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 struct monitorbuf { 41 int idle_state; /* Used by cpu_idle_mwait. */ 42 int stop_state; /* Used by cpustop_handler. */ 43 char padding[128 - (2 * sizeof(int))]; 44 }; 45 _Static_assert(sizeof(struct monitorbuf) == 128, "2x cache line"); 46 47 /* 48 * The SMP parts are setup in pmap.c and locore.s for the BSP, and 49 * mp_machdep.c sets up the data for the AP's to "see" when they awake. 50 * The reason for doing it via a struct is so that an array of pointers 51 * to each CPU's data can be set up for things like "check curproc on all 52 * other processors" 53 */ 54 #define PCPU_MD_FIELDS \ 55 struct monitorbuf pc_monitorbuf __aligned(128); /* cache line */\ 56 struct pcpu *pc_prvspace; /* Self-reference */ \ 57 struct pmap *pc_curpmap; \ 58 struct amd64tss *pc_tssp; /* TSS segment active on CPU */ \ 59 struct amd64tss *pc_commontssp;/* Common TSS for the CPU */ \ 60 uint64_t pc_kcr3; \ 61 uint64_t pc_ucr3; \ 62 uint64_t pc_saved_ucr3; \ 63 register_t pc_rsp0; \ 64 register_t pc_scratch_rsp; /* User %rsp in syscall */ \ 65 register_t pc_scratch_rax; \ 66 u_int pc_apic_id; \ 67 u_int pc_acpi_id; /* ACPI CPU id */ \ 68 /* Pointer to the CPU %fs descriptor */ \ 69 struct user_segment_descriptor *pc_fs32p; \ 70 /* Pointer to the CPU %gs descriptor */ \ 71 struct user_segment_descriptor *pc_gs32p; \ 72 /* Pointer to the CPU LDT descriptor */ \ 73 struct system_segment_descriptor *pc_ldt; \ 74 /* Pointer to the CPU TSS descriptor */ \ 75 struct system_segment_descriptor *pc_tss; \ 76 uint64_t pc_pm_save_cnt; \ 77 u_int pc_cmci_mask; /* MCx banks for CMCI */ \ 78 uint64_t pc_dbreg[16]; /* ddb debugging regs */ \ 79 uint64_t pc_pti_stack[PC_PTI_STACK_SZ]; \ 80 register_t pc_pti_rsp0; \ 81 int pc_dbreg_cmd; /* ddb debugging reg cmd */ \ 82 u_int pc_vcpu_id; /* Xen vCPU ID */ \ 83 uint32_t pc_pcid_next; \ 84 uint32_t pc_pcid_gen; \ 85 uint32_t pc_smp_tlb_done; /* TLB op acknowledgement */ \ 86 uint32_t pc_ibpb_set; \ 87 char __pad[3288] /* pad to UMA_PCPU_ALLOC_SIZE */ 88 89 #define PC_DBREG_CMD_NONE 0 90 #define PC_DBREG_CMD_LOAD 1 91 92 #ifdef _KERNEL 93 94 #define MONITOR_STOPSTATE_RUNNING 0 95 #define MONITOR_STOPSTATE_STOPPED 1 96 97 #if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 98 99 /* 100 * Evaluates to the byte offset of the per-cpu variable name. 101 */ 102 #define __pcpu_offset(name) \ 103 __offsetof(struct pcpu, name) 104 105 /* 106 * Evaluates to the type of the per-cpu variable name. 107 */ 108 #define __pcpu_type(name) \ 109 __typeof(((struct pcpu *)0)->name) 110 111 /* 112 * Evaluates to the address of the per-cpu variable name. 113 */ 114 #define __PCPU_PTR(name) __extension__ ({ \ 115 __pcpu_type(name) *__p; \ 116 \ 117 __asm __volatile("movq %%gs:%1,%0; addq %2,%0" \ 118 : "=r" (__p) \ 119 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 120 "i" (__pcpu_offset(name))); \ 121 \ 122 __p; \ 123 }) 124 125 /* 126 * Evaluates to the value of the per-cpu variable name. 127 */ 128 #define __PCPU_GET(name) __extension__ ({ \ 129 __pcpu_type(name) __res; \ 130 struct __s { \ 131 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 132 } __s; \ 133 \ 134 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 135 sizeof(__res) == 4 || sizeof(__res) == 8) { \ 136 __asm __volatile("mov %%gs:%1,%0" \ 137 : "=r" (__s) \ 138 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 139 *(struct __s *)(void *)&__res = __s; \ 140 } else { \ 141 __res = *__PCPU_PTR(name); \ 142 } \ 143 __res; \ 144 }) 145 146 /* 147 * Adds the value to the per-cpu counter name. The implementation 148 * must be atomic with respect to interrupts. 