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 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) Peter Wemm 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD: releng/12.0/sys/i386/include/pcpu.h 336047 2018-07-06 19:50:44Z kib $ 29 */ 30 31 #ifndef _MACHINE_PCPU_H_ 32 #define _MACHINE_PCPU_H_ 33 34 #ifndef _SYS_CDEFS_H_ 35 #error "sys/cdefs.h is a prerequisite for this file" 36 #endif 37 38 #include <machine/segments.h> 39 #include <machine/tss.h> 40 41 #include <sys/_lock.h> 42 #include <sys/_mutex.h> 43 44 /* 45 * The SMP parts are setup in pmap.c and machdep.c for the BSP, and 46 * pmap.c and mp_machdep.c sets up the data for the AP's to "see" when 47 * they awake. The reason for doing it via a struct is so that an 48 * array of pointers to each CPU's data can be set up for things like 49 * "check curproc on all other processors" 50 */ 51 52 #define PCPU_MD_FIELDS \ 53 char pc_monitorbuf[128] __aligned(128); /* cache line */ \ 54 struct pcpu *pc_prvspace; /* Self-reference */ \ 55 struct pmap *pc_curpmap; \ 56 struct segment_descriptor pc_common_tssd; \ 57 struct segment_descriptor *pc_tss_gdt; \ 58 struct segment_descriptor *pc_fsgs_gdt; \ 59 struct i386tss *pc_common_tssp; \ 60 u_int pc_kesp0; \ 61 u_int pc_trampstk; \ 62 int pc_currentldt; \ 63 u_int pc_acpi_id; /* ACPI CPU id */ \ 64 u_int pc_apic_id; \ 65 int pc_private_tss; /* Flag indicating private tss*/\ 66 u_int pc_cmci_mask; /* MCx banks for CMCI */ \ 67 u_int pc_vcpu_id; /* Xen vCPU ID */ \ 68 struct mtx pc_cmap_lock; \ 69 void *pc_cmap_pte1; \ 70 void *pc_cmap_pte2; \ 71 caddr_t pc_cmap_addr1; \ 72 caddr_t pc_cmap_addr2; \ 73 vm_offset_t pc_qmap_addr; /* KVA for temporary mappings */\ 74 vm_offset_t pc_copyout_maddr; \ 75 vm_offset_t pc_copyout_saddr; \ 76 struct mtx pc_copyout_mlock; \ 77 struct sx pc_copyout_slock; \ 78 char *pc_copyout_buf; \ 79 vm_offset_t pc_pmap_eh_va; \ 80 caddr_t pc_pmap_eh_ptep; \ 81 uint32_t pc_smp_tlb_done; /* TLB op acknowledgement */ \ 82 uint32_t pc_ibpb_set; \ 83 char __pad[3610] 84 85 #ifdef _KERNEL 86 87 #if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 88 89 /* 90 * Evaluates to the byte offset of the per-cpu variable name. 91 */ 92 #define __pcpu_offset(name) \ 93 __offsetof(struct pcpu, name) 94 95 /* 96 * Evaluates to the type of the per-cpu variable name. 97 */ 98 #define __pcpu_type(name) \ 99 __typeof(((struct pcpu *)0)->name) 100 101 /* 102 * Evaluates to the address of the per-cpu variable name. 103 */ 104 #define __PCPU_PTR(name) __extension__ ({ \ 105 __pcpu_type(name) *__p; \ 106 \ 107 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \ 108 : "=r" (__p) \ 109 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 110 "i" (__pcpu_offset(name))); \ 111 \ 112 __p; \ 113 }) 114 115 /* 116 * Evaluates to the value of the per-cpu variable name. 117 */ 118 #define __PCPU_GET(name) __extension__ ({ \ 119 __pcpu_type(name) __res; \ 120 struct __s { \ 121 u_char __b[MIN(sizeof(__res), 4)]; \ 122 } __s; \ 123 \ 124 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 125 sizeof(__res) == 4) { \ 126 __asm __volatile("mov %%fs:%1,%0" \ 127 : "=r" (__s) \ 128 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 129 *(struct __s *)(void *)&__res = __s; \ 130 } else { \ 131 __res = *__PCPU_PTR(name); \ 132 } \ 133 __res; \ 134 }) 135 136 /* 137 * Adds a value of the per-cpu counter name. The implementation 138 * must be atomic with respect to interrupts. 