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 char __pad[293] /* be divisor of PAGE_SIZE \ 82 after cache alignment */ 83 84 #ifdef _KERNEL 85 86 #ifdef lint 87 88 extern struct pcpu *pcpup; 89 90 #define PCPU_GET(member) (pcpup->pc_ ## member) 91 #define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val)) 92 #define PCPU_INC(member) PCPU_ADD(member, 1) 93 #define PCPU_PTR(member) (&pcpup->pc_ ## member) 94 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 95 96 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 97 98 /* 99 * Evaluates to the byte offset of the per-cpu variable name. 100 */ 101 #define __pcpu_offset(name) \ 102 __offsetof(struct pcpu, name) 103 104 /* 105 * Evaluates to the type of the per-cpu variable name. 106 */ 107 #define __pcpu_type(name) \ 108 __typeof(((struct pcpu *)0)->name) 109 110 /* 111 * Evaluates to the address of the per-cpu variable name. 112 */ 113 #define __PCPU_PTR(name) __extension__ ({ \ 114 __pcpu_type(name) *__p; \ 115 \ 116 __asm __volatile("movq %%gs:%1,%0; addq %2,%0" \ 117 : "=r" (__p) \ 118 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 119 "i" (__pcpu_offset(name))); \ 120 \ 121 __p; \ 122 }) 123 124 /* 125 * Evaluates to the value of the per-cpu variable name. 126 */ 127 #define __PCPU_GET(name) __extension__ ({ \ 128 __pcpu_type(name) __res; \ 129 struct __s { \ 130 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 131 } __s; \ 132 \ 133 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 134 sizeof(__res) == 4 || sizeof(__res) == 8) { \ 135 __asm __volatile("mov %%gs:%1,%0" \ 136 : "=r" (__s) \ 137 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 138 *(struct __s *)(void *)&__res = __s; \ 139 } else { \ 140 __res = *__PCPU_PTR(name); \ 141 } \ 142 __res; \ 143 }) 144 145 /* 146 * Adds the value to the per-cpu counter name. The implementation 147 * must be atomic with respect to interrupts. 148 */ 149 #define __PCPU_ADD(name, val) do { \ 150 __pcpu_type(name) __val; \ 151 struct __s { \ 152 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 153 } __s; \ 154 \ 155 __val = (val); \ 156 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 157 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 158 __s = *(struct __s *)(void *)&__val; \ 159 __asm __volatile("add %1,%%gs:%0" \ 160 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 161 : "r" (__s)); \ 162 } else \ 163 *__PCPU_PTR(name) += __val; \ 164 } while (0) 165 166 /* 167 * Increments the value of the per-cpu counter name. The implementation 168 * must be atomic with respect to interrupts. 169 */ 170 #define __PCPU_INC(name) do { \ 171 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 172 sizeof(__pcpu_type(name)) == 2 || \ 173 sizeof(__pcpu_type(name)) == 4 || \ 174 sizeof(__pcpu_type(name)) == 8); \ 175 if (sizeof(__pcpu_type(name)) == 1) { \ 176 __asm __volatile("incb %%gs:%0" \ 177 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 178 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 179 } else if (sizeof(__pcpu_type(name)) == 2) { \ 180 __asm __volatile("incw %%gs:%0" \ 181 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 182 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 183 } else if (sizeof(__pcpu_type(name)) == 4) { \ 184 __asm __volatile("incl %%gs:%0" \ 185 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 186 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 187 } else if (sizeof(__pcpu_type(name)) == 8) { \ 188 __asm __volatile("incq %%gs:%0" \ 189 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 190 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 191 } \ 192 } while (0) 193 194 /* 195 * Sets the value of the per-cpu variable name to value val. 196 */ 197 #define __PCPU_SET(name, val) { \ 198 __pcpu_type(name) __val; \ 199 struct __s { \ 200 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 201 } __s; \ 202 \ 203 __val = (val); \ 204 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 205 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 206 __s = *(struct __s *)(void *)&__val; \ 207 __asm __volatile("mov %1,%%gs:%0" \ 208 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 209 : "r" (__s)); \ 210 } else { \ 211 *__PCPU_PTR(name) = __val; \ 212 } \ 213 } 214 215 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 216 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 217 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 218 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 219 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 220 221 #define OFFSETOF_CURTHREAD 0 222 #ifdef __clang__ 223 #pragma clang diagnostic push 224 #pragma clang diagnostic ignored "-Wnull-dereference" 225 #endif 226 static __inline __pure2 struct thread * 227 __curthread(void) 228 { 229 struct thread *td; 230 231 __asm("movq %%gs:%1,%0" : "=r" (td) 232 : "m" (*(char *)OFFSETOF_CURTHREAD)); 233 return (td); 234 } 235 #ifdef __clang__ 236 #pragma clang diagnostic pop 237 #endif 238 #define curthread (__curthread()) 239 240 #define OFFSETOF_CURPCB 32 241 static __inline __pure2 struct pcb * 242 __curpcb(void) 243 { 244 struct pcb *pcb; 245 246 __asm("movq %%gs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 247 return (pcb); 248 } 249 #define curpcb (__curpcb()) 250 251 #define IS_BSP() (PCPU_GET(cpuid) == 0) 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