1 #ifndef _ASM_X86_PERCPU_H 2 #define _ASM_X86_PERCPU_H 3 4 #ifdef CONFIG_X86_64 5 #define __percpu_seg gs 6 #define __percpu_mov_op movq 7 #else 8 #define __percpu_seg fs 9 #define __percpu_mov_op movl 10 #endif 11 12 #ifdef __ASSEMBLY__ 13 14 /* 15 * PER_CPU finds an address of a per-cpu variable. 16 * 17 * Args: 18 * var - variable name 19 * reg - 32bit register 20 * 21 * The resulting address is stored in the "reg" argument. 22 * 23 * Example: 24 * PER_CPU(cpu_gdt_descr, %ebx) 25 */ 26 #ifdef CONFIG_SMP 27 #define PER_CPU(var, reg) \ 28 __percpu_mov_op %__percpu_seg:this_cpu_off, reg; \ 29 lea var(reg), reg 30 #define PER_CPU_VAR(var) %__percpu_seg:var 31 #else /* ! SMP */ 32 #define PER_CPU(var, reg) __percpu_mov_op $var, reg 33 #define PER_CPU_VAR(var) var 34 #endif /* SMP */ 35 36 #ifdef CONFIG_X86_64_SMP 37 #define INIT_PER_CPU_VAR(var) init_per_cpu__##var 38 #else 39 #define INIT_PER_CPU_VAR(var) var 40 #endif 41 42 #else /* ...!ASSEMBLY */ 43 44 #include <linux/kernel.h> 45 #include <linux/stringify.h> 46 47 #ifdef CONFIG_SMP 48 #define __percpu_prefix "%%"__stringify(__percpu_seg)":" 49 #define __my_cpu_offset this_cpu_read(this_cpu_off) 50 51 /* 52 * Compared to the generic __my_cpu_offset version, the following 53 * saves one instruction and avoids clobbering a temp register. 54 */ 55 #define arch_raw_cpu_ptr(ptr) \ 56 ({ \ 57 unsigned long tcp_ptr__; \ 58 asm volatile("add " __percpu_arg(1) ", %0" \ 59 : "=r" (tcp_ptr__) \ 60 : "m" (this_cpu_off), "0" (ptr)); \ 61 (typeof(*(ptr)) __kernel __force *)tcp_ptr__; \ 62 }) 63 #else 64 #define __percpu_prefix "" 65 #endif 66 67 #define __percpu_arg(x) __percpu_prefix "%" #x 68 69 /* 70 * Initialized pointers to per-cpu variables needed for the boot 71 * processor need to use these macros to get the proper address 72 * offset from __per_cpu_load on SMP. 73 * 74 * There also must be an entry in vmlinux_64.lds.S 75 */ 76 #define DECLARE_INIT_PER_CPU(var) \ 77 extern typeof(var) init_per_cpu_var(var) 78 79 #ifdef CONFIG_X86_64_SMP 80 #define init_per_cpu_var(var) init_per_cpu__##var 81 #else 82 #define init_per_cpu_var(var) var 83 #endif 84 85 /* For arch-specific code, we can use direct single-insn ops (they 86 * don't give an lvalue though). */ 87 extern void __bad_percpu_size(void); 88 89 #define percpu_to_op(op, var, val) \ 90 do { \ 91 typedef typeof(var) pto_T__; \ 92 if (0) { \ 93 pto_T__ pto_tmp__; \ 94 pto_tmp__ = (val); \ 95 (void)pto_tmp__; \ 96 } \ 97 switch (sizeof(var)) { \ 98 case 1: \ 99 asm(op "b %1,"__percpu_arg(0) \ 100 : "+m" (var) \ 101 : "qi" ((pto_T__)(val))); \ 102 break; \ 103 case 2: \ 104 asm(op "w %1,"__percpu_arg(0) \ 105 : "+m" (var) \ 106 : "ri" ((pto_T__)(val))); \ 107 break; \ 108 case 4: \ 109 asm(op "l %1,"__percpu_arg(0) \ 110 : "+m" (var) \ 111 : "ri" ((pto_T__)(val))); \ 112 break; \ 113 case 8: \ 114 asm(op "q %1,"__percpu_arg(0) \ 115 : "+m" (var) \ 116 : "re" ((pto_T__)(val))); \ 117 break; \ 118 default: __bad_percpu_size(); \ 119 } \ 120 } while (0) 121 122 /* 123 * Generate a percpu add to memory instruction and optimize code 124 * if one is added or subtracted. 