1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) Peter Wemm 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 #include <machine/segments.h> 39 #include <machine/tss.h> 40 41 #include <sys/_lock.h> 42 #include <sys/_mutex.h> 43 44 struct monitorbuf { 45 int idle_state; /* Used by cpu_idle_mwait. */ 46 int stop_state; /* Used by cpustop_handler. */ 47 char padding[128 - (2 * sizeof(int))]; 48 }; 49 _Static_assert(sizeof(struct monitorbuf) == 128, "2x cache line"); 50 51 /* 52 * The SMP parts are setup in pmap.c and machdep.c for the BSP, and 53 * pmap.c and mp_machdep.c sets up the data for the AP's to "see" when 54 * they awake. The reason for doing it via a struct is so that an 55 * array of pointers to each CPU's data can be set up for things like 56 * "check curproc on all other processors" 57 */ 58 59 #define PCPU_MD_FIELDS \ 60 struct monitorbuf pc_monitorbuf __aligned(128); /* cache line */\ 61 struct pcpu *pc_prvspace; /* Self-reference */ \ 62 struct pmap *pc_curpmap; \ 63 struct segment_descriptor pc_common_tssd; \ 64 struct segment_descriptor *pc_tss_gdt; \ 65 struct segment_descriptor *pc_fsgs_gdt; \ 66 struct i386tss *pc_common_tssp; \ 67 u_int pc_kesp0; \ 68 u_int pc_trampstk; \ 69 int pc_currentldt; \ 70 u_int pc_acpi_id; /* ACPI CPU id */ \ 71 u_int pc_apic_id; \ 72 int pc_private_tss; /* Flag indicating private tss*/\ 73 u_int pc_cmci_mask; /* MCx banks for CMCI */ \ 74 u_int pc_vcpu_id; /* Xen vCPU ID */ \ 75 struct mtx pc_cmap_lock; \ 76 void *pc_cmap_pte1; \ 77 void *pc_cmap_pte2; \ 78 caddr_t pc_cmap_addr1; \ 79 caddr_t pc_cmap_addr2; \ 80 vm_offset_t pc_qmap_addr; /* KVA for temporary mappings */\ 81 vm_offset_t pc_copyout_maddr; \ 82 vm_offset_t pc_copyout_saddr; \ 83 struct mtx pc_copyout_mlock; \ 84 struct sx pc_copyout_slock; \ 85 char *pc_copyout_buf; \ 86 vm_offset_t pc_pmap_eh_va; \ 87 caddr_t pc_pmap_eh_ptep; \ 88 uint32_t pc_smp_tlb_done; /* TLB op acknowledgement */ \ 89 uint32_t pc_ibpb_set; \ 90 char __pad[3610] 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("movl %%fs:%1,%0; addl %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(__res), 4)]; \ 132 } __s; \ 133 \ 134 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 135 sizeof(__res) == 4) { \ 136 __asm __volatile("mov %%fs:%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 a value of 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(__val), 4)]; \ 154 } __s; \ 155 \ 156 __val = (val); \ 157 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 158 sizeof(__val) == 4) { \ 159 __s = *(struct __s *)(void *)&__val; \ 160 __asm __volatile("add %1,%%fs:%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 if (sizeof(__pcpu_type(name)) == 1) { \ 176 __asm __volatile("incb %%fs:%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 %%fs:%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 %%fs:%0" \ 185 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 186 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 187 } \ 188 } while (0) 189 190 /* 191 * Sets the value of the per-cpu variable name to value val. 192 */ 193 #define __PCPU_SET(name, val) do { \ 194 __pcpu_type(name) __val; \ 195 struct __s { \ 196 u_char __b[MIN(sizeof(__val), 4)]; \ 197 } __s; \ 198 \ 199 __val = (val); \ 200 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 201 sizeof(__val) == 4) { \ 202 __s = *(struct __s *)(void *)&__val; \ 203 __asm __volatile("mov %1,%%fs:%0" \ 204 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 205 : "r" (__s)); \ 206 } else { \ 207 *__PCPU_PTR(name) = __val; \ 208 } \ 209 } while (0) 210 211 #define get_pcpu() __extension__ ({ \ 212 struct pcpu *__pc; \ 213 \ 214 __asm __volatile("movl %%fs:%1,%0" \ 215 : "=r" (__pc) \ 216 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace)))); \ 217 __pc; \ 218 }) 219 220 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 221 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 222 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 223 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 224 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 225 226 #define OFFSETOF_CURTHREAD 0 227 #ifdef __clang__ 228 #pragma clang diagnostic push 229 #pragma clang diagnostic ignored "-Wnull-dereference" 230 #endif 231 static __inline __pure2 struct thread * 232 __curthread(void) 233 { 234 struct thread *td; 235 236 __asm("movl %%fs:%1,%0" : "=r" (td) 237 : "m" (*(char *)OFFSETOF_CURTHREAD)); 238 return (td); 239 } 240 #ifdef __clang__ 241 #pragma clang diagnostic pop 242 #endif 243 #define curthread (__curthread()) 244 245 #define OFFSETOF_CURPCB 16 246 static __inline __pure2 struct pcb * 247 __curpcb(void) 248 { 249 struct pcb *pcb; 250 251 __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 252 return (pcb); 253 } 254 #define curpcb (__curpcb()) 255 256 #define IS_BSP() (PCPU_GET(cpuid) == 0) 257 258 #else /* defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 259 260 #error "this file needs to be ported to your compiler" 261 262 #endif /* __GNUCLIKE_ASM etc. */ 263 264 #endif /* _KERNEL */ 265 266 #endif /* !_MACHINE_PCPU_H_ */ 267