1/* 2 * Intel CPU microcode early update for Linux 3 * 4 * Copyright (C) 2012 Fenghua Yu <fenghua.yu@intel.com> 5 * H Peter Anvin" <hpa@zytor.com> 6 * 7 * This allows to early upgrade microcode on Intel processors 8 * belonging to IA-32 family - PentiumPro, Pentium II, 9 * Pentium III, Xeon, Pentium 4, etc. 10 * 11 * Reference: Section 9.11 of Volume 3, IA-32 Intel Architecture 12 * Software Developer's Manual. 13 * 14 * This program is free software; you can redistribute it and/or 15 * modify it under the terms of the GNU General Public License 16 * as published by the Free Software Foundation; either version 17 * 2 of the License, or (at your option) any later version. 18 */ 19 20/* 21 * This needs to be before all headers so that pr_debug in printk.h doesn't turn 22 * printk calls into no_printk(). 23 * 24 *#define DEBUG 25 */ 26 27#include <linux/module.h> 28#include <linux/mm.h> 29#include <linux/slab.h> 30#include <linux/earlycpio.h> 31#include <linux/initrd.h> 32#include <linux/cpu.h> 33#include <asm/msr.h> 34#include <asm/microcode_intel.h> 35#include <asm/processor.h> 36#include <asm/tlbflush.h> 37#include <asm/setup.h> 38 39#undef pr_fmt 40#define pr_fmt(fmt) "microcode: " fmt 41 42static unsigned long mc_saved_in_initrd[MAX_UCODE_COUNT]; 43static struct mc_saved_data { 44 unsigned int mc_saved_count; 45 struct microcode_intel **mc_saved; 46} mc_saved_data; 47 48static enum ucode_state 49load_microcode_early(struct microcode_intel **saved, 50 unsigned int num_saved, struct ucode_cpu_info *uci) 51{ 52 struct microcode_intel *ucode_ptr, *new_mc = NULL; 53 struct microcode_header_intel *mc_hdr; 54 int new_rev, ret, i; 55 56 new_rev = uci->cpu_sig.rev; 57 58 for (i = 0; i < num_saved; i++) { 59 ucode_ptr = saved[i]; 60 mc_hdr = (struct microcode_header_intel *)ucode_ptr; 61 62 ret = get_matching_microcode(uci->cpu_sig.sig, 63 uci->cpu_sig.pf, 64 new_rev, 65 ucode_ptr); 66 if (!ret) 67 continue; 68 69 new_rev = mc_hdr->rev; 70 new_mc = ucode_ptr; 71 } 72 73 if (!new_mc) 74 return UCODE_NFOUND; 75 76 uci->mc = (struct microcode_intel *)new_mc; 77 return UCODE_OK; 78} 79 80static inline void 81copy_initrd_ptrs(struct microcode_intel **mc_saved, unsigned long *initrd, 82 unsigned long off, int num_saved) 83{ 84 int i; 85 86 for (i = 0; i < num_saved; i++) 87 mc_saved[i] = (struct microcode_intel *)(initrd[i] + off); 88} 89 90#ifdef CONFIG_X86_32 91static void 92microcode_phys(struct microcode_intel **mc_saved_tmp, 93 struct mc_saved_data *mc_saved_data) 94{ 95 int i; 96 struct microcode_intel ***mc_saved; 97 98 mc_saved = (struct microcode_intel ***) 99 __pa_nodebug(&mc_saved_data->mc_saved); 100 for (i = 0; i < mc_saved_data->mc_saved_count; i++) { 101 struct microcode_intel *p; 102 103 p = *(struct microcode_intel **) 104 __pa_nodebug(mc_saved_data->mc_saved + i); 105 mc_saved_tmp[i] = (struct microcode_intel *)__pa_nodebug(p); 106 } 107} 108#endif 109 110static enum ucode_state 111load_microcode(struct mc_saved_data *mc_saved_data, unsigned long *initrd, 112 unsigned long initrd_start, struct ucode_cpu_info *uci) 113{ 114 struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT]; 115 unsigned int count = mc_saved_data->mc_saved_count; 116 117 if (!mc_saved_data->mc_saved) { 118 copy_initrd_ptrs(mc_saved_tmp, initrd, initrd_start, count); 119 120 return load_microcode_early(mc_saved_tmp, count, uci); 121 } else { 122#ifdef CONFIG_X86_32 123 microcode_phys(mc_saved_tmp, mc_saved_data); 124 