125 */ 126 #define percpu_add_op(var, val) \ 127 do { \ 128 typedef typeof(var) pao_T__; \ 129 const int pao_ID__ = (__builtin_constant_p(val) && \ 130 ((val) == 1 || (val) == -1)) ? \ 131 (int)(val) : 0; \ 132 if (0) { \ 133 pao_T__ pao_tmp__; \ 134 pao_tmp__ = (val); \ 135 (void)pao_tmp__; \ 136 } \ 137 switch (sizeof(var)) { \ 138 case 1: \ 139 if (pao_ID__ == 1) \ 140 asm("incb "__percpu_arg(0) : "+m" (var)); \ 141 else if (pao_ID__ == -1) \ 142 asm("decb "__percpu_arg(0) : "+m" (var)); \ 143 else \ 144 asm("addb %1, "__percpu_arg(0) \ 145 : "+m" (var) \ 146 : "qi" ((pao_T__)(val))); \ 147 break; \ 148 case 2: \ 149 if (pao_ID__ == 1) \ 150 asm("incw "__percpu_arg(0) : "+m" (var)); \ 151 else if (pao_ID__ == -1) \ 152 asm("decw "__percpu_arg(0) : "+m" (var)); \ 153 else \ 154 asm("addw %1, "__percpu_arg(0) \ 155 : "+m" (var) \ 156 : "ri" ((pao_T__)(val))); \ 157 break; \ 158 case 4: \ 159 if (pao_ID__ == 1) \ 160 asm("incl "__percpu_arg(0) : "+m" (var)); \ 161 else if (pao_ID__ == -1) \ 162 asm("decl "__percpu_arg(0) : "+m" (var)); \ 163 else \ 164 asm("addl %1, "__percpu_arg(0) \ 165 : "+m" (var) \ 166 : "ri" ((pao_T__)(val))); \ 167 break; \ 168 case 8: \ 169 if (pao_ID__ == 1) \ 170 asm("incq "__percpu_arg(0) : "+m" (var)); \ 171 else if (pao_ID__ == -1) \ 172 asm("decq "__percpu_arg(0) : "+m" (var)); \ 173 else \ 174 asm("addq %1, "__percpu_arg(0) \ 175 : "+m" (var) \ 176 : "re" ((pao_T__)(val))); \ 177 break; \ 178 default: __bad_percpu_size(); \ 179 } \ 180 } while (0) 181 182 #define percpu_from_op(op, var) \ 183 ({ \ 184 typeof(var) pfo_ret__; \ 185 switch (sizeof(var)) { \ 186 case 1: \ 187 asm(op "b "__percpu_arg(1)",%0" \ 188 : "=q" (pfo_ret__) \ 189 : "m" (var)); \ 190 break; \ 191 case 2: \ 192 asm(op "w "__percpu_arg(1)",%0" \ 193 : "=r" (pfo_ret__) \ 194 : "m" (var)); \ 195 break; \ 196 case 4: \ 197 asm(op "l "__percpu_arg(1)",%0" \ 198 : "=r" (pfo_ret__) \ 199 : "m" (var)); \ 200 break; \ 201 case 8: \ 202 asm(op "q "__percpu_arg(1)",%0" \ 203 : "=r" (pfo_ret__) \ 204 : "m" (var)); \ 205 break; \ 206 default: __bad_percpu_size(); \ 207 } \ 208 pfo_ret__; \ 209 }) 210 211 #define percpu_stable_op(op, var) \ 212 ({ \ 213 typeof(var) pfo_ret__; \ 214 switch (sizeof(var)) { \ 215 case 1: \ 216 asm(op "b "__percpu_arg(P1)",%0" \ 217 : "=q" (pfo_ret__) \ 218 : "p" (&(var))); \ 219 break; \ 220 case 2: \ 221 asm(op "w "__percpu_arg(P1)",%0" \ 222 : "=r" (pfo_ret__) \ 223 : "p" (&(var))); \ 224 break; \ 225 case 4: \ 226 asm(op "l "__percpu_arg(P1)",%0" \ 227 : "=r" (pfo_ret__) \ 228 : "p" (&(var))); \ 