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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#include <linux/module.h>
20#include <linux/mm.h>
21#include <linux/slab.h>
22#include <linux/earlycpio.h>
23#include <linux/initrd.h>
24#include <linux/cpu.h>
25#include <asm/msr.h>
26#include <asm/microcode_intel.h>
27#include <asm/processor.h>
28#include <asm/tlbflush.h>
29#include <asm/setup.h>
30
31unsigned long mc_saved_in_initrd[MAX_UCODE_COUNT];
32struct mc_saved_data {
33 unsigned int mc_saved_count;
34 struct microcode_intel **mc_saved;
35} mc_saved_data;
36
37static enum ucode_state
38generic_load_microcode_early(struct microcode_intel **mc_saved_p,
39 unsigned int mc_saved_count,
40 struct ucode_cpu_info *uci)
41{
42 struct microcode_intel *ucode_ptr, *new_mc = NULL;
43 int new_rev = uci->cpu_sig.rev;
44 enum ucode_state state = UCODE_OK;
45 unsigned int mc_size;
46 struct microcode_header_intel *mc_header;
47 unsigned int csig = uci->cpu_sig.sig;
48 unsigned int cpf = uci->cpu_sig.pf;
49 int i;
50
51 for (i = 0; i < mc_saved_count; i++) {
52 ucode_ptr = mc_saved_p[i];
53
54 mc_header = (struct microcode_header_intel *)ucode_ptr;
55 mc_size = get_totalsize(mc_header);
56 if (get_matching_microcode(csig, cpf, ucode_ptr, new_rev)) {
57 new_rev = mc_header->rev;
58 new_mc = ucode_ptr;
59 }
60 }
61
62 if (!new_mc) {
63 state = UCODE_NFOUND;
64 goto out;
65 }
66
67 uci->mc = (struct microcode_intel *)new_mc;
68out:
69 return state;
70}
71
72static void
73microcode_pointer(struct microcode_intel **mc_saved,
74 unsigned long *mc_saved_in_initrd,
75 unsigned long initrd_start, int mc_saved_count)
76{
77 int i;
78
79 for (i = 0; i < mc_saved_count; i++)
80 mc_saved[i] = (struct microcode_intel *)
81 (mc_saved_in_initrd[i] + initrd_start);
82}
83
84#ifdef CONFIG_X86_32
85static void
86microcode_phys(struct microcode_intel **mc_saved_tmp,
87 struct mc_saved_data *mc_saved_data)
88{
89 int i;
90 struct microcode_intel ***mc_saved;
91
92 mc_saved = (struct microcode_intel ***)
93 __pa_nodebug(&mc_saved_data->mc_saved);
94 for (i = 0; i < mc_saved_data->mc_saved_count; i++) {
95 struct microcode_intel *p;
96
97 p = *(struct microcode_intel **)
98 __pa_nodebug(mc_saved_data->mc_saved + i);
99 mc_saved_tmp[i] = (struct microcode_intel *)__pa_nodebug(p);
100 }
101}
102#endif
103
104static enum ucode_state
105load_microcode(struct mc_saved_data *mc_saved_data,
106 unsigned long *mc_saved_in_initrd,
107 unsigned long initrd_start,
108 struct ucode_cpu_info *uci)
109{
110 struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
111 unsigned int count = mc_saved_data->mc_saved_count;
112
113 if (!mc_saved_data->mc_saved) {
114 microcode_pointer(mc_saved_tmp, mc_saved_in_initrd,
115 initrd_start, count);
116
117 return generic_load_microcode_early(mc_saved_tmp, count, uci);
118 } else {
119#ifdef CONFIG_X86_32
120 microcode_phys(mc_saved_tmp, mc_saved_data);
121 return generic_load_microcode_early(mc_saved_tmp, count, uci);
122#else
123 return generic_load_microcode_early(mc_saved_data->mc_saved,
124 count, uci);
125#endif
126 }
127}
128
129static u8 get_x86_family(unsigned long sig)
130{
131 u8 x86;
132
133 x86 = (sig >> 8) & 0xf;
134
135 if (x86 == 0xf)
136 x86 += (sig >> 20) & 0xff;
137
138 return x86;
139}
140
141static u8 get_x86_model(unsigned long sig)
142{
143 u8 x86, x86_model;
144
145 x86 = get_x86_family(sig);
146 x86_model = (sig >> 4) & 0xf;
147
148 if (x86 == 0x6 || x86 == 0xf)
149 x86_model += ((sig >> 16) & 0xf) << 4;
150
151 return x86_model;
152}
153
154/*
155 * Given CPU signature and a microcode patch, this function finds if the
156 * microcode patch has matching family and model with the CPU.
