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 char __pad[157] /* be divisor of PAGE_SIZE \ 67 after cache alignment */ 68 69#define PC_DBREG_CMD_NONE 0 70#define PC_DBREG_CMD_LOAD 1 71 72#ifdef _KERNEL 73 74#ifdef lint 75 76extern struct pcpu *pcpup; 77 78#define PCPU_GET(member) (pcpup->pc_ ## member) 79#define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val)) 80#define PCPU_INC(member) PCPU_ADD(member, 1) 81#define PCPU_PTR(member) (&pcpup->pc_ ## member) 82#define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 83 84#elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 85 86/* 87 * Evaluates to the byte offset of the per-cpu variable name. 88 */ 89#define __pcpu_offset(name) \ 90 __offsetof(struct pcpu, name) 91 92/* 93 * Evaluates to the type of the per-cpu variable name. 94 */ 95#define __pcpu_type(name) \ 96 __typeof(((struct pcpu *)0)->name) 97 98/* 99 * Evaluates to the address of the per-cpu variable name. 100 */ 101#define __PCPU_PTR(name) __extension__ ({ \ 102 __pcpu_type(name) *__p; \ 103 \ 104 __asm __volatile("movq %%gs:%1,%0; addq %2,%0" \ 105 : "=r" (__p) \ 106 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 107 "i" (__pcpu_offset(name))); \ 108 \ 109 __p; \ 110}) 111 112/* 113 * Evaluates to the value of the per-cpu variable name. 114 */ 115#define __PCPU_GET(name) __extension__ ({ \ 116 __pcpu_type(name) __res; \ 117 struct __s { \ 118 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 119 } __s; \ 120 \ 121 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 122 sizeof(__res) == 4 || sizeof(__res) == 8) { \ 123 __asm __volatile("mov %%gs:%1,%0" \ 124 : "=r" (__s) \ 125 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 126 *(struct __s *)(void *)&__res = __s; \ 127 } else { \ 128 __res = *__PCPU_PTR(name); \ 129 } \ 130 __res; \ 131}) 132 133/* 134 * Adds the value to the per-cpu counter name. The implementation 135 * must be atomic with respect to interrupts. 136 */ 137#define __PCPU_ADD(name, val) do { \ 138 __pcpu_type(name) __val; \ 139 struct __s { \ 140 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 141 } __s; \ 142 \ 143 __val = (val); \ 144 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 145 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 146 __s = *(struct __s *)(void *)&__val; \ 147 __asm __volatile("add %1,%%gs:%0" \ 148 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 149 : "r" (__s)); \ 150 } else \ 151 *__PCPU_PTR(name) += __val; \ 152} while (0) 153 154/* 155 * Increments the value of the per-cpu counter name. The implementation 156 * must be atomic with respect to interrupts. 157 */ 158#define __PCPU_INC(name) do { \ 159 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 160 sizeof(__pcpu_type(name)) == 2 || \ 161 sizeof(__pcpu_type(name)) == 4 || \ 162 sizeof(__pcpu_type(name)) == 8); \ 163 if (sizeof(__pcpu_type(name)) == 1) { \ 164 __asm __volatile("incb %%gs:%0" \ 165 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 166 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 167 } else if (sizeof(__pcpu_type(name)) == 2) { \ 168 __asm __volatile("incw %%gs:%0" \ 169 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 170 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 171 } else if (sizeof(__pcpu_type(name)) == 4) { \ 172 __asm __volatile("incl %%gs:%0" \ 173 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 174 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 175 } else if (sizeof(__pcpu_type(name)) == 8) { \ 176 __asm __volatile("incq %%gs:%0" \ 177 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 178 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 179 } \ 180} while (0) 181 182/* 183 * Sets the value of the per-cpu variable name to value val. 184 */ 185#define __PCPU_SET(name, val) { \ 186 __pcpu_type(name) __val; \ 187 struct __s { \ 188 u_char __b[MIN(sizeof(__pcpu_type(name)), 8)]; \ 189 } __s; \ 190 \ 191 __val = (val); \ 192 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 193 sizeof(__val) == 4 || sizeof(__val) == 8) { \ 194 __s = *(struct __s *)(void *)&__val; \ 195 __asm __volatile("mov %1,%%gs:%0" \ 196 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 197 : "r" (__s)); \ 198 } else { \ 199 *__PCPU_PTR(name) = __val; \ 200 } \ 201} 202 203#define PCPU_GET(member) __PCPU_GET(pc_ ## member) 204#define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 205#define PCPU_INC(member) __PCPU_INC(pc_ ## member) 206#define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 207#define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 208 209#define OFFSETOF_CURTHREAD 0 210#ifdef __clang__ 211#pragma clang diagnostic push 212#pragma clang diagnostic ignored "-Wnull-dereference" 213#endif 214static __inline __pure2 struct thread * 215__curthread(void) 216{ 217 struct thread *td; 218 219 __asm("movq %%gs:%1,%0" : "=r" (td) 220 : "m" (*(char *)OFFSETOF_CURTHREAD)); 221 return (td); 222} 223#ifdef __clang__ 224#pragma clang diagnostic pop 225#endif 226#define curthread (__curthread()) 227 228#define OFFSETOF_CURPCB 32 229static __inline __pure2 struct pcb * 230__curpcb(void) 231{ 232 struct pcb *pcb; 233 234 __asm("movq %%gs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 235 return (pcb); 236} 237#define curpcb (__curpcb()) 238 239#define IS_BSP() (PCPU_GET(cpuid) == 0) 240 241#else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 242 243#error "this file needs to be ported to your compiler" 244 245#endif /* lint, etc. */ 246 247#endif /* _KERNEL */ 248 249#endif /* !_MACHINE_PCPU_H_ */ 250