229 break; \ 230 case 8: \ 231 asm(op "q "__percpu_arg(P1)",%0" \ 232 : "=r" (pfo_ret__) \ 233 : "p" (&(var))); \ 234 break; \ 235 default: __bad_percpu_size(); \ 236 } \ 237 pfo_ret__; \ 238 }) 239 240 #define percpu_unary_op(op, var) \ 241 ({ \ 242 switch (sizeof(var)) { \ 243 case 1: \ 244 asm(op "b "__percpu_arg(0) \ 245 : "+m" (var)); \ 246 break; \ 247 case 2: \ 248 asm(op "w "__percpu_arg(0) \ 249 : "+m" (var)); \ 250 break; \ 251 case 4: \ 252 asm(op "l "__percpu_arg(0) \ 253 : "+m" (var)); \ 254 break; \ 255 case 8: \ 256 asm(op "q "__percpu_arg(0) \ 257 : "+m" (var)); \ 258 break; \ 259 default: __bad_percpu_size(); \ 260 } \ 261 }) 262 263 /* 264 * Add return operation 265 */ 266 #define percpu_add_return_op(var, val) \ 267 ({ \ 268 typeof(var) paro_ret__ = val; \ 269 switch (sizeof(var)) { \ 270 case 1: \ 271 asm("xaddb %0, "__percpu_arg(1) \ 272 : "+q" (paro_ret__), "+m" (var) \ 273 : : "memory"); \ 274 break; \ 275 case 2: \ 276 asm("xaddw %0, "__percpu_arg(1) \ 277 : "+r" (paro_ret__), "+m" (var) \ 278 : : "memory"); \ 279 break; \ 280 case 4: \ 281 asm("xaddl %0, "__percpu_arg(1) \ 282 : "+r" (paro_ret__), "+m" (var) \ 283 : : "memory"); \ 284 break; \ 285 case 8: \ 286 asm("xaddq %0, "__percpu_arg(1) \ 287 : "+re" (paro_ret__), "+m" (var) \ 288 : : "memory"); \ 289 break; \ 290 default: __bad_percpu_size(); \ 291 } \ 292 paro_ret__ += val; \ 293 paro_ret__; \ 294 }) 295 296 /* 297 * xchg is implemented using cmpxchg without a lock prefix. xchg is 298 * expensive due to the implied lock prefix. The processor cannot prefetch 299 * cachelines if xchg is used. 300 */ 301 #define percpu_xchg_op(var, nval) \ 302 ({ \ 303 typeof(var) pxo_ret__; \ 304 typeof(var) pxo_new__ = (nval); \ 305 switch (sizeof(var)) { \ 306 case 1: \ 307 asm("\n\tmov "__percpu_arg(1)",%%al" \ 308 "\n1:\tcmpxchgb %2, "__percpu_arg(1) \ 309 "\n\tjnz 1b" \ 310 : "=&a" (pxo_ret__), "+m" (var) \ 311 : "q" (pxo_new__) \ 312 : "memory"); \ 313 break; \ 314 case 2: \ 315 asm("\n\tmov "__percpu_arg(1)",%%ax" \ 316 "\n1:\tcmpxchgw %2, "__percpu_arg(1) \ 317 "\n\tjnz 1b" \ 318 : "=&a" (pxo_ret__), "+m" (var) \ 319 : "r" (pxo_new__) \ 320 : "memory"); \ 321 break; \ 322 case 4: \ 323 asm("\n\tmov "__percpu_arg(1)",%%eax" \ 324 "\n1:\tcmpxchgl %2, "__percpu_arg(1) \ 325 "\n\tjnz 1b" \ 326 : "=&a" (pxo_ret__), "+m" (var) \ 327 : "r" (pxo_new__) \ 328 : "memory"); \ 329 break; \ 330 case 8: \ 331 asm("\n\tmov "__percpu_arg(1)",%%rax" \ 332 "\n1:\tcmpxchgq %2, "__percpu_arg(1) \ 333 "\n\tjnz 1b" \ 334 : "=&a" (pxo_ret__), "+m" (var) \ 335 : "r" (pxo_new__) \ 336 : "memory"); \ 337 break; \ 338 default: __bad_percpu_size(); \ 339 } \ 340 pxo_ret__; \ 341 }) 342 343 /* 344 * cmpxchg has no such implied lock semantics as a result it is much 345 * more efficient for cpu local operations. 