1 #include <linux/bootmem.h> 2 #include <linux/linkage.h> 3 #include <linux/bitops.h> 4 #include <linux/kernel.h> 5 #include <linux/module.h> 6 #include <linux/percpu.h> 7 #include <linux/string.h> 8 #include <linux/delay.h> 9 #include <linux/sched.h> 10 #include <linux/init.h> 11 #include <linux/kgdb.h> 12 #include <linux/smp.h> 13 #include <linux/io.h> 14 15 #include <asm/stackprotector.h> 16 #include <asm/perf_event.h> 17 #include <asm/mmu_context.h> 18 #include <asm/hypervisor.h> 19 #include <asm/processor.h> 20 #include <asm/sections.h> 21 #include <linux/topology.h> 22 #include <linux/cpumask.h> 23 #include <asm/pgtable.h> 24 #include <asm/atomic.h> 25 #include <asm/proto.h> 26 #include <asm/setup.h> 27 #include <asm/apic.h> 28 #include <asm/desc.h> 29 #include <asm/i387.h> 30 #include <asm/mtrr.h> 31 #include <linux/numa.h> 32 #include <asm/asm.h> 33 #include <asm/cpu.h> 34 #include <asm/mce.h> 35 #include <asm/msr.h> 36 #include <asm/pat.h> 37 38 #ifdef CONFIG_X86_LOCAL_APIC 39 #include <asm/uv/uv.h> 40 #endif 41 42 #include "cpu.h" 43 44 /* all of these masks are initialized in setup_cpu_local_masks() */ 45 cpumask_var_t cpu_initialized_mask; 46 cpumask_var_t cpu_callout_mask; 47 cpumask_var_t cpu_callin_mask; 48 49 /* representing cpus for which sibling maps can be computed */ 50 cpumask_var_t cpu_sibling_setup_mask; 51 52 /* correctly size the local cpu masks */ 53 void __init setup_cpu_local_masks(void) 54 { 55 alloc_bootmem_cpumask_var(&cpu_initialized_mask); 56 alloc_bootmem_cpumask_var(&cpu_callin_mask); 57 alloc_bootmem_cpumask_var(&cpu_callout_mask); 58 alloc_bootmem_cpumask_var(&cpu_sibling_setup_mask); 59 } 60 61 static void __cpuinit default_init(struct cpuinfo_x86 *c) 62 { 63 #ifdef CONFIG_X86_64 64 cpu_detect_cache_sizes(c); 65 #else 66 /* Not much we can do here... */ 67 /* Check if at least it has cpuid */ 68 if (c->cpuid_level == -1) { 69 /* No cpuid. It must be an ancient CPU */ 70 if (c->x86 == 4) 71 strcpy(c->x86_model_id, "486"); 72 else if (c->x86 == 3) 73 strcpy(c->x86_model_id, "386"); 74 } 75 #endif 76 } 77 78 static const struct cpu_dev __cpuinitconst default_cpu = { 79 .c_init = default_init, 80 .c_vendor = "Unknown", 81 .c_x86_vendor = X86_VENDOR_UNKNOWN, 82 }; 83 84 static const struct cpu_dev *this_cpu __cpuinitdata = &default_cpu; 85 86 DEFINE_PER_CPU_PAGE_ALIGNED(struct gdt_page, gdt_page) = { .gdt = { 87 #ifdef CONFIG_X86_64 88 /* 89 * We need valid kernel segments for data and code in long mode too 90 * IRET will check the segment types kkeil 2000/10/28 91 * Also sysret mandates a special GDT layout 92 * 93 * TLS descriptors are currently at a different place compared to i386. 94 * Hopefully nobody expects them at a fixed place (Wine?) 95 */ 96 [GDT_ENTRY_KERNEL32_CS] = GDT_ENTRY_INIT(0xc09b, 0, 0xfffff), 97 [GDT_ENTRY_KERNEL_CS] = GDT_ENTRY_INIT(0xa09b, 0, 0xfffff), 98 [GDT_ENTRY_KERNEL_DS] = GDT_ENTRY_INIT(0xc093, 0, 0xfffff), 99 [GDT_ENTRY_DEFAULT_USER32_CS] = GDT_ENTRY_INIT(0xc0fb, 0, 0xfffff), 100 [GDT_ENTRY_DEFAULT_USER_DS] = GDT_ENTRY_INIT(0xc0f3, 0, 0xfffff), 101 [GDT_ENTRY_DEFAULT_USER_CS] = GDT_ENTRY_INIT(0xa0fb, 0, 0xfffff), 102 #else 103 [GDT_ENTRY_KERNEL_CS] = GDT_ENTRY_INIT(0xc09a, 0, 0xfffff), 104 [GDT_ENTRY_KERNEL_DS] = GDT_ENTRY_INIT(0xc092, 0, 0xfffff), 105 [GDT_ENTRY_DEFAULT_USER_CS] = GDT_ENTRY_INIT(0xc0fa, 0, 0xfffff), 106 [GDT_ENTRY_DEFAULT_USER_DS] = GDT_ENTRY_INIT(0xc0f2, 0, 0xfffff), 107 /* 108 * Segments used for calling PnP BIOS have byte granularity. 109 * They code segments and data segments have fixed 64k limits, 110 * the transfer segment sizes are set at run time. 111 */ 112 /* 32-bit code */ 113 [GDT_ENTRY_PNPBIOS_CS32] = GDT_ENTRY_INIT(0x409a, 0, 0xffff), 114 /* 16-bit code */ 115 [GDT_ENTRY_PNPBIOS_CS16] = GDT_ENTRY_INIT(0x009a, 0, 0xffff), 116 /* 16-bit data */ 117 [GDT_ENTRY_PNPBIOS_DS] = GDT_ENTRY_INIT(0x0092, 0, 0xffff), 118 /* 16-bit data */ 119 [GDT_ENTRY_PNPBIOS_TS1] = GDT_ENTRY_INIT(0x0092, 0, 0), 120 /* 16-bit data */ 121 [GDT_ENTRY_PNPBIOS_TS2] = GDT_ENTRY_INIT(0x0092, 0, 0), 122 /* 123 * The APM segments have byte granularity and their bases 124 * are set at run time. All have 64k limits. 