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 u_int pc_vcpu_id; /* Xen vCPU ID */ \ 66 uint32_t pc_pcid_next; \ 67 uint32_t pc_pcid_gen; \ 68 uint32_t pc_smp_tlb_done; /* TLB op acknowledgement */ \ 69 char __pad[384] /* be divisor of PAGE_SIZE \ 70 after cache alignment */ 71 72 #define PC_DBREG_CMD_NONE 0 73 #define PC_DBREG_CMD_LOAD 1 74 75 #ifdef _KERNEL 76 77 #ifdef lint 78 79 extern struct pcpu *pcpup; 80 81 #define get_pcpu() (pcpup) 82 #define PCPU_GET(member) (pcpup->pc_ ## member) 83 #define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val)) 84 #define PCPU_INC(member) PCPU_ADD(member, 1) 85 #define PCPU_PTR(member) (&pcpup->pc_ ## member) 86 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 87 88 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 89 90 /* 91 * Evaluates to the byte offset of the per-cpu variable name. 92 */ 93 #define __pcpu_offset(name) \ 94 __offsetof(struct pcpu, name) 95 96 /* 97 * Evaluates to the type of the per-cpu variable name. 98 */ 99 #define __pcpu_type(name) \ 100 __typeof(((struct pcpu *)0)->name) 101 102 /* 103 * Evaluates to the address of the per-cpu variable name. 104 */ 105 #define __PCPU_PTR(name) __extension__ ({ \ 106 __pcpu_type(name) *__p; \ 107 \ 108 __asm __volatile("movq %%gs:%1,%0; addq %2,%0" \ 109 : "=r" (__p) \ 110 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 111 "i" (__pcpu_offset(name))); \ 112 \ 113 __p; \ 114 }) 115 116 /* 117 * Evaluates to the value of the per-cpu variable name. 118 */ 119 #define __PCPU_GET(name) __extension__ ({ \ 120 __pcpu_type(name) __res; \ 121 struct __s { \ 122 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 123 } __s; \ 124 \ 125 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 126 sizeof(__res) == 4 || sizeof(__res) == 8) { \ 127 __asm __volatile("mov %%gs:%1,%0" \ 128 : "=r" (__s) \ 129 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 130 *(struct __s *)(void *)&__res = __s; \ 131 } else { \ 132 __res = *__PCPU_PTR(name); \ 133 } \ 134 __res; \ 135 }) 136 137 /* 138 * Adds the value to the per-cpu counter name. The implementation 139 * must be atomic with respect to interrupts. 140 */ 141 #define __PCPU_ADD(name, val) do { \ 142 __pcpu_type(name) __val; \ 143 struct __s { \ 144 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 145 } __s; \ 146 \ 147 __val = (val); \ 148 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 149 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 150 __s = *(struct __s *)(void *)&__val; \ 151 __asm __volatile("add %1,%%gs:%0" \ 152 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 153 : "r" (__s)); \ 154 } else \ 155 *__PCPU_PTR(name) += __val; \ 156 } while (0) 157 158 /* 159 * Increments the value of the per-cpu counter name. The implementation 160 * must be atomic with respect to interrupts. 161 */ 162 #define __PCPU_INC(name) do { \ 163 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 164 sizeof(__pcpu_type(name)) == 2 || \ 165 sizeof(__pcpu_type(name)) == 4 || \ 166 sizeof(__pcpu_type(name)) == 8); \ 167 if (sizeof(__pcpu_type(name)) == 1) { \ 168 __asm __volatile("incb %%gs:%0" \ 169 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 170 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 171 } else if (sizeof(__pcpu_type(name)) == 2) { \ 172 __asm __volatile("incw %%gs:%0" \ 173 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 174 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 175 } else if (sizeof(__pcpu_type(name)) == 4) { \ 176 __asm __volatile("incl %%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)) == 8) { \ 180 __asm __volatile("incq %%gs:%0" \ 181 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 182 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 183 } \ 184 } while (0) 185 186 /* 187 * Sets the value of the per-cpu variable name to value val. 188 */ 189 #define __PCPU_SET(name, val) { \ 190 __pcpu_type(name) __val; \ 191 struct __s { \ 192 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 193 } __s; \ 194 \ 195 __val = (val); \ 196 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 197 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 198 __s = *(struct __s *)(void *)&__val; \ 199 __asm __volatile("mov %1,%%gs:%0" \ 200 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 201 : "r" (__s)); \ 202 } else { \ 203 *__PCPU_PTR(name) = __val; \ 204 } \ 205 } 206 207 #define get_pcpu() __extension__ ({ \ 208 struct pcpu *__pc; \ 209 \ 210 __asm __volatile("movq %%gs:%1,%0" \ 211 : "=r" (__pc) \ 212 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace)))); \ 213 __pc; \ 214 }) 215 216 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 217 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 218 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 219 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 220 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 221 222 #define OFFSETOF_CURTHREAD 0 223 #ifdef __clang__ 224 #pragma clang diagnostic push 225 #pragma clang diagnostic ignored "-Wnull-dereference" 226 #endif 227 static __inline __pure2 struct thread * 228 __curthread(void) 229 { 230 struct thread *td; 231 232 __asm("movq %%gs:%1,%0" : "=r" (td) 233 : "m" (*(char *)OFFSETOF_CURTHREAD)); 234 return (td); 235 } 236 #ifdef __clang__ 237 #pragma clang diagnostic pop 238 #endif 239 #define curthread (__curthread()) 240 241 #define OFFSETOF_CURPCB 32 242 static __inline __pure2 struct pcb * 243 __curpcb(void) 244 { 245 struct pcb *pcb; 246 247 __asm("movq %%gs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 248 return (pcb); 249 } 250 #define curpcb (__curpcb()) 251 252 #define IS_BSP() (PCPU_GET(cpuid) == 0) 253 254 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 255 256 #error "this file needs to be ported to your compiler" 257 258 #endif /* lint, etc. */ 259 260 #endif /* _KERNEL */ 261 262 #endif /* !_MACHINE_PCPU_H_ */ 263