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 /* 45 * The SMP parts are setup in pmap.c and locore.s for the BSP, and 46 * mp_machdep.c sets up the data for the AP's to "see" when they awake. 47 * The reason for doing it via a struct is so that an array of pointers 48 * to each CPU's data can be set up for things like "check curproc on all 49 * other processors" 50 */ 51 52 #define PCPU_MD_FIELDS \ 53 char pc_monitorbuf[128] __aligned(128); /* cache line */ \ 54 struct pcpu *pc_prvspace; /* Self-reference */ \ 55 struct pmap *pc_curpmap; \ 56 struct i386tss pc_common_tss; \ 57 struct segment_descriptor pc_common_tssd; \ 58 struct segment_descriptor *pc_tss_gdt; \ 59 struct segment_descriptor *pc_fsgs_gdt; \ 60 int pc_currentldt; \ 61 u_int pc_acpi_id; /* ACPI CPU id */ \ 62 u_int pc_apic_id; \ 63 int pc_private_tss; /* Flag indicating private tss*/\ 64 u_int pc_cmci_mask; /* MCx banks for CMCI */ \ 65 u_int pc_vcpu_id; /* Xen vCPU ID */ \ 66 struct mtx pc_cmap_lock; \ 67 void *pc_cmap_pte1; \ 68 void *pc_cmap_pte2; \ 69 caddr_t pc_cmap_addr1; \ 70 caddr_t pc_cmap_addr2; \ 71 vm_offset_t pc_qmap_addr; /* KVA for temporary mappings */\ 72 uint32_t pc_smp_tlb_done; /* TLB op acknowledgement */ \ 73 char __pad[445] 74 75 #ifdef _KERNEL 76 77 #if defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 78 79 /* 80 * Evaluates to the byte offset of the per-cpu variable name. 81 */ 82 #define __pcpu_offset(name) \ 83 __offsetof(struct pcpu, name) 84 85 /* 86 * Evaluates to the type of the per-cpu variable name. 87 */ 88 #define __pcpu_type(name) \ 89 __typeof(((struct pcpu *)0)->name) 90 91 /* 92 * Evaluates to the address of the per-cpu variable name. 93 */ 94 #define __PCPU_PTR(name) __extension__ ({ \ 95 __pcpu_type(name) *__p; \ 96 \ 97 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \ 98 : "=r" (__p) \ 99 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 100 "i" (__pcpu_offset(name))); \ 101 \ 102 __p; \ 103 }) 104 105 /* 106 * Evaluates to the value of the per-cpu variable name. 107 */ 108 #define __PCPU_GET(name) __extension__ ({ \ 109 __pcpu_type(name) __res; \ 110 struct __s { \ 111 u_char __b[MIN(sizeof(__res), 4)]; \ 112 } __s; \ 113 \ 114 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 115 sizeof(__res) == 4) { \ 116 __asm __volatile("mov %%fs:%1,%0" \ 117 : "=r" (__s) \ 118 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 119 *(struct __s *)(void *)&__res = __s; \ 120 } else { \ 121 __res = *__PCPU_PTR(name); \ 122 } \ 123 __res; \ 124 }) 125 126 /* 127 * Adds a value of the per-cpu counter name. The implementation 128 * must be atomic with respect to interrupts. 129 */ 130 #define __PCPU_ADD(name, val) do { \ 131 __pcpu_type(name) __val; \ 132 struct __s { \ 133 u_char __b[MIN(sizeof(__val), 4)]; \ 134 } __s; \ 135 \ 136 __val = (val); \ 137 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 138 sizeof(__val) == 4) { \ 139 __s = *(struct __s *)(void *)&__val; \ 140 __asm __volatile("add %1,%%fs:%0" \ 141 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 142 : "r" (__s)); \ 143 } else \ 144 *__PCPU_PTR(name) += __val; \ 145 } while (0) 146 147 /* 148 * Increments the value of the per-cpu counter name. The implementation 149 * must be atomic with respect to interrupts. 150 */ 151 #define __PCPU_INC(name) do { \ 152 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 153 sizeof(__pcpu_type(name)) == 2 || \ 154 sizeof(__pcpu_type(name)) == 4); \ 155 if (sizeof(__pcpu_type(name)) == 1) { \ 156 __asm __volatile("incb %%fs:%0" \ 157 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 158 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 159 } else if (sizeof(__pcpu_type(name)) == 2) { \ 160 __asm __volatile("incw %%fs:%0" \ 161 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 162 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 163 } else if (sizeof(__pcpu_type(name)) == 4) { \ 164 __asm __volatile("incl %%fs:%0" \ 165 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 166 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 167 } \ 168 } while (0) 169 170 /* 171 * Sets the value of the per-cpu variable name to value val. 172 */ 173 #define __PCPU_SET(name, val) do { \ 174 __pcpu_type(name) __val; \ 175 struct __s { \ 176 u_char __b[MIN(sizeof(__val), 4)]; \ 177 } __s; \ 178 \ 179 __val = (val); \ 180 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 181 sizeof(__val) == 4) { \ 182 __s = *(struct __s *)(void *)&__val; \ 183 __asm __volatile("mov %1,%%fs:%0" \ 184 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 185 : "r" (__s)); \ 186 } else { \ 187 *__PCPU_PTR(name) = __val; \ 188 } \ 189 } while (0) 190 191 #define get_pcpu() __extension__ ({ \ 192 struct pcpu *__pc; \ 193 \ 194 __asm __volatile("movl %%fs:%1,%0" \ 195 : "=r" (__pc) \ 196 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace)))); \ 197 __pc; \ 198 }) 199 200 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 201 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 202 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 203 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 204 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 205 206 #define OFFSETOF_CURTHREAD 0 207 #ifdef __clang__ 208 #pragma clang diagnostic push 209 #pragma clang diagnostic ignored "-Wnull-dereference" 210 #endif 211 static __inline __pure2 struct thread * 212 __curthread(void) 213 { 214 struct thread *td; 215 216 __asm("movl %%fs:%1,%0" : "=r" (td) 217 : "m" (*(char *)OFFSETOF_CURTHREAD)); 218 return (td); 219 } 220 #ifdef __clang__ 221 #pragma clang diagnostic pop 222 #endif 223 #define curthread (__curthread()) 224 225 #define OFFSETOF_CURPCB 16 226 static __inline __pure2 struct pcb * 227 __curpcb(void) 228 { 229 struct pcb *pcb; 230 231 __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 232 return (pcb); 233 } 234 #define curpcb (__curpcb()) 235 236 #else /* defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 237 238 #error "this file needs to be ported to your compiler" 239 240 #endif /* __GNUCLIKE_ASM etc. */ 241 242 #endif /* _KERNEL */ 243 244 #endif /* !_MACHINE_PCPU_H_ */ 245