125 */ 126 /* 32-bit code */ 127 [GDT_ENTRY_APMBIOS_BASE] = GDT_ENTRY_INIT(0x409a, 0, 0xffff), 128 /* 16-bit code */ 129 [GDT_ENTRY_APMBIOS_BASE+1] = GDT_ENTRY_INIT(0x009a, 0, 0xffff), 130 /* data */ 131 [GDT_ENTRY_APMBIOS_BASE+2] = GDT_ENTRY_INIT(0x4092, 0, 0xffff), 132 133 [GDT_ENTRY_ESPFIX_SS] = GDT_ENTRY_INIT(0xc092, 0, 0xfffff), 134 [GDT_ENTRY_PERCPU] = GDT_ENTRY_INIT(0xc092, 0, 0xfffff), 135 GDT_STACK_CANARY_INIT 136 #endif 137 } }; 138 EXPORT_PER_CPU_SYMBOL_GPL(gdt_page); 139 140 static int __init x86_xsave_setup(char *s) 141 { 142 setup_clear_cpu_cap(X86_FEATURE_XSAVE); 143 setup_clear_cpu_cap(X86_FEATURE_XSAVEOPT); 144 return 1; 145 } 146 __setup("noxsave", x86_xsave_setup); 147 148 static int __init x86_xsaveopt_setup(char *s) 149 { 150 setup_clear_cpu_cap(X86_FEATURE_XSAVEOPT); 151 return 1; 152 } 153 __setup("noxsaveopt", x86_xsaveopt_setup); 154 155 #ifdef CONFIG_X86_32 156 static int cachesize_override __cpuinitdata = -1; 157 static int disable_x86_serial_nr __cpuinitdata = 1; 158 159 static int __init cachesize_setup(char *str) 160 { 161 get_option(&str, &cachesize_override); 162 return 1; 163 } 164 __setup("cachesize=", cachesize_setup); 165 166 static int __init x86_fxsr_setup(char *s) 167 { 168 setup_clear_cpu_cap(X86_FEATURE_FXSR); 169 setup_clear_cpu_cap(X86_FEATURE_XMM); 170 return 1; 171 } 172 __setup("nofxsr", x86_fxsr_setup); 173 174 static int __init x86_sep_setup(char *s) 175 { 176 setup_clear_cpu_cap(X86_FEATURE_SEP); 177 return 1; 178 } 179 __setup("nosep", x86_sep_setup); 180 181 /* Standard macro to see if a specific flag is changeable */ 182 static inline int flag_is_changeable_p(u32 flag) 183 { 184 u32 f1, f2; 185 186 /* 187 * Cyrix and IDT cpus allow disabling of CPUID 188 * so the code below may return different results 189 * when it is executed before and after enabling 190 * the CPUID. Add "volatile" to not allow gcc to 191 * optimize the subsequent calls to this function. 192 */ 193 asm volatile ("pushfl \n\t" 194 "pushfl \n\t" 195 "popl %0 \n\t" 196 "movl %0, %1 \n\t" 197 "xorl %2, %0 \n\t" 198 "pushl %0 \n\t" 199 "popfl \n\t" 200 "pushfl \n\t" 201 "popl %0 \n\t" 202 "popfl \n\t" 203 204 : "=&r" (f1), "=&r" (f2) 205 : "ir" (flag)); 206 207 return ((f1^f2) & flag) != 0; 208 } 209 210 /* Probe for the CPUID instruction */ 211 static int __cpuinit have_cpuid_p(void) 212 { 213 return flag_is_changeable_p(X86_EFLAGS_ID); 214 } 215 216 static void __cpuinit squash_the_stupid_serial_number(struct cpuinfo_x86 *c) 217 { 218 unsigned long lo, hi; 219 220 if (!cpu_has(c, X86_FEATURE_PN) || !disable_x86_serial_nr) 221 return; 222 223 /* Disable processor serial number: */ 224 225 rdmsr(MSR_IA32_BBL_CR_CTL, lo, hi); 226 lo |= 0x200000; 227 wrmsr(MSR_IA32_BBL_CR_CTL, lo, hi); 228 229 printk(KERN_NOTICE "CPU serial number disabled.\n"); 230 clear_cpu_cap(c, X86_FEATURE_PN); 231 232 /* Disabling the serial number may affect the cpuid level */ 233 c->cpuid_level = cpuid_eax(0); 234 } 235 236 static int __init x86_serial_nr_setup(char *s) 237 { 238 disable_x86_serial_nr = 0; 239 return 1; 240 } 241 __setup("serialnumber", x86_serial_nr_setup); 242 #else 243 static inline int flag_is_changeable_p(u32 flag) 244 { 245 return 1; 246 } 247 /* Probe for the CPUID instruction */ 248 static inline int have_cpuid_p(void) 249 { 250 return 1; 251 } 252 static inline void squash_the_stupid_serial_number(struct cpuinfo_x86 *c) 253 { 254 } 255 #endif 256 257 /* 258 * Some CPU features depend on higher CPUID levels, which may not always 259 * be available due to CPUID level capping or broken virtualization 260 * software. Add those features to this table to auto-disable them. 261 */ 262 struct cpuid_dependent_feature { 263 u32 feature; 264 u32 level; 265 }; 266 267 static const struct cpuid_dependent_feature __cpuinitconst 268 cpuid_dependent_features[] = { 269 { X86_FEATURE_MWAIT, 0x00000005 }, 270 { X86_FEATURE_DCA, 0x00000009 }, 271 { X86_FEATURE_XSAVE, 0x0000000d }, 272 { 0, 0 } 273 }; 274 275 static void __cpuinit filter_cpuid_features(struct cpuinfo_x86 *c, bool warn) 276 { 277 const struct cpuid_dependent_feature *df; 278 279 for (df = cpuid_dependent_features; df->feature; df++) { 280 281 if (!cpu_has(c, df->feature)) 282 continue; 283 /* 284 * Note: cpuid_level is set to -1 if unavailable, but 285 * extended_extended_level is set to 0 if unavailable 286 * and the legitimate extended levels are all negative 287 * when signed; hence the weird messing around with 288 * signs here... 289 */ 290 if (!