pcpu.h revision 330897
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: stable/11/sys/amd64/include/pcpu.h 330897 2018-03-14 03:19:51Z eadler $ 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 uint32_t pc_ibpb_set; \ 78 char __pad[96] /* be divisor of PAGE_SIZE \ 79 after cache alignment */ 80 81#define PC_DBREG_CMD_NONE 0 82#define PC_DBREG_CMD_LOAD 1 83 84#ifdef _KERNEL 85 86#ifdef lint 87 88extern struct pcpu *pcpup; 89 90#define PCPU_GET(member) (pcpup->pc_ ## member) 91#define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val)) 92#define PCPU_INC(member) PCPU_ADD(member, 1) 93#define PCPU_PTR(member) (&pcpup->pc_ ## member) 94#define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 95 96#elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 97 98/* 99 * Evaluates to the byte offset of the per-cpu variable name. 100 */ 101#define __pcpu_offset(name) \ 102 __offsetof(struct pcpu, name) 103 104/* 105 * Evaluates to the type of the per-cpu variable name. 106 */ 107#define __pcpu_type(name) \ 108 __typeof(((struct pcpu *)0)->name) 109 110/* 111 * Evaluates to the address of the per-cpu variable name. 112 */ 113#define __PCPU_PTR(name) __extension__ ({ \ 114 __pcpu_type(name) *__p; \ 115 \ 116 __asm __volatile("movq %%gs:%1,%0; addq %2,%0" \ 117 : "=r" (__p) \ 118 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 119 "i" (__pcpu_offset(name))); \ 120 \ 121 __p; \ 122}) 123 124/* 125 * Evaluates to the value of the per-cpu variable name. 126 */ 127#define __PCPU_GET(name) __extension__ ({ \ 128 __pcpu_type(name) __res; \ 129 struct __s { \ 130 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 131 } __s; \ 132 \ 133 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 134 sizeof(__res) == 4 || sizeof(__res) == 8) { \ 135 __asm __volatile("mov %%gs:%1,%0" \ 136 : "=r" (__s) \ 137 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 138 *(struct __s *)(void *)&__res = __s; \ 139 } else { \ 140 __res = *__PCPU_PTR(name); \ 141 } \ 142 __res; \ 143}) 144 145/* 146 * Adds the value to the per-cpu counter name. The implementation 147 * must be atomic with respect to interrupts. 148 */ 149#define __PCPU_ADD(name, val) do { \ 150 __pcpu_type(name) __val; \ 151 struct __s { \ 152 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 153 } __s; \ 154 \ 155 __val = (val); \ 156 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 157 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 158 __s = *(struct __s *)(void *)&__val; \ 159 __asm __volatile("add %1,%%gs:%0" \ 160 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 161 : "r" (__s)); \ 162 } else \ 163 *__PCPU_PTR(name) += __val; \ 164} while (0) 165 166/* 167 * Increments the value of the per-cpu counter name. The implementation 168 * must be atomic with respect to interrupts. 169 */ 170#define __PCPU_INC(name) do { \ 171 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 172 sizeof(__pcpu_type(name)) == 2 || \ 173 sizeof(__pcpu_type(name)) == 4 || \ 174 sizeof(__pcpu_type(name)) == 8); \ 175 if (sizeof(__pcpu_type(name)) == 1) { \ 176 __asm __volatile("incb %%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)) == 2) { \ 180 __asm __volatile("incw %%gs:%0" \ 181 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 182 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 183 } else if (sizeof(__pcpu_type(name)) == 4) { \ 184 __asm __volatile("incl %%gs:%0" \ 185 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 186 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 187 } else if (sizeof(__pcpu_type(name)) == 8) { \ 188 __asm __volatile("incq %%gs:%0" \ 189 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 190 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 191 } \ 192} while (0) 193 194/* 195 * Sets the value of the per-cpu variable name to value val. 196 */ 197#define __PCPU_SET(name, val) { \ 198 __pcpu_type(name) __val; \ 199 struct __s { \ 200 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 201 } __s; \ 202 \ 203 __val = (val); \ 204 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 205 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 206 __s = *(struct __s *)(void *)&__val; \ 207 __asm __volatile("mov %1,%%gs:%0" \ 208 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 209 : "r" (__s)); \ 210 } else { \ 211 *__PCPU_PTR(name) = __val; \ 212 } \ 213} 214 215#define PCPU_GET(member) __PCPU_GET(pc_ ## member) 216#define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 217#define PCPU_INC(member) __PCPU_INC(pc_ ## member) 218#define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 219#define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 220 221#define OFFSETOF_CURTHREAD 0 222#ifdef __clang__ 223#pragma clang diagnostic push 224#pragma clang diagnostic ignored "-Wnull-dereference" 225#endif 226static __inline __pure2 struct thread * 227__curthread(void) 228{ 229 struct thread *td; 230 231 __asm("movq %%gs:%1,%0" : "=r" (td) 232 : "m" (*(char *)OFFSETOF_CURTHREAD)); 233 return (td); 234} 235#ifdef __clang__ 236#pragma clang diagnostic pop 237#endif 238#define curthread (__curthread()) 239 240#define OFFSETOF_CURPCB 32 241static __inline __pure2 struct pcb * 242__curpcb(void) 243{ 244 struct pcb *pcb; 245 246 __asm("movq %%gs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 247 return (pcb); 248} 249#define curpcb (__curpcb()) 250 251#define IS_BSP() (PCPU_GET(cpuid) == 0) 252 253#else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 254 255#error "this file needs to be ported to your compiler" 256 257#endif /* lint, etc. */ 258 259#endif /* _KERNEL */ 260 261#endif /* !_MACHINE_PCPU_H_ */ 262