1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) Peter Wemm <peter@netplex.com.au> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #ifndef _MACHINE_PCPU_H_ 32 #define _MACHINE_PCPU_H_ 33 34 #ifndef _SYS_CDEFS_H_ 35 #error "sys/cdefs.h is a prerequisite for this file" 36 #endif 37 38 /* 39 * The SMP parts are setup in pmap.c and locore.s for the BSP, and 40 * mp_machdep.c sets up the data for the AP's to "see" when they awake. 41 * The reason for doing it via a struct is so that an array of pointers 42 * to each CPU's data can be set up for things like "check curproc on all 43 * other processors" 44 */ 45 #define PCPU_MD_FIELDS \ 46 char pc_monitorbuf[128] __aligned(128); /* cache line */ \ 47 struct pcpu *pc_prvspace; /* Self-reference */ \ 48 struct pmap *pc_curpmap; \ 49 struct amd64tss *pc_tssp; /* TSS segment active on CPU */ \ 50 struct amd64tss *pc_commontssp;/* Common TSS for the CPU */ \ 51 register_t pc_rsp0; \ 52 register_t pc_scratch_rsp; /* User %rsp in syscall */ \ 53 u_int pc_apic_id; \ 54 u_int pc_acpi_id; /* ACPI CPU id */ \ 55 /* Pointer to the CPU %fs descriptor */ \ 56 struct user_segment_descriptor *pc_fs32p; \ 57 /* Pointer to the CPU %gs descriptor */ \ 58 struct user_segment_descriptor *pc_gs32p; \ 59 /* Pointer to the CPU LDT descriptor */ \ 60 struct system_segment_descriptor *pc_ldt; \ 61 /* Pointer to the CPU TSS descriptor */ \ 62 struct system_segment_descriptor *pc_tss; \ 63 uint64_t pc_pm_save_cnt; \ 64 u_int pc_cmci_mask; /* MCx banks for CMCI */ \ 65 uint64_t pc_dbreg[16]; /* ddb debugging regs */ \ 66 int pc_dbreg_cmd; /* ddb debugging reg cmd */ \ 67 u_int pc_vcpu_id; /* Xen vCPU ID */ \ 68 uint32_t pc_pcid_next; \ 69 uint32_t pc_pcid_gen; \ 70 uint32_t pc_smp_tlb_done; /* TLB op acknowledgement */ \ 71 char __pad[384] /* be divisor of PAGE_SIZE \ 72 after cache alignment */ 73 74 #define PC_DBREG_CMD_NONE 0 75 #define PC_DBREG_CMD_LOAD 1 76 77 #ifdef _KERNEL 78 79 #if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 80 81 /* 82 * Evaluates to the byte offset of the per-cpu variable name. 83 */ 84 #define __pcpu_offset(name) \ 85 __offsetof(struct pcpu, name) 86 87 /* 88 * Evaluates to the type of the per-cpu variable name. 89 */ 90 #define __pcpu_type(name) \ 91 __typeof(((struct pcpu *)0)->name) 92 93 /* 94 * Evaluates to the address of the per-cpu variable name. 95 */ 96 #define __PCPU_PTR(name) __extension__ ({ \ 97 __pcpu_type(name) *__p; \ 98 \ 99 __asm __volatile("movq %%gs:%1,%0; addq %2,%0" \ 100 : "=r" (__p) \ 101 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 102 "i" (__pcpu_offset(name))); \ 103 \ 104 __p; \ 105 }) 106 107 /* 108 * Evaluates to the value of the per-cpu variable name. 109 */ 110 #define __PCPU_GET(name) __extension__ ({ \ 111 __pcpu_type(name) __res; \ 112 struct __s { \ 113 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 114 } __s; \ 115 \ 116 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 117 sizeof(__res) == 4 || sizeof(__res) == 8) { \ 118 __asm __volatile("mov %%gs:%1,%0" \ 119 : "=r" (__s) \ 120 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 121 *(struct __s *)(void *)&__res = __s; \ 122 } else { \ 123 __res = *__PCPU_PTR(name); \ 124 } \ 125 __res; \ 126 }) 127 128 /* 129 * Adds the value to the per-cpu counter name. The implementation 130 * must be atomic with respect to interrupts. 