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 #if defined(XEN) || defined(XENHVM) 37 #ifndef NR_VIRQS 38 #define NR_VIRQS 24 39 #endif 40 #ifndef NR_IPIS 41 #define NR_IPIS 2 42 #endif 43 #endif 44 45 #ifdef XENHVM 46 #define PCPU_XEN_FIELDS \ 47 ; \ 48 unsigned int pc_last_processed_l1i; \ 49 unsigned int pc_last_processed_l2i 50 #else 51 #define PCPU_XEN_FIELDS 52 #endif 53 54 /* 55 * The SMP parts are setup in pmap.c and locore.s for the BSP, and 56 * mp_machdep.c sets up the data for the AP's to "see" when they awake. 57 * The reason for doing it via a struct is so that an array of pointers 58 * to each CPU's data can be set up for things like "check curproc on all 59 * other processors" 60 */ 61 #define PCPU_MD_FIELDS \ 62 char pc_monitorbuf[128] __aligned(128); /* cache line */ \ 63 struct pcpu *pc_prvspace; /* Self-reference */ \ 64 struct pmap *pc_curpmap; \ 65 struct amd64tss *pc_tssp; /* TSS segment active on CPU */ \ 66 struct amd64tss *pc_commontssp;/* Common TSS for the CPU */ \ 67 register_t pc_rsp0; \ 68 register_t pc_scratch_rsp; /* User %rsp in syscall */ \ 69 u_int pc_apic_id; \ 70 u_int pc_acpi_id; /* ACPI CPU id */ \ 71 /* Pointer to the CPU %fs descriptor */ \ 72 struct user_segment_descriptor *pc_fs32p; \ 73 /* Pointer to the CPU %gs descriptor */ \ 74 struct user_segment_descriptor *pc_gs32p; \ 75 /* Pointer to the CPU LDT descriptor */ \ 76 struct system_segment_descriptor *pc_ldt; \ 77 /* Pointer to the CPU TSS descriptor */ \ 78 struct system_segment_descriptor *pc_tss; \ 79 u_int pc_cmci_mask /* MCx banks for CMCI */ \ 80 PCPU_XEN_FIELDS; \ 81 uint64_t pc_dbreg[16]; /* ddb debugging regs */ \ 82 int pc_dbreg_cmd; /* ddb debugging reg cmd */ \ 83 char __pad[161] /* be divisor of PAGE_SIZE \ 84 after cache alignment */ 85 86 #define PC_DBREG_CMD_NONE 0 87 #define PC_DBREG_CMD_LOAD 1 88 89 #ifdef _KERNEL 90 91 #ifdef lint 92 93 extern struct pcpu *pcpup; 94 95 #define PCPU_GET(member) (pcpup->pc_ ## member) 96 #define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val)) 97 #define PCPU_INC(member) PCPU_ADD(member, 1) 98 #define PCPU_PTR(member) (&pcpup->pc_ ## member) 99 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 100 101 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 102 103 /* 104 * Evaluates to the byte offset of the per-cpu variable name. 105 */ 106 #define __pcpu_offset(name) \ 107 __offsetof(struct pcpu, name) 108 109 /* 110 * Evaluates to the type of the per-cpu variable name. 111 */ 112 #define __pcpu_type(name) \ 113 __typeof(((struct pcpu *)0)->name) 114 115 /* 116 * Evaluates to the address of the per-cpu variable name. 117 */ 118 #define __PCPU_PTR(name) __extension__ ({ \ 119 __pcpu_type(name) *__p; \ 120 \ 121 __asm __volatile("movq %%gs:%1,%0; addq %2,%0" \ 122 : "=r" (__p) \ 123 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 124 "i" (__pcpu_offset(name))); \ 125 \ 126 __p; \ 127 }) 128 129 /* 130 * Evaluates to the value of the per-cpu variable name. 131 */ 132 #define __PCPU_GET(name) __extension__ ({ \ 133 __pcpu_type(name) __res; \ 134 struct __s { \ 135 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 136 } __s; \ 137 \ 138 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 139 sizeof(__res) == 4 || sizeof(__res) == 8) { \ 140 __asm __volatile("mov %%gs:%1,%0" \ 141 : "=r" (__s) \ 142 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 143 *(struct __s *)(void *)&__res = __s; \ 144 } else { \ 145 __res = *__PCPU_PTR(name); \ 146 } \ 147 __res; \ 148 }) 149 150 /* 151 * Adds the value to the per-cpu counter name. The implementation 152 * must be atomic with respect to interrupts. 