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: releng/10.3/sys/i386/include/pcpu.h 256073 2013-10-05 23:11:01Z gibbs $ 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#if defined(XEN) 48 49/* These are peridically updated in shared_info, and then copied here. */ 50struct shadow_time_info { 51 uint64_t tsc_timestamp; /* TSC at last update of time vals. */ 52 uint64_t system_timestamp; /* Time, in nanosecs, since boot. */ 53 uint32_t tsc_to_nsec_mul; 54 uint32_t tsc_to_usec_mul; 55 int tsc_shift; 56 uint32_t version; 57}; 58 59#define PCPU_XEN_FIELDS \ 60 ; \ 61 u_int pc_cr3; /* track cr3 for R1/R3*/ \ 62 vm_paddr_t *pc_pdir_shadow; \ 63 uint64_t pc_processed_system_time; \ 64 struct shadow_time_info pc_shadow_time; \ 65 char __pad[185] 66 67#else /* !XEN */ 68 69#define PCPU_XEN_FIELDS \ 70 ; \ 71 char __pad[233] 72 73#endif 74 75#define PCPU_MD_FIELDS \ 76 char pc_monitorbuf[128] __aligned(128); /* cache line */ \ 77 struct pcpu *pc_prvspace; /* Self-reference */ \ 78 struct pmap *pc_curpmap; \ 79 struct i386tss pc_common_tss; \ 80 struct segment_descriptor pc_common_tssd; \ 81 struct segment_descriptor *pc_tss_gdt; \ 82 struct segment_descriptor *pc_fsgs_gdt; \ 83 int pc_currentldt; \ 84 u_int pc_acpi_id; /* ACPI CPU id */ \ 85 u_int pc_apic_id; \ 86 int pc_private_tss; /* Flag indicating private tss*/\ 87 u_int pc_cmci_mask; /* MCx banks for CMCI */ \ 88 u_int pc_vcpu_id /* Xen vCPU ID */ \ 89 PCPU_XEN_FIELDS 90 91#ifdef _KERNEL 92 93#ifdef lint 94 95extern struct pcpu *pcpup; 96 97#define PCPU_GET(member) (pcpup->pc_ ## member) 98#define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val)) 99#define PCPU_INC(member) PCPU_ADD(member, 1) 100#define PCPU_PTR(member) (&pcpup->pc_ ## member) 101#define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 102 103#elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 104 105/* 106 * Evaluates to the byte offset of the per-cpu variable name. 107 */ 108#define __pcpu_offset(name) \ 109 __offsetof(struct pcpu, name) 110 111/* 112 * Evaluates to the type of the per-cpu variable name. 113 */ 114#define __pcpu_type(name) \ 115 __typeof(((struct pcpu *)0)->name) 116 117/* 118 * Evaluates to the address of the per-cpu variable name. 119 */ 120#define __PCPU_PTR(name) __extension__ ({ \ 121 __pcpu_type(name) *__p; \ 122 \ 123 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \ 124 : "=r" (__p) \ 125 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 126 "i" (__pcpu_offset(name))); \ 127 \ 128 __p; \ 129}) 130 131/* 132 * Evaluates to the value of the per-cpu variable name. 133 */ 134#define __PCPU_GET(name) __extension__ ({ \ 135 __pcpu_type(name) __res; \ 136 struct __s { \ 137 u_char __b[MIN(sizeof(__res), 4)]; \ 138 } __s; \ 139 \ 140 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 141 sizeof(__res) == 4) { \ 142 __asm __volatile("mov %%fs:%1,%0" \ 143 : "=r" (__s) \ 144 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 145 *(struct __s *)(void *)&__res = __s; \ 146 } else { \ 147 __res = *__PCPU_PTR(name); \ 148 } \ 149 __res; \ 150}) 151 152/* 153 * Adds a value of the per-cpu counter name. The implementation 154 * must be atomic with respect to interrupts. 155 */ 156#define __PCPU_ADD(name, val) do { \ 157 __pcpu_type(name) __val; \ 158 struct __s { \ 159 u_char __b[MIN(sizeof(__val), 4)]; \ 160 } __s; \ 161 \ 162 __val = (val); \ 163 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 164 sizeof(__val) == 4) { \ 165 __s = *(struct __s *)(void *)&__val; \ 166 __asm __volatile("add %1,%%fs:%0" \ 167 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 168 : "r" (__s)); \ 169 } else \ 170 *__PCPU_PTR(name) += __val; \ 171} while (0) 172 173/* 174 * Increments the value of the per-cpu counter name. The implementation 175 * must be atomic with respect to interrupts. 176 */ 177#define __PCPU_INC(name) do { \ 178 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 179 sizeof(__pcpu_type(name)) == 2 || \ 180 sizeof(__pcpu_type(name)) == 4); \ 181 if (sizeof(__pcpu_type(name)) == 1) { \ 182 __asm __volatile("incb %%fs:%0" \ 183 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 184 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 185 } else if (sizeof(__pcpu_type(name)) == 2) { \ 186 __asm __volatile("incw %%fs:%0" \ 187 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 188 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 189 } else if (sizeof(__pcpu_type(name)) == 4) { \ 190 __asm __volatile("incl %%fs:%0" \ 191 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 192 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 193 } \ 194} while (0) 195 196/* 197 * Sets the value of the per-cpu variable name to value val. 198 */ 199#define __PCPU_SET(name, val) do { \ 200 __pcpu_type(name) __val; \ 201 struct __s { \ 202 u_char __b[MIN(sizeof(__val), 4)]; \ 203 } __s; \ 204 \ 205 __val = (val); \ 206 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 207 sizeof(__val) == 4) { \ 208 __s = *(struct __s *)(void *)&__val; \ 209 __asm __volatile("mov %1,%%fs:%0" \ 210 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 211 : "r" (__s)); \ 212 } else { \ 213 *__PCPU_PTR(name) = __val; \ 214 } \ 215} while (0) 216 217#define PCPU_GET(member) __PCPU_GET(pc_ ## member) 218#define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 219#define PCPU_INC(member) __PCPU_INC(pc_ ## member) 220#define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 221#define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 222 223#define OFFSETOF_CURTHREAD 0 224#ifdef __clang__ 225#pragma clang diagnostic push 226#pragma clang diagnostic ignored "-Wnull-dereference" 227#endif 228static __inline __pure2 struct thread * 229__curthread(void) 230{ 231 struct thread *td; 232 233 __asm("movl %%fs:%1,%0" : "=r" (td) 234 : "m" (*(char *)OFFSETOF_CURTHREAD)); 235 return (td); 236} 237#ifdef __clang__ 238#pragma clang diagnostic pop 239#endif 240#define curthread (__curthread()) 241 242#define OFFSETOF_CURPCB 16 243static __inline __pure2 struct pcb * 244__curpcb(void) 245{ 246 struct pcb *pcb; 247 248 __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 249 return (pcb); 250} 251#define curpcb (__curpcb()) 252 253#else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 254 255#error "this file needs to be ported to your compiler" 256 257#endif /* lint, etc. */ 258 259#endif /* _KERNEL */ 260 261#endif /* !_MACHINE_PCPU_H_ */ 262