1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) Peter Wemm <[email protected]> 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 #define PC_PTI_STACK_SZ 16 39 /* 40 * The SMP parts are setup in pmap.c and locore.s for the BSP, and 41 * mp_machdep.c sets up the data for the AP's to "see" when they awake. 42 * The reason for doing it via a struct is so that an array of pointers 43 * to each CPU's data can be set up for things like "check curproc on all 44 * other processors" 45 */ 46 #define PCPU_MD_FIELDS \ 47 char pc_monitorbuf[128] __aligned(128); /* cache line */ \ 48 struct pcpu *pc_prvspace; /* Self-reference */ \ 49 struct pmap *pc_curpmap; \ 50 struct amd64tss *pc_tssp; /* TSS segment active on CPU */ \ 51 struct amd64tss *pc_commontssp;/* Common TSS for the CPU */ \ 52 uint64_t pc_kcr3; \ 53 uint64_t pc_ucr3; \ 54 register_t pc_rsp0; \ 55 register_t pc_scratch_rsp; /* User %rsp in syscall */ \ 56 register_t pc_scratch_rax; \ 57 u_int pc_apic_id; \ 58 u_int pc_acpi_id; /* ACPI CPU id */ \ 59 /* Pointer to the CPU %fs descriptor */ \ 60 struct user_segment_descriptor *pc_fs32p; \ 61 /* Pointer to the CPU %gs descriptor */ \ 62 struct user_segment_descriptor *pc_gs32p; \ 63 /* Pointer to the CPU LDT descriptor */ \ 64 struct system_segment_descriptor *pc_ldt; \ 65 /* Pointer to the CPU TSS descriptor */ \ 66 struct system_segment_descriptor *pc_tss; \ 67 uint64_t pc_pm_save_cnt; \ 68 u_int pc_cmci_mask; /* MCx banks for CMCI */ \ 69 uint64_t pc_dbreg[16]; /* ddb debugging regs */ \ 70 uint64_t pc_pti_stack[PC_PTI_STACK_SZ]; \ 71 int pc_dbreg_cmd; /* ddb debugging reg cmd */ \ 72 u_int pc_vcpu_id; /* Xen vCPU ID */ \ 73 uint32_t pc_pcid_next; \ 74 uint32_t pc_pcid_gen; \ 75 uint32_t pc_smp_tlb_done; /* TLB op acknowledgement */ \ 76 char __pad[232] /* be divisor of PAGE_SIZE \ 77 after cache alignment */ 78 79 #define PC_DBREG_CMD_NONE 0 80 #define PC_DBREG_CMD_LOAD 1 81 82 #ifdef _KERNEL 83 84 #if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 85 86 /* 87 * Evaluates to the byte offset of the per-cpu variable name. 88 */ 89 #define __pcpu_offset(name) \ 90 __offsetof(struct pcpu, name) 91 92 /* 93 * Evaluates to the type of the per-cpu variable name. 94 */ 95 #define __pcpu_type(name) \ 96 __typeof(((struct pcpu *)0)->name) 97 98 /* 99 * Evaluates to the address of the per-cpu variable name. 100 */ 101 #define __PCPU_PTR(name) __extension__ ({ \ 102 __pcpu_type(name) *__p; \ 103 \ 104 __asm __volatile("movq %%gs:%1,%0; addq %2,%0" \ 105 : "=r" (__p) \ 106 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 107 "i" (__pcpu_offset(name))); \ 108 \ 109 __p; \ 110 }) 111 112 /* 113 * Evaluates to the value of the per-cpu variable name. 114 */ 115 #define __PCPU_GET(name) __extension__ ({ \ 116 __pcpu_type(name) __res; \ 117 struct __s { \ 118 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 119 } __s; \ 120 \ 121 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 122 sizeof(__res) == 4 || sizeof(__res) == 8) { \ 123 __asm __volatile("mov %%gs:%1,%0" \ 124 : "=r" (__s) \ 125 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 126 *(struct __s *)(void *)&__res = __s; \ 127 } else { \ 128 __res = *__PCPU_PTR(name); \ 129 } \ 130 __res; \ 131 }) 132 133 /* 134 * Adds the value to the per-cpu counter name. The implementation 135 * must be atomic with respect to interrupts. 