1 /*- 2 * Copyright (c) Peter Wemm <peter@netplex.com.au> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #ifndef _MACHINE_PCPU_H_ 30 #define _MACHINE_PCPU_H_ 31 32 #ifndef _SYS_CDEFS_H_ 33 #error "sys/cdefs.h is a prerequisite for this file" 34 #endif 35 36 #if defined(XEN) || defined(XENHVM) 37 #ifndef NR_VIRQS 38 #define NR_VIRQS 24 39 #endif 40 #ifndef NR_IPIS 41 #define NR_IPIS 2 42 #endif 43 #endif 44 45 /* 46 * The SMP parts are setup in pmap.c and locore.s for the BSP, and 47 * mp_machdep.c sets up the data for the AP's to "see" when they awake. 48 * The reason for doing it via a struct is so that an array of pointers 49 * to each CPU's data can be set up for things like "check curproc on all 50 * other processors" 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 amd64tss *pc_tssp; /* TSS segment active on CPU */ \ 57 struct amd64tss *pc_commontssp;/* Common TSS for the CPU */ \ 58 register_t pc_rsp0; \ 59 register_t pc_scratch_rsp; /* User %rsp in syscall */ \ 60 u_int pc_apic_id; \ 61 u_int pc_acpi_id; /* ACPI CPU id */ \ 62 /* Pointer to the CPU %fs descriptor */ \ 63 struct user_segment_descriptor *pc_fs32p; \ 64 /* Pointer to the CPU %gs descriptor */ \ 65 struct user_segment_descriptor *pc_gs32p; \ 66 /* Pointer to the CPU LDT descriptor */ \ 67 struct system_segment_descriptor *pc_ldt; \ 68 /* Pointer to the CPU TSS descriptor */ \ 69 struct system_segment_descriptor *pc_tss; \ 70 uint64_t pc_pm_save_cnt; \ 71 char pc_invpcid_descr[16]; \ 72 u_int pc_cmci_mask; /* MCx banks for CMCI */ \ 73 uint64_t pc_dbreg[16]; /* ddb debugging regs */ \ 74 int pc_dbreg_cmd; /* ddb debugging reg cmd */ \ 75 char __pad[161] /* be divisor of PAGE_SIZE \ 76 after cache alignment */ 77 78 #define PC_DBREG_CMD_NONE 0 79 #define PC_DBREG_CMD_LOAD 1 80 81 #ifdef _KERNEL 82 83 #ifdef lint 84 85 extern struct pcpu *pcpup; 86 87 #define PCPU_GET(member) (pcpup->pc_ ## member) 88 #define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val)) 89 #define PCPU_INC(member) PCPU_ADD(member, 1) 90 #define PCPU_PTR(member) (&pcpup->pc_ ## member) 91 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 92 93 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 94 95 /* 96 * Evaluates to the byte offset of the per-cpu variable name. 97 */ 98 #define __pcpu_offset(name) \ 99 __offsetof(struct pcpu, name) 100 101 /* 102 * Evaluates to the type of the per-cpu variable name. 103 */ 104 #define __pcpu_type(name) \ 105 __typeof(((struct pcpu *)0)->name) 106 107 /* 108 * Evaluates to the address of the per-cpu variable name. 109 */ 110 #define __PCPU_PTR(name) __extension__ ({ \ 111 __pcpu_type(name) *__p; \ 112 \ 113 __asm __volatile("movq %%gs:%1,%0; addq %2,%0" \ 114 : "=r" (__p) \ 115 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 116 "i" (__pcpu_offset(name))); \ 117 \ 118 __p; \ 119 }) 120 121 /* 122 * Evaluates to the value of the per-cpu variable name. 123 */ 124 #define __PCPU_GET(name) __extension__ ({ \ 125 __pcpu_type(name) __res; \ 126 struct __s { \ 127 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 128 } __s; \ 129 \ 130 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 131 sizeof(__res) == 4 || sizeof(__res) == 8) { \ 132 __asm __volatile("mov %%gs:%1,%0" \ 133 : "=r" (__s) \ 134 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 135 *(struct __s *)(void *)&__res = __s; \ 136 } else { \ 137 __res = *__PCPU_PTR(name); \ 138 } \ 139 __res; \ 140 }) 141 142 /* 143 * Adds the value to the per-cpu counter name. The implementation 144 * must be atomic with respect to interrupts. 145 */ 146 #define __PCPU_ADD(name, val) do { \ 147 __pcpu_type(name) __val; \ 148 struct __s { \ 149 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 150 } __s; \ 151 \ 152 __val = (val); \ 153 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 154 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 155 __s = *(struct __s *)(void *)&__val; \ 156 __asm __volatile("add %1,%%gs:%0" \ 157 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 158 : "r" (__s)); \ 159 } else \ 160 *__PCPU_PTR(name) += __val; \ 161 } while (0) 162 163 /* 164 * Increments the value of the per-cpu counter name. The implementation 165 * must be atomic with respect to interrupts. 166 */ 167 #define __PCPU_INC(name) do { \ 168 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 169 sizeof(__pcpu_type(name)) == 2 || \ 170 sizeof(__pcpu_type(name)) == 4 || \ 171 sizeof(__pcpu_type(name)) == 8); \ 172 if (sizeof(__pcpu_type(name)) == 1) { \ 173 __asm __volatile("incb %%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)) == 2) { \ 177 __asm __volatile("incw %%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)) == 4) { \ 181 __asm __volatile("incl %%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)) == 8) { \ 185 __asm __volatile("incq %%gs:%0" \ 186 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 187 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 188 } \ 189 } while (0) 190 191 /* 192 * Sets the value of the per-cpu variable name to value val. 193 */ 194 #define __PCPU_SET(name, val) { \ 195 __pcpu_type(name) __val; \ 196 struct __s { \ 197 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 198 } __s; \ 199 \ 200 __val = (val); \ 201 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 202 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 203 __s = *(struct __s *)(void *)&__val; \ 204 __asm __volatile("mov %1,%%gs:%0" \ 205 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 206 : "r" (__s)); \ 207 } else { \ 208 *__PCPU_PTR(name) = __val; \ 209 } \ 210 } 211 212 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 213 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 214 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 215 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 216 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 217 218 #define OFFSETOF_CURTHREAD 0 219 #ifdef __clang__ 220 #pragma clang diagnostic push 221 #pragma clang diagnostic ignored "-Wnull-dereference" 222 #endif 223 static __inline __pure2 struct thread * 224 __curthread(void) 225 { 226 struct thread *td; 227 228 __asm("movq %%gs:%1,%0" : "=r" (td) 229 : "m" (*(char *)OFFSETOF_CURTHREAD)); 230 return (td); 231 } 232 #ifdef __clang__ 233 #pragma clang diagnostic pop 234 #endif 235 #define curthread (__curthread()) 236 237 #define OFFSETOF_CURPCB 32 238 static __inline __pure2 struct pcb * 239 __curpcb(void) 240 { 241 struct pcb *pcb; 242 243 __asm("movq %%gs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 244 return (pcb); 245 } 246 #define curpcb (__curpcb()) 247 248 #define IS_BSP() (PCPU_GET(cpuid) == 0) 249 250 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 251 252 #error "this file needs to be ported to your compiler" 253 254 #endif /* lint, etc. */ 255 256 #endif /* _KERNEL */ 257 258 #endif /* !_MACHINE_PCPU_H_ */ 259