((s32)df->level < 0 ? 291 (u32)df->level > (u32)c->extended_cpuid_level : 292 (s32)df->level > (s32)c->cpuid_level)) 293 continue; 294 295 clear_cpu_cap(c, df->feature); 296 if (!warn) 297 continue; 298 299 printk(KERN_WARNING 300 "CPU: CPU feature %s disabled, no CPUID level 0x%x\n", 301 x86_cap_flags[df->feature], df->level); 302 } 303 } 304 305 /* 306 * Naming convention should be: <Name> [(<Codename>)] 307 * This table only is used unless init_<vendor>() below doesn't set it; 308 * in particular, if CPUID levels 0x80000002..4 are supported, this 309 * isn't used 310 */ 311 312 /* Look up CPU names by table lookup. */ 313 static const char *__cpuinit table_lookup_model(struct cpuinfo_x86 *c) 314 { 315 const struct cpu_model_info *info; 316 317 if (c->x86_model >= 16) 318 return NULL; /* Range check */ 319 320 if (!this_cpu) 321 return NULL; 322 323 info = this_cpu->c_models; 324 325 while (info && info->family) { 326 if (info->family == c->x86) 327 return info->model_names[c->x86_model]; 328 info++; 329 } 330 return NULL; /* Not found */ 331 } 332 333 __u32 cpu_caps_cleared[NCAPINTS] __cpuinitdata; 334 __u32 cpu_caps_set[NCAPINTS] __cpuinitdata; 335 336 void load_percpu_segment(int cpu) 337 { 338 #ifdef CONFIG_X86_32 339 loadsegment(fs, __KERNEL_PERCPU); 340 #else 341 loadsegment(gs, 0); 342 wrmsrl(MSR_GS_BASE, (unsigned long)per_cpu(irq_stack_union.gs_base, cpu)); 343 #endif 344 load_stack_canary_segment(); 345 } 346 347 /* 348 * Current gdt points %fs at the "master" per-cpu area: after this, 349 * it's on the real one. 350 */ 351 void switch_to_new_gdt(int cpu) 352 { 353 struct desc_ptr gdt_descr; 354 355 gdt_descr.address = (long)get_cpu_gdt_table(cpu); 356 gdt_descr.size = GDT_SIZE - 1; 357 load_gdt(&gdt_descr); 358 /* Reload the per-cpu base */ 359 360 load_percpu_segment(cpu); 361 } 362 363 static const struct cpu_dev *__cpuinitdata cpu_devs[X86_VENDOR_NUM] = {}; 364 365 static void __cpuinit get_model_name(struct cpuinfo_x86 *c) 366 { 367 unsigned int *v; 368 char *p, *q; 369 370 if (c->extended_cpuid_level < 0x80000004) 371 return; 372 373 v = (unsigned int *)c->x86_model_id; 374 cpuid(0x80000002, &v[0], &v[1], &v[2], &v[3]); 375 cpuid(0x80000003, &v[4], &v[5], &v[6], &v[7]); 376 cpuid(0x80000004, &v[8], &v[9], &v[10], &v[11]); 377 c->x86_model_id[48] = 0; 378 379 /* 380 * Intel chips right-justify this string for some dumb reason; 381 * undo that brain damage: 382 */ 383 p = q = &c->x86_model_id[0]; 384 while (*p == ' ') 385 p++; 386 if (p != q) { 387 while (*p) 388 *q++ = *p++; 389 while (q <= &c->x86_model_id[48]) 390 *q++ = '\0'; /* Zero-pad the rest */ 391 } 392 } 393 394 void __cpuinit cpu_detect_cache_sizes(struct cpuinfo_x86 *c) 395 { 396 unsigned int n, dummy, ebx, ecx, edx, l2size; 397 398 n = c->extended_cpuid_level; 399 400 if (n >= 0x80000005) { 401 cpuid(0x80000005, &dummy, &ebx, &ecx, &edx); 402 c->x86_cache_size = (ecx>>24) + (edx>>24); 403 #ifdef CONFIG_X86_64 404 /* On K8 L1 TLB is inclusive, so don't count it */ 405 c->x86_tlbsize = 0; 406 #endif 407 } 408 409 if (n < 0x80000006) /* Some chips just has a large L1. */ 410 return; 411 412 cpuid(0x80000006, &dummy, &ebx, &ecx, &edx); 413 l2size = ecx >> 16; 414 415 #ifdef CONFIG_X86_64 416 c->x86_tlbsize += ((ebx >> 16) & 0xfff) + (ebx & 0xfff); 417 #else 418 /* do processor-specific cache resizing */ 419 if (this_cpu->c_size_cache) 420 l2size = this_cpu->c_size_cache(c, l2size); 421 422 /* Allow user to override all this if necessary. */ 423 if (cachesize_override != -1) 424 l2size = cachesize_override; 425 426 if (l2size == 0) 427 return; /* Again, no L2 cache is possible */ 428 #endif 429 430 c->x86_cache_size = l2size; 431 } 432 433 void __cpuinit detect_ht(struct cpuinfo_x86 *c) 434 { 435 #ifdef CONFIG_X86_HT 436 u32 eax, ebx, ecx, edx; 437 int index_msb, core_bits; 438 static bool printed; 439 440 if (!cpu_has(c, X86_FEATURE_HT)) 441 return; 442 443 if (cpu_has(c, X86_FEATURE_CMP_LEGACY)) 444 goto out; 445 446 if (cpu_has(c, X86_FEATURE_XTOPOLOGY)) 447 return; 448 449 cpuid(1, &eax, &ebx, &ecx, &edx); 450 451 smp_num_siblings = (ebx & 0xff0000) >> 16; 452 453 if (smp_num_siblings == 1) { 454 printk_once(KERN_INFO "CPU0: Hyper-Threading is disabled\n"); 455 goto out; 456 } 457 458 if (smp_num_siblings <= 1) 459 goto out; 460 461 if (smp_num_siblings > nr_cpu_ids) { 462 pr_warning("CPU: Unsupported number of siblings %d", 463 smp_num_siblings); 464 smp_num_siblings = 1; 465 return; 466 } 467 468 index_msb = get_count_order(smp_num_siblings); 469 c->phys_proc_id = apic->phys_pkg_id(c->initial_apicid, index_msb); 470 471 smp_num_siblings = smp_num_siblings / c->x86_max_cores; 472 473 index_msb = get_count_order(smp_num_siblings); 474 475 core_bits = get_count_order(c->x86_max_cores); 476 477 c->cpu_core_id = apic->phys_pkg_id(c->initial_apicid, index_msb) & 478 ((1 << core_bits) - 1); 479 480 out: 481 if (!printed && (c->x86_max_cores * smp_num_siblings) > 1) { 482 printk(KERN_INFO "CPU: Physical Processor ID: %d\n", 483 c->phys_proc_id); 484 printk(KERN_INFO "CPU: Processor Core ID: %d\n", 485 c->cpu_core_id); 486 printed = 1; 487 } 488 #endif 489 } 490 491 static void __cpuinit get_cpu_vendor(struct cpuinfo_x86 *c) 492 { 493 char *v = c->x86_vendor_id; 494 int i; 495 496 for (i = 0; i < X86_VENDOR_NUM; i++) { 497 if (!cpu_devs[i]) 498 break; 499 500 if (!strcmp(v, cpu_devs[i]->c_ident[0]) || 501 (cpu_devs[i]->c_ident[1] && 502 !strcmp(v, cpu_devs[i]->c_ident[1]))) { 503 504 this_cpu = cpu_devs[i]; 505 c->x86_vendor = this_cpu->c_x86_vendor; 506 return; 507 } 508 } 509 510 printk_once(KERN_ERR 511 "CPU: vendor_id '%s' unknown, using generic init.\n" \ 512 "CPU: Your system may be unstable.\n", v); 513 514 c->x86_vendor = X86_VENDOR_UNKNOWN; 515 this_cpu = &default_cpu; 516 } 517 518 void __cpuinit cpu_detect(struct cpuinfo_x86 *c) 519 { 520 /* Get vendor name */ 521 cpuid(0x00000000, (unsigned int *)&c->cpuid_level, 522 (unsigned int *)&c->x86_vendor_id[0], 523 (unsigned int *)&c->x86_vendor_id[8], 524 (unsigned int *)&c->x86_vendor_id[4]); 525 526 c->x86 = 4; 527 /* Intel-defined flags: level 0x00000001 */ 528 if (c->cpuid_level >= 0x00000001) { 529 u32 junk, tfms, cap0, misc; 530 531 cpuid(0x00000001, &tfms, &misc, &junk, &cap0); 532 c->x86 = (tfms >> 8) & 0xf; 533 c->x86_model = (tfms >> 4) & 0xf; 534 c->x86_mask = tfms & 0xf; 535 536 if (c->x86 == 0xf) 537 c->x86 += (tfms >> 20) & 0xff; 538 if (c->x86 >= 0x6) 539 c->x86_model += ((tfms >> 16) & 0xf) << 4; 540 541 if (cap0 & (1<<19)) { 542 c->x86_clflush_size = ((misc >> 8) & 0xff) * 8; 543 c->x86_cache_alignment = c->x86_clflush_size; 544 } 545 } 546 } 547 548 void __cpuinit get_cpu_cap(struct cpuinfo_x86 *c) 549 { 550 u32 tfms, xlvl; 551 u32 ebx; 552 553 /* Intel-defined flags: level 0x00000001 */ 554 if (c->cpuid_level >= 0x00000001) { 555 u32 capability, excap; 556 557 cpuid(0x00000001, &tfms, &ebx, &excap, &capability); 558 c->x86_capability[0] = capability; 559 c->x86_capability[4] = excap; 560 } 561 562 /* Additional Intel-defined flags: level 0x00000007 */ 563 if (c->cpuid_level >= 0x00000007) { 564 u32 eax, ebx, ecx, edx; 565 566 cpuid_count(0x00000007, 0, &eax, &ebx, &ecx, &edx); 567 568 if (eax > 0) 569 c->x86_capability[9] = ebx; 570 } 571 572 /* AMD-defined flags: level 0x80000001 */ 573 xlvl = cpuid_eax(0x80000000); 574 c->extended_cpuid_level = xlvl; 575 576 if ((xlvl & 0xffff0000) == 0x80000000) { 577 if (xlvl >= 0x80000001) { 578 c->x86_capability[1] = cpuid_edx(0x80000001); 579 c->x86_capability[6] = cpuid_ecx(0x80000001); 580 } 581 } 582 583 if (c->extended_cpuid_level >= 0x80000008) { 584 u32 eax = cpuid_eax(0x80000008); 585 586 c->x86_virt_bits = (eax >> 8) & 0xff; 587 c->x86_phys_bits = eax & 0xff; 588 } 589 #ifdef CONFIG_X86_32 590 else if (cpu_has(c, X86_FEATURE_PAE) || cpu_has(c, X86_FEATURE_PSE36)) 591 c->x86_phys_bits = 36; 592 #endif 593 594 if (c->extended_cpuid_level >= 0x80000007) 595 c->x86_power = cpuid_edx(0x80000007); 596 597 init_scattered_cpuid_features(c); 598 } 599 600 static void __cpuinit identify_cpu_without_cpuid(struct cpuinfo_x86 *c) 601 { 602 #ifdef CONFIG_X86_32 603 int i; 604 605 /* 606 * First of all, decide if this is a 486 or higher 607 * It's a 486 if we can modify the AC flag 608 */ 609 if (flag_is_changeable_p(X86_EFLAGS_AC)) 610 c->x86 = 4; 611 else 612 c->x86 = 3; 613 614 for (i = 0; i < X86_VENDOR_NUM; i++) 615 if (cpu_devs[i] && cpu_devs[i]->c_identify) { 616 c->x86_vendor_id[0] = 0; 617 cpu_devs[i]->c_identify(c); 618 if (c->x86_vendor_id[0]) { 619 get_cpu_vendor(c); 620 break; 621 } 622 } 623 #endif 624 } 625 626 /* 627 * Do minimum CPU detection early. 