157 */
158static enum ucode_state
159matching_model_microcode(struct microcode_header_intel *mc_header,
160 unsigned long sig)
161{
162 u8 x86, x86_model;
163 u8 x86_ucode, x86_model_ucode;
164 struct extended_sigtable *ext_header;
165 unsigned long total_size = get_totalsize(mc_header);
166 unsigned long data_size = get_datasize(mc_header);
167 int ext_sigcount, i;
168 struct extended_signature *ext_sig;
169
170 x86 = get_x86_family(sig);
171 x86_model = get_x86_model(sig);
172
173 x86_ucode = get_x86_family(mc_header->sig);
174 x86_model_ucode = get_x86_model(mc_header->sig);
175
176 if (x86 == x86_ucode && x86_model == x86_model_ucode)
177 return UCODE_OK;
178
179 /* Look for ext. headers: */
180 if (total_size <= data_size + MC_HEADER_SIZE)
181 return UCODE_NFOUND;
182
183 ext_header = (struct extended_sigtable *)
184 mc_header + data_size + MC_HEADER_SIZE;
185 ext_sigcount = ext_header->count;
186 ext_sig = (void *)ext_header + EXT_HEADER_SIZE;
187
188 for (i = 0; i < ext_sigcount; i++) {
189 x86_ucode = get_x86_family(ext_sig->sig);
190 x86_model_ucode = get_x86_model(ext_sig->sig);
191
192 if (x86 == x86_ucode && x86_model == x86_model_ucode)
193 return UCODE_OK;
194
195 ext_sig++;
196 }
197
198 return UCODE_NFOUND;
199}
200
201static int
202save_microcode(struct mc_saved_data *mc_saved_data,
203 struct microcode_intel **mc_saved_src,
204 unsigned int mc_saved_count)
205{
206 int i, j;
207 struct microcode_intel **mc_saved_p;
208 int ret;
209
210 if (!mc_saved_count)
211 return -EINVAL;
212
213 /*
214 * Copy new microcode data.
215 */
216 mc_saved_p = kmalloc(mc_saved_count*sizeof(struct microcode_intel *),
217 GFP_KERNEL);
218 if (!mc_saved_p)
219 return -ENOMEM;
220
221 for (i = 0; i < mc_saved_count; i++) {
222 struct microcode_intel *mc = mc_saved_src[i];
223 struct microcode_header_intel *mc_header = &mc->hdr;
224 unsigned long mc_size = get_totalsize(mc_header);
225 mc_saved_p[i] = kmalloc(mc_size, GFP_KERNEL);
226 if (!mc_saved_p[i]) {
227 ret = -ENOMEM;
228 goto err;
229 }
230 if (!mc_saved_src[i]) {
231 ret = -EINVAL;
232 goto err;
233 }
234 memcpy(mc_saved_p[i], mc, mc_size);
235 }
236
237 /*
238 * Point to newly saved microcode.
239 */
240 mc_saved_data->mc_saved = mc_saved_p;
241 mc_saved_data->mc_saved_count = mc_saved_count;
242
243 return 0;
244
245err:
246 for (j = 0; j <= i; j++)
247 kfree(mc_saved_p[j]);
248 kfree(mc_saved_p);
249
250 return ret;
251}
252
253/*
254 * A microcode patch in ucode_ptr is saved into mc_saved
255 * - if it has matching signature and newer revision compared to an existing
256 * patch mc_saved.
257 * - or if it is a newly discovered microcode patch.
258 *
259 * The microcode patch should have matching model with CPU.
260 */
261static void _save_mc(struct microcode_intel **mc_saved, u8 *ucode_ptr,
262 unsigned int *mc_saved_count_p)
263{
264 int i;
265 int found = 0;
266 unsigned int mc_saved_count = *mc_saved_count_p;
267 struct microcode_header_intel *mc_header;
268
269 mc_header = (struct microcode_header_intel *)ucode_ptr;
270 for (i = 0; i < mc_saved_count; i++) {
271 unsigned int sig, pf;
272 unsigned int new_rev;
273 struct microcode_header_intel *mc_saved_header =
274 (struct microcode_header_intel *)mc_saved[i];
275 sig = mc_saved_header->sig;
276 pf = mc_saved_header->pf;
277 new_rev = mc_header->rev;
278
279 if (get_matching_sig(sig, pf, ucode_ptr, new_rev)) {
280 found = 1;
281 if (update_match_revision(mc_header, new_rev)) {
282 /*
283 * Found an older ucode saved before.