return load_microcode_early(mc_saved_tmp, count, uci); 125#else 126 return load_microcode_early(mc_saved_data->mc_saved, 127 count, uci); 128#endif 129 } 130} 131 132/* 133 * Given CPU signature and a microcode patch, this function finds if the 134 * microcode patch has matching family and model with the CPU. 135 */ 136static enum ucode_state 137matching_model_microcode(struct microcode_header_intel *mc_header, 138 unsigned long sig) 139{ 140 unsigned int fam, model; 141 unsigned int fam_ucode, model_ucode; 142 struct extended_sigtable *ext_header; 143 unsigned long total_size = get_totalsize(mc_header); 144 unsigned long data_size = get_datasize(mc_header); 145 int ext_sigcount, i; 146 struct extended_signature *ext_sig; 147 148 fam = __x86_family(sig); 149 model = x86_model(sig); 150 151 fam_ucode = __x86_family(mc_header->sig); 152 model_ucode = x86_model(mc_header->sig); 153 154 if (fam == fam_ucode && model == model_ucode) 155 return UCODE_OK; 156 157 /* Look for ext. headers: */ 158 if (total_size <= data_size + MC_HEADER_SIZE) 159 return UCODE_NFOUND; 160 161 ext_header = (void *) mc_header + data_size + MC_HEADER_SIZE; 162 ext_sig = (void *)ext_header + EXT_HEADER_SIZE; 163 ext_sigcount = ext_header->count; 164 165 for (i = 0; i < ext_sigcount; i++) { 166 fam_ucode = __x86_family(ext_sig->sig); 167 model_ucode = x86_model(ext_sig->sig); 168 169 if (fam == fam_ucode && model == model_ucode) 170 return UCODE_OK; 171 172 ext_sig++; 173 } 174 return UCODE_NFOUND; 175} 176 177static int 178save_microcode(struct mc_saved_data *mc_saved_data, 179 struct microcode_intel **mc_saved_src, 180 unsigned int mc_saved_count) 181{ 182 int i, j; 183 struct microcode_intel **saved_ptr; 184 int ret; 185 186 if (!mc_saved_count) 187 return -EINVAL; 188 189 /* 190 * Copy new microcode data. 191 */ 192 saved_ptr = kcalloc(mc_saved_count, sizeof(struct microcode_intel *), GFP_KERNEL); 193 if (!saved_ptr) 194 return -ENOMEM; 195 196 for (i = 0; i < mc_saved_count; i++) { 197 struct microcode_header_intel *mc_hdr; 198 struct microcode_intel *mc; 199 unsigned long size; 200 201 if (!mc_saved_src[i]) { 202 ret = -EINVAL; 203 goto err; 204 } 205 206 mc = mc_saved_src[i]; 207 mc_hdr = &mc->hdr; 208 size = get_totalsize(mc_hdr); 209 210 saved_ptr[i] = kmalloc(size, GFP_KERNEL); 211 if (!saved_ptr[i]) { 212 ret = -ENOMEM; 213 goto err; 214 } 215 216 memcpy(saved_ptr[i], mc, size); 217 } 218 219 /* 220 * Point to newly saved microcode. 221 */ 222 mc_saved_data->mc_saved = saved_ptr; 223 mc_saved_data->mc_saved_count = mc_saved_count; 224 225 return 0; 226 227err: 228 for (j = 0; j <= i; j++) 229 kfree(saved_ptr[j]); 230 kfree(saved_ptr); 231 232 return ret; 233} 234 235/* 236 * A microcode patch in ucode_ptr is saved into mc_saved 237 * - if it has matching signature and newer revision compared to an existing 238 * patch mc_saved. 239 * - or if it is a newly discovered microcode patch. 240 * 241 * The microcode patch should have matching model with CPU. 242 * 243 * Returns: The updated number @num_saved of saved microcode patches. 