arch/x86/kernel/microcode_intel_early.c - arm/linux-arm64-legacy - Git at Google

 /*
  *	Intel CPU microcode early update for Linux
  *
  *	Copyright (C) 2012 Fenghua Yu <fenghua.yu@intel.com>
  *			   H Peter Anvin" <hpa@zytor.com>
  *
  *	This allows to early upgrade microcode on Intel processors
  *	belonging to IA-32 family - PentiumPro, Pentium II,
  *	Pentium III, Xeon, Pentium 4, etc.
  *
  *	Reference: Section 9.11 of Volume 3, IA-32 Intel Architecture
  *	Software Developer's Manual.
  *
  *	This program is free software; you can redistribute it and/or
  *	modify it under the terms of the GNU General Public License
  *	as published by the Free Software Foundation; either version
  *	2 of the License, or (at your option) any later version.
  */
 #include <linux/module.h>
 #include <linux/mm.h>
 #include <linux/slab.h>
 #include <linux/earlycpio.h>
 #include <linux/initrd.h>
 #include <linux/cpu.h>
 #include <asm/msr.h>
 #include <asm/microcode_intel.h>
 #include <asm/processor.h>
 #include <asm/tlbflush.h>
 #include <asm/setup.h>

 unsigned long mc_saved_in_initrd[MAX_UCODE_COUNT];
 struct mc_saved_data {
 	unsigned int mc_saved_count;
 	struct microcode_intel **mc_saved;
 } mc_saved_data;

 static enum ucode_state __cpuinit
 generic_load_microcode_early(struct microcode_intel **mc_saved_p,
 			     unsigned int mc_saved_count,
 			     struct ucode_cpu_info *uci)
 {
 	struct microcode_intel *ucode_ptr, *new_mc = NULL;
 	int new_rev = uci->cpu_sig.rev;
 	enum ucode_state state = UCODE_OK;
 	unsigned int mc_size;
 	struct microcode_header_intel *mc_header;
 	unsigned int csig = uci->cpu_sig.sig;
 	unsigned int cpf = uci->cpu_sig.pf;
 	int i;

 	for (i = 0; i < mc_saved_count; i++) {
 		ucode_ptr = mc_saved_p[i];

 		mc_header = (struct microcode_header_intel *)ucode_ptr;
 		mc_size = get_totalsize(mc_header);
 		if (get_matching_microcode(csig, cpf, ucode_ptr, new_rev)) {
 			new_rev = mc_header->rev;
 			new_mc  = ucode_ptr;
 		}
 	}

 	if (!new_mc) {
 		state = UCODE_NFOUND;
 		goto out;
 	}

 	uci->mc = (struct microcode_intel *)new_mc;
 out:
 	return state;
 }

 static void __cpuinit
 microcode_pointer(struct microcode_intel **mc_saved,
 		  unsigned long *mc_saved_in_initrd,
 		  unsigned long initrd_start, int mc_saved_count)
 {
 	int i;

 	for (i = 0; i < mc_saved_count; i++)
 		mc_saved[i] = (struct microcode_intel *)
 			      (mc_saved_in_initrd[i] + initrd_start);
 }

 #ifdef CONFIG_X86_32
 static void __cpuinit
 microcode_phys(struct microcode_intel **mc_saved_tmp,
 	       struct mc_saved_data *mc_saved_data)
 {
 	int i;
 	struct microcode_intel ***mc_saved;

 	mc_saved = (struct microcode_intel ***)
 		   __pa_nodebug(&mc_saved_data->mc_saved);
 	for (i = 0; i < mc_saved_data->mc_saved_count; i++) {
 		struct microcode_intel *p;

 		p = *(struct microcode_intel **)
 			__pa_nodebug(mc_saved_data->mc_saved + i);
 		mc_saved_tmp[i] = (struct microcode_intel *)__pa_nodebug(p);
 	}
 }
 #endif

 static enum ucode_state __cpuinit
 load_microcode(struct mc_saved_data *mc_saved_data,
 	       unsigned long *mc_saved_in_initrd,
 	       unsigned long initrd_start,
 	       struct ucode_cpu_info *uci)
 {
 	struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
 	unsigned int count = mc_saved_data->mc_saved_count;

