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) || defined(XENHVM) 48 #ifndef NR_VIRQS 49 #define NR_VIRQS 24 50 #endif 51 #ifndef NR_IPIS 52 #define NR_IPIS 2 53 #endif 54 #endif 55 56 #if defined(XEN) 57 58 /* These are peridically updated in shared_info, and then copied here. */ 59 struct shadow_time_info { 60 uint64_t tsc_timestamp; /* TSC at last update of time vals. */ 61 uint64_t system_timestamp; /* Time, in nanosecs, since boot. */ 62 uint32_t tsc_to_nsec_mul; 63 uint32_t tsc_to_usec_mul; 64 int tsc_shift; 65 uint32_t version; 66 }; 67 68 #define PCPU_XEN_FIELDS \ 69 ; \ 70 u_int pc_cr3; /* track cr3 for R1/R3*/ \ 71 vm_paddr_t *pc_pdir_shadow; \ 72 uint64_t pc_processed_system_time; \ 73 struct shadow_time_info pc_shadow_time; \ 74 char __pad[189] 75 76 #else /* !XEN */ 77 78 #define PCPU_XEN_FIELDS \ 79 ; \ 80 char __pad[237] 81 82 #endif 83 84 #define PCPU_MD_FIELDS \ 85 char pc_monitorbuf[128] __aligned(128); /* cache line */ \ 86 struct pcpu *pc_prvspace; /* Self-reference */ \ 87 struct pmap *pc_curpmap; \ 88 struct i386tss pc_common_tss; \ 89 struct segment_descriptor pc_common_tssd; \ 90 struct segment_descriptor *pc_tss_gdt; \ 91 struct segment_descriptor *pc_fsgs_gdt; \ 92 int pc_currentldt; \ 93 u_int pc_acpi_id; /* ACPI CPU id */ \ 94 u_int pc_apic_id; \ 95 int pc_private_tss; /* Flag indicating private tss*/\ 96 u_int pc_cmci_mask /* MCx banks for CMCI */ \ 97 PCPU_XEN_FIELDS 98 99 #ifdef _KERNEL 100 101 #ifdef lint 102 103 extern struct pcpu *pcpup; 104 105 #define PCPU_GET(member) (pcpup->pc_ ## member) 106 #define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val)) 107 #define PCPU_INC(member) PCPU_ADD(member, 1) 108 #define PCPU_PTR(member) (&pcpup->pc_ ## member) 109 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 110 111 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 112 113 /* 114 * Evaluates to the byte offset of the per-cpu variable name. 115 */ 116 #define __pcpu_offset(name) \ 117 __offsetof(struct pcpu, name) 118 119 /* 120 * Evaluates to the type of the per-cpu variable name. 121 */ 122 #define __pcpu_type(name) \ 123 __typeof(((struct pcpu *)0)->name) 124 125 /* 126 * Evaluates to the address of the per-cpu variable name. 127 */ 128 #define __PCPU_PTR(name) __extension__ ({ \ 129 __pcpu_type(name) *__p; \ 130 \ 131 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \ 132 : "=r" (__p) \ 133 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 134 "i" (__pcpu_offset(name))); \ 135 \ 136 __p; \ 137 }) 138 139 /* 140 * Evaluates to the value of the per-cpu variable name. 141 */ 142 #define __PCPU_GET(name) __extension__ ({ \ 143 __pcpu_type(name) __res; \ 144 struct __s { \ 145 u_char __b[MIN(sizeof(__res), 4)]; \ 146 } __s; \ 147 \ 148 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 149 sizeof(__res) == 4) { \ 150 __asm __volatile("mov %%fs:%1,%0" \ 151 : "=r" (__s) \ 152 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 153 *(struct __s *)(void *)&__res = __s; \ 154 } else { \ 155 __res = *__PCPU_PTR(name); \ 156 } \ 157 __res; \ 158 }) 159 160 /* 161 * Adds a value of the per-cpu counter name. The implementation 162 * must be atomic with respect to interrupts. 163 */ 164 #define __PCPU_ADD(name, val) do { \ 165 __pcpu_type(name) __val; \ 166 struct __s { \ 167 u_char __b[MIN(sizeof(__val), 4)]; \ 168 } __s; \ 169 \ 170 __val = (val); \ 171 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 172 sizeof(__val) == 4) { \ 173 __s = *(struct __s *)(void *)&__val; \ 174 __asm __volatile("add %1,%%fs:%0" \ 175 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 176 : "r" (__s)); \ 177 } else \ 178 *__PCPU_PTR(name) += __val; \ 179 } while (0) 180 181 /* 182 * Increments the value of the per-cpu counter name. The implementation 183 * must be atomic with respect to interrupts. 184 */ 185 #define __PCPU_INC(name) do { \ 186 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 187 sizeof(__pcpu_type(name)) == 2 || \ 188 sizeof(__pcpu_type(name)) == 4); \ 189 if (sizeof(__pcpu_type(name)) == 1) { \ 190 __asm __volatile("incb %%fs:%0" \ 191 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 192 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 193 } else if (sizeof(__pcpu_type(name)) == 2) { \ 194 __asm __volatile("incw %%fs:%0" \ 195 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 196 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 197 } else if (sizeof(__pcpu_type(name)) == 4) { \ 198 __asm __volatile("incl %%fs:%0" \ 199 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 200 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 201 } \ 202 } while (0) 203 204 /* 205 * Sets the value of the per-cpu variable name to value val. 206 */ 207 #define __PCPU_SET(name, val) do { \ 208 __pcpu_type(name) __val; \ 209 struct __s { \ 210 u_char __b[MIN(sizeof(__val), 4)]; \ 211 } __s; \ 212 \ 213 __val = (val); \ 214 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 215 sizeof(__val) == 4) { \ 216 __s = *(struct __s *)(void *)&__val; \ 217 __asm __volatile("mov %1,%%fs:%0" \ 218 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 219 : "r" (__s)); \ 220 } else { \ 221 *__PCPU_PTR(name) = __val; \ 222 } \ 223 } while (0) 224 225 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 226 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 227 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 228 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 229 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 230 231 #define OFFSETOF_CURTHREAD 0 232 #ifdef __clang__ 233 #pragma clang diagnostic push 234 #pragma clang diagnostic ignored "-Wnull-dereference" 235 #endif 236 static __inline __pure2 struct thread * 237 __curthread(void) 238 { 239 struct thread *td; 240 241 __asm("movl %%fs:%1,%0" : "=r" (td) 242 : "m" (*(char *)OFFSETOF_CURTHREAD)); 243 return (td); 244 } 245 #ifdef __clang__ 246 #pragma clang diagnostic pop 247 #endif 248 #define curthread (__curthread()) 249 250 #define OFFSETOF_CURPCB 16 251 static __inline __pure2 struct pcb * 252 __curpcb(void) 253 { 254 struct pcb *pcb; 255 256 __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 257 return (pcb); 258 } 259 #define curpcb (__curpcb()) 260 261 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 262 263 #error "this file needs to be ported to your compiler" 264 265 #endif /* lint, etc. */ 266 267 #endif /* _KERNEL */ 268 269 #endif /* !_MACHINE_PCPU_H_ */ 270