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 #if defined(XEN) 48 49 /* These are peridically updated in shared_info, and then copied here. */ 50 struct shadow_time_info { 51 uint64_t tsc_timestamp; /* TSC at last update of time vals. */ 52 uint64_t system_timestamp; /* Time, in nanosecs, since boot. */ 53 uint32_t tsc_to_nsec_mul; 54 uint32_t tsc_to_usec_mul; 55 int tsc_shift; 56 uint32_t version; 57 }; 58 59 #define PCPU_XEN_FIELDS \ 60 ; \ 61 u_int pc_cr3; /* track cr3 for R1/R3*/ \ 62 vm_paddr_t *pc_pdir_shadow; \ 63 uint64_t pc_processed_system_time; \ 64 struct shadow_time_info pc_shadow_time; \ 65 char __pad[189] 66 67 #else /* !XEN */ 68 69 #define PCPU_XEN_FIELDS \ 70 ; \ 71 char __pad[237] 72 73 #endif 74 75 #define PCPU_MD_FIELDS \ 76 char pc_monitorbuf[128] __aligned(128); /* cache line */ \ 77 struct pcpu *pc_prvspace; /* Self-reference */ \ 78 struct pmap *pc_curpmap; \ 79 struct i386tss pc_common_tss; \ 80 struct segment_descriptor pc_common_tssd; \ 81 struct segment_descriptor *pc_tss_gdt; \ 82 struct segment_descriptor *pc_fsgs_gdt; \ 83 int pc_currentldt; \ 84 u_int pc_acpi_id; /* ACPI CPU id */ \ 85 u_int pc_apic_id; \ 86 int pc_private_tss; /* Flag indicating private tss*/\ 87 u_int pc_cmci_mask /* MCx banks for CMCI */ \ 88 PCPU_XEN_FIELDS 89 90 #ifdef _KERNEL 91 92 #ifdef lint 93 94 extern struct pcpu *pcpup; 95 96 #define PCPU_GET(member) (pcpup->pc_ ## member) 97 #define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val)) 98 #define PCPU_INC(member) PCPU_ADD(member, 1) 99 #define PCPU_PTR(member) (&pcpup->pc_ ## member) 100 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 101 102 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 103 104 /* 105 * Evaluates to the byte offset of the per-cpu variable name. 106 */ 107 #define __pcpu_offset(name) \ 108 __offsetof(struct pcpu, name) 109 110 /* 111 * Evaluates to the type of the per-cpu variable name. 112 */ 113 #define __pcpu_type(name) \ 114 __typeof(((struct pcpu *)0)->name) 115 116 /* 117 * Evaluates to the address of the per-cpu variable name. 118 */ 119 #define __PCPU_PTR(name) __extension__ ({ \ 120 __pcpu_type(name) *__p; \ 121 \ 122 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \ 123 : "=r" (__p) \ 124 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 125 "i" (__pcpu_offset(name))); \ 126 \ 127 __p; \ 128 }) 129 130 /* 131 * Evaluates to the value of the per-cpu variable name. 132 */ 133 #define __PCPU_GET(name) __extension__ ({ \ 134 __pcpu_type(name) __res; \ 135 struct __s { \ 136 u_char __b[MIN(sizeof(__res), 4)]; \ 137 } __s; \ 138 \ 139 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 140 sizeof(__res) == 4) { \ 141 __asm __volatile("mov %%fs:%1,%0" \ 142 : "=r" (__s) \ 143 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 144 *(struct __s *)(void *)&__res = __s; \ 145 } else { \ 146 __res = *__PCPU_PTR(name); \ 147 } \ 148 __res; \ 149 }) 150 151 /* 152 * Adds a value of the per-cpu counter name. The implementation 153 * must be atomic with respect to interrupts. 154 */ 155 #define __PCPU_ADD(name, val) do { \ 156 __pcpu_type(name) __val; \ 157 struct __s { \ 158 u_char __b[MIN(sizeof(__val), 4)]; \ 159 } __s; \ 160 \ 161 __val = (val); \ 162 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 163 sizeof(__val) == 4) { \ 164 __s = *(struct __s *)(void *)&__val; \ 165 __asm __volatile("add %1,%%fs:%0" \ 166 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 167 : "r" (__s)); \ 168 } else \ 169 *__PCPU_PTR(name) += __val; \ 170 } while (0) 171 172 /* 173 * Increments the value of the per-cpu counter name. The implementation 174 * must be atomic with respect to interrupts. 175 */ 176 #define __PCPU_INC(name) do { \ 177 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 178 sizeof(__pcpu_type(name)) == 2 || \ 179 sizeof(__pcpu_type(name)) == 4); \ 180 if (sizeof(__pcpu_type(name)) == 1) { \ 181 __asm __volatile("incb %%fs:%0" \ 182 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 183 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 184 } else if (sizeof(__pcpu_type(name)) == 2) { \ 185 __asm __volatile("incw %%fs:%0" \ 186 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 187 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 188 } else if (sizeof(__pcpu_type(name)) == 4) { \ 189 __asm __volatile("incl %%fs:%0" \ 190 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 191 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 192 } \ 193 } while (0) 194 195 /* 196 * Sets the value of the per-cpu variable name to value val. 197 */ 198 #define __PCPU_SET(name, val) do { \ 199 __pcpu_type(name) __val; \ 200 struct __s { \ 201 u_char __b[MIN(sizeof(__val), 4)]; \ 202 } __s; \ 203 \ 204 __val = (val); \ 205 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 206 sizeof(__val) == 4) { \ 207 __s = *(struct __s *)(void *)&__val; \ 208 __asm __volatile("mov %1,%%fs:%0" \ 209 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 210 : "r" (__s)); \ 211 } else { \ 212 *__PCPU_PTR(name) = __val; \ 213 } \ 214 } while (0) 215 216 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 217 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 218 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 219 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 220 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 221 222 #define OFFSETOF_CURTHREAD 0 223 #ifdef __clang__ 224 #pragma clang diagnostic push 225 #pragma clang diagnostic ignored "-Wnull-dereference" 226 #endif 227 static __inline __pure2 struct thread * 228 __curthread(void) 229 { 230 struct thread *td; 231 232 __asm("movl %%fs:%1,%0" : "=r" (td) 233 : "m" (*(char *)OFFSETOF_CURTHREAD)); 234 return (td); 235 } 236 #ifdef __clang__ 237 #pragma clang diagnostic pop 238 #endif 239 #define curthread (__curthread()) 240 241 #define OFFSETOF_CURPCB 16 242 static __inline __pure2 struct pcb * 243 __curpcb(void) 244 { 245 struct pcb *pcb; 246 247 __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 248 return (pcb); 249 } 250 #define curpcb (__curpcb()) 251 252 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 253 254 #error "this file needs to be ported to your compiler" 255 256 #endif /* lint, etc. */ 257 258 #endif /* _KERNEL */ 259 260 #endif /* !_MACHINE_PCPU_H_ */ 261