244 */ 245static unsigned int _save_mc(struct microcode_intel **mc_saved, 246 u8 *ucode_ptr, unsigned int num_saved) 247{ 248 struct microcode_header_intel *mc_hdr, *mc_saved_hdr; 249 unsigned int sig, pf, new_rev; 250 int found = 0, i; 251 252 mc_hdr = (struct microcode_header_intel *)ucode_ptr; 253 254 for (i = 0; i < num_saved; i++) { 255 mc_saved_hdr = (struct microcode_header_intel *)mc_saved[i]; 256 sig = mc_saved_hdr->sig; 257 pf = mc_saved_hdr->pf; 258 new_rev = mc_hdr->rev; 259 260 if (!get_matching_sig(sig, pf, new_rev, ucode_ptr)) 261 continue; 262 263 found = 1; 264 265 if (!revision_is_newer(mc_hdr, new_rev)) 266 continue; 267 268 /* 269 * Found an older ucode saved earlier. Replace it with 270 * this newer one. 271 */ 272 mc_saved[i] = (struct microcode_intel *)ucode_ptr; 273 break; 274 } 275 276 /* Newly detected microcode, save it to memory. */ 277 if (i >= num_saved && !found) 278 mc_saved[num_saved++] = (struct microcode_intel *)ucode_ptr; 279 280 return num_saved; 281} 282 283/* 284 * Get microcode matching with BSP's model. Only CPUs with the same model as 285 * BSP can stay in the platform. 286 */ 287static enum ucode_state __init 288get_matching_model_microcode(int cpu, unsigned long start, 289 void *data, size_t size, 290 struct mc_saved_data *mc_saved_data, 291 unsigned long *mc_saved_in_initrd, 292 struct ucode_cpu_info *uci) 293{ 294 u8 *ucode_ptr = data; 295 unsigned int leftover = size; 296 enum ucode_state state = UCODE_OK; 297 unsigned int mc_size; 298 struct microcode_header_intel *mc_header; 299 struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT]; 300 unsigned int mc_saved_count = mc_saved_data->mc_saved_count; 301 int i; 302 303 while (leftover && mc_saved_count < ARRAY_SIZE(mc_saved_tmp)) { 304 305 if (leftover < sizeof(mc_header)) 306 break; 307 308 mc_header = (struct microcode_header_intel *)ucode_ptr; 309 310 mc_size = get_totalsize(mc_header); 311 if (!mc_size || mc_size > leftover || 312 microcode_sanity_check(ucode_ptr, 0) < 0) 313 break; 314 315 leftover -= mc_size; 316 317 /* 318 * Since APs with same family and model as the BSP may boot in 319 * the platform, we need to find and save microcode patches 320 * with the same family and model as the BSP. 321 */ 322 if (matching_model_microcode(mc_header, uci->cpu_sig.sig) != 323 UCODE_OK) { 324 ucode_ptr += mc_size; 325 continue; 326 } 327 328 mc_saved_count = _save_mc(mc_saved_tmp, ucode_ptr, mc_saved_count); 329 330 ucode_ptr += mc_size; 331 } 332 333 if (leftover) { 334 state = UCODE_ERROR; 335 goto out; 336 } 337 338 if (mc_saved_count == 0) { 339 state = UCODE_NFOUND; 340 goto out; 341 } 342 343 for (i = 0; i < mc_saved_count; i++) 344 mc_saved_in_initrd[i] = (unsigned long)mc_saved_tmp[i] - start; 345 346 mc_saved_data->mc_saved_count = mc_saved_count; 347out: 348 return state; 349} 350 351static int collect_cpu_info_early(struct ucode_cpu_info *uci) 352{ 353 unsigned int val[2]; 354 unsigned int family, model; 355 struct cpu_signature csig; 356 unsigned int eax, ebx, ecx, edx; 357 358 csig.sig = 0; 359 csig.pf = 0; 360 csig.rev = 0; 361 362 memset(uci, 0, sizeof(*uci)); 363 364 eax = 0x00000001; 365 ecx = 0; 366 native_cpuid(&eax, &ebx, &ecx, &edx); 367 csig.sig = eax; 368 369 family = __x86_family(csig.sig); 370 model = x86_model(csig.sig); 371 372 if ((model >= 5) || (family > 6)) { 373 /* get processor flags from MSR 0x17 */ 374 native_rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]); 375 csig.pf = 1 << ((val[1] >> 18) & 7); 376 } 377 native_wrmsr(MSR_IA32_UCODE_REV, 0, 0); 378 379 /* As documented in the SDM: Do a CPUID 1 here */ 380 sync_core(); 381 382 /* get the current revision from MSR 0x8B */ 383 native_rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]); 384 385 csig.rev = val[1]; 386 387 uci->cpu_sig = csig; 388 uci->valid = 1; 389 390 return 0; 391} 392 393#ifdef DEBUG 394static void __ref show_saved_mc(void) 395{ 396 int i, j; 397 unsigned int sig, pf, rev, total_size, data_size, date; 398 struct ucode_cpu_info uci; 399 400 if (mc_saved_data.mc_saved_count == 0) { 401 pr_debug("no microcode data saved.