1 /*- 2 * Copyright (c) Peter Wemm 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 #include <machine/segments.h> 37 #include <machine/tss.h> 38 39 /* 40 * The SMP parts are setup in pmap.c and locore.s for the BSP, and 41 * mp_machdep.c sets up the data for the AP's to "see" when they awake. 42 * The reason for doing it via a struct is so that an array of pointers 43 * to each CPU's data can be set up for things like "check curproc on all 44 * other processors" 45 */ 46 47 #define PCPU_MD_FIELDS \ 48 char pc_monitorbuf[128] __aligned(128); /* cache line */ \ 49 struct pcpu *pc_prvspace; /* Self-reference */ \ 50 struct pmap *pc_curpmap; \ 51 struct i386tss pc_common_tss; \ 52 struct segment_descriptor pc_common_tssd; \ 53 struct segment_descriptor *pc_tss_gdt; \ 54 struct segment_descriptor *pc_fsgs_gdt; \ 55 int pc_currentldt; \ 56 u_int pc_acpi_id; /* ACPI CPU id */ \ 57 u_int pc_apic_id; \ 58 int pc_private_tss; /* Flag indicating private tss*/\ 59 u_int pc_cmci_mask; /* MCx banks for CMCI */ \ 60 u_int pc_vcpu_id; /* Xen vCPU ID */ \ 61 char __pad[233] 62 63 #ifdef _KERNEL 64 65 #ifdef lint 66 67 extern struct pcpu *pcpup; 68 69 #define PCPU_GET(member) (pcpup->pc_ ## member) 70 #define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val)) 71 #define PCPU_INC(member) PCPU_ADD(member, 1) 72 #define PCPU_PTR(member) (&pcpup->pc_ ## member) 73 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 74 75 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 76 77 /* 78 * Evaluates to the byte offset of the per-cpu variable name. 79 */ 80 #define __pcpu_offset(name) \ 81 __offsetof(struct pcpu, name) 82 83 /* 84 * Evaluates to the type of the per-cpu variable name. 85 */ 86 #define __pcpu_type(name) \ 87 __typeof(((struct pcpu *)0)->name) 88 89 /* 90 * Evaluates to the address of the per-cpu variable name. 91 */ 92 #define __PCPU_PTR(name) __extension__ ({ \ 93 __pcpu_type(name) *__p; \ 94 \ 95 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \ 96 : "=r" (__p) \ 97 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 98 "i" (__pcpu_offset(name))); \ 99 \ 100 __p; \ 101 }) 102 103 /* 104 * Evaluates to the value of the per-cpu variable name. 105 */ 106 #define __PCPU_GET(name) __extension__ ({ \ 107 __pcpu_type(name) __res; \ 108 struct __s { \ 109 u_char __b[MIN(sizeof(__res), 4)]; \ 110 } __s; \ 111 \ 112 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 113 sizeof(__res) == 4) { \ 114 __asm __volatile("mov %%fs:%1,%0" \ 115 : "=r" (__s) \ 116 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 117 *(struct __s *)(void *)&__res = __s; \ 118 } else { \ 119 __res = *__PCPU_PTR(name); \ 120 } \ 121 __res; \ 122 }) 123 124 /* 125 * Adds a value of the per-cpu counter name. The implementation 126 * must be atomic with respect to interrupts. 127 */ 128 #define __PCPU_ADD(name, val) do { \ 129 __pcpu_type(name) __val; \ 130 struct __s { \ 131 u_char __b[MIN(sizeof(__val), 4)]; \ 132 } __s; \ 133 \ 134 __val = (val); \ 135 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 136 sizeof(__val) == 4) { \ 137 __s = *(struct __s *)(void *)&__val; \ 138 __asm __volatile("add %1,%%fs:%0" \ 139 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 140 : "r" (__s)); \ 141 } else \ 142 *__PCPU_PTR(name) += __val; \ 143 } while (0) 144 145 /* 146 * Increments the value of the per-cpu counter name. The implementation 147 * must be atomic with respect to interrupts. 148 */ 149 #define __PCPU_INC(name) do { \ 150 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 151 sizeof(__pcpu_type(name)) == 2 || \ 152 sizeof(__pcpu_type(name)) == 4); \ 153 if (sizeof(__pcpu_type(name)) == 1) { \ 154 __asm __volatile("incb %%fs:%0" \ 155 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 156 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 157 } else if (sizeof(__pcpu_type(name)) == 2) { \ 158 __asm __volatile("incw %%fs:%0" \ 159 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 160 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 161 } else if (sizeof(__pcpu_type(name)) == 4) { \ 162 __asm __volatile("incl %%fs:%0" \ 163 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 164 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 165 } \ 166 } while (0) 167 168 /* 169 * Sets the value of the per-cpu variable name to value val. 170 */ 171 #define __PCPU_SET(name, val) do { \ 172 __pcpu_type(name) __val; \ 173 struct __s { \ 174 u_char __b[MIN(sizeof(__val), 4)]; \ 175 } __s; \ 176 \ 177 __val = (val); \ 178 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 179 sizeof(__val) == 4) { \ 180 __s = *(struct __s *)(void *)&__val; \ 181 __asm __volatile("mov %1,%%fs:%0" \ 182 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 183 : "r" (__s)); \ 184 } else { \ 185 *__PCPU_PTR(name) = __val; \ 186 } \ 187 } while (0) 188 189 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 190 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 191 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 192 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 193 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 194 195 #define OFFSETOF_CURTHREAD 0 196 #ifdef __clang__ 197 #pragma clang diagnostic push 198 #pragma clang diagnostic ignored "-Wnull-dereference" 199 #endif 200 static __inline __pure2 struct thread * 201 __curthread(void) 202 { 203 struct thread *td; 204 205 __asm("movl %%fs:%1,%0" : "=r" (td) 206 : "m" (*(char *)OFFSETOF_CURTHREAD)); 207 return (td); 208 } 209 #ifdef __clang__ 210 #pragma clang diagnostic pop 211 #endif 212 #define curthread (__curthread()) 213 214 #define OFFSETOF_CURPCB 16 215 static __inline __pure2 struct pcb * 216 __curpcb(void) 217 { 218 struct pcb *pcb; 219 220 __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 221 return (pcb); 222 } 223 #define curpcb (__curpcb()) 224 225 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 226 227 #error "this file needs to be ported to your compiler" 228 229 #endif /* lint, etc. */ 230 231 #endif /* _KERNEL */ 232 233 #endif /* !_MACHINE_PCPU_H_ */ 234