 	if (!mc_saved_data->mc_saved) {
 		microcode_pointer(mc_saved_tmp, mc_saved_in_initrd,
 				  initrd_start, count);

 		return generic_load_microcode_early(mc_saved_tmp, count, uci);
 	} else {
 #ifdef CONFIG_X86_32
 		microcode_phys(mc_saved_tmp, mc_saved_data);
 		return generic_load_microcode_early(mc_saved_tmp, count, uci);
 #else
 		return generic_load_microcode_early(mc_saved_data->mc_saved,
 						    count, uci);
 #endif
 	}
 }

 static u8 get_x86_family(unsigned long sig)
 {
 	u8 x86;

 	x86 = (sig >> 8) & 0xf;

 	if (x86 == 0xf)
 		x86 += (sig >> 20) & 0xff;

 	return x86;
 }

 static u8 get_x86_model(unsigned long sig)
 {
 	u8 x86, x86_model;

 	x86 = get_x86_family(sig);
 	x86_model = (sig >> 4) & 0xf;

 	if (x86 == 0x6 || x86 == 0xf)
 		x86_model += ((sig >> 16) & 0xf) << 4;

 	return x86_model;
 }

 /*
  * Given CPU signature and a microcode patch, this function finds if the
  * microcode patch has matching family and model with the CPU.
  */
 static enum ucode_state
 matching_model_microcode(struct microcode_header_intel *mc_header,
 			unsigned long sig)
 {
 	u8 x86, x86_model;
 	u8 x86_ucode, x86_model_ucode;
 	struct extended_sigtable *ext_header;
 	unsigned long total_size = get_totalsize(mc_header);
 	unsigned long data_size = get_datasize(mc_header);
 	int ext_sigcount, i;
 	struct extended_signature *ext_sig;

 	x86 = get_x86_family(sig);
 	x86_model = get_x86_model(sig);

 	x86_ucode = get_x86_family(mc_header->sig);
 	x86_model_ucode = get_x86_model(mc_header->sig);

 	if (x86 == x86_ucode && x86_model == x86_model_ucode)
 		return UCODE_OK;

 	/* Look for ext. headers: */
 	if (total_size <= data_size + MC_HEADER_SIZE)
 		return UCODE_NFOUND;

 	ext_header = (struct extended_sigtable *)
 		     mc_header + data_size + MC_HEADER_SIZE;
 	ext_sigcount = ext_header->count;
 	ext_sig = (void *)ext_header + EXT_HEADER_SIZE;

 	for (i = 0; i < ext_sigcount; i++) {
 		x86_ucode = get_x86_family(ext_sig->sig);
 		x86_model_ucode = get_x86_model(ext_sig->sig);

 		if (x86 == x86_ucode && x86_model == x86_model_ucode)
 			return UCODE_OK;

 		ext_sig++;
 	}

 	return UCODE_NFOUND;
 }

 static int
 save_microcode(struct mc_saved_data *mc_saved_data,
 	       struct microcode_intel **mc_saved_src,
 	       unsigned int mc_saved_count)
 {
 	int i, j;
 	struct microcode_intel **mc_saved_p;
 	int ret;

 	if (!mc_saved_count)
 		return -EINVAL;

 	/*
 	 * Copy new microcode data.
 	 */
 	mc_saved_p = kmalloc(mc_saved_count*sizeof(struct microcode_intel *),
 			     GFP_KERNEL);
 	if (!mc_saved_p)
 		return -ENOMEM;

 	for (i = 0; i < mc_saved_count; i++) {
 		struct microcode_intel *mc = mc_saved_src[i];
 		struct microcode_header_intel *mc_header = &mc->hdr;
 		unsigned long mc_size = get_totalsize(mc_header);
 		mc_saved_p[i] = kmalloc(mc_size, GFP_KERNEL);
 		if (!mc_saved_p[i]) {
 			ret = -ENOMEM;
 			goto err;
 		}
 		if (!mc_saved_src[i]) {
 			ret = -EINVAL;
 			goto err;
 		}
 		memcpy(mc_saved_p[i], mc, mc_size);
 	}