346 */ 347 #define percpu_cmpxchg_op(var, oval, nval) \ 348 ({ \ 349 typeof(var) pco_ret__; \ 350 typeof(var) pco_old__ = (oval); \ 351 typeof(var) pco_new__ = (nval); \ 352 switch (sizeof(var)) { \ 353 case 1: \ 354 asm("cmpxchgb %2, "__percpu_arg(1) \ 355 : "=a" (pco_ret__), "+m" (var) \ 356 : "q" (pco_new__), "0" (pco_old__) \ 357 : "memory"); \ 358 break; \ 359 case 2: \ 360 asm("cmpxchgw %2, "__percpu_arg(1) \ 361 : "=a" (pco_ret__), "+m" (var) \ 362 : "r" (pco_new__), "0" (pco_old__) \ 363 : "memory"); \ 364 break; \ 365 case 4: \ 366 asm("cmpxchgl %2, "__percpu_arg(1) \ 367 : "=a" (pco_ret__), "+m" (var) \ 368 : "r" (pco_new__), "0" (pco_old__) \ 369 : "memory"); \ 370 break; \ 371 case 8: \ 372 asm("cmpxchgq %2, "__percpu_arg(1) \ 373 : "=a" (pco_ret__), "+m" (var) \ 374 : "r" (pco_new__), "0" (pco_old__) \ 375 : "memory"); \ 376 break; \ 377 default: __bad_percpu_size(); \ 378 } \ 379 pco_ret__; \ 380 }) 381 382 /* 383 * this_cpu_read() makes gcc load the percpu variable every time it is 384 * accessed while this_cpu_read_stable() allows the value to be cached. 385 * this_cpu_read_stable() is more efficient and can be used if its value 386 * is guaranteed to be valid across cpus. The current users include 387 * get_current() and get_thread_info() both of which are actually 388 * per-thread variables implemented as per-cpu variables and thus 389 * stable for the duration of the respective task. 390 */ 391 #define this_cpu_read_stable(var) percpu_stable_op("mov", var) 392 393 #define raw_cpu_read_1(pcp) percpu_from_op("mov", pcp) 394 #define raw_cpu_read_2(pcp) percpu_from_op("mov", pcp) 395 #define raw_cpu_read_4(pcp) percpu_from_op("mov", pcp) 396 397 #define raw_cpu_write_1(pcp, val) percpu_to_op("mov", (pcp), val) 398 #define raw_cpu_write_2(pcp, val) percpu_to_op("mov", (pcp), val) 399 #define raw_cpu_write_4(pcp, val) percpu_to_op("mov", (pcp), val) 400 #define raw_cpu_add_1(pcp, val) percpu_add_op((pcp), val) 401 #define raw_cpu_add_2(pcp, val) percpu_add_op((pcp), val) 402 #define raw_cpu_add_4(pcp, val) percpu_add_op((pcp), val) 403 #define raw_cpu_and_1(pcp, val) percpu_to_op("and", (pcp), val) 404 #define raw_cpu_and_2(pcp, val) percpu_to_op("and", (pcp), val) 405 #define raw_cpu_and_4(pcp, val) percpu_to_op("and", (pcp), val) 406 #define raw_cpu_or_1(pcp, val) percpu_to_op("or", (pcp), val) 407 #define raw_cpu_or_2(pcp, val) percpu_to_op("or", (pcp), val) 408 #define raw_cpu_or_4(pcp, val) percpu_to_op("or", (pcp), val) 409 #define raw_cpu_xchg_1(pcp, val) percpu_xchg_op(pcp, val) 410 #define raw_cpu_xchg_2(pcp, val) percpu_xchg_op(pcp, val) 411 #define raw_cpu_xchg_4(pcp, val) percpu_xchg_op(pcp, val) 412 413 #define this_cpu_read_1(pcp) percpu_from_op("mov", pcp) 414 #define this_cpu_read_2(pcp) percpu_from_op("mov", pcp) 415 #define this_cpu_read_4(pcp) percpu_from_op("mov", pcp) 416 #define