284 * Replace the older one with this newer
285 * one.
286 */
287 mc_saved[i] =
288 (struct microcode_intel *)ucode_ptr;
289 break;
290 }
291 }
292 }
293 if (i >= mc_saved_count && !found)
294 /*
295 * This ucode is first time discovered in ucode file.
296 * Save it to memory.
297 */
298 mc_saved[mc_saved_count++] =
299 (struct microcode_intel *)ucode_ptr;
300
301 *mc_saved_count_p = mc_saved_count;
302}
303
304/*
305 * Get microcode matching with BSP's model. Only CPUs with the same model as
306 * BSP can stay in the platform.
307 */
308static enum ucode_state __init
309get_matching_model_microcode(int cpu, unsigned long start,
310 void *data, size_t size,
311 struct mc_saved_data *mc_saved_data,
312 unsigned long *mc_saved_in_initrd,
313 struct ucode_cpu_info *uci)
314{
315 u8 *ucode_ptr = data;
316 unsigned int leftover = size;
317 enum ucode_state state = UCODE_OK;
318 unsigned int mc_size;
319 struct microcode_header_intel *mc_header;
320 struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
321 unsigned int mc_saved_count = mc_saved_data->mc_saved_count;
322 int i;
323
324 while (leftover) {
325 mc_header = (struct microcode_header_intel *)ucode_ptr;
326
327 mc_size = get_totalsize(mc_header);
328 if (!mc_size || mc_size > leftover ||
329 microcode_sanity_check(ucode_ptr, 0) < 0)
330 break;
331
332 leftover -= mc_size;
333
334 /*
335 * Since APs with same family and model as the BSP may boot in
336 * the platform, we need to find and save microcode patches
337 * with the same family and model as the BSP.
338 */
339 if (matching_model_microcode(mc_header, uci->cpu_sig.sig) !=
340 UCODE_OK) {
341 ucode_ptr += mc_size;
342 continue;
343 }
344
345 _save_mc(mc_saved_tmp, ucode_ptr, &mc_saved_count);
346
347 ucode_ptr += mc_size;
348 }
349
350 if (leftover) {
351 state = UCODE_ERROR;
352 goto out;
353 }
354
355 if (mc_saved_count == 0) {
356 state = UCODE_NFOUND;
357 goto out;
358 }
359
360 for (i = 0; i < mc_saved_count; i++)
361 mc_saved_in_initrd[i] = (unsigned long)mc_saved_tmp[i] - start;
362
363 mc_saved_data->mc_saved_count = mc_saved_count;
364out:
365 return state;
366}
367
368static int collect_cpu_info_early(struct ucode_cpu_info *uci)
369{
370 unsigned int val[2];
371 u8 x86, x86_model;
372 struct cpu_signature csig;
373 unsigned int eax, ebx, ecx, edx;
374
375 csig.sig = 0;
376 csig.pf = 0;
377 csig.rev = 0;
378
379 memset(uci, 0, sizeof(*uci));
380
381 eax = 0x00000001;
382 ecx = 0;
383 native_cpuid(&eax, &ebx, &ecx, &edx);
384 csig.sig = eax;
385
386 x86 = get_x86_family(csig.sig);
387 x86_model = get_x86_model(csig.sig);
388
389 if ((x86_model >= 5) || (x86 > 6)) {
390 /* get processor flags from MSR 0x17 */
391 native_rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
392 csig.pf = 1 << ((val[1] >> 18) & 7);
393 }
394 native_wrmsr(MSR_IA32_UCODE_REV, 0, 0);
395
396 /* As documented in the SDM: Do a CPUID 1 here */
397 sync_core();
398
399 /* get the current revision from MSR 0x8B */
400 native_rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
401
402 csig.rev = val[1];
403
404 uci->cpu_sig = csig;
405 uci->valid = 1;
406
407 return 0;
408}
409
410#ifdef DEBUG
411static void __ref show_saved_mc(void)
412{
413 int i, j;