628 * Fields really needed: vendor, cpuid_level, family, model, mask, 629 * cache alignment. 630 * The others are not touched to avoid unwanted side effects. 631 * 632 * WARNING: this function is only called on the BP. Don't add code here 633 * that is supposed to run on all CPUs. 634 */ 635 static void __init early_identify_cpu(struct cpuinfo_x86 *c) 636 { 637 #ifdef CONFIG_X86_64 638 c->x86_clflush_size = 64; 639 c->x86_phys_bits = 36; 640 c->x86_virt_bits = 48; 641 #else 642 c->x86_clflush_size = 32; 643 c->x86_phys_bits = 32; 644 c->x86_virt_bits = 32; 645 #endif 646 c->x86_cache_alignment = c->x86_clflush_size; 647 648 memset(&c->x86_capability, 0, sizeof c->x86_capability); 649 c->extended_cpuid_level = 0; 650 651 if (!have_cpuid_p()) 652 identify_cpu_without_cpuid(c); 653 654 /* cyrix could have cpuid enabled via c_identify()*/ 655 if (!have_cpuid_p()) 656 return; 657 658 cpu_detect(c); 659 660 get_cpu_vendor(c); 661 662 get_cpu_cap(c); 663 664 if (this_cpu->c_early_init) 665 this_cpu->c_early_init(c); 666 667 #ifdef CONFIG_SMP 668 c->cpu_index = 0; 669 #endif 670 filter_cpuid_features(c, false); 671 } 672 673 void __init early_cpu_init(void) 674 { 675 const struct cpu_dev *const *cdev; 676 int count = 0; 677 678 #ifdef PROCESSOR_SELECT 679 printk(KERN_INFO "KERNEL supported cpus:\n"); 680 #endif 681 682 for (cdev = __x86_cpu_dev_start; cdev < __x86_cpu_dev_end; cdev++) { 683 const struct cpu_dev *cpudev = *cdev; 684 685 if (count >= X86_VENDOR_NUM) 686 break; 687 cpu_devs[count] = cpudev; 688 count++; 689 690 #ifdef PROCESSOR_SELECT 691 { 692 unsigned int j; 693 694 for (j = 0; j < 2; j++) { 695 if (!cpudev->c_ident[j]) 696 continue; 697 printk(KERN_INFO " %s %s\n", cpudev->c_vendor, 698 cpudev->c_ident[j]); 699 } 700 } 701 #endif 702 } 703 early_identify_cpu(&boot_cpu_data); 704 } 705 706 /* 707 * The NOPL instruction is supposed to exist on all CPUs of family >= 6; 708 * unfortunately, that's not true in practice because of early VIA 709 * chips and (more importantly) broken virtualizers that are not easy 710 * to detect. In the latter case it doesn't even *fail* reliably, so 711 * probing for it doesn't even work. Disable it completely on 32-bit 712 * unless we can find a reliable way to detect all the broken cases. 713 * Enable it explicitly on 64-bit for non-constant inputs of cpu_has(). 714 */ 715 static void __cpuinit detect_nopl(struct cpuinfo_x86 *c) 716 { 717 #ifdef CONFIG_X86_32 718 clear_cpu_cap(c, X86_FEATURE_NOPL); 719 #else 720 set_cpu_cap(c, X86_FEATURE_NOPL); 721 #endif 722 } 723 724 static void __cpuinit generic_identify(struct cpuinfo_x86 *c) 725 { 726 c->extended_cpuid_level = 0; 727 728 if (!have_cpuid_p()) 729 identify_cpu_without_cpuid(c); 730 731 /* cyrix could have cpuid enabled via c_identify()*/ 732 if (!have_cpuid_p()) 733 return; 734 735 cpu_detect(c); 736 737 get_cpu_vendor(c); 738 739 get_cpu_cap(c); 740 741 if (c->cpuid_level >= 0x00000001) { 742 c->initial_apicid = (cpuid_ebx(1) >> 24) & 0xFF; 743 #ifdef CONFIG_X86_32 744 # ifdef CONFIG_X86_HT 745 c->apicid = apic->phys_pkg_id(c->initial_apicid, 0); 746 # else 747 c->apicid = c->initial_apicid; 748 # endif 749 #endif 750 751 #ifdef CONFIG_X86_HT 752 c->phys_proc_id = c->initial_apicid; 753 #endif 754 } 755 756 get_model_name(c); /* Default name */ 757 758 detect_nopl(c); 759 } 760 761 /* 762 * This does the hard work of actually picking apart the CPU stuff... 763 */ 764 static void __cpuinit identify_cpu(struct cpuinfo_x86 *c) 765 { 766 int i; 767 768 c->loops_per_jiffy = loops_per_jiffy; 769 c->x86_cache_size = -1; 770 c->x86_vendor = X86_VENDOR_UNKNOWN; 771 c->x86_model = c->x86_mask = 0; /* So far unknown... */ 772 c->x86_vendor_id[0] = '\0'; /* Unset */ 773 c->x86_model_id[0] = '\0'; /* Unset */ 774 c->x86_max_cores = 1; 775 c->x86_coreid_bits = 0; 776 #ifdef CONFIG_X86_64 777 c->x86_clflush_size = 64; 778 c->x86_phys_bits = 36; 779 c->x86_virt_bits = 48; 780 #else 781 c->cpuid_level = -1; /* CPUID not detected */ 782 c->x86_clflush_size = 32; 783 c->x86_phys_bits = 32; 784 c->x86_virt_bits = 32; 785 #endif 786 c->x86_cache_alignment = c->x86_clflush_size; 787 memset(&c->x86_capability, 0, sizeof c->x86_capability); 788 789 generic_identify(c); 790 791 if (this_cpu->c_identify) 792 this_cpu->c_identify(c); 793 794 /* Clear/Set all flags overriden by options, after probe */ 795 for (i = 0; i < NCAPINTS; i++) { 796 c->x86_capability[i] &= ~cpu_caps_cleared[i]; 797 c->x86_capability[i] |= cpu_caps_set[i]; 798 } 799 800 #ifdef CONFIG_X86_64 801 c->apicid = apic->phys_pkg_id(c->initial_apicid, 0); 802 #endif 803 804 /* 805 * Vendor-specific initialization. In this section we 806 * canonicalize the feature flags, meaning if there are 807 * features a certain CPU supports which CPUID doesn't 808 * tell us, CPUID claiming incorrect flags, or other bugs, 809 * we handle them here. 810 * 811 * At the end of this section, c->x86_capability better 812 * indicate the features this CPU genuinely supports! 813 */ 814 if (this_cpu->c_init) 815 this_cpu->c_init(c); 816 817 /* Disable the PN if appropriate */ 818 squash_the_stupid_serial_number(c); 819 820 /* 821 * The vendor-specific functions might have changed features. 822 * Now we do "generic changes." 823 */ 824 825 /* Filter out anything that depends on CPUID levels we don't have */ 826 filter_cpuid_features(c, true); 827 828 /* If the model name is still unset, do table lookup. */ 829 if (!c->x86_model_id[0]) { 830 const char *p; 831 p = table_lookup_model(c); 832 if (p) 833 strcpy(c->x86_model_id, p); 834 else 835 /* Last resort... */ 836 sprintf(c->x86_model_id, "%02x/%02x", 837 c->x86, c->x86_model); 838 } 839 840 #ifdef CONFIG_X86_64 841 detect_ht(c); 842 #endif 843 844 init_hypervisor(c); 845 846 /* 847 * Clear/Set all flags overriden by options, need do it 848 * before following smp all cpus cap AND. 849 */ 850 for (i = 0; i < NCAPINTS; i++) { 851 c->x86_capability[i] &= ~cpu_caps_cleared[i]; 852 c->x86_capability[i] |= cpu_caps_set[i]; 853 } 854 855 /* 856 * On SMP, boot_cpu_data holds the common feature set between 857 * all CPUs; so make sure that we indicate which features are 858 * common between the CPUs. The first time this routine gets 859 * executed, c == &boot_cpu_data. 860 */ 861 if (c != &boot_cpu_data) { 862 /* AND the already accumulated flags with these */ 863 for (i = 0; i < NCAPINTS; i++) 864 boot_cpu_data.x86_capability[i] &= c->x86_capability[i]; 865 } 866 867 /* Init Machine Check Exception if available. */ 868 mcheck_cpu_init(c); 869 870 select_idle_routine(c); 871 872 #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64) 873 numa_add_cpu(smp_processor_id()); 874 #endif 875 } 876 877 #ifdef CONFIG_X86_64 878 static void vgetcpu_set_mode(void) 879 { 880 if (cpu_has(&boot_cpu_data, X86_FEATURE_RDTSCP)) 881 vgetcpu_mode = VGETCPU_RDTSCP; 882 else 883 vgetcpu_mode = VGETCPU_LSL; 884 } 885 #endif 886 887 void __init identify_boot_cpu(void) 888 { 889 identify_cpu(&boot_cpu_data); 890 init_c1e_mask(); 891 #ifdef CONFIG_X86_32 892 sysenter_setup(); 893 enable_sep_cpu(); 894 #else 895 vgetcpu_set_mode(); 896 #endif 897 } 898 899 void __cpuinit identify_secondary_cpu(struct cpuinfo_x86 *c) 900 { 901 BUG_ON(c == &boot_cpu_data); 902 identify_cpu(c); 903 #ifdef CONFIG_X86_32 904 enable_sep_cpu(); 905 #endif 906 mtrr_ap_init(); 907 } 908 909 struct msr_range { 910 unsigned min; 911 unsigned max; 912 }; 913 914 static const struct msr_range msr_range_array[] __cpuinitconst = { 915 { 0x00000000, 0x00000418}, 916 { 0xc0000000, 0xc000040b}, 917 { 0xc0010000, 0xc0010142}, 918 { 0xc0011000, 0xc001103b}, 919 }; 920 921 static void __cpuinit print_cpu_msr(void) 922 { 923 unsigned index_min, index_max; 924 unsigned index; 925 u64 val; 926 int i; 927 928 for (i = 0; i < ARRAY_SIZE(msr_range_array); i++) { 929 index_min = msr_range_array[i].min; 930 index_max = msr_range_array[i].max; 931 932 for (index = index_min; index < index_max; index++) { 933 if (rdmsrl_amd_safe(index, &val)) 934 continue; 935 printk(KERN_INFO " MSR%08x: %016llx\n", index, val); 936 } 937 } 938 } 939 940 static int show_msr __cpuinitdata; 941 942 static __init int setup_show_msr(char *arg) 943 { 944 int num; 945 946 get_option(&arg, &num); 947 948 if (num > 0) 949 show_msr = num; 950 return 1; 951 } 952 __setup("show_msr=", setup_show_msr); 953 954 static __init int setup_noclflush(char *arg) 955 { 956 setup_clear_cpu_cap(X86_FEATURE_CLFLSH); 957 return 1; 958 } 959 __setup("noclflush", setup_noclflush); 960 961 void __cpuinit print_cpu_info(struct