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 /* 37 * The SMP parts are setup in pmap.c and locore.s for the BSP, and 38 * mp_machdep.c sets up the data for the AP's to "see" when they awake. 39 * The reason for doing it via a struct is so that an array of pointers 40 * to each CPU's data can be set up for things like "check curproc on all 41 * other processors" 42 */ 43 #define PCPU_MD_FIELDS \ 44 char pc_monitorbuf[128] __aligned(128); /* cache line */ \ 45 struct pcpu *pc_prvspace; /* Self-reference */ \ 46 struct pmap *pc_curpmap; \ 47 struct amd64tss *pc_tssp; /* TSS segment active on CPU */ \ 48 struct amd64tss *pc_commontssp;/* Common TSS for the CPU */ \ 49 register_t pc_rsp0; \ 50 register_t pc_scratch_rsp; /* User %rsp in syscall */ \ 51 u_int pc_apic_id; \ 52 u_int pc_acpi_id; /* ACPI CPU id */ \ 53 /* Pointer to the CPU %fs descriptor */ \ 54 struct user_segment_descriptor *pc_fs32p; \ 55 /* Pointer to the CPU %gs descriptor */ \ 56 struct user_segment_descriptor *pc_gs32p; \ 57 /* Pointer to the CPU LDT descriptor */ \ 58 struct system_segment_descriptor *pc_ldt; \ 59 /* Pointer to the CPU TSS descriptor */ \ 60 struct system_segment_descriptor *pc_tss; \ 61 uint64_t pc_pm_save_cnt; \ 62 u_int pc_cmci_mask; /* MCx banks for CMCI */ \ 63 uint64_t pc_dbreg[16]; /* ddb debugging regs */ \ 64 int pc_dbreg_cmd; /* ddb debugging reg cmd */ \ 65 u_int pc_vcpu_id; /* Xen vCPU ID */ \ 66 uint32_t pc_pcid_next; \ 67 uint32_t pc_pcid_gen; \ 68 uint32_t pc_smp_tlb_done; /* TLB op acknowledgement */ \ 69 char __pad[384] /* be divisor of PAGE_SIZE \ 70 after cache alignment */ 71 72 #define PC_DBREG_CMD_NONE 0 73 #define PC_DBREG_CMD_LOAD 1 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("movq %%gs:%1,%0; addq %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(__pcpu_type(name)), 8)]; \ 112 } __s; \ 113 \ 114 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 115 sizeof(__res) == 4 || sizeof(__res) == 8) { \ 116 __asm __volatile("mov %%gs:%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 the value to 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(__pcpu_type(name)), 8)]; \ 134 } __s; \ 135 \ 136 __val = (val); \ 137 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 138 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 139 __s = *(struct __s *)(void *)&__val; \ 140 __asm __volatile("add %1,%%gs:%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 sizeof(__pcpu_type(name)) == 8); \ 156 if (sizeof(__pcpu_type(name)) == 1) { \ 157 __asm __volatile("incb %%gs:%0" \ 158 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 159 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 160 } else if (sizeof(__pcpu_type(name)) == 2) { \ 161 __asm __volatile("incw %%gs:%0" \ 162 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 163 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 164 } else if (sizeof(__pcpu_type(name)) == 4) { \ 165 __asm __volatile("incl %%gs:%0" \ 166 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 167 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 168 } else if (sizeof(__pcpu_type(name)) == 8) { \ 169 __asm __volatile("incq %%gs:%0" \ 170 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 171 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 172 } \ 173 } while (0) 174 175 /* 176 * Sets the value of the per-cpu variable name to value val. 177 */ 178 #define __PCPU_SET(name, val) { \ 179 __pcpu_type(name) __val; \ 180 struct __s { \ 181 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 182 } __s; \ 183 \ 184 __val = (val); \ 185 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 186 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 187 __s = *(struct __s *)(void *)&__val; \ 188 __asm __volatile("mov %1,%%gs:%0" \ 189 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 190 : "r" (__s)); \ 191 } else { \ 192 *__PCPU_PTR(name) = __val; \ 193 } \ 194 } 195 196 #define get_pcpu() __extension__ ({ \ 197 struct pcpu *__pc; \ 198 \ 199 __asm __volatile("movq %%gs:%1,%0" \ 200 : "=r" (__pc) \ 201 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace)))); \ 202 __pc; \ 203 }) 204 205 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 206 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 207 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 208 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 209 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 210 211 #define OFFSETOF_CURTHREAD 0 212 #ifdef __clang__ 213 #pragma clang diagnostic push 214 #pragma clang diagnostic ignored "-Wnull-dereference" 215 #endif 216 static __inline __pure2 struct thread * 217 __curthread(void) 218 { 219 struct thread *td; 220 221 __asm("movq %%gs:%1,%0" : "=r" (td) 222 : "m" (*(char *)OFFSETOF_CURTHREAD)); 223 return (td); 224 } 225 #ifdef __clang__ 226 #pragma clang diagnostic pop 227 #endif 228 #define curthread (__curthread()) 229 230 #define OFFSETOF_CURPCB 32 231 static __inline __pure2 struct pcb * 232 __curpcb(void) 233 { 234 struct pcb *pcb; 235 236 __asm("movq %%gs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 237 return (pcb); 238 } 239 #define curpcb (__curpcb()) 240 241 #define IS_BSP() (PCPU_GET(cpuid) == 0) 242 243 #else /* !__GNUCLIKE_ASM || !__GNUCLIKE___TYPEOF */ 244 245 #error "this file needs to be ported to your compiler" 246 247 #endif /* __GNUCLIKE_ASM && __GNUCLIKE___TYPEOF */ 248 249 #endif /* _KERNEL */ 250 251 #endif /* !_MACHINE_PCPU_H_ */ 252