 	/*
 	 * Point to newly saved microcode.
 	 */
 	mc_saved_data->mc_saved = mc_saved_p;
 	mc_saved_data->mc_saved_count = mc_saved_count;

 	return 0;

 err:
 	for (j = 0; j <= i; j++)
 		kfree(mc_saved_p[j]);
 	kfree(mc_saved_p);

 	return ret;
 }

 /*
  * A microcode patch in ucode_ptr is saved into mc_saved
  * - if it has matching signature and newer revision compared to an existing
  *   patch mc_saved.
  * - or if it is a newly discovered microcode patch.
  *
  * The microcode patch should have matching model with CPU.
  */
 static void _save_mc(struct microcode_intel **mc_saved, u8 *ucode_ptr,
 		     unsigned int *mc_saved_count_p)
 {
 	int i;
 	int found = 0;
 	unsigned int mc_saved_count = *mc_saved_count_p;
 	struct microcode_header_intel *mc_header;

 	mc_header = (struct microcode_header_intel *)ucode_ptr;
 	for (i = 0; i < mc_saved_count; i++) {
 		unsigned int sig, pf;
 		unsigned int new_rev;
 		struct microcode_header_intel *mc_saved_header =
 			     (struct microcode_header_intel *)mc_saved[i];
 		sig = mc_saved_header->sig;
 		pf = mc_saved_header->pf;
 		new_rev = mc_header->rev;

 		if (get_matching_sig(sig, pf, ucode_ptr, new_rev)) {
 			found = 1;
 			if (update_match_revision(mc_header, new_rev)) {
 				/*
 				 * Found an older ucode saved before.
 				 * Replace the older one with this newer
 				 * one.
 				 */
 				mc_saved[i] =
 					(struct microcode_intel *)ucode_ptr;
 				break;
 			}
 		}
 	}
 	if (i >= mc_saved_count && !found)
 		/*
 		 * This ucode is first time discovered in ucode file.
 		 * Save it to memory.
 		 */
 		mc_saved[mc_saved_count++] =
 				 (struct microcode_intel *)ucode_ptr;

 	*mc_saved_count_p = mc_saved_count;
 }

 /*
  * Get microcode matching with BSP's model. Only CPUs with the same model as
  * BSP can stay in the platform.
  */
 static enum ucode_state __init
 get_matching_model_microcode(int cpu, unsigned long start,
 			     void *data, size_t size,
 			     struct mc_saved_data *mc_saved_data,
 			     unsigned long *mc_saved_in_initrd,
 			     struct ucode_cpu_info *uci)
 {
 	u8 *ucode_ptr = data;
 	unsigned int leftover = size;
 	enum ucode_state state = UCODE_OK;
 	unsigned int mc_size;
 	struct microcode_header_intel *mc_header;
 	struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
 	unsigned int mc_saved_count = mc_saved_data->mc_saved_count;
 	int i;

 	while (leftover) {
 		mc_header = (struct microcode_header_intel *)ucode_ptr;

 		mc_size = get_totalsize(mc_header);
 		if (!mc_size || mc_size > leftover ||
 			microcode_sanity_check(ucode_ptr, 0) < 0)
 			break;

 		leftover -= mc_size;

 		/*
 		 * Since APs with same family and model as the BSP may boot in
 		 * the platform, we need to find and save microcode patches
 		 * with the same family and model as the BSP.
 		 */
 		if (matching_model_microcode(mc_header, uci->cpu_sig.sig) !=
 			 UCODE_OK) {
 			ucode_ptr += mc_size;
 			continue;
 		}

 		_save_mc(mc_saved_tmp, ucode_ptr, &mc_saved_count);

 		ucode_ptr += mc_size;
 	}

 	if (leftover) {
 		state = UCODE_ERROR;
 		goto out;
 	}

 	if (mc_saved_count == 0) {
 		state = UCODE_NFOUND;
 		goto out;
 	}

 	for (i = 0; i < mc_saved_count; i++)
 		mc_saved_in_initrd[i] = (unsigned long)mc_saved_tmp[i] - start;

 	mc_saved_data->mc_saved_count = mc_saved_count;
 out:
 	return state;
 }

 #define native_rdmsr(msr, val1, val2)		\
 do {						\
 	u64 __val = native_read_msr((msr));	\
 	(void)((val1) = (u32)__val);		\
 	(void)((val2) = (u32)(__val >> 32));	\
 } while (0)

