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 int pc_resched_irq; \ 75 int pc_callfunc_irq; \ 76 int pc_virq_to_irq[NR_VIRQS]; \ 77 int pc_ipi_to_irq[NR_IPIS]; \ 78 char __pad[77] 79 80 #elif defined(XENHVM) 81 82 #define PCPU_XEN_FIELDS \ 83 ; \ 84 unsigned int pc_last_processed_l1i; \ 85 unsigned int pc_last_processed_l2i; \ 86 char __pad[229] 87 88 #else /* !XEN && !XENHVM */ 89 90 #define PCPU_XEN_FIELDS \ 91 ; \ 92 char __pad[237] 93 94 #endif 95 96 #define PCPU_MD_FIELDS \ 97 char pc_monitorbuf[128] __aligned(128); /* cache line */ \ 98 struct pcpu *pc_prvspace; /* Self-reference */ \ 99 struct pmap *pc_curpmap; \ 100 struct i386tss pc_common_tss; \ 101 struct segment_descriptor pc_common_tssd; \ 102 struct segment_descriptor *pc_tss_gdt; \ 103 struct segment_descriptor *pc_fsgs_gdt; \ 104 int pc_currentldt; \ 105 u_int pc_acpi_id; /* ACPI CPU id */ \ 106 u_int pc_apic_id; \ 107 int pc_private_tss; /* Flag indicating private tss*/\ 108 u_int pc_cmci_mask /* MCx banks for CMCI */ \ 109 PCPU_XEN_FIELDS 110 111 #ifdef _KERNEL 112 113 #ifdef lint 114 115 extern struct pcpu *pcpup; 116 117 #define PCPU_GET(member) (pcpup->pc_ ## member) 118 #define PCPU_ADD(member, val) (pcpup->pc_ ## member += (val)) 119 #define PCPU_INC(member) PCPU_ADD(member, 1) 120 #define PCPU_PTR(member) (&pcpup->pc_ ## member) 121 #define PCPU_SET(member, val) (pcpup->pc_ ## member = (val)) 122 123 #elif defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) 124 125 /* 126 * Evaluates to the byte offset of the per-cpu variable name. 127 */ 128 #define __pcpu_offset(name) \ 129 __offsetof(struct pcpu, name) 130 131 /* 132 * Evaluates to the type of the per-cpu variable name. 133 */ 134 #define __pcpu_type(name) \ 135 __typeof(((struct pcpu *)0)->name) 136 137 /* 138 * Evaluates to the address of the per-cpu variable name. 139 */ 140 #define __PCPU_PTR(name) __extension__ ({ \ 141 __pcpu_type(name) *__p; \ 142 \ 143 __asm __volatile("movl %%fs:%1,%0; addl %2,%0" \ 144 : "=r" (__p) \ 145 : "m" (*(struct pcpu *)(__pcpu_offset(pc_prvspace))), \ 146 "i" (__pcpu_offset(name))); \ 147 \ 148 __p; \ 149 }) 150 151 /* 152 * Evaluates to the value of the per-cpu variable name. 153 */ 154 #define __PCPU_GET(name) __extension__ ({ \ 155 __pcpu_type(name) __res; \ 156 struct __s { \ 157 u_char __b[MIN(sizeof(__res), 4)]; \ 158 } __s; \ 159 \ 160 if (sizeof(__res) == 1 || sizeof(__res) == 2 || \ 161 sizeof(__res) == 4) { \ 162 __asm __volatile("mov %%fs:%1,%0" \ 163 : "=r" (__s) \ 164 : "m" (*(struct __s *)(__pcpu_offset(name)))); \ 165 *(struct __s *)(void *)&__res = __s; \ 166 } else { \ 167 __res = *__PCPU_PTR(name); \ 168 } \ 169 __res; \ 170 }) 171 172 /* 173 * Adds a value of the per-cpu counter name. The implementation 174 * must be atomic with respect to interrupts. 