cpuinfo_x86 *c) 962 { 963 const char *vendor = NULL; 964 965 if (c->x86_vendor < X86_VENDOR_NUM) { 966 vendor = this_cpu->c_vendor; 967 } else { 968 if (c->cpuid_level >= 0) 969 vendor = c->x86_vendor_id; 970 } 971 972 if (vendor && !strstr(c->x86_model_id, vendor)) 973 printk(KERN_CONT "%s ", vendor); 974 975 if (c->x86_model_id[0]) 976 printk(KERN_CONT "%s", c->x86_model_id); 977 else 978 printk(KERN_CONT "%d86", c->x86); 979 980 if (c->x86_mask || c->cpuid_level >= 0) 981 printk(KERN_CONT " stepping %02x\n", c->x86_mask); 982 else 983 printk(KERN_CONT "\n"); 984 985 #ifdef CONFIG_SMP 986 if (c->cpu_index < show_msr) 987 print_cpu_msr(); 988 #else 989 if (show_msr) 990 print_cpu_msr(); 991 #endif 992 } 993 994 static __init int setup_disablecpuid(char *arg) 995 { 996 int bit; 997 998 if (get_option(&arg, &bit) && bit < NCAPINTS*32) 999 setup_clear_cpu_cap(bit); 1000 else 1001 return 0; 1002 1003 return 1; 1004 } 1005 __setup("clearcpuid=", setup_disablecpuid); 1006 1007 #ifdef CONFIG_X86_64 1008 struct desc_ptr idt_descr = { NR_VECTORS * 16 - 1, (unsigned long) idt_table }; 1009 1010 DEFINE_PER_CPU_FIRST(union irq_stack_union, 1011 irq_stack_union) __aligned(PAGE_SIZE); 1012 1013 /* 1014 * The following four percpu variables are hot. Align current_task to 1015 * cacheline size such that all four fall in the same cacheline. 1016 */ 1017 DEFINE_PER_CPU(struct task_struct *, current_task) ____cacheline_aligned = 1018 &init_task; 1019 EXPORT_PER_CPU_SYMBOL(current_task); 1020 1021 DEFINE_PER_CPU(unsigned long, kernel_stack) = 1022 (unsigned long)&init_thread_union - KERNEL_STACK_OFFSET + THREAD_SIZE; 1023 EXPORT_PER_CPU_SYMBOL(kernel_stack); 1024 1025 DEFINE_PER_CPU(char *, irq_stack_ptr) = 1026 init_per_cpu_var(irq_stack_union.irq_stack) + IRQ_STACK_SIZE - 64; 1027 1028 DEFINE_PER_CPU(unsigned int, irq_count) = -1; 1029 1030 /* 1031 * Special IST stacks which the CPU switches to when it calls 1032 * an IST-marked descriptor entry. Up to 7 stacks (hardware 1033 * limit), all of them are 4K, except the debug stack which 1034 * is 8K. 1035 */ 1036 static const unsigned int exception_stack_sizes[N_EXCEPTION_STACKS] = { 1037 [0 ... N_EXCEPTION_STACKS - 1] = EXCEPTION_STKSZ, 1038 [DEBUG_STACK - 1] = DEBUG_STKSZ 1039 }; 1040 1041 static DEFINE_PER_CPU_PAGE_ALIGNED(char, exception_stacks 1042 [(N_EXCEPTION_STACKS - 1) * EXCEPTION_STKSZ + DEBUG_STKSZ]); 1043 1044 /* May not be marked __init: used by software suspend */ 1045 void syscall_init(void) 1046 { 1047 /* 1048 * LSTAR and STAR live in a bit strange symbiosis. 1049 * They both write to the same internal register. STAR allows to 1050 * set CS/DS but only a 32bit target. LSTAR sets the 64bit rip. 1051 */ 1052 wrmsrl(MSR_STAR, ((u64)__USER32_CS)<<48 | ((u64)__KERNEL_CS)<<32); 1053 wrmsrl(MSR_LSTAR, system_call); 1054 wrmsrl(MSR_CSTAR, ignore_sysret); 1055 1056 #ifdef CONFIG_IA32_EMULATION 1057 syscall32_cpu_init(); 1058 #endif 1059 1060 /* Flags to clear on syscall */ 1061 wrmsrl(MSR_SYSCALL_MASK, 1062 X86_EFLAGS_TF|X86_EFLAGS_DF|X86_EFLAGS_IF|X86_EFLAGS_IOPL); 1063 } 1064 1065 unsigned long kernel_eflags; 1066 1067 /* 1068 * Copies of the original ist values from the tss are only accessed during 1069 * debugging, no special alignment required. 1070 */ 1071 DEFINE_PER_CPU(struct orig_ist, orig_ist); 1072 1073 #else /* CONFIG_X86_64 */ 1074 1075 DEFINE_PER_CPU(struct task_struct *, current_task) = &init_task; 1076 EXPORT_PER_CPU_SYMBOL(current_task); 1077 1078 #ifdef CONFIG_CC_STACKPROTECTOR 1079 DEFINE_PER_CPU_ALIGNED(struct stack_canary, stack_canary); 1080 #endif 1081 1082 /* Make sure %fs and %gs are initialized properly in idle threads */ 1083 struct pt_regs * __cpuinit idle_regs(struct pt_regs *regs) 1084 { 1085 memset(regs, 0, sizeof(struct pt_regs)); 1086 regs->fs = __KERNEL_PERCPU; 1087 regs->gs = __KERNEL_STACK_CANARY; 1088 1089 return regs; 1090 } 1091 #endif /* CONFIG_X86_64 */ 1092 1093 /* 1094 * Clear all 6 debug registers: 1095 */ 1096 static void clear_all_debug_regs(void) 1097 { 1098 int i; 1099 1100 for (i = 0; i < 8; i++) { 1101 /* Ignore db4, db5 */ 1102 if ((i == 4) || (i == 5)) 1103 continue; 1104 1105 set_debugreg(0, i); 1106 } 1107 } 1108 1109 #ifdef CONFIG_KGDB 1110 /* 1111 * Restore debug regs if using kgdbwait and you have a kernel debugger 1112 * connection established. 