pcpu.h revision 307856
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 307856 2016-10-24 11:47:27Z kib $ 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#define PCPU_MD_FIELDS \ 48 char pc_monitorbuf[128] __aligned(128); /* cache line */ \ 49 struct pcpu *pc_prvspace; /* Self-reference */ \ 50 struct pmap *pc_curpmap; \ 51 struct i386tss pc_common_tss; \ 52 struct segment_descriptor pc_common_tssd; \ 53 struct segment_descriptor *pc_tss_gdt; \ 54 struct segment_descriptor *pc_fsgs_gdt; \ 55 int pc_currentldt; \ 56 u_int pc_acpi_id; /* ACPI CPU id */ \ 57 u_int pc_apic_id; \ 58 int pc_private_tss; /* Flag indicating private tss*/\ 59 u_int pc_cmci_mask; /* MCx banks for CMCI */ \ 60 u_int pc_vcpu_id; /* Xen vCPU ID */ \ 61 vm_offset_t pc_qmap_addr; /* KVA for temporary mappings */\ 62 uint32_t pc_smp_tlb_done; /* TLB op acknowledgement */ \ 63 char __pad[225] 64 65#ifdef _KERNEL 66 67#ifdef lint 68 69extern struct pcpu *pcpup; 70 71#define PCPU_GET(member) (pcpup->pc_ ## member) 72#define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val)) 73#define PCPU_INC(member) PCPU_ADD(member, 1) 74#define PCPU_PTR(member) (&pcpup->pc_ ## member) 75#define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 76 77#elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 78 79/* 80 * Evaluates to the byte offset of the per-cpu variable name. 81 */ 82#define __pcpu_offset(name) \ 83 __offsetof(struct pcpu, name) 84 85/* 86 * Evaluates to the type of the per-cpu variable name. 87 */ 88#define __pcpu_type(name) \ 89 __typeof(((struct pcpu *)0)->name) 90 91/* 92 * Evaluates to the address of the per-cpu variable name. 93 */ 94#define __PCPU_PTR(name) __extension__ ({ \ 95 __pcpu_type(name) *__p; \ 96 \ 97 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \ 98 : "=r" (__p) \ 99 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 100 "i" (__pcpu_offset(name))); \ 101 \ 102 __p; \ 103}) 104 105/* 106 * Evaluates to the value of the per-cpu variable name. 107 */ 108#define __PCPU_GET(name) __extension__ ({ \ 109 __pcpu_type(name) __res; \ 110 struct __s { \ 111 u_char __b[MIN(sizeof(__res), 4)]; \ 112 } __s; \ 113 \ 114 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 115 sizeof(__res) == 4) { \ 116 __asm __volatile("mov %%fs:%1,%0" \ 117 : "=r" (__s) \ 118 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 119 *(struct __s *)(void *)&__res = __s; \ 120 } else { \ 121 __res = *__PCPU_PTR(name); \ 122 } \ 123 __res; \ 124}) 125 126/* 127 * Adds a value of the per-cpu counter name. The implementation 128 * must be atomic with respect to interrupts. 129 */ 130#define __PCPU_ADD(name, val) do { \ 131 __pcpu_type(name) __val; \ 132 struct __s { \ 133 u_char __b[MIN(sizeof(__val), 4)]; \ 134 } __s; \ 135 \ 136 __val = (val); \ 137 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 138 sizeof(__val) == 4) { \ 139 __s = *(struct __s *)(void *)&__val; \ 140 __asm __volatile("add %1,%%fs:%0" \ 141 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 142 : "r" (__s)); \ 143 } else \ 144 *__PCPU_PTR(name) += __val; \ 145} while (0) 146 147/* 148 * Increments the value of the per-cpu counter name. The implementation 149 * must be atomic with respect to interrupts. 150 */ 151#define __PCPU_INC(name) do { \ 152 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 153 sizeof(__pcpu_type(name)) == 2 || \ 154 sizeof(__pcpu_type(name)) == 4); \ 155 if (sizeof(__pcpu_type(name)) == 1) { \ 156 __asm __volatile("incb %%fs:%0" \ 157 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 158 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 159 } else if (sizeof(__pcpu_type(name)) == 2) { \ 160 __asm __volatile("incw %%fs:%0" \ 161 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 162 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 163 } else if (sizeof(__pcpu_type(name)) == 4) { \ 164 __asm __volatile("incl %%fs:%0" \ 165 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 166 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 167 } \ 168} while (0) 169 170/* 171 * Sets the value of the per-cpu variable name to value val. 172 */ 173#define __PCPU_SET(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("mov %1,%%fs:%0" \ 184 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 185 : "r" (__s)); \ 186 } else { \ 187 *__PCPU_PTR(name) = __val; \ 188 } \ 189} while (0) 190 191#define PCPU_GET(member) __PCPU_GET(pc_ ## member) 192#define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 193#define PCPU_INC(member) __PCPU_INC(pc_ ## member) 194#define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 195#define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 196 197#define OFFSETOF_CURTHREAD 0 198#ifdef __clang__ 199#pragma clang diagnostic push 200#pragma clang diagnostic ignored "-Wnull-dereference" 201#endif 202static __inline __pure2 struct thread * 203__curthread(void) 204{ 205 struct thread *td; 206 207 __asm("movl %%fs:%1,%0" : "=r" (td) 208 : "m" (*(char *)OFFSETOF_CURTHREAD)); 209 return (td); 210} 211#ifdef __clang__ 212#pragma clang diagnostic pop 213#endif 214#define curthread (__curthread()) 215 216#define OFFSETOF_CURPCB 16 217static __inline __pure2 struct pcb * 218__curpcb(void) 219{ 220 struct pcb *pcb; 221 222 __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 223 return (pcb); 224} 225#define curpcb (__curpcb()) 226 227#else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 228 229#error "this file needs to be ported to your compiler" 230 231#endif /* lint, etc. */ 232 233#endif /* _KERNEL */ 234 235#endif /* !_MACHINE_PCPU_H_ */ 236