this_cpu_write_1(pcp, val) percpu_to_op("mov", (pcp), val) 417 #define this_cpu_write_2(pcp, val) percpu_to_op("mov", (pcp), val) 418 #define this_cpu_write_4(pcp, val) percpu_to_op("mov", (pcp), val) 419 #define this_cpu_add_1(pcp, val) percpu_add_op((pcp), val) 420 #define this_cpu_add_2(pcp, val) percpu_add_op((pcp), val) 421 #define this_cpu_add_4(pcp, val) percpu_add_op((pcp), val) 422 #define this_cpu_and_1(pcp, val) percpu_to_op("and", (pcp), val) 423 #define this_cpu_and_2(pcp, val) percpu_to_op("and", (pcp), val) 424 #define this_cpu_and_4(pcp, val) percpu_to_op("and", (pcp), val) 425 #define this_cpu_or_1(pcp, val) percpu_to_op("or", (pcp), val) 426 #define this_cpu_or_2(pcp, val) percpu_to_op("or", (pcp), val) 427 #define this_cpu_or_4(pcp, val) percpu_to_op("or", (pcp), val) 428 #define this_cpu_xchg_1(pcp, nval) percpu_xchg_op(pcp, nval) 429 #define this_cpu_xchg_2(pcp, nval) percpu_xchg_op(pcp, nval) 430 #define this_cpu_xchg_4(pcp, nval) percpu_xchg_op(pcp, nval) 431 432 #define raw_cpu_add_return_1(pcp, val) percpu_add_return_op(pcp, val) 433 #define raw_cpu_add_return_2(pcp, val) percpu_add_return_op(pcp, val) 434 #define raw_cpu_add_return_4(pcp, val) percpu_add_return_op(pcp, val) 435 #define raw_cpu_cmpxchg_1(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval) 436 #define raw_cpu_cmpxchg_2(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval) 437 #define raw_cpu_cmpxchg_4(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval) 438 439 #define this_cpu_add_return_1(pcp, val) percpu_add_return_op(pcp, val) 440 #define this_cpu_add_return_2(pcp, val) percpu_add_return_op(pcp, val) 441 #define this_cpu_add_return_4(pcp, val) percpu_add_return_op(pcp, val) 442 #define this_cpu_cmpxchg_1(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval) 443 #define this_cpu_cmpxchg_2(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval) 444 #define this_cpu_cmpxchg_4(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval) 445 446 #ifdef CONFIG_X86_CMPXCHG64 447 #define percpu_cmpxchg8b_double(pcp1, pcp2, o1, o2, n1, n2) \ 448 ({ \ 449 bool __ret; \ 450 typeof(pcp1) __o1 = (o1), __n1 = (n1); \ 451 typeof(pcp2) __o2 = (o2), __n2 = (n2); \ 452 asm volatile("cmpxchg8b "__percpu_arg(1)"\n\tsetz %0\n\t" \ 453 : "=a" (__ret), "+m" (pcp1), "+m" (pcp2), "+d" (__o2) \ 454 : "b" (__n1), "c" (__n2), "a" (__o1)); \ 455 __ret; \ 456 }) 457 458 #define raw_cpu_cmpxchg_double_4 percpu_cmpxchg8b_double 459 #define this_cpu_cmpxchg_double_4 percpu_cmpxchg8b_double 460 #endif /* CONFIG_X86_CMPXCHG64 */ 461 462 /* 463 * Per cpu atomic 64 bit operations are only available under 64 bit. 464 * 32 bit must fall back to generic operations. 