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 #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 uint64_t pc_saved_ucr3; \ 55 register_t pc_rsp0; \ 56 register_t pc_scratch_rsp; /* User %rsp in syscall */ \ 57 register_t pc_scratch_rax; \ 58 u_int pc_apic_id; \ 59 u_int pc_acpi_id; /* ACPI CPU id */ \ 60 /* Pointer to the CPU %fs descriptor */ \ 61 struct user_segment_descriptor *pc_fs32p; \ 62 /* Pointer to the CPU %gs descriptor */ \ 63 struct user_segment_descriptor *pc_gs32p; \ 64 /* Pointer to the CPU LDT descriptor */ \ 65 struct system_segment_descriptor *pc_ldt; \ 66 /* Pointer to the CPU TSS descriptor */ \ 67 struct system_segment_descriptor *pc_tss; \ 68 uint64_t pc_pm_save_cnt; \ 69 u_int pc_cmci_mask; /* MCx banks for CMCI */ \ 70 uint64_t pc_dbreg[16]; /* ddb debugging regs */ \ 71 uint64_t pc_pti_stack[PC_PTI_STACK_SZ]; \ 72 int pc_dbreg_cmd; /* ddb debugging reg cmd */ \ 73 u_int pc_vcpu_id; /* Xen vCPU ID */ \ 74 uint32_t pc_pcid_next; \ 75 uint32_t pc_pcid_gen; \ 76 uint32_t pc_smp_tlb_done; /* TLB op acknowledgement */ \ 77 char __pad[224] /* be divisor of PAGE_SIZE \ 78 after cache alignment */ 79 80 #define PC_DBREG_CMD_NONE 0 81 #define PC_DBREG_CMD_LOAD 1 82 83 #ifdef _KERNEL 84 85 #if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 86 87 /* 88 * Evaluates to the byte offset of the per-cpu variable name. 89 */ 90 #define __pcpu_offset(name) \ 91 __offsetof(struct pcpu, name) 92 93 /* 94 * Evaluates to the type of the per-cpu variable name. 95 */ 96 #define __pcpu_type(name) \ 97 __typeof(((struct pcpu *)0)->name) 98 99 /* 100 * Evaluates to the address of the per-cpu variable name. 101 */ 102 #define __PCPU_PTR(name) __extension__ ({ \ 103 __pcpu_type(name) *__p; \ 104 \ 105 __asm __volatile("movq %%gs:%1,%0; addq %2,%0" \ 106 : "=r" (__p) \ 107 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 108 "i" (__pcpu_offset(name))); \ 109 \ 110 __p; \ 111 }) 112 113 /* 114 * Evaluates to the value of the per-cpu variable name. 115 */ 116 #define __PCPU_GET(name) __extension__ ({ \ 117 __pcpu_type(name) __res; \ 118 struct __s { \ 119 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 120 } __s; \ 121 \ 122 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 123 sizeof(__res) == 4 || sizeof(__res) == 8) { \ 124 __asm __volatile("mov %%gs:%1,%0" \ 125 : "=r" (__s) \ 126 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 127 *(struct __s *)(void *)&__res = __s; \ 128 } else { \ 129 __res = *__PCPU_PTR(name); \ 130 } \ 131 __res; \ 132 }) 133 134 /* 135 * Adds the value to the per-cpu counter name. The implementation 136 * must be atomic with respect to interrupts. 137 */ 138 #define __PCPU_ADD(name, val) do { \ 139 __pcpu_type(name) __val; \ 140 struct __s { \ 141 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 142 } __s; \ 143 \ 144 __val = (val); \ 145 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 146 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 147 __s = *(struct __s *)(void *)&__val; \ 148 __asm __volatile("add %1,%%gs:%0" \ 149 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 150 : "r" (__s)); \ 151 } else \ 152 *__PCPU_PTR(name) += __val; \ 153 } while (0) 154 155 /* 156 * Increments the value of the per-cpu counter name. The implementation 157 * must be atomic with respect to interrupts. 158 */ 159 #define __PCPU_INC(name) do { \ 160 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 161 sizeof(__pcpu_type(name)) == 2 || \ 162 sizeof(__pcpu_type(name)) == 4 || \ 163 sizeof(__pcpu_type(name)) == 8); \ 164 if (sizeof(__pcpu_type(name)) == 1) { \ 165 __asm __volatile("incb %%gs:%0" \ 166 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 167 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 168 } else if (sizeof(__pcpu_type(name)) == 2) { \ 169 __asm __volatile("incw %%gs:%0" \ 170 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 171 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 172 } else if (sizeof(__pcpu_type(name)) == 4) { \ 173 __asm __volatile("incl %%gs:%0" \ 174 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 175 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 176 } else if (sizeof(__pcpu_type(name)) == 8) { \ 177 __asm __volatile("incq %%gs:%0" \ 178 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 179 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 180 } \ 181 } while (0) 182 183 /* 184 * Sets the value of the per-cpu variable name to value val. 185 */ 186 #define __PCPU_SET(name, val) { \ 187 __pcpu_type(name) __val; \ 188 struct __s { \ 189 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 190 } __s; \ 191 \ 192 __val = (val); \ 193 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 194 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 195 __s = *(struct __s *)(void *)&__val; \ 196 __asm __volatile("mov %1,%%gs:%0" \ 197 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 198 : "r" (__s)); \ 199 } else { \ 200 *__PCPU_PTR(name) = __val; \ 201 } \ 202 } 203 204 #define get_pcpu() __extension__ ({ \ 205 struct pcpu *__pc; \ 206 \ 207 __asm __volatile("movq %%gs:%1,%0" \ 208 : "=r" (__pc) \ 209 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace)))); \ 210 __pc; \ 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 /* !__GNUCLIKE_ASM || !__GNUCLIKE___TYPEOF */ 252 253 #error "this file needs to be ported to your compiler" 254 255 #endif /* __GNUCLIKE_ASM && __GNUCLIKE___TYPEOF */ 256 257 #endif /* _KERNEL */ 258 259 #endif /* !_MACHINE_PCPU_H_ */ 260