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 * $FreeBSD$ 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 #include <sys/_lock.h> 40 #include <sys/_mutex.h> 41 42 /* 43 * The SMP parts are setup in pmap.c and locore.s for the BSP, and 44 * mp_machdep.c sets up the data for the AP's to "see" when they awake. 45 * The reason for doing it via a struct is so that an array of pointers 46 * to each CPU's data can be set up for things like "check curproc on all 47 * other processors" 48 */ 49 50 #define PCPU_MD_FIELDS \ 51 char pc_monitorbuf[128] __aligned(128); /* cache line */ \ 52 struct pcpu *pc_prvspace; /* Self-reference */ \ 53 struct pmap *pc_curpmap; \ 54 struct i386tss pc_common_tss; \ 55 struct segment_descriptor pc_common_tssd; \ 56 struct segment_descriptor *pc_tss_gdt; \ 57 struct segment_descriptor *pc_fsgs_gdt; \ 58 int pc_currentldt; \ 59 u_int pc_acpi_id; /* ACPI CPU id */ \ 60 u_int pc_apic_id; \ 61 int pc_private_tss; /* Flag indicating private tss*/\ 62 u_int pc_cmci_mask; /* MCx banks for CMCI */ \ 63 u_int pc_vcpu_id; /* Xen vCPU ID */ \ 64 struct mtx pc_cmap_lock; \ 65 void *pc_cmap_pte1; \ 66 void *pc_cmap_pte2; \ 67 caddr_t pc_cmap_addr1; \ 68 caddr_t pc_cmap_addr2; \ 69 vm_offset_t pc_qmap_addr; /* KVA for temporary mappings */\ 70 uint32_t pc_smp_tlb_done; /* TLB op acknowledgement */ \ 71 uint32_t pc_ibpb_set; \ 72 void *pc_mds_buf; \ 73 void *pc_mds_buf64; \ 74 uint32_t pc_pad[12]; \ 75 uint8_t pc_mds_tmp[64]; \ 76 char __pad[153] 77 78 #ifdef _KERNEL 79 80 #ifdef lint 81 82 extern struct pcpu *pcpup; 83 84 #define get_pcpu() (pcpup) 85 #define PCPU_GET(member) (pcpup->pc_ ## member) 86 #define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val)) 87 #define PCPU_INC(member) PCPU_ADD(member, 1) 88 #define PCPU_PTR(member) (&pcpup->pc_ ## member) 89 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 90 91 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 92 93 /* 94 * Evaluates to the byte offset of the per-cpu variable name. 95 */ 96 #define __pcpu_offset(name) \ 97 __offsetof(struct pcpu, name) 98 99 /* 100 * Evaluates to the type of the per-cpu variable name. 101 */ 102 #define __pcpu_type(name) \ 103 __typeof(((struct pcpu *)0)->name) 104 105 /* 106 * Evaluates to the address of the per-cpu variable name. 107 */ 108 #define __PCPU_PTR(name) __extension__ ({ \ 109 __pcpu_type(name) *__p; \ 110 \ 111 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \ 112 : "=r" (__p) \ 113 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 114 "i" (__pcpu_offset(name))); \ 115 \ 116 __p; \ 117 }) 118 119 /* 120 * Evaluates to the value of the per-cpu variable name. 121 */ 122 #define __PCPU_GET(name) __extension__ ({ \ 123 __pcpu_type(name) __res; \ 124 struct __s { \ 125 u_char __b[MIN(sizeof(__res), 4)]; \ 126 } __s; \ 127 \ 128 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 129 sizeof(__res) == 4) { \ 130 __asm __volatile("mov %%fs:%1,%0" \ 131 : "=r" (__s) \ 132 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 133 *(struct __s *)(void *)&__res = __s; \ 134 } else { \ 135 __res = *__PCPU_PTR(name); \ 136 } \ 137 __res; \ 138 }) 139 140 /* 141 * Adds a value of the per-cpu counter name. The implementation 142 * must be atomic with respect to interrupts. 143 */ 144 #define __PCPU_ADD(name, val) do { \ 145 __pcpu_type(name) __val; \ 146 struct __s { \ 147 u_char __b[MIN(sizeof(__val), 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("add %1,%%fs:%0" \ 155 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 156 : "r" (__s)); \ 157 } else \ 158 *__PCPU_PTR(name) += __val; \ 159 } while (0) 160 161 /* 162 * Increments the value of the per-cpu counter name. The implementation 163 * must be atomic with respect to interrupts. 164 */ 165 #define __PCPU_INC(name) do { \ 166 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 167 sizeof(__pcpu_type(name)) == 2 || \ 168 sizeof(__pcpu_type(name)) == 4); \ 169 if (sizeof(__pcpu_type(name)) == 1) { \ 170 __asm __volatile("incb %%fs:%0" \ 171 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 172 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 173 } else if (sizeof(__pcpu_type(name)) == 2) { \ 174 __asm __volatile("incw %%fs:%0" \ 175 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 176 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 177 } else if (sizeof(__pcpu_type(name)) == 4) { \ 178 __asm __volatile("incl %%fs:%0" \ 179 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 180 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 181 } \ 182 } while (0) 183 184 /* 185 * Sets the value of the per-cpu variable name to value val. 186 */ 187 #define __PCPU_SET(name, val) do { \ 188 __pcpu_type(name) __val; \ 189 struct __s { \ 190 u_char __b[MIN(sizeof(__val), 4)]; \ 191 } __s; \ 192 \ 193 __val = (val); \ 194 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 195 sizeof(__val) == 4) { \ 196 __s = *(struct __s *)(void *)&__val; \ 197 __asm __volatile("mov %1,%%fs:%0" \ 198 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 199 : "r" (__s)); \ 200 } else { \ 201 *__PCPU_PTR(name) = __val; \ 202 } \ 203 } while (0) 204 205 #define get_pcpu() __extension__ ({ \ 206 struct pcpu *__pc; \ 207 \ 208 __asm __volatile("movl %%fs:%1,%0" \ 209 : "=r" (__pc) \ 210 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace)))); \ 211 __pc; \ 212 }) 213 214 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 215 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 216 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 217 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 218 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 219 220 #define OFFSETOF_CURTHREAD 0 221 #ifdef __clang__ 222 #pragma clang diagnostic push 223 #pragma clang diagnostic ignored "-Wnull-dereference" 224 #endif 225 static __inline __pure2 struct thread * 226 __curthread(void) 227 { 228 struct thread *td; 229 230 __asm("movl %%fs:%1,%0" : "=r" (td) 231 : "m" (*(char *)OFFSETOF_CURTHREAD)); 232 return (td); 233 } 234 #ifdef __clang__ 235 #pragma clang diagnostic pop 236 #endif 237 #define curthread (__curthread()) 238 239 #define OFFSETOF_CURPCB 16 240 static __inline __pure2 struct pcb * 241 __curpcb(void) 242 { 243 struct pcb *pcb; 244 245 __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 246 return (pcb); 247 } 248 #define curpcb (__curpcb()) 249 250 #define IS_BSP() (PCPU_GET(cpuid) == 0) 251 252 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 253 254 #error "this file needs to be ported to your compiler" 255 256 #endif /* lint, etc. */ 257 258 #endif /* _KERNEL */ 259 260 #endif /* !_MACHINE_PCPU_H_ */
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