414 unsigned int sig, pf, rev, total_size, data_size, date;
415 struct ucode_cpu_info uci;
416
417 if (mc_saved_data.mc_saved_count == 0) {
418 pr_debug("no micorcode data saved.\n");
419 return;
420 }
421 pr_debug("Total microcode saved: %d\n", mc_saved_data.mc_saved_count);
422
423 collect_cpu_info_early(&uci);
424
425 sig = uci.cpu_sig.sig;
426 pf = uci.cpu_sig.pf;
427 rev = uci.cpu_sig.rev;
428 pr_debug("CPU%d: sig=0x%x, pf=0x%x, rev=0x%x\n",
429 smp_processor_id(), sig, pf, rev);
430
431 for (i = 0; i < mc_saved_data.mc_saved_count; i++) {
432 struct microcode_header_intel *mc_saved_header;
433 struct extended_sigtable *ext_header;
434 int ext_sigcount;
435 struct extended_signature *ext_sig;
436
437 mc_saved_header = (struct microcode_header_intel *)
438 mc_saved_data.mc_saved[i];
439 sig = mc_saved_header->sig;
440 pf = mc_saved_header->pf;
441 rev = mc_saved_header->rev;
442 total_size = get_totalsize(mc_saved_header);
443 data_size = get_datasize(mc_saved_header);
444 date = mc_saved_header->date;
445
446 pr_debug("mc_saved[%d]: sig=0x%x, pf=0x%x, rev=0x%x, toal size=0x%x, date = %04x-%02x-%02x\n",
447 i, sig, pf, rev, total_size,
448 date & 0xffff,
449 date >> 24,
450 (date >> 16) & 0xff);
451
452 /* Look for ext. headers: */
453 if (total_size <= data_size + MC_HEADER_SIZE)
454 continue;
455
456 ext_header = (struct extended_sigtable *)
457 mc_saved_header + data_size + MC_HEADER_SIZE;
458 ext_sigcount = ext_header->count;
459 ext_sig = (void *)ext_header + EXT_HEADER_SIZE;
460
461 for (j = 0; j < ext_sigcount; j++) {
462 sig = ext_sig->sig;
463 pf = ext_sig->pf;
464
465 pr_debug("\tExtended[%d]: sig=0x%x, pf=0x%x\n",
466 j, sig, pf);
467
468 ext_sig++;
469 }
470
471 }
472}
473#else
474static inline void show_saved_mc(void)
475{
476}
477#endif
478
479#if defined(CONFIG_MICROCODE_INTEL_EARLY) && defined(CONFIG_HOTPLUG_CPU)
480static DEFINE_MUTEX(x86_cpu_microcode_mutex);
481/*
482 * Save this mc into mc_saved_data. So it will be loaded early when a CPU is
483 * hot added or resumes.
484 *
485 * Please make sure this mc should be a valid microcode patch before calling
486 * this function.
487 */
488int save_mc_for_early(u8 *mc)
489{
490 struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
491 unsigned int mc_saved_count_init;
492 unsigned int mc_saved_count;
493 struct microcode_intel **mc_saved;
494 int ret = 0;
495 int i;
496
497 /*
498 * Hold hotplug lock so mc_saved_data is not accessed by a CPU in
499 * hotplug.
500 */
501 mutex_lock(&x86_cpu_microcode_mutex);
502
503 mc_saved_count_init = mc_saved_data.mc_saved_count;
504 mc_saved_count = mc_saved_data.mc_saved_count;
505 mc_saved = mc_saved_data.mc_saved;
506
507 if (mc_saved && mc_saved_count)
508 memcpy(mc_saved_tmp, mc_saved,
509 mc_saved_count * sizeof(struct mirocode_intel *));
510 /*
511 * Save the microcode patch mc in mc_save_tmp structure if it's a newer
512 * version.
513 */
514
515 _save_mc(mc_saved_tmp, mc, &mc_saved_count);
516
517 /*
518 * Save the mc_save_tmp in global mc_saved_data.
519 */
520 ret = save_microcode(&mc_saved_data, mc_saved_tmp, mc_saved_count);
521 if (ret) {
522 pr_err("Cannot save microcode patch.\n");
523 goto out;
524 }
525
526 show_saved_mc();
527
528 /*
529 * Free old saved microcod data.