1113 */ 1114 static void dbg_restore_debug_regs(void) 1115 { 1116 if (unlikely(kgdb_connected && arch_kgdb_ops.correct_hw_break)) 1117 arch_kgdb_ops.correct_hw_break(); 1118 } 1119 #else /* ! CONFIG_KGDB */ 1120 #define dbg_restore_debug_regs() 1121 #endif /* ! CONFIG_KGDB */ 1122 1123 /* 1124 * cpu_init() initializes state that is per-CPU. Some data is already 1125 * initialized (naturally) in the bootstrap process, such as the GDT 1126 * and IDT. We reload them nevertheless, this function acts as a 1127 * 'CPU state barrier', nothing should get across. 1128 * A lot of state is already set up in PDA init for 64 bit 1129 */ 1130 #ifdef CONFIG_X86_64 1131 1132 void __cpuinit cpu_init(void) 1133 { 1134 struct orig_ist *oist; 1135 struct task_struct *me; 1136 struct tss_struct *t; 1137 unsigned long v; 1138 int cpu; 1139 int i; 1140 1141 cpu = stack_smp_processor_id(); 1142 t = &per_cpu(init_tss, cpu); 1143 oist = &per_cpu(orig_ist, cpu); 1144 1145 #ifdef CONFIG_NUMA 1146 if (cpu != 0 && percpu_read(numa_node) == 0 && 1147 early_cpu_to_node(cpu) != NUMA_NO_NODE) 1148 set_numa_node(early_cpu_to_node(cpu)); 1149 #endif 1150 1151 me = current; 1152 1153 if (cpumask_test_and_set_cpu(cpu, cpu_initialized_mask)) 1154 panic("CPU#%d already initialized!\n", cpu); 1155 1156 pr_debug("Initializing CPU#%d\n", cpu); 1157 1158 clear_in_cr4(X86_CR4_VME|X86_CR4_PVI|X86_CR4_TSD|X86_CR4_DE); 1159 1160 /* 1161 * Initialize the per-CPU GDT with the boot GDT, 1162 * and set up the GDT descriptor: 1163 */ 1164 1165 switch_to_new_gdt(cpu); 1166 loadsegment(fs, 0); 1167 1168 load_idt((const struct desc_ptr *)&idt_descr); 1169 1170 memset(me->thread.tls_array, 0, GDT_ENTRY_TLS_ENTRIES * 8); 1171 syscall_init(); 1172 1173 wrmsrl(MSR_FS_BASE, 0); 1174 wrmsrl(MSR_KERNEL_GS_BASE, 0); 1175 barrier(); 1176 1177 x86_configure_nx(); 1178 if (cpu != 0) 1179 enable_x2apic(); 1180 1181 /* 1182 * set up and load the per-CPU TSS 1183 */ 1184 if (!oist->ist[0]) { 1185 char *estacks = per_cpu(exception_stacks, cpu); 1186 1187 for (v = 0; v < N_EXCEPTION_STACKS; v++) { 1188 estacks += exception_stack_sizes[v]; 1189 oist->ist[v] = t->x86_tss.ist[v] = 1190 (unsigned long)estacks; 1191 } 1192 } 1193 1194 t->x86_tss.io_bitmap_base = offsetof(struct tss_struct, io_bitmap); 1195 1196 /* 1197 * <= is required because the CPU will access up to 1198 * 8 bits beyond the end of the IO permission bitmap. 1199 */ 1200 for (i = 0; i <= IO_BITMAP_LONGS; i++) 1201 t->io_bitmap[i] = ~0UL; 1202 1203 atomic_inc(&init_mm.mm_count); 1204 me->active_mm = &init_mm; 1205 BUG_ON(me->mm); 1206 enter_lazy_tlb(&init_mm, me); 1207 1208 load_sp0(t, ¤t->thread); 1209 set_tss_desc(cpu, t); 1210 load_TR_desc(); 1211 load_LDT(&init_mm.context); 1212 1213 clear_all_debug_regs(); 1214 dbg_restore_debug_regs(); 1215 1216 fpu_init(); 1217 xsave_init(); 1218 1219 raw_local_save_flags(kernel_eflags); 1220 1221 if (is_uv_system()) 1222 uv_cpu_init(); 1223 } 1224 1225 #else 1226 1227 void __cpuinit cpu_init(void) 1228 { 1229 int cpu = smp_processor_id(); 1230 struct task_struct *curr = current; 1231 struct tss_struct *t = &per_cpu(init_tss, cpu); 1232 struct thread_struct *thread = &curr->thread; 1233 1234 if (cpumask_test_and_set_cpu(cpu, cpu_initialized_mask)) { 1235 printk(KERN_WARNING "CPU#%d already initialized!\n", cpu); 1236 for (;;) 1237 local_irq_enable(); 1238 } 1239 1240 printk(KERN_INFO "Initializing CPU#%d\n", cpu); 1241 1242 if (cpu_has_vme || cpu_has_tsc || cpu_has_de) 1243 clear_in_cr4(X86_CR4_VME|X86_CR4_PVI|X86_CR4_TSD|X86_CR4_DE); 1244 1245 load_idt(&idt_descr); 1246 switch_to_new_gdt(cpu); 1247 1248 /* 1249 * Set up and load the per-CPU TSS and LDT 1250 */ 1251 atomic_inc(&init_mm.mm_count); 1252 curr->active_mm = &init_mm; 1253 BUG_ON(curr->mm); 1254 enter_lazy_tlb(&init_mm, curr); 1255 1256 load_sp0(t, thread); 1257 set_tss_desc(cpu, t); 1258 load_TR_desc(); 1259 load_LDT(&init_mm.context); 1260 1261 t->x86_tss.io_bitmap_base = offsetof(struct tss_struct, io_bitmap); 1262 1263 #ifdef CONFIG_DOUBLEFAULT 1264 /* Set up doublefault TSS pointer in the GDT */ 1265 __set_tss_desc(cpu, GDT_ENTRY_DOUBLEFAULT_TSS, &doublefault_tss); 1266 #endif 1267 1268 clear_all_debug_regs(); 1269 dbg_restore_debug_regs(); 1270 1271 fpu_init(); 1272 xsave_init(); 1273 } 1274 #endif 1275