pcpu.h revision 311653
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 311653 2017-01-07 18:54:57Z 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 PCPU_GET(member) (pcpup->pc_ ## member) 80#define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val)) 81#define PCPU_INC(member) PCPU_ADD(member, 1) 82#define PCPU_PTR(member) (&pcpup->pc_ ## member) 83#define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 84 85#elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 86 87/* 88 * Evaluates to the byte offset of the per-cpu variable name. 89 */ 90#define __pcpu_offset(name) \ 91 __offsetof(struct pcpu, name) 92 93/* 94 * Evaluates to the type of the per-cpu variable name. 95 */ 96#define __pcpu_type(name) \ 97 __typeof(((struct pcpu *)0)->name) 98 99/* 100 * Evaluates to the address of the per-cpu variable name. 101 */ 102#define __PCPU_PTR(name) __extension__ ({ \ 103 __pcpu_type(name) *__p; \ 104 \ 105 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \ 106 : "=r" (__p) \ 107 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 108 "i" (__pcpu_offset(name))); \ 109 \ 110 __p; \ 111}) 112 113/* 114 * Evaluates to the value of the per-cpu variable name. 115 */ 116#define __PCPU_GET(name) __extension__ ({ \ 117 __pcpu_type(name) __res; \ 118 struct __s { \ 119 u_char __b[MIN(sizeof(__res), 4)]; \ 120 } __s; \ 121 \ 122 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 123 sizeof(__res) == 4) { \ 124 __asm __volatile("mov %%fs:%1,%0" \ 125 : "=r" (__s) \ 126 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 127 *(struct __s *)(void *)&__res = __s; \ 128 } else { \ 129 __res = *__PCPU_PTR(name); \ 130 } \ 131 __res; \ 132}) 133 134/* 135 * Adds a value of the per-cpu counter name. The implementation 136 * must be atomic with respect to interrupts. 137 */ 138#define __PCPU_ADD(name, val) do { \ 139 __pcpu_type(name) __val; \ 140 struct __s { \ 141 u_char __b[MIN(sizeof(__val), 4)]; \ 142 } __s; \ 143 \ 144 __val = (val); \ 145 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 146 sizeof(__val) == 4) { \ 147 __s = *(struct __s *)(void *)&__val; \ 148 __asm __volatile("add %1,%%fs:%0" \ 149 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 150 : "r" (__s)); \ 151 } else \ 152 *__PCPU_PTR(name) += __val; \ 153} while (0) 154 155/* 156 * Increments the value of the per-cpu counter name. The implementation 157 * must be atomic with respect to interrupts. 158 */ 159#define __PCPU_INC(name) do { \ 160 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 161 sizeof(__pcpu_type(name)) == 2 || \ 162 sizeof(__pcpu_type(name)) == 4); \ 163 if (sizeof(__pcpu_type(name)) == 1) { \ 164 __asm __volatile("incb %%fs:%0" \ 165 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 166 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 167 } else if (sizeof(__pcpu_type(name)) == 2) { \ 168 __asm __volatile("incw %%fs:%0" \ 169 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 170 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 171 } else if (sizeof(__pcpu_type(name)) == 4) { \ 172 __asm __volatile("incl %%fs:%0" \ 173 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 174 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 175 } \ 176} while (0) 177 178/* 179 * Sets the value of the per-cpu variable name to value val. 180 */ 181#define __PCPU_SET(name, val) do { \ 182 __pcpu_type(name) __val; \ 183 struct __s { \ 184 u_char __b[MIN(sizeof(__val), 4)]; \ 185 } __s; \ 186 \ 187 __val = (val); \ 188 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 189 sizeof(__val) == 4) { \ 190 __s = *(struct __s *)(void *)&__val; \ 191 __asm __volatile("mov %1,%%fs:%0" \ 192 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 193 : "r" (__s)); \ 194 } else { \ 195 *__PCPU_PTR(name) = __val; \ 196 } \ 197} while (0) 198 199#define PCPU_GET(member) __PCPU_GET(pc_ ## member) 200#define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 201#define PCPU_INC(member) __PCPU_INC(pc_ ## member) 202#define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 203#define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 204 205#define OFFSETOF_CURTHREAD 0 206#ifdef __clang__ 207#pragma clang diagnostic push 208#pragma clang diagnostic ignored "-Wnull-dereference" 209#endif 210static __inline __pure2 struct thread * 211__curthread(void) 212{ 213 struct thread *td; 214 215 __asm("movl %%fs:%1,%0" : "=r" (td) 216 : "m" (*(char *)OFFSETOF_CURTHREAD)); 217 return (td); 218} 219#ifdef __clang__ 220#pragma clang diagnostic pop 221#endif 222#define curthread (__curthread()) 223 224#define OFFSETOF_CURPCB 16 225static __inline __pure2 struct pcb * 226__curpcb(void) 227{ 228 struct pcb *pcb; 229 230 __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 231 return (pcb); 232} 233#define curpcb (__curpcb()) 234 235#else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 236 237#error "this file needs to be ported to your compiler" 238 239#endif /* lint, etc. */ 240 241#endif /* _KERNEL */ 242 243#endif /* !_MACHINE_PCPU_H_ */ 244