 #define native_wrmsr(msr, low, high)		\
 	native_write_msr(msr, low, high);

 static int __cpuinit collect_cpu_info_early(struct ucode_cpu_info *uci)
 {
 	unsigned int val[2];
 	u8 x86, x86_model;
 	struct cpu_signature csig;
 	unsigned int eax, ebx, ecx, edx;

 	csig.sig = 0;
 	csig.pf = 0;
 	csig.rev = 0;

 	memset(uci, 0, sizeof(*uci));

 	eax = 0x00000001;
 	ecx = 0;
 	native_cpuid(&eax, &ebx, &ecx, &edx);
 	csig.sig = eax;

 	x86 = get_x86_family(csig.sig);
 	x86_model = get_x86_model(csig.sig);

 	if ((x86_model >= 5) || (x86 > 6)) {
 		/* get processor flags from MSR 0x17 */
 		native_rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
 		csig.pf = 1 << ((val[1] >> 18) & 7);
 	}
 	native_wrmsr(MSR_IA32_UCODE_REV, 0, 0);

 	/* As documented in the SDM: Do a CPUID 1 here */
 	sync_core();

 	/* get the current revision from MSR 0x8B */
 	native_rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);

 	csig.rev = val[1];

 	uci->cpu_sig = csig;
 	uci->valid = 1;

 	return 0;
 }

 #ifdef DEBUG
 static void __ref show_saved_mc(void)
 {
 	int i, j;
 	unsigned int sig, pf, rev, total_size, data_size, date;
 	struct ucode_cpu_info uci;

 	if (mc_saved_data.mc_saved_count == 0) {
 		pr_debug("no micorcode data saved.\n");
 		return;
 	}
 	pr_debug("Total microcode saved: %d\n", mc_saved_data.mc_saved_count);

 	collect_cpu_info_early(&uci);

 	sig = uci.cpu_sig.sig;
 	pf = uci.cpu_sig.pf;
 	rev = uci.cpu_sig.rev;
 	pr_debug("CPU%d: sig=0x%x, pf=0x%x, rev=0x%x\n",
 		 smp_processor_id(), sig, pf, rev);

 	for (i = 0; i < mc_saved_data.mc_saved_count; i++) {
 		struct microcode_header_intel *mc_saved_header;
 		struct extended_sigtable *ext_header;
 		int ext_sigcount;
 		struct extended_signature *ext_sig;

 		mc_saved_header = (struct microcode_header_intel *)
 				  mc_saved_data.mc_saved[i];
 		sig = mc_saved_header->sig;
 		pf = mc_saved_header->pf;
 		rev = mc_saved_header->rev;
 		total_size = get_totalsize(mc_saved_header);
 		data_size = get_datasize(mc_saved_header);
 		date = mc_saved_header->date;

 		pr_debug("mc_saved[%d]: sig=0x%x, pf=0x%x, rev=0x%x, toal size=0x%x, date = %04x-%02x-%02x\n",
 			 i, sig, pf, rev, total_size,
 			 date & 0xffff,
 			 date >> 24,
 			 (date >> 16) & 0xff);

 		/* Look for ext. headers: */
 		if (total_size <= data_size + MC_HEADER_SIZE)
 			continue;

 		ext_header = (struct extended_sigtable *)
 			     mc_saved_header + data_size + MC_HEADER_SIZE;
 		ext_sigcount = ext_header->count;
 		ext_sig = (void *)ext_header + EXT_HEADER_SIZE;

 		for (j = 0; j < ext_sigcount; j++) {
 			sig = ext_sig->sig;
 			pf = ext_sig->pf;

 			pr_debug("\tExtended[%d]: sig=0x%x, pf=0x%x\n",
 				 j, sig, pf);

 			ext_sig++;
 		}

 	}
 }
 #else
 static inline void show_saved_mc(void)
 {
 }
 #endif

 #if defined(CONFIG_MICROCODE_INTEL_EARLY) && defined(CONFIG_HOTPLUG_CPU)
 static DEFINE_MUTEX(x86_cpu_microcode_mutex);
 /*
  * Save this mc into mc_saved_data. So it will be loaded early when a CPU is
  * hot added or resumes.
  *
  * Please make sure this mc should be a valid microcode patch before calling
  * this function.
  */
 int save_mc_for_early(u8 *mc)
 {
 	struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
 	unsigned int mc_saved_count_init;
 	unsigned int mc_saved_count;
 	struct microcode_intel **mc_saved;
 	int ret = 0;
 	int i;