\n"); 402 return; 403 } 404 pr_debug("Total microcode saved: %d\n", mc_saved_data.mc_saved_count); 405 406 collect_cpu_info_early(&uci); 407 408 sig = uci.cpu_sig.sig; 409 pf = uci.cpu_sig.pf; 410 rev = uci.cpu_sig.rev; 411 pr_debug("CPU: sig=0x%x, pf=0x%x, rev=0x%x\n", sig, pf, rev); 412 413 for (i = 0; i < mc_saved_data.mc_saved_count; i++) { 414 struct microcode_header_intel *mc_saved_header; 415 struct extended_sigtable *ext_header; 416 int ext_sigcount; 417 struct extended_signature *ext_sig; 418 419 mc_saved_header = (struct microcode_header_intel *) 420 mc_saved_data.mc_saved[i]; 421 sig = mc_saved_header->sig; 422 pf = mc_saved_header->pf; 423 rev = mc_saved_header->rev; 424 total_size = get_totalsize(mc_saved_header); 425 data_size = get_datasize(mc_saved_header); 426 date = mc_saved_header->date; 427 428 pr_debug("mc_saved[%d]: sig=0x%x, pf=0x%x, rev=0x%x, toal size=0x%x, date = %04x-%02x-%02x\n", 429 i, sig, pf, rev, total_size, 430 date & 0xffff, 431 date >> 24, 432 (date >> 16) & 0xff); 433 434 /* Look for ext. headers: */ 435 if (total_size <= data_size + MC_HEADER_SIZE) 436 continue; 437 438 ext_header = (void *) mc_saved_header + data_size + MC_HEADER_SIZE; 439 ext_sigcount = ext_header->count; 440 ext_sig = (void *)ext_header + EXT_HEADER_SIZE; 441 442 for (j = 0; j < ext_sigcount; j++) { 443 sig = ext_sig->sig; 444 pf = ext_sig->pf; 445 446 pr_debug("\tExtended[%d]: sig=0x%x, pf=0x%x\n", 447 j, sig, pf); 448 449 ext_sig++; 450 } 451 452 } 453} 454#else 455static inline void show_saved_mc(void) 456{ 457} 458#endif 459 460#if defined(CONFIG_MICROCODE_INTEL_EARLY) && defined(CONFIG_HOTPLUG_CPU) 461static DEFINE_MUTEX(x86_cpu_microcode_mutex); 462/* 463 * Save this mc into mc_saved_data. So it will be loaded early when a CPU is 464 * hot added or resumes. 465 * 466 * Please make sure this mc should be a valid microcode patch before calling 467 * this function. 468 */ 469int save_mc_for_early(u8 *mc) 470{ 471 struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT]; 472 unsigned int mc_saved_count_init; 473 unsigned int mc_saved_count; 474 struct microcode_intel **mc_saved; 475 int ret = 0; 476 int i; 477 478 /* 479 * Hold hotplug lock so mc_saved_data is not accessed by a CPU in 480 * hotplug. 481 */ 482 mutex_lock(&x86_cpu_microcode_mutex); 483 484 mc_saved_count_init = mc_saved_data.mc_saved_count; 485 mc_saved_count = mc_saved_data.mc_saved_count; 486 mc_saved = mc_saved_data.mc_saved; 487 488 if (mc_saved && mc_saved_count) 489 memcpy(mc_saved_tmp, mc_saved, 490 mc_saved_count * sizeof(struct microcode_intel *)); 491 /* 492 * Save the microcode patch mc in mc_save_tmp structure if it's a newer 493 * version. 494 */ 495 mc_saved_count = _save_mc(mc_saved_tmp, mc, mc_saved_count); 496 497 /* 498 * Save the mc_save_tmp in global mc_saved_data. 499 */ 500 ret = save_microcode(&mc_saved_data, mc_saved_tmp, mc_saved_count); 501 if (ret) { 502 pr_err("Cannot save microcode patch.