1 /*- 2 * Copyright (c) Peter Wemm <peter@netplex.com.au> 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 * $FreeBSD$ 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 /* 37 * The SMP parts are setup in pmap.c and locore.s for the BSP, and 38 * mp_machdep.c sets up the data for the AP's to "see" when they awake. 39 * The reason for doing it via a struct is so that an array of pointers 40 * to each CPU's data can be set up for things like "check curproc on all 41 * other processors" 42 */ 43 #define PCPU_MD_FIELDS \ 44 char pc_monitorbuf[128] __aligned(128); /* cache line */ \ 45 struct pcpu *pc_prvspace; /* Self-reference */ \ 46 struct pmap *pc_curpmap; \ 47 struct amd64tss *pc_tssp; /* TSS segment active on CPU */ \ 48 struct amd64tss *pc_commontssp;/* Common TSS for the CPU */ \ 49 register_t pc_rsp0; \ 50 register_t pc_scratch_rsp; /* User %rsp in syscall */ \ 51 u_int pc_apic_id; \ 52 u_int pc_acpi_id; /* ACPI CPU id */ \ 53 /* Pointer to the CPU %fs descriptor */ \ 54 struct user_segment_descriptor *pc_fs32p; \ 55 /* Pointer to the CPU %gs descriptor */ \ 56 struct user_segment_descriptor *pc_gs32p; \ 57 /* Pointer to the CPU LDT descriptor */ \ 58 struct system_segment_descriptor *pc_ldt; \ 59 /* Pointer to the CPU TSS descriptor */ \ 60 struct system_segment_descriptor *pc_tss; \ 61 uint64_t pc_pm_save_cnt; \ 62 u_int pc_cmci_mask; /* MCx banks for CMCI */ \ 63 uint64_t pc_dbreg[16]; /* ddb debugging regs */ \ 64 int pc_dbreg_cmd; /* ddb debugging reg cmd */ \ 65 char __pad[161] /* be divisor of PAGE_SIZE \ 66 after cache alignment */ 67 68 #define PC_DBREG_CMD_NONE 0 69 #define PC_DBREG_CMD_LOAD 1 70 71 #ifdef _KERNEL 72 73 #ifdef lint 74 75 extern struct pcpu *pcpup; 76 77 #define PCPU_GET(member) (pcpup->pc_ ## member) 78 #define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val)) 79 #define PCPU_INC(member) PCPU_ADD(member, 1) 80 #define PCPU_PTR(member) (&pcpup->pc_ ## member) 81 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 82 83 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 84 85 /* 86 * Evaluates to the byte offset of the per-cpu variable name. 87 */ 88 #define __pcpu_offset(name) \ 89 __offsetof(struct pcpu, name) 90 91 /* 92 * Evaluates to the type of the per-cpu variable name. 93 */ 94 #define __pcpu_type(name) \ 95 __typeof(((struct pcpu *)0)->name) 96 97 /* 98 * Evaluates to the address of the per-cpu variable name. 99 */ 100 #define __PCPU_PTR(name) __extension__ ({ \ 101 __pcpu_type(name) *__p; \ 102 \ 103 __asm __volatile("movq %%gs:%1,%0; addq %2,%0" \ 104 : "=r" (__p) \ 105 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 106 "i" (__pcpu_offset(name))); \ 107 \ 108 __p; \ 109 }) 110 111 /* 112 * Evaluates to the value of the per-cpu variable name. 113 */ 114 #define __PCPU_GET(name) __extension__ ({ \ 115 __pcpu_type(name) __res; \ 116 struct __s { \ 117 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 118 } __s; \ 119 \ 120 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 121 sizeof(__res) == 4 || sizeof(__res) == 8) { \ 122 __asm __volatile("mov %%gs:%1,%0" \ 123 : "=r" (__s) \ 124 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 125 *(struct __s *)(void *)&__res = __s; \ 126 } else { \ 127 __res = *__PCPU_PTR(name); \ 128 } \ 129 __res; \ 130 }) 131 132 /* 133 * Adds the value to the per-cpu counter name. The implementation 134 * must be atomic with respect to interrupts. 135 */ 136 #define __PCPU_ADD(name, val) do { \ 137 __pcpu_type(name) __val; \ 138 struct __s { \ 139 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 140 } __s; \ 141 \ 142 __val = (val); \ 143 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 144 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 145 __s = *(struct __s *)(void *)&__val; \ 146 __asm __volatile("add %1,%%gs:%0" \ 147 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 148 : "r" (__s)); \ 149 } else \ 150 *__PCPU_PTR(name) += __val; \ 151 } while (0) 152 153 /* 154 * Increments the value of the per-cpu counter name. The implementation 155 * must be atomic with respect to interrupts. 156 */ 157 #define __PCPU_INC(name) do { \ 158 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 159 sizeof(__pcpu_type(name)) == 2 || \ 160 sizeof(__pcpu_type(name)) == 4 || \ 161 sizeof(__pcpu_type(name)) == 8); \ 162 if (sizeof(__pcpu_type(name)) == 1) { \ 163 __asm __volatile("incb %%gs:%0" \ 164 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 165 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 166 } else if (sizeof(__pcpu_type(name)) == 2) { \ 167 __asm __volatile("incw %%gs:%0" \ 168 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 169 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 170 } else if (sizeof(__pcpu_type(name)) == 4) { \ 171 __asm __volatile("incl %%gs:%0" \ 172 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 173 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 174 } else if (sizeof(__pcpu_type(name)) == 8) { \ 175 __asm __volatile("incq %%gs:%0" \ 176 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 177 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 178 } \ 179 } while (0) 180 181 /* 182 * Sets the value of the per-cpu variable name to value val. 183 */ 184 #define __PCPU_SET(name, val) { \ 185 __pcpu_type(name) __val; \ 186 struct __s { \ 187 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 188 } __s; \ 189 \ 190 __val = (val); \ 191 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 192 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 193 __s = *(struct __s *)(void *)&__val; \ 194 __asm __volatile("mov %1,%%gs:%0" \ 195 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 196 : "r" (__s)); \ 197 } else { \ 198 *__PCPU_PTR(name) = __val; \ 199 } \ 200 } 201 202 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 203 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 204 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 205 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 206 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 207 208 #define OFFSETOF_CURTHREAD 0 209 #ifdef __clang__ 210 #pragma clang diagnostic push 211 #pragma clang diagnostic ignored "-Wnull-dereference" 212 #endif 213 static __inline __pure2 struct thread * 214 __curthread(void) 215 { 216 struct thread *td; 217 218 __asm("movq %%gs:%1,%0" : "=r" (td) 219 : "m" (*(char *)OFFSETOF_CURTHREAD)); 220 return (td); 221 } 222 #ifdef __clang__ 223 #pragma clang diagnostic pop 224 #endif 225 #define curthread (__curthread()) 226 227 #define OFFSETOF_CURPCB 32 228 static __inline __pure2 struct pcb * 229 __curpcb(void) 230 { 231 struct pcb *pcb; 232 233 __asm("movq %%gs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 234 return (pcb); 235 } 236 #define curpcb (__curpcb()) 237 238 #define IS_BSP() (PCPU_GET(cpuid) == 0) 239 240 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 241 242 #error "this file needs to be ported to your compiler" 243 244 #endif /* lint, etc. */ 245 246 #endif /* _KERNEL */ 247 248 #endif /* !_MACHINE_PCPU_H_ */ 249