465 */ 466 #ifdef CONFIG_X86_64 467 #define raw_cpu_read_8(pcp) percpu_from_op("mov", pcp) 468 #define raw_cpu_write_8(pcp, val) percpu_to_op("mov", (pcp), val) 469 #define raw_cpu_add_8(pcp, val) percpu_add_op((pcp), val) 470 #define raw_cpu_and_8(pcp, val) percpu_to_op("and", (pcp), val) 471 #define raw_cpu_or_8(pcp, val) percpu_to_op("or", (pcp), val) 472 #define raw_cpu_add_return_8(pcp, val) percpu_add_return_op(pcp, val) 473 #define raw_cpu_xchg_8(pcp, nval) percpu_xchg_op(pcp, nval) 474 #define raw_cpu_cmpxchg_8(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval) 475 476 #define this_cpu_read_8(pcp) percpu_from_op("mov", pcp) 477 #define this_cpu_write_8(pcp, val) percpu_to_op("mov", (pcp), val) 478 #define this_cpu_add_8(pcp, val) percpu_add_op((pcp), val) 479 #define this_cpu_and_8(pcp, val) percpu_to_op("and", (pcp), val) 480 #define this_cpu_or_8(pcp, val) percpu_to_op("or", (pcp), val) 481 #define this_cpu_add_return_8(pcp, val) percpu_add_return_op(pcp, val) 482 #define this_cpu_xchg_8(pcp, nval) percpu_xchg_op(pcp, nval) 483 #define this_cpu_cmpxchg_8(pcp, oval, nval) percpu_cmpxchg_op(pcp, oval, nval) 484 485 /* 486 * Pretty complex macro to generate cmpxchg16 instruction. The instruction 487 * is not supported on early AMD64 processors so we must be able to emulate 488 * it in software. The address used in the cmpxchg16 instruction must be 489 * aligned to a 16 byte boundary. 490 */ 491 #define percpu_cmpxchg16b_double(pcp1, pcp2, o1, o2, n1, n2) \ 492 ({ \ 493 bool __ret; \ 494 typeof(pcp1) __o1 = (o1), __n1 = (n1); \ 495 typeof(pcp2) __o2 = (o2), __n2 = (n2); \ 496 alternative_io("leaq %P1,%%rsi\n\tcall this_cpu_cmpxchg16b_emu\n\t", \ 497 "cmpxchg16b " __percpu_arg(1) "\n\tsetz %0\n\t", \ 498 X86_FEATURE_CX16, \ 499 ASM_OUTPUT2("=a" (__ret), "+m" (pcp1), \ 500 "+m" (pcp2), "+d" (__o2)), \ 501 "b" (__n1), "c" (__n2), "a" (__o1) : "rsi"); \ 502 __ret; \ 503 }) 504 505 #define raw_cpu_cmpxchg_double_8 percpu_cmpxchg16b_double 506 #define this_cpu_cmpxchg_double_8 percpu_cmpxchg16b_double 507 508 #endif 509 510 /* This is not atomic against other CPUs -- CPU preemption needs to be off */ 511 #define x86_test_and_clear_bit_percpu(bit, var) \ 512 ({ \ 513 bool old__; \ 514 asm volatile("btr %2,"__percpu_arg(1)"\n\t" \ 515 CC_SET(c) \ 516 : CC_OUT(c) (old__), "+m" (var) \ 517 : "dIr" (bit)); \ 518 old__; \ 519 }) 520 521 static __always_inline bool x86_this_cpu_constant_test_bit(unsigned int nr, 522 const unsigned long __percpu *addr) 523 { 524 unsigned long __percpu *a = (unsigned long *)addr + nr / BITS_PER_LONG; 525 526 #ifdef CONFIG_X86_64 527 return ((1UL << (nr % BITS_PER_LONG)) & raw_cpu_read_8(*a)) != 0; 528 #else 529 return ((1UL << (nr % BITS_PER_LONG)) & raw_cpu_read_4(*a)) != 0; 530 #endif 531 } 532 533 static inline bool x86_this_cpu_variable_test_bit(int nr, 534 const unsigned long __percpu *addr) 535 { 536 bool oldbit; 537 538 asm volatile("bt "__percpu_arg(2)",%1\n\t" 539 CC_SET(c) 540 : CC_OUT(c) (oldbit) 541 : "m" (*(unsigned long *)addr), "Ir" (nr)); 542 543 return oldbit; 544 } 545 546 #define x86_this_cpu_test_bit(nr, addr) \ 547 (__builtin_constant_p((nr)) \ 548 ? x86_this_cpu_constant_test_bit((nr), (addr)) \ 549 : x86_this_cpu_variable_test_bit((nr), (addr))) 550 551 552 #include <asm-generic/percpu.h> 553 554 /* We can use this directly for local CPU (faster). */ 555 DECLARE_PER_CPU_READ_MOSTLY(unsigned long, this_cpu_off); 556 557 #endif /* !__ASSEMBLY__ */ 558 559 #ifdef CONFIG_SMP 560 561 /* 562 * Define the "EARLY_PER_CPU" macros. These are used for some per_cpu 563 * variables that are initialized and accessed before there are per_cpu 564 * areas allocated. 565 */ 566 567 #define DEFINE_EARLY_PER_CPU(_type, _name, _initvalue) \ 568 DEFINE_PER_CPU(_type, _name) = _initvalue; \ 569 __typeof__(_type) _name##_early_map[NR_CPUS] __initdata = \ 570 { [0 ... NR_CPUS-1] = _initvalue }; \ 571 __typeof__(_type) *_name##_early_ptr __refdata = _name##_early_map 572 573 #define DEFINE_EARLY_PER_CPU_READ_MOSTLY(_type, _name, _initvalue) \ 574 DEFINE_PER_CPU_READ_MOSTLY(_type, _name) = _initvalue; \ 575 __typeof__(_type) _name##_early_map[NR_CPUS] __initdata = \ 576 { [0 ... NR_CPUS-1] = _initvalue }; \ 577 __typeof__(_type) *_name##_early_ptr __refdata = _name##_early_map 578 579 #define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \ 580 EXPORT_PER_CPU_SYMBOL(_name) 581 582 #define DECLARE_EARLY_PER_CPU(_type, _name) \ 583 DECLARE_PER_CPU(_type, _name); \ 584 extern __typeof__(_type) *_name##_early_ptr; \ 585 extern __typeof__(_type) _name##_early_map[] 586 587 #define DECLARE_EARLY_PER_CPU_READ_MOSTLY(_type, _name) \ 588 DECLARE_PER_CPU_READ_MOSTLY(_type, _name); \ 589 extern __typeof__(_type) *_name##_early_ptr; \ 590 extern __typeof__(_type) _name##_early_map[] 591 592 #define early_per_cpu_ptr(_name) (_name##_early_ptr) 593 #define early_per_cpu_map(_name, _idx) (_name##_early_map[_idx]) 594 #define early_per_cpu(_name, _cpu) \ 595 *(early_per_cpu_ptr(_name) ? \ 596 &early_per_cpu_ptr(_name)[_cpu] : \ 597 &per_cpu(_name, _cpu)) 598 599 #else /* !CONFIG_SMP */ 600 #define DEFINE_EARLY_PER_CPU(_type, _name, _initvalue) \ 601 DEFINE_PER_CPU(_type, _name) = _initvalue 602 603 #define DEFINE_EARLY_PER_CPU_READ_MOSTLY(_type, _name, _initvalue) \ 604 DEFINE_PER_CPU_READ_MOSTLY(_type, _name) = _initvalue 605 606 #define EXPORT_EARLY_PER_CPU_SYMBOL(_name) \ 607 EXPORT_PER_CPU_SYMBOL(_name) 608 609 #define DECLARE_EARLY_PER_CPU(_type, _name) \ 610 DECLARE_PER_CPU(_type, _name) 611 612 #define DECLARE_EARLY_PER_CPU_READ_MOSTLY(_type, _name) \ 613 DECLARE_PER_CPU_READ_MOSTLY(_type, _name) 614 615 #define early_per_cpu(_name, _cpu) per_cpu(_name, _cpu) 616 #define early_per_cpu_ptr(_name) NULL 617 /* no early_per_cpu_map() */ 618 619 #endif /* !CONFIG_SMP */ 620 621 #endif /* _ASM_X86_PERCPU_H */ 622