175 */ 176 #define __PCPU_ADD(name, val) do { \ 177 __pcpu_type(name) __val; \ 178 struct __s { \ 179 u_char __b[MIN(sizeof(__val), 4)]; \ 180 } __s; \ 181 \ 182 __val = (val); \ 183 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 184 sizeof(__val) == 4) { \ 185 __s = *(struct __s *)(void *)&__val; \ 186 __asm __volatile("add %1,%%fs:%0" \ 187 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 188 : "r" (__s)); \ 189 } else \ 190 *__PCPU_PTR(name) += __val; \ 191 } while (0) 192 193 /* 194 * Increments the value of the per-cpu counter name. The implementation 195 * must be atomic with respect to interrupts. 196 */ 197 #define __PCPU_INC(name) do { \ 198 CTASSERT(sizeof(__pcpu_type(name)) == 1 || \ 199 sizeof(__pcpu_type(name)) == 2 || \ 200 sizeof(__pcpu_type(name)) == 4); \ 201 if (sizeof(__pcpu_type(name)) == 1) { \ 202 __asm __volatile("incb %%fs:%0" \ 203 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 204 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 205 } else if (sizeof(__pcpu_type(name)) == 2) { \ 206 __asm __volatile("incw %%fs:%0" \ 207 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 208 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 209 } else if (sizeof(__pcpu_type(name)) == 4) { \ 210 __asm __volatile("incl %%fs:%0" \ 211 : "=m" (*(__pcpu_type(name) *)(__pcpu_offset(name)))\ 212 : "m" (*(__pcpu_type(name) *)(__pcpu_offset(name))));\ 213 } \ 214 } while (0) 215 216 /* 217 * Sets the value of the per-cpu variable name to value val. 218 */ 219 #define __PCPU_SET(name, val) do { \ 220 __pcpu_type(name) __val; \ 221 struct __s { \ 222 u_char __b[MIN(sizeof(__val), 4)]; \ 223 } __s; \ 224 \ 225 __val = (val); \ 226 if (sizeof(__val) == 1 || sizeof(__val) == 2 || \ 227 sizeof(__val) == 4) { \ 228 __s = *(struct __s *)(void *)&__val; \ 229 __asm __volatile("mov %1,%%fs:%0" \ 230 : "=m" (*(struct __s *)(__pcpu_offset(name))) \ 231 : "r" (__s)); \ 232 } else { \ 233 *__PCPU_PTR(name) = __val; \ 234 } \ 235 } while (0) 236 237 #define PCPU_GET(member) __PCPU_GET(pc_ ## member) 238 #define PCPU_ADD(member, val) __PCPU_ADD(pc_ ## member, val) 239 #define PCPU_INC(member) __PCPU_INC(pc_ ## member) 240 #define PCPU_PTR(member) __PCPU_PTR(pc_ ## member) 241 #define PCPU_SET(member, val) __PCPU_SET(pc_ ## member, val) 242 243 #define OFFSETOF_CURTHREAD 0 244 #ifdef __clang__ 245 #pragma clang diagnostic push 246 #pragma clang diagnostic ignored "-Wnull-dereference" 247 #endif 248 static __inline __pure2 struct thread * 249 __curthread(void) 250 { 251 struct thread *td; 252 253 __asm("movl %%fs:%1,%0" : "=r" (td) 254 : "m" (*(char *)OFFSETOF_CURTHREAD)); 255 return (td); 256 } 257 #ifdef __clang__ 258 #pragma clang diagnostic pop 259 #endif 260 #define curthread (__curthread()) 261 262 #define OFFSETOF_CURPCB 16 263 static __inline __pure2 struct pcb * 264 __curpcb(void) 265 { 266 struct pcb *pcb; 267 268 __asm("movl %%fs:%1,%0" : "=r" (pcb) : "m" (*(char *)OFFSETOF_CURPCB)); 269 return (pcb); 270 } 271 #define curpcb (__curpcb()) 272 273 #else /* !lint || defined(__GNUCLIKE_ASM) && defined(__GNUCLIKE___TYPEOF) */ 274 275 #error "this file needs to be ported to your compiler" 276 277 #endif /* lint, etc. */ 278 279 #endif /* _KERNEL */ 280 281 #endif /* !_MACHINE_PCPU_H_ */ 282