530 */
531 if (mc_saved) {
532 for (i = 0; i < mc_saved_count_init; i++)
533 kfree(mc_saved[i]);
534 kfree(mc_saved);
535 }
536
537out:
538 mutex_unlock(&x86_cpu_microcode_mutex);
539
540 return ret;
541}
542EXPORT_SYMBOL_GPL(save_mc_for_early);
543#endif
544
545static __initdata char ucode_name[] = "kernel/x86/microcode/GenuineIntel.bin";
546static __init enum ucode_state
547scan_microcode(unsigned long start, unsigned long end,
548 struct mc_saved_data *mc_saved_data,
549 unsigned long *mc_saved_in_initrd,
550 struct ucode_cpu_info *uci)
551{
552 unsigned int size = end - start + 1;
553 struct cpio_data cd;
554 long offset = 0;
555#ifdef CONFIG_X86_32
556 char *p = (char *)__pa_nodebug(ucode_name);
557#else
558 char *p = ucode_name;
559#endif
560
561 cd.data = NULL;
562 cd.size = 0;
563
564 cd = find_cpio_data(p, (void *)start, size, &offset);
565 if (!cd.data)
566 return UCODE_ERROR;
567
568
569 return get_matching_model_microcode(0, start, cd.data, cd.size,
570 mc_saved_data, mc_saved_in_initrd,
571 uci);
572}
573
574/*
575 * Print ucode update info.
576 */
577static void
578print_ucode_info(struct ucode_cpu_info *uci, unsigned int date)
579{
580 int cpu = smp_processor_id();
581
582 pr_info("CPU%d microcode updated early to revision 0x%x, date = %04x-%02x-%02x\n",
583 cpu,
584 uci->cpu_sig.rev,
585 date & 0xffff,
586 date >> 24,
587 (date >> 16) & 0xff);
588}
589
590#ifdef CONFIG_X86_32
591
592static int delay_ucode_info;
593static int current_mc_date;
594
595/*
596 * Print early updated ucode info after printk works. This is delayed info dump.
597 */
598void show_ucode_info_early(void)
599{
600 struct ucode_cpu_info uci;
601
602 if (delay_ucode_info) {
603 collect_cpu_info_early(&uci);
604 print_ucode_info(&uci, current_mc_date);
605 delay_ucode_info = 0;
606 }
607}
608
609/*
610 * At this point, we can not call printk() yet. Keep microcode patch number in
611 * mc_saved_data.mc_saved and delay printing microcode info in
612 * show_ucode_info_early() until printk() works.
613 */
614static void print_ucode(struct ucode_cpu_info *uci)
615{
616 struct microcode_intel *mc_intel;
617 int *delay_ucode_info_p;
618 int *current_mc_date_p;
619
620 mc_intel = uci->mc;
621 if (mc_intel == NULL)
622 return;
623
624 delay_ucode_info_p = (int *)__pa_nodebug(&delay_ucode_info);
625 current_mc_date_p = (int *)__pa_nodebug(¤t_mc_date);
626
627 *delay_ucode_info_p = 1;
628 *current_mc_date_p = mc_intel->hdr.date;
629}
630#else
631
632/*
633 * Flush global tlb. We only do this in x86_64 where paging has been enabled
634 * already and PGE should be enabled as well.
635 */
636static inline void flush_tlb_early(void)
637{
638 __native_flush_tlb_global_irq_disabled();
639}
640
641static inline void print_ucode(struct ucode_cpu_info *uci)
642{
643 struct microcode_intel *mc_intel;
644
645 mc_intel = uci->mc;
646 if (mc_intel == NULL)
647 return;
648
649 print_ucode_info(uci, mc_intel->hdr.date);
650}
651#endif
652
653static int apply_microcode_early(struct mc_saved_data *mc_saved_data,
654 struct ucode_cpu_info *uci)
655{
656 struct microcode_intel *mc_intel;
657 unsigned int val[2];
658
659 mc_intel = uci->mc;
660 if (mc_intel == NULL)
661 return 0;
662
663 /* write microcode via MSR 0x79 */
664 native_wrmsr(MSR_IA32_UCODE_WRITE,
665 (unsigned long) mc_intel->bits,
666 (unsigned long) mc_intel->bits >> 16 >> 16);
667 native_wrmsr(MSR_IA32_UCODE_REV, 0, 0);
668
669 /* As documented in the SDM: Do a CPUID 1 here */
670 sync_core();
671
672 /* get the current revision from MSR 0x8B */
673 native_rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
674 if (val[1] != mc_intel->hdr.rev)
675 return -1;
676
677#ifdef CONFIG_X86_64
678 /* Flush global tlb. This is precaution. */
679 flush_tlb_early();
680#endif
681 uci->cpu_sig.rev = val[1];
682
683 print_ucode(uci);
684
685 return 0;
686}
687
688/*
689 * This function converts microcode patch offsets previously stored in
690 * mc_saved_in_initrd to pointers and stores the pointers in mc_saved_data.