149 */ 150 #define __PCPU_ADD(name, val) do { \ 151 __pcpu_type(name) __val; \ 152 struct __s { \ 153 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 154 } __s; \ 155 \ 156 __val = (val); \ 157 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 158 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 159 __s = *(struct __s *)(void *)&__val; \ 160 __asm __volatile("add %1,%%gs:%0" \ 161 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 162 : "r" (__s)); \ 163 } else \ 164 *__PCPU_PTR(name) += __val; \ 165 } while (0) 166 167 /* 168 * Increments the value of the per-cpu counter name. The implementation 169 * must be atomic with respect to interrupts. 170 */ 171 #define __PCPU_INC(name) do { \ 172 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 173 sizeof(__pcpu_type(name)) == 2 || \ 174 sizeof(__pcpu_type(name)) == 4 || \ 175 sizeof(__pcpu_type(name)) == 8); \ 176 if (sizeof(__pcpu_type(name)) == 1) { \ 177 __asm __volatile("incb %%gs:%0" \ 178 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 179 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 180 } else if (sizeof(__pcpu_type(name)) == 2) { \ 181 __asm __volatile("incw %%gs:%0" \ 182 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 183 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 184 } else if (sizeof(__pcpu_type(name)) == 4) { \ 185 __asm __volatile("incl %%gs:%0" \ 186 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 187 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 188 } else if (sizeof(__pcpu_type(name)) == 8) { \ 189 __asm __volatile("incq %%gs:%0" \ 190 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 191 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 192 } \ 193 } while (0) 194 195 /* 196 * Sets the value of the per-cpu variable name to value val. 197 */ 198 #define __PCPU_SET(name, val) { \ 199 __pcpu_type(name) __val; \ 200 struct __s { \ 201 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 202 } __s; \ 203 \ 204 __val = (val); \ 205 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 206 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 207 __s = *(struct __s *)(void *)&__val; \ 208 __asm __volatile("mov %1,%%gs:%0" \ 209 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 210 : "r" (__s)); \ 211 } else { \ 212 *__PCPU_PTR(name) = __val; \ 213 } \ 214 } 215 216 #define get_pcpu() __extension__ ({ \ 217 struct pcpu *__pc; \ 218 \ 219 __asm __volatile("movq %%gs:%1,%0" \ 220 : "=r" (__pc) \ 221 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace)))); \ 222 __pc; \ 223 }) 224 225 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 226 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 227 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 228 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 229 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 230 231 #define OFFSETOF_CURTHREAD 0 232 #ifdef __clang__ 233 #pragma clang diagnostic push 234 #pragma clang diagnostic ignored "-Wnull-dereference" 235 #endif 236 static __inline __pure2 struct thread * 237 __curthread(void) 238 { 239 struct thread *td; 240 241 __asm("movq %%gs:%P1,%0" : "=r" (td) : "n" (OFFSETOF_CURTHREAD)); 242 return (td); 243 } 244 #ifdef __clang__ 245 #pragma clang diagnostic pop 246 #endif 247 #define curthread (__curthread()) 248 249 #define OFFSETOF_CURPCB 32 250 static __inline __pure2 struct pcb * 251 __curpcb(void) 252 { 253 struct pcb *pcb; 254 255 __asm("movq %%gs:%P1,%0" : "=r" (pcb) : "n" (OFFSETOF_CURPCB)); 256 return (pcb); 257 } 258 #define curpcb (__curpcb()) 259 260 #define IS_BSP() (PCPU_GET(cpuid) == 0) 261 262 #else /* !__GNUCLIKE_ASM || !__GNUCLIKE___TYPEOF */ 263 264 #error "this file needs to be ported to your compiler" 265 266 #endif /* __GNUCLIKE_ASM && __GNUCLIKE___TYPEOF */ 267 268 #endif /* _KERNEL */ 269 270 #endif /* !_MACHINE_PCPU_H_ */ 271