pcpu.h revision 313862
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: stable/11/sys/i386/include/pcpu.h 313862 2017-02-17 07:08:37Z jah $ 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 char __pad[189] 72 73#ifdef _KERNEL 74 75#ifdef lint 76 77extern struct pcpu *pcpup; 78 79#define get_pcpu() (pcpup) 80#define PCPU_GET(member) (pcpup->pc_ ## member) 81#define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val)) 82#define PCPU_INC(member) PCPU_ADD(member, 1) 83#define PCPU_PTR(member) (&pcpup->pc_ ## member) 84#define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 85 86#elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 87 88/* 89 * Evaluates to the byte offset of the per-cpu variable name. 90 */ 91#define __pcpu_offset(name) \ 92 __offsetof(struct pcpu, name) 93 94/* 95 * Evaluates to the type of the per-cpu variable name. 96 */ 97#define __pcpu_type(name) \ 98 __typeof(((struct pcpu *)0)->name) 99 100/* 101 * Evaluates to the address of the per-cpu variable name. 102 */ 103#define __PCPU_PTR(name) __extension__ ({ \ 104 __pcpu_type(name) *__p; \ 105 \ 106 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \ 107 : "=r" (__p) \ 108 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 109 "i" (__pcpu_offset(name))); \ 110 \ 111 __p; \ 112}) 113 114/* 115 * Evaluates to the value of the per-cpu variable name. 116 */ 117#define __PCPU_GET(name) __extension__ ({ \ 118 __pcpu_type(name) __res; \ 119 struct __s { \ 120 u_char __b[MIN(sizeof(__res), 4)]; \ 121 } __s; \ 122 \ 123 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 124 sizeof(__res) == 4) { \ 125 __asm __volatile("mov %%fs:%1,%0" \ 126 : "=r" (__s) \ 127 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 128 *(struct __s *)(void *)&__res = __s; \ 129 } else { \ 130 __res = *__PCPU_PTR(name); \ 131 } \ 132 __res; \ 133}) 134 135/* 136 * Adds a value of the per-cpu counter name. The implementation 137 * must be atomic with respect to interrupts. 138 */ 139#define __PCPU_ADD(name, val) do { \ 140 __pcpu_type(name) __val; \ 141 struct __s { \ 142 u_char __b[MIN(sizeof(__val), 4)]; \ 143 } __s; \ 144 \ 145 __val = (val); \ 146 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 147 sizeof(__val) == 4) { \ 148 __s = *(struct __s *)(void *)&__val; \ 149 __asm __volatile("add %1,%%fs:%0" \ 150 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 151 : "r" (__s)); \ 152 } else \ 153 *__PCPU_PTR(name) += __val; \ 154} while (0) 155 156/* 157 * Increments the value of the per-cpu counter name. The implementation 158 * must be atomic with respect to interrupts. 159 */ 160#define __PCPU_INC(name) do { \ 161 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 162 sizeof(__pcpu_type(name)) == 2 || \ 163 sizeof(__pcpu_type(name)) == 4); \ 164 if (sizeof(__pcpu_type(name)) == 1) { \ 165 __asm __volatile("incb %%fs:%0" \ 166 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 167 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 168 } else if (sizeof(__pcpu_type(name)) == 2) { \ 169 __asm __volatile("incw %%fs:%0" \ 170 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 171 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 172 } else if (sizeof(__pcpu_type(name)) == 4) { \ 173 __asm __volatile("incl %%fs:%0" \ 174 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 175 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 176 } \ 177} while (0) 178 179/* 180 * Sets the value of the per-cpu variable name to value val. 181 */ 182#define __PCPU_SET(name, val) do { \ 183 __pcpu_type(name) __val; \ 184 struct __s { \ 185 u_char __b[MIN(sizeof(__val), 4)]; \ 186 } __s; \ 187 \ 188 __val = (val); \ 189 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 190 sizeof(__val) == 4) { \ 191 __s = *(struct __s *)(void *)&__val; \ 192 __asm __volatile("mov %1,%%fs:%0" \ 193 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 194 : "r" (__s)); \ 195 } else { \ 196 *__PCPU_PTR(name) = __val; \ 197 } \ 198} while (0) 199 200#define get_pcpu() __extension__ ({ \ 201 struct pcpu *__pc; \ 202 \ 203 __asm __volatile("movl %%fs:%1,%0" \ 204 : "=r" (__pc) \ 205 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace)))); \ 206 __pc; \ 207}) 208 209#define PCPU_GET(member) __PCPU_GET(pc_ ## member) 210#define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 211#define PCPU_INC(member) __PCPU_INC(pc_ ## member) 212#define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 213#define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 214 215#define OFFSETOF_CURTHREAD 0 216#ifdef __clang__ 217#pragma clang diagnostic push 218#pragma clang diagnostic ignored "-Wnull-dereference" 219#endif 220static __inline __pure2 struct thread * 221__curthread(void) 222{ 223 struct thread *td; 224 225 __asm("movl %%fs:%1,%0" : "=r" (td) 226 : "m" (*(char *)OFFSETOF_CURTHREAD)); 227 return (td); 228} 229#ifdef __clang__ 230#pragma clang diagnostic pop 231#endif 232#define curthread (__curthread()) 233 234#define OFFSETOF_CURPCB 16 235static __inline __pure2 struct pcb * 236__curpcb(void) 237{ 238 struct pcb *pcb; 239 240 __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 241 return (pcb); 242} 243#define curpcb (__curpcb()) 244 245#else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 246 247#error "this file needs to be ported to your compiler" 248 249#endif /* lint, etc. */ 250 251#endif /* _KERNEL */ 252 253#endif /* !_MACHINE_PCPU_H_ */ 254