 	/*
 	 * Hold hotplug lock so mc_saved_data is not accessed by a CPU in
 	 * hotplug.
 	 */
 	mutex_lock(&x86_cpu_microcode_mutex);

 	mc_saved_count_init = mc_saved_data.mc_saved_count;
 	mc_saved_count = mc_saved_data.mc_saved_count;
 	mc_saved = mc_saved_data.mc_saved;

 	if (mc_saved && mc_saved_count)
 		memcpy(mc_saved_tmp, mc_saved,
 		       mc_saved_count * sizeof(struct mirocode_intel *));
 	/*
 	 * Save the microcode patch mc in mc_save_tmp structure if it's a newer
 	 * version.
 	 */

 	_save_mc(mc_saved_tmp, mc, &mc_saved_count);

 	/*
 	 * Save the mc_save_tmp in global mc_saved_data.
 	 */
 	ret = save_microcode(&mc_saved_data, mc_saved_tmp, mc_saved_count);
 	if (ret) {
 		pr_err("Cannot save microcode patch.\n");
 		goto out;
 	}

 	show_saved_mc();

 	/*
 	 * Free old saved microcod data.
 	 */
 	if (mc_saved) {
 		for (i = 0; i < mc_saved_count_init; i++)
 			kfree(mc_saved[i]);
 		kfree(mc_saved);
 	}

 out:
 	mutex_unlock(&x86_cpu_microcode_mutex);

 	return ret;
 }
 EXPORT_SYMBOL_GPL(save_mc_for_early);
 #endif

 static __initdata char ucode_name[] = "kernel/x86/microcode/GenuineIntel.bin";
 static __init enum ucode_state
 scan_microcode(unsigned long start, unsigned long end,
 		struct mc_saved_data *mc_saved_data,
 		unsigned long *mc_saved_in_initrd,
 		struct ucode_cpu_info *uci)
 {
 	unsigned int size = end - start + 1;
 	struct cpio_data cd;
 	long offset = 0;
 #ifdef CONFIG_X86_32
 	char *p = (char *)__pa_nodebug(ucode_name);
 #else
 	char *p = ucode_name;
 #endif

 	cd.data = NULL;
 	cd.size = 0;

 	cd = find_cpio_data(p, (void *)start, size, &offset);
 	if (!cd.data)
 		return UCODE_ERROR;


 	return get_matching_model_microcode(0, start, cd.data, cd.size,
 					    mc_saved_data, mc_saved_in_initrd,
 					    uci);
 }

 /*
  * Print ucode update info.
  */
 static void __cpuinit
 print_ucode_info(struct ucode_cpu_info *uci, unsigned int date)
 {
 	int cpu = smp_processor_id();

 	pr_info("CPU%d microcode updated early to revision 0x%x, date = %04x-%02x-%02x\n",
 		cpu,
 		uci->cpu_sig.rev,
 		date & 0xffff,
 		date >> 24,
 		(date >> 16) & 0xff);
 }

 #ifdef CONFIG_X86_32

 static int delay_ucode_info;
 static int current_mc_date;

 /*
  * Print early updated ucode info after printk works. This is delayed info dump.
  */
 void __cpuinit show_ucode_info_early(void)
 {
 	struct ucode_cpu_info uci;

 	if (delay_ucode_info) {
 		collect_cpu_info_early(&uci);
 		print_ucode_info(&uci, current_mc_date);
 		delay_ucode_info = 0;
 	}
 }