131 */ 132 #define __PCPU_ADD(name, val) do { \ 133 __pcpu_type(name) __val; \ 134 struct __s { \ 135 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 136 } __s; \ 137 \ 138 __val = (val); \ 139 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 140 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 141 __s = *(struct __s *)(void *)&__val; \ 142 __asm __volatile("add %1,%%gs:%0" \ 143 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 144 : "r" (__s)); \ 145 } else \ 146 *__PCPU_PTR(name) += __val; \ 147 } while (0) 148 149 /* 150 * Increments the value of the per-cpu counter name. The implementation 151 * must be atomic with respect to interrupts. 152 */ 153 #define __PCPU_INC(name) do { \ 154 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 155 sizeof(__pcpu_type(name)) == 2 || \ 156 sizeof(__pcpu_type(name)) == 4 || \ 157 sizeof(__pcpu_type(name)) == 8); \ 158 if (sizeof(__pcpu_type(name)) == 1) { \ 159 __asm __volatile("incb %%gs:%0" \ 160 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 161 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 162 } else if (sizeof(__pcpu_type(name)) == 2) { \ 163 __asm __volatile("incw %%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)) == 4) { \ 167 __asm __volatile("incl %%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)) == 8) { \ 171 __asm __volatile("incq %%gs:%0" \ 172 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 173 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 174 } \ 175 } while (0) 176 177 /* 178 * Sets the value of the per-cpu variable name to value val. 179 */ 180 #define __PCPU_SET(name, val) { \ 181 __pcpu_type(name) __val; \ 182 struct __s { \ 183 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 184 } __s; \ 185 \ 186 __val = (val); \ 187 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 188 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 189 __s = *(struct __s *)(void *)&__val; \ 190 __asm __volatile("mov %1,%%gs:%0" \ 191 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 192 : "r" (__s)); \ 193 } else { \ 194 *__PCPU_PTR(name) = __val; \ 195 } \ 196 } 197 198 #define get_pcpu() __extension__ ({ \ 199 struct pcpu *__pc; \ 200 \ 201 __asm __volatile("movq %%gs:%1,%0" \ 202 : "=r" (__pc) \ 203 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace)))); \ 204 __pc; \ 205 }) 206 207 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 208 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 209 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 210 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 211 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 212 213 #define OFFSETOF_CURTHREAD 0 214 #ifdef __clang__ 215 #pragma clang diagnostic push 216 #pragma clang diagnostic ignored "-Wnull-dereference" 217 #endif 218 static __inline __pure2 struct thread * 219 __curthread(void) 220 { 221 struct thread *td; 222 223 __asm("movq %%gs:%1,%0" : "=r" (td) 224 : "m" (*(char *)OFFSETOF_CURTHREAD)); 225 return (td); 226 } 227 #ifdef __clang__ 228 #pragma clang diagnostic pop 229 #endif 230 #define curthread (__curthread()) 231 232 #define OFFSETOF_CURPCB 32 233 static __inline __pure2 struct pcb * 234 __curpcb(void) 235 { 236 struct pcb *pcb; 237 238 __asm("movq %%gs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 239 return (pcb); 240 } 241 #define curpcb (__curpcb()) 242 243 #define IS_BSP() (PCPU_GET(cpuid) == 0) 244 245 #else /* !__GNUCLIKE_ASM || !__GNUCLIKE___TYPEOF */ 246 247 #error "this file needs to be ported to your compiler" 248 249 #endif /* __GNUCLIKE_ASM && __GNUCLIKE___TYPEOF */ 250 251 #endif /* _KERNEL */ 252 253 #endif /* !_MACHINE_PCPU_H_ */ 254