139 */ 140 #define __PCPU_ADD(name, val) do { \ 141 __pcpu_type(name) __val; \ 142 struct __s { \ 143 u_char __b[MIN(sizeof(__val), 4)]; \ 144 } __s; \ 145 \ 146 __val = (val); \ 147 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 148 sizeof(__val) == 4) { \ 149 __s = *(struct __s *)(void *)&__val; \ 150 __asm __volatile("add %1,%%fs:%0" \ 151 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 152 : "r" (__s)); \ 153 } else \ 154 *__PCPU_PTR(name) += __val; \ 155 } while (0) 156 157 /* 158 * Increments the value of the per-cpu counter name. The implementation 159 * must be atomic with respect to interrupts. 160 */ 161 #define __PCPU_INC(name) do { \ 162 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 163 sizeof(__pcpu_type(name)) == 2 || \ 164 sizeof(__pcpu_type(name)) == 4); \ 165 if (sizeof(__pcpu_type(name)) == 1) { \ 166 __asm __volatile("incb %%fs:%0" \ 167 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 168 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 169 } else if (sizeof(__pcpu_type(name)) == 2) { \ 170 __asm __volatile("incw %%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)) == 4) { \ 174 __asm __volatile("incl %%fs:%0" \ 175 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 176 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 177 } \ 178 } while (0) 179 180 /* 181 * Sets the value of the per-cpu variable name to value val. 182 */ 183 #define __PCPU_SET(name, val) do { \ 184 __pcpu_type(name) __val; \ 185 struct __s { \ 186 u_char __b[MIN(sizeof(__val), 4)]; \ 187 } __s; \ 188 \ 189 __val = (val); \ 190 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 191 sizeof(__val) == 4) { \ 192 __s = *(struct __s *)(void *)&__val; \ 193 __asm __volatile("mov %1,%%fs:%0" \ 194 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 195 : "r" (__s)); \ 196 } else { \ 197 *__PCPU_PTR(name) = __val; \ 198 } \ 199 } while (0) 200 201 #define get_pcpu() __extension__ ({ \ 202 struct pcpu *__pc; \ 203 \ 204 __asm __volatile("movl %%fs:%1,%0" \ 205 : "=r" (__pc) \ 206 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace)))); \ 207 __pc; \ 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 #define OFFSETOF_CURTHREAD 0 217 #ifdef __clang__ 218 #pragma clang diagnostic push 219 #pragma clang diagnostic ignored "-Wnull-dereference" 220 #endif 221 static __inline __pure2 struct thread * 222 __curthread(void) 223 { 224 struct thread *td; 225 226 __asm("movl %%fs:%1,%0" : "=r" (td) 227 : "m" (*(char *)OFFSETOF_CURTHREAD)); 228 return (td); 229 } 230 #ifdef __clang__ 231 #pragma clang diagnostic pop 232 #endif 233 #define curthread (__curthread()) 234 235 #define OFFSETOF_CURPCB 16 236 static __inline __pure2 struct pcb * 237 __curpcb(void) 238 { 239 struct pcb *pcb; 240 241 __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 242 return (pcb); 243 } 244 #define curpcb (__curpcb()) 245 246 #define IS_BSP() (PCPU_GET(cpuid) == 0) 247 248 #else /* defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 249 250 #error "this file needs to be ported to your compiler" 251 252 #endif /* __GNUCLIKE_ASM etc. */ 253 254 #endif /* _KERNEL */ 255 256 #endif /* !_MACHINE_PCPU_H_ */
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