 /*
  * At this point, we can not call printk() yet. Keep microcode patch number in
  * mc_saved_data.mc_saved and delay printing microcode info in
  * show_ucode_info_early() until printk() works.
  */
 static void __cpuinit print_ucode(struct ucode_cpu_info *uci)
 {
 	struct microcode_intel *mc_intel;
 	int *delay_ucode_info_p;
 	int *current_mc_date_p;

 	mc_intel = uci->mc;
 	if (mc_intel == NULL)
 		return;

 	delay_ucode_info_p = (int *)__pa_nodebug(&delay_ucode_info);
 	current_mc_date_p = (int *)__pa_nodebug(&current_mc_date);

 	*delay_ucode_info_p = 1;
 	*current_mc_date_p = mc_intel->hdr.date;
 }
 #else

 /*
  * Flush global tlb. We only do this in x86_64 where paging has been enabled
  * already and PGE should be enabled as well.
  */
 static inline void __cpuinit flush_tlb_early(void)
 {
 	__native_flush_tlb_global_irq_disabled();
 }

 static inline void __cpuinit print_ucode(struct ucode_cpu_info *uci)
 {
 	struct microcode_intel *mc_intel;

 	mc_intel = uci->mc;
 	if (mc_intel == NULL)
 		return;

 	print_ucode_info(uci, mc_intel->hdr.date);
 }
 #endif

 static int __cpuinit apply_microcode_early(struct mc_saved_data *mc_saved_data,
 					   struct ucode_cpu_info *uci)
 {
 	struct microcode_intel *mc_intel;
 	unsigned int val[2];

 	mc_intel = uci->mc;
 	if (mc_intel == NULL)
 		return 0;

 	/* write microcode via MSR 0x79 */
 	native_wrmsr(MSR_IA32_UCODE_WRITE,
 	      (unsigned long) mc_intel->bits,
 	      (unsigned long) mc_intel->bits >> 16 >> 16);
 	native_wrmsr(MSR_IA32_UCODE_REV, 0, 0);

 	/* As documented in the SDM: Do a CPUID 1 here */
 	sync_core();

 	/* get the current revision from MSR 0x8B */
 	native_rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
 	if (val[1] != mc_intel->hdr.rev)
 		return -1;

 #ifdef CONFIG_X86_64
 	/* Flush global tlb. This is precaution. */
 	flush_tlb_early();
 #endif
 	uci->cpu_sig.rev = val[1];

 	print_ucode(uci);

 	return 0;
 }

 /*
  * This function converts microcode patch offsets previously stored in
  * mc_saved_in_initrd to pointers and stores the pointers in mc_saved_data.
  */
 int __init save_microcode_in_initrd_intel(void)
 {
 	unsigned int count = mc_saved_data.mc_saved_count;
 	struct microcode_intel *mc_saved[MAX_UCODE_COUNT];
 	int ret = 0;

 	if (count == 0)
 		return ret;

 	microcode_pointer(mc_saved, mc_saved_in_initrd, initrd_start, count);
 	ret = save_microcode(&mc_saved_data, mc_saved, count);
 	if (ret)
 		pr_err("Cannot save microcode patches from initrd.\n");

 	show_saved_mc();

 	return ret;
 }

 static void __init
 _load_ucode_intel_bsp(struct mc_saved_data *mc_saved_data,
 		      unsigned long *mc_saved_in_initrd,
 		      unsigned long initrd_start_early,
 		      unsigned long initrd_end_early,
 		      struct ucode_cpu_info *uci)
 {
 	collect_cpu_info_early(uci);
 	scan_microcode(initrd_start_early, initrd_end_early, mc_saved_data,
 		       mc_saved_in_initrd, uci);
 	load_microcode(mc_saved_data, mc_saved_in_initrd,
 		       initrd_start_early, uci);
 	apply_microcode_early(mc_saved_data, uci);
 }

 void __init
 load_ucode_intel_bsp(void)
 {
 	u64 ramdisk_image, ramdisk_size;
 	unsigned long initrd_start_early, initrd_end_early;
 	struct ucode_cpu_info uci;
 #ifdef CONFIG_X86_32
 	struct boot_params *boot_params_p;

 	boot_params_p = (struct boot_params *)__pa_nodebug(&boot_params);
 	ramdisk_image = boot_params_p->hdr.ramdisk_image;
 	ramdisk_size  = boot_params_p->hdr.ramdisk_size;
 	initrd_start_early = ramdisk_image;
 	initrd_end_early = initrd_start_early + ramdisk_size;

