__pcpu_type(name)) == 4) { \ 207 __asm __volatile("incl %%fs:%0" \ 208 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 209 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 210 } \ 211 } while (0) 212 213 /* 214 * Sets the value of the per-cpu variable name to value val. 215 */ 216 #define __PCPU_SET(name, val) do { \ 217 __pcpu_type(name) __val; \ 218 struct __s { \ 219 u_char __b[MIN(sizeof(__val), 4)]; \ 220 } __s; \ 221 \ 222 __val = (val); \ 223 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 224 sizeof(__val) == 4) { \ 225 __s = *(struct __s *)(void *)&__val; \ 226 __asm __volatile("mov %1,%%fs:%0" \ 227 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 228 : "r" (__s)); \ 229 } else { \ 230 *__PCPU_PTR(name) = __val; \ 231 } \ 232 } while (0) 233 234 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 235 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 236 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 237 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 238 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 239 240 #define OFFSETOF_CURTHREAD 0 241 #ifdef __clang__ 242 #pragma clang diagnostic push 243 #pragma clang diagnostic ignored "-Wnull-dereference" 244 #endif 245 static __inline __pure2 struct thread * 246 __curthread(void) 247 { 248 struct thread *td; 249 250 __asm("movl %%fs:%1,%0" : "=r" (td) 251 : "m" (*(char *)OFFSETOF_CURTHREAD)); 252 return (td); 253 } 254 #ifdef __clang__ 255 #pragma clang diagnostic pop 256 #endif 257 #define curthread (__curthread()) 258 259 #define OFFSETOF_CURPCB 16 260 static __inline __pure2 struct pcb * 261 __curpcb(void) 262 { 263 struct pcb *pcb; 264 265 __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 266 return (pcb); 267 } 268 #define curpcb (__curpcb()) 269 270 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 271 272 #error "this file needs to be ported to your compiler" 273 274 #endif /* lint, etc. */ 275 276 #endif /* _KERNEL */ 277 278 #endif /* !_MACHINE_PCPU_H_ */
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