\n"); 503 goto out; 504 } 505 506 show_saved_mc(); 507 508 /* 509 * Free old saved microcode data. 510 */ 511 if (mc_saved) { 512 for (i = 0; i < mc_saved_count_init; i++) 513 kfree(mc_saved[i]); 514 kfree(mc_saved); 515 } 516 517out: 518 mutex_unlock(&x86_cpu_microcode_mutex); 519 520 return ret; 521} 522EXPORT_SYMBOL_GPL(save_mc_for_early); 523#endif 524 525static __initdata char ucode_name[] = "kernel/x86/microcode/GenuineIntel.bin"; 526static __init enum ucode_state 527scan_microcode(struct mc_saved_data *mc_saved_data, unsigned long *initrd, 528 unsigned long start, unsigned long size, 529 struct ucode_cpu_info *uci) 530{ 531 struct cpio_data cd; 532 long offset = 0; 533#ifdef CONFIG_X86_32 534 char *p = (char *)__pa_nodebug(ucode_name); 535#else 536 char *p = ucode_name; 537#endif 538 539 cd.data = NULL; 540 cd.size = 0; 541 542 cd = find_cpio_data(p, (void *)start, size, &offset); 543 if (!cd.data) 544 return UCODE_ERROR; 545 546 return get_matching_model_microcode(0, start, cd.data, cd.size, 547 mc_saved_data, initrd, uci); 548} 549 550/* 551 * Print ucode update info. 552 */ 553static void 554print_ucode_info(struct ucode_cpu_info *uci, unsigned int date) 555{ 556 int cpu = smp_processor_id(); 557 558 pr_info("CPU%d microcode updated early to revision 0x%x, date = %04x-%02x-%02x\n", 559 cpu, 560 uci->cpu_sig.rev, 561 date & 0xffff, 562 date >> 24, 563 (date >> 16) & 0xff); 564} 565 566#ifdef CONFIG_X86_32 567 568static int delay_ucode_info; 569static int current_mc_date; 570 571/* 572 * Print early updated ucode info after printk works. This is delayed info dump. 573 */ 574void show_ucode_info_early(void) 575{ 576 struct ucode_cpu_info uci; 577 578 if (delay_ucode_info) { 579 collect_cpu_info_early(&uci); 580 print_ucode_info(&uci, current_mc_date); 581 delay_ucode_info = 0; 582 } 583} 584 585/* 586 * At this point, we can not call printk() yet. Keep microcode patch number in 587 * mc_saved_data.mc_saved and delay printing microcode info in 588 * show_ucode_info_early() until printk() works. 589 */ 590static void print_ucode(struct ucode_cpu_info *uci) 591{ 592 struct microcode_intel *mc_intel; 593 int *delay_ucode_info_p; 594 int *current_mc_date_p; 595 596 mc_intel = uci->mc; 597 if (mc_intel == NULL) 598 return; 599 600 delay_ucode_info_p = (int *)__pa_nodebug(&delay_ucode_info); 601 current_mc_date_p = (int *)__pa_nodebug(¤t_mc_date); 602 603 *delay_ucode_info_p = 1; 604 *current_mc_date_p = mc_intel->hdr.date; 605} 606#else 607 608/* 609 * Flush global tlb. We only do this in x86_64 where paging has been enabled 610 * already and PGE should be enabled as well. 611 */ 612static inline void flush_tlb_early(void) 613{ 614 __native_flush_tlb_global_irq_disabled(); 615} 616 617static inline void print_ucode(struct ucode_cpu_info *uci) 618{ 619 struct microcode_intel *mc_intel; 620 621 mc_intel = uci->mc; 622 if (mc_intel == NULL) 623 return; 624 625 print_ucode_info(uci, mc_intel->hdr.date); 626} 627#endif 628 629static int apply_microcode_early(struct ucode_cpu_info *uci, bool early) 630{ 631 struct microcode_intel *mc_intel; 632 unsigned int val[2]; 633 634 mc_intel = uci->mc; 635 if (mc_intel == NULL) 636 return 0; 637 638 /* write microcode via MSR 0x79 */ 639 native_wrmsr(MSR_IA32_UCODE_WRITE, 640 (unsigned long) mc_intel->bits, 641 (unsigned long) mc_intel->bits >> 16 >> 16); 642 native_wrmsr(MSR_IA32_UCODE_REV, 0, 0); 643 644 /* As documented in the SDM: Do a CPUID 1 here */ 645 sync_core(); 646 647 /* get the current revision from MSR 0x8B */ 648 native_rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]); 649 if (val[1] != mc_intel->hdr.rev) 650 return -1; 651 652#ifdef CONFIG_X86_64 653 /* Flush global tlb. This is precaution. */ 654 