691 */
692int __init save_microcode_in_initrd_intel(void)
693{
694 unsigned int count = mc_saved_data.mc_saved_count;
695 struct microcode_intel *mc_saved[MAX_UCODE_COUNT];
696 int ret = 0;
697
698 if (count == 0)
699 return ret;
700
701 microcode_pointer(mc_saved, mc_saved_in_initrd, initrd_start, count);
702 ret = save_microcode(&mc_saved_data, mc_saved, count);
703 if (ret)
704 pr_err("Cannot save microcode patches from initrd.\n");
705
706 show_saved_mc();
707
708 return ret;
709}
710
711static void __init
712_load_ucode_intel_bsp(struct mc_saved_data *mc_saved_data,
713 unsigned long *mc_saved_in_initrd,
714 unsigned long initrd_start_early,
715 unsigned long initrd_end_early,
716 struct ucode_cpu_info *uci)
717{
718 collect_cpu_info_early(uci);
719 scan_microcode(initrd_start_early, initrd_end_early, mc_saved_data,
720 mc_saved_in_initrd, uci);
721 load_microcode(mc_saved_data, mc_saved_in_initrd,
722 initrd_start_early, uci);
723 apply_microcode_early(mc_saved_data, uci);
724}
725
726void __init
727load_ucode_intel_bsp(void)
728{
729 u64 ramdisk_image, ramdisk_size;
730 unsigned long initrd_start_early, initrd_end_early;
731 struct ucode_cpu_info uci;
732#ifdef CONFIG_X86_32
733 struct boot_params *boot_params_p;
734
735 boot_params_p = (struct boot_params *)__pa_nodebug(&boot_params);
736 ramdisk_image = boot_params_p->hdr.ramdisk_image;
737 ramdisk_size = boot_params_p->hdr.ramdisk_size;
738 initrd_start_early = ramdisk_image;
739 initrd_end_early = initrd_start_early + ramdisk_size;
740
741 _load_ucode_intel_bsp(
742 (struct mc_saved_data *)__pa_nodebug(&mc_saved_data),
743 (unsigned long *)__pa_nodebug(&mc_saved_in_initrd),
744 initrd_start_early, initrd_end_early, &uci);
745#else
746 ramdisk_image = boot_params.hdr.ramdisk_image;
747 ramdisk_size = boot_params.hdr.ramdisk_size;
748 initrd_start_early = ramdisk_image + PAGE_OFFSET;
749 initrd_end_early = initrd_start_early + ramdisk_size;
750
751 _load_ucode_intel_bsp(&mc_saved_data, mc_saved_in_initrd,
752 initrd_start_early, initrd_end_early, &uci);
753#endif
754}
755
756void load_ucode_intel_ap(void)
757{
758 struct mc_saved_data *mc_saved_data_p;
759 struct ucode_cpu_info uci;
760 unsigned long *mc_saved_in_initrd_p;
761 unsigned long initrd_start_addr;
762#ifdef CONFIG_X86_32
763 unsigned long *initrd_start_p;
764
765 mc_saved_in_initrd_p =
766 (unsigned long *)__pa_nodebug(mc_saved_in_initrd);
767 mc_saved_data_p = (struct mc_saved_data *)__pa_nodebug(&mc_saved_data);
768 initrd_start_p = (unsigned long *)__pa_nodebug(&initrd_start);
769 initrd_start_addr = (unsigned long)__pa_nodebug(*initrd_start_p);
770#else
771 mc_saved_data_p = &mc_saved_data;
772 mc_saved_in_initrd_p = mc_saved_in_initrd;
773 initrd_start_addr = initrd_start;
774#endif
775
776 /*
777 * If there is no valid ucode previously saved in memory, no need to
778 * update ucode on this AP.
779 */
780 if (mc_saved_data_p->mc_saved_count == 0)
781 return;
782
783 collect_cpu_info_early(&uci);
784 load_microcode(mc_saved_data_p, mc_saved_in_initrd_p,
785 initrd_start_addr, &uci);
786 apply_microcode_early(mc_saved_data_p, &uci);
787}