136 */ 137 #define __PCPU_ADD(name, val) do { \ 138 __pcpu_type(name) __val; \ 139 struct __s { \ 140 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 141 } __s; \ 142 \ 143 __val = (val); \ 144 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 145 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 146 __s = *(struct __s *)(void *)&__val; \ 147 __asm __volatile("add %1,%%gs:%0" \ 148 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 149 : "r" (__s)); \ 150 } else \ 151 *__PCPU_PTR(name) += __val; \ 152 } while (0) 153 154 /* 155 * Increments the value of the per-cpu counter name. The implementation 156 * must be atomic with respect to interrupts. 157 */ 158 #define __PCPU_INC(name) do { \ 159 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 160 sizeof(__pcpu_type(name)) == 2 || \ 161 sizeof(__pcpu_type(name)) == 4 || \ 162 sizeof(__pcpu_type(name)) == 8); \ 163 if (sizeof(__pcpu_type(name)) == 1) { \ 164 __asm __volatile("incb %%gs:%0" \ 165 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 166 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 167 } else if (sizeof(__pcpu_type(name)) == 2) { \ 168 __asm __volatile("incw %%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)) == 4) { \ 172 __asm __volatile("incl %%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)) == 8) { \ 176 __asm __volatile("incq %%gs:%0" \ 177 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 178 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 179 } \ 180 } while (0) 181 182 /* 183 * Sets the value of the per-cpu variable name to value val. 184 */ 185 #define __PCPU_SET(name, val) { \ 186 __pcpu_type(name) __val; \ 187 struct __s { \ 188 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 189 } __s; \ 190 \ 191 __val = (val); \ 192 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 193 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 194 __s = *(struct __s *)(void *)&__val; \ 195 __asm __volatile("mov %1,%%gs:%0" \ 196 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 197 : "r" (__s)); \ 198 } else { \ 199 *__PCPU_PTR(name) = __val; \ 200 } \ 201 } 202 203 #define get_pcpu() __extension__ ({ \ 204 struct pcpu *__pc; \ 205 \ 206 __asm __volatile("movq %%gs:%1,%0" \ 207 : "=r" (__pc) \ 208 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace)))); \ 209 __pc; \ 210 }) 211 212 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 213 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 214 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 215 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 216 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 217 218 #define OFFSETOF_CURTHREAD 0 219 #ifdef __clang__ 220 #pragma clang diagnostic push 221 #pragma clang diagnostic ignored "-Wnull-dereference" 222 #endif 223 static __inline __pure2 struct thread * 224 __curthread(void) 225 { 226 struct thread *td; 227 228 __asm("movq %%gs:%1,%0" : "=r" (td) 229 : "m" (*(char *)OFFSETOF_CURTHREAD)); 230 return (td); 231 } 232 #ifdef __clang__ 233 #pragma clang diagnostic pop 234 #endif 235 #define curthread (__curthread()) 236 237 #define OFFSETOF_CURPCB 32 238 static __inline __pure2 struct pcb * 239 __curpcb(void) 240 { 241 struct pcb *pcb; 242 243 __asm("movq %%gs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 244 return (pcb); 245 } 246 #define curpcb (__curpcb()) 247 248 #define IS_BSP() (PCPU_GET(cpuid) == 0) 249 250 #else /* !__GNUCLIKE_ASM || !__GNUCLIKE___TYPEOF */ 251 252 #error "this file needs to be ported to your compiler" 253 254 #endif /* __GNUCLIKE_ASM && __GNUCLIKE___TYPEOF */ 255 256 #endif /* _KERNEL */ 257 258 #endif /* !_MACHINE_PCPU_H_ */ 259