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 82 #ifdef _KERNEL 83 84 #ifdef lint 85 86 extern struct pcpu *pcpup; 87 88 #define PCPU_GET(member) (pcpup->pc_ ## member) 89 #define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val)) 90 #define PCPU_INC(member) PCPU_ADD(member, 1) 91 #define PCPU_PTR(member) (&pcpup->pc_ ## member) 92 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 93 94 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 95 96 /* 97 * Evaluates to the byte offset of the per-cpu variable name. 98 */ 99 #define __pcpu_offset(name) \ 100 __offsetof(struct pcpu, name) 101 102 /* 103 * Evaluates to the type of the per-cpu variable name. 104 */ 105 #define __pcpu_type(name) \ 106 __typeof(((struct pcpu *)0)->name) 107 108 /* 109 * Evaluates to the address of the per-cpu variable name. 110 */ 111 #define __PCPU_PTR(name) __extension__ ({ \ 112 __pcpu_type(name) *__p; \ 113 \ 114 __asm __volatile("movq %%gs:%1,%0; addq %2,%0" \ 115 : "=r" (__p) \ 116 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 117 "i" (__pcpu_offset(name))); \ 118 \ 119 __p; \ 120 }) 121 122 /* 123 * Evaluates to the value of the per-cpu variable name. 124 */ 125 #define __PCPU_GET(name) __extension__ ({ \ 126 __pcpu_type(name) __res; \ 127 struct __s { \ 128 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 129 } __s; \ 130 \ 131 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 132 sizeof(__res) == 4 || sizeof(__res) == 8) { \ 133 __asm __volatile("mov %%gs:%1,%0" \ 134 : "=r" (__s) \ 135 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 136 *(struct __s *)(void *)&__res = __s; \ 137 } else { \ 138 __res = *__PCPU_PTR(name); \ 139 } \ 140 __res; \ 141 }) 142 143 /* 144 * Adds the value to the per-cpu counter name. The implementation 145 * must be atomic with respect to interrupts. 146 */ 147 #define __PCPU_ADD(name, val) do { \ 148 __pcpu_type(name) __val; \ 149 struct __s { \ 150 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 151 } __s; \ 152 \ 153 __val = (val); \ 154 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 155 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 156 __s = *(struct __s *)(void *)&__val; \ 157 __asm __volatile("add %1,%%gs:%0" \ 158 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 159 : "r" (__s)); \ 160 } else \ 161 *__PCPU_PTR(name) += __val; \ 162 } while (0) 163 164 /* 165 * Increments the value of the per-cpu counter name. The implementation 166 * must be atomic with respect to interrupts. 167 */ 168 #define __PCPU_INC(name) do { \ 169 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 170 sizeof(__pcpu_type(name)) == 2 || \ 171 sizeof(__pcpu_type(name)) == 4 || \ 172 sizeof(__pcpu_type(name)) == 8); \ 173 if (sizeof(__pcpu_type(name)) == 1) { \ 174 __asm __volatile("incb %%gs:%0" \ 175 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 176 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 177 } else if (sizeof(__pcpu_type(name)) == 2) { \ 178 __asm __volatile("incw %%gs:%0" \ 179 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 180 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 181 } else if (sizeof(__pcpu_type(name)) == 4) { \ 182 __asm __volatile("incl %%gs:%0" \ 183 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 184 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 185 } else if (sizeof(__pcpu_type(name)) == 8) { \ 186 __asm __volatile("incq %%gs:%0" \ 187 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 188 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 189 } \ 190 } while (0) 191 192 /* 193 * Sets the value of the per-cpu variable name to value val. 194 */ 195 #define __PCPU_SET(name, val) { \ 196 __pcpu_type(name) __val; \ 197 struct __s { \ 198 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 199 } __s; \ 200 \ 201 __val = (val); \ 202 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 203 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 204 __s = *(struct __s *)(void *)&__val; \ 205 __asm __volatile("mov %1,%%gs:%0" \ 206 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 207 : "r" (__s)); \ 208 } else { \ 209 *__PCPU_PTR(name) = __val; \ 210 } \ 211 } 212 213 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 214 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 215 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 216 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 217 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 218 219 #define OFFSETOF_CURTHREAD 0 220 #ifdef __clang__ 221 #pragma clang diagnostic push 222 #pragma clang diagnostic ignored "-Wnull-dereference" 223 #endif 224 static __inline __pure2 struct thread * 225 __curthread(void) 226 { 227 struct thread *td; 228 229 __asm("movq %%gs:%1,%0" : "=r" (td) 230 : "m" (*(char *)OFFSETOF_CURTHREAD)); 231 return (td); 232 } 233 #ifdef __clang__ 234 #pragma clang diagnostic pop 235 #endif 236 #define curthread (__curthread()) 237 238 #define OFFSETOF_CURPCB 32 239 static __inline __pure2 struct pcb * 240 __curpcb(void) 241 { 242 struct pcb *pcb; 243 244 __asm("movq %%gs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 245 return (pcb); 246 } 247 #define curpcb (__curpcb()) 248 249 #define IS_BSP() (PCPU_GET(cpuid) == 0) 250 251 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 252 253 #error "this file needs to be ported to your compiler" 254 255 #endif /* lint, etc. */ 256 257 #endif /* _KERNEL */ 258 259 #endif /* !_MACHINE_PCPU_H_ */ 260