flush_tlb_early(); 655#endif 656 uci->cpu_sig.rev = val[1]; 657 658 if (early) 659 print_ucode(uci); 660 else 661 print_ucode_info(uci, mc_intel->hdr.date); 662 663 return 0; 664} 665 666/* 667 * This function converts microcode patch offsets previously stored in 668 * mc_saved_in_initrd to pointers and stores the pointers in mc_saved_data. 669 */ 670int __init save_microcode_in_initrd_intel(void) 671{ 672 unsigned int count = mc_saved_data.mc_saved_count; 673 struct microcode_intel *mc_saved[MAX_UCODE_COUNT]; 674 int ret = 0; 675 676 if (count == 0) 677 return ret; 678 679 copy_initrd_ptrs(mc_saved, mc_saved_in_initrd, initrd_start, count); 680 ret = save_microcode(&mc_saved_data, mc_saved, count); 681 if (ret) 682 pr_err("Cannot save microcode patches from initrd.\n"); 683 684 show_saved_mc(); 685 686 return ret; 687} 688 689static void __init 690_load_ucode_intel_bsp(struct mc_saved_data *mc_saved_data, 691 unsigned long *initrd, 692 unsigned long start, unsigned long size) 693{ 694 struct ucode_cpu_info uci; 695 enum ucode_state ret; 696 697 collect_cpu_info_early(&uci); 698 699 ret = scan_microcode(mc_saved_data, initrd, start, size, &uci); 700 if (ret != UCODE_OK) 701 return; 702 703 ret = load_microcode(mc_saved_data, initrd, start, &uci); 704 if (ret != UCODE_OK) 705 return; 706 707 apply_microcode_early(&uci, true); 708} 709 710void __init load_ucode_intel_bsp(void) 711{ 712 u64 start, size; 713#ifdef CONFIG_X86_32 714 struct boot_params *p; 715 716 p = (struct boot_params *)__pa_nodebug(&boot_params); 717 start = p->hdr.ramdisk_image; 718 size = p->hdr.ramdisk_size; 719 720 _load_ucode_intel_bsp( 721 (struct mc_saved_data *)__pa_nodebug(&mc_saved_data), 722 (unsigned long *)__pa_nodebug(&mc_saved_in_initrd), 723 start, size); 724#else 725 start = boot_params.hdr.ramdisk_image + PAGE_OFFSET; 726 size = boot_params.hdr.ramdisk_size; 727 728 _load_ucode_intel_bsp(&mc_saved_data, mc_saved_in_initrd, start, size); 729#endif 730} 731 732void load_ucode_intel_ap(void) 733{ 734 struct mc_saved_data *mc_saved_data_p; 735 struct ucode_cpu_info uci; 736 unsigned long *mc_saved_in_initrd_p; 737 unsigned long initrd_start_addr; 738 enum ucode_state ret; 739#ifdef CONFIG_X86_32 740 unsigned long *initrd_start_p; 741 742 mc_saved_in_initrd_p = 743 (unsigned long *)__pa_nodebug(mc_saved_in_initrd); 744 mc_saved_data_p = (struct mc_saved_data *)__pa_nodebug(&mc_saved_data); 745 initrd_start_p = (unsigned long *)__pa_nodebug(&initrd_start); 746 initrd_start_addr = (unsigned long)__pa_nodebug(*initrd_start_p); 747#else 748 mc_saved_data_p = &mc_saved_data; 749 mc_saved_in_initrd_p = mc_saved_in_initrd; 750 initrd_start_addr = initrd_start; 751#endif 752 753 /* 754 * If there is no valid ucode previously saved in memory, no need to 755 * update ucode on this AP. 756 */ 757 if (mc_saved_data_p->mc_saved_count == 0) 758 return; 759 760 collect_cpu_info_early(&uci); 761 ret = load_microcode(mc_saved_data_p, mc_saved_in_initrd_p, 762 initrd_start_addr, &uci); 763 764 if (ret != UCODE_OK) 765 return; 766 767 apply_microcode_early(&uci, true); 768} 769 770void reload_ucode_intel(void) 771{ 772 struct ucode_cpu_info uci; 773 enum ucode_state ret; 774 775 if (!mc_saved_data.mc_saved_count) 776 return; 777 778 collect_cpu_info_early(&uci); 779 780 ret = load_microcode_early(mc_saved_data.mc_saved, 781 mc_saved_data.mc_saved_count, &uci); 782 if (ret != UCODE_OK) 783 return; 784 785 apply_microcode_early(&uci, false); 786} 787