153 */ 154 #define __PCPU_ADD(name, val) do { \ 155 __pcpu_type(name) __val; \ 156 struct __s { \ 157 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 158 } __s; \ 159 \ 160 __val = (val); \ 161 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 162 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 163 __s = *(struct __s *)(void *)&__val; \ 164 __asm __volatile("add %1,%%gs:%0" \ 165 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 166 : "r" (__s)); \ 167 } else \ 168 *__PCPU_PTR(name) += __val; \ 169 } while (0) 170 171 /* 172 * Increments the value of the per-cpu counter name. The implementation 173 * must be atomic with respect to interrupts. 174 */ 175 #define __PCPU_INC(name) do { \ 176 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 177 sizeof(__pcpu_type(name)) == 2 || \ 178 sizeof(__pcpu_type(name)) == 4 || \ 179 sizeof(__pcpu_type(name)) == 8); \ 180 if (sizeof(__pcpu_type(name)) == 1) { \ 181 __asm __volatile("incb %%gs:%0" \ 182 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 183 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 184 } else if (sizeof(__pcpu_type(name)) == 2) { \ 185 __asm __volatile("incw %%gs:%0" \ 186 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 187 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 188 } else if (sizeof(__pcpu_type(name)) == 4) { \ 189 __asm __volatile("incl %%gs:%0" \ 190 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 191 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 192 } else if (sizeof(__pcpu_type(name)) == 8) { \ 193 __asm __volatile("incq %%gs:%0" \ 194 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 195 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 196 } \ 197 } while (0) 198 199 /* 200 * Sets the value of the per-cpu variable name to value val. 201 */ 202 #define __PCPU_SET(name, val) { \ 203 __pcpu_type(name) __val; \ 204 struct __s { \ 205 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 206 } __s; \ 207 \ 208 __val = (val); \ 209 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 210 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 211 __s = *(struct __s *)(void *)&__val; \ 212 __asm __volatile("mov %1,%%gs:%0" \ 213 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 214 : "r" (__s)); \ 215 } else { \ 216 *__PCPU_PTR(name) = __val; \ 217 } \ 218 } 219 220 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 221 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 222 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 223 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 224 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 225 226 #define OFFSETOF_CURTHREAD 0 227 #ifdef __clang__ 228 #pragma clang diagnostic push 229 #pragma clang diagnostic ignored "-Wnull-dereference" 230 #endif 231 static __inline __pure2 struct thread * 232 __curthread(void) 233 { 234 struct thread *td; 235 236 __asm("movq %%gs:%1,%0" : "=r" (td) 237 : "m" (*(char *)OFFSETOF_CURTHREAD)); 238 return (td); 239 } 240 #ifdef __clang__ 241 #pragma clang diagnostic pop 242 #endif 243 #define curthread (__curthread()) 244 245 #define OFFSETOF_CURPCB 32 246 static __inline __pure2 struct pcb * 247 __curpcb(void) 248 { 249 struct pcb *pcb; 250 251 __asm("movq %%gs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 252 return (pcb); 253 } 254 #define curpcb (__curpcb()) 255 256 #define IS_BSP() (PCPU_GET(cpuid) == 0) 257 258 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 259 260 #error "this file needs to be ported to your compiler" 261 262 #endif /* lint, etc. */ 263 264 #endif /* _KERNEL */ 265 266 #endif /* !_MACHINE_PCPU_H_ */ 267