 	_load_ucode_intel_bsp(
 		(struct mc_saved_data *)__pa_nodebug(&mc_saved_data),
 		(unsigned long *)__pa_nodebug(&mc_saved_in_initrd),
 		initrd_start_early, initrd_end_early, &uci);
 #else
 	ramdisk_image = boot_params.hdr.ramdisk_image;
 	ramdisk_size  = boot_params.hdr.ramdisk_size;
 	initrd_start_early = ramdisk_image + PAGE_OFFSET;
 	initrd_end_early = initrd_start_early + ramdisk_size;

 	_load_ucode_intel_bsp(&mc_saved_data, mc_saved_in_initrd,
 			      initrd_start_early, initrd_end_early, &uci);
 #endif
 }

 void __cpuinit load_ucode_intel_ap(void)
 {
 	struct mc_saved_data *mc_saved_data_p;
 	struct ucode_cpu_info uci;
 	unsigned long *mc_saved_in_initrd_p;
 	unsigned long initrd_start_addr;
 #ifdef CONFIG_X86_32
 	unsigned long *initrd_start_p;

 	mc_saved_in_initrd_p =
 		(unsigned long *)__pa_nodebug(mc_saved_in_initrd);
 	mc_saved_data_p = (struct mc_saved_data *)__pa_nodebug(&mc_saved_data);
 	initrd_start_p = (unsigned long *)__pa_nodebug(&initrd_start);
 	initrd_start_addr = (unsigned long)__pa_nodebug(*initrd_start_p);
 #else
 	mc_saved_data_p = &mc_saved_data;
 	mc_saved_in_initrd_p = mc_saved_in_initrd;
 	initrd_start_addr = initrd_start;
 #endif

 	/*
 	 * If there is no valid ucode previously saved in memory, no need to
 	 * update ucode on this AP.
 	 */
 	if (mc_saved_data_p->mc_saved_count == 0)
 		return;

 	collect_cpu_info_early(&uci);
 	load_microcode(mc_saved_data_p, mc_saved_in_initrd_p,
 		       initrd_start_addr, &uci);
 	apply_microcode_early(mc_saved_data_p, &uci);
 }
	/*
	* Intel CPU microcode early update for Linux
	*
	* Copyright (C) 2012 Fenghua Yu <fenghua.yu@intel.com>
	* H Peter Anvin" <hpa@zytor.com>
	*
	* This allows to early upgrade microcode on Intel processors
	* belonging to IA-32 family - PentiumPro, Pentium II,
	* Pentium III, Xeon, Pentium 4, etc.
	*
	* Reference: Section 9.11 of Volume 3, IA-32 Intel Architecture
	* Software Developer's Manual.
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* as published by the Free Software Foundation; either version
	* 2 of the License, or (at your option) any later version.
	*/
	#include <linux/module.h>
	#include <linux/mm.h>
	#include <linux/slab.h>
	#include <linux/earlycpio.h>
	#include <linux/initrd.h>
	#include <linux/cpu.h>
	#include <asm/msr.h>
	#include <asm/microcode_intel.h>
	#include <asm/processor.h>
	#include <asm/tlbflush.h>
	#include <asm/setup.h>

	unsigned long mc_saved_in_initrd[MAX_UCODE_COUNT];
	struct mc_saved_data {
	unsigned int mc_saved_count;
	struct microcode_intel **mc_saved;
	} mc_saved_data;

	static enum ucode_state __cpuinit
	generic_load_microcode_early(struct microcode_intel **mc_saved_p,
	unsigned int mc_saved_count,
	struct ucode_cpu_info *uci)
	{
	struct microcode_intel ucode_ptr, new_mc = NULL;
	int new_rev = uci->cpu_sig.rev;
	enum ucode_state state = UCODE_OK;
	unsigned int mc_size;
	struct microcode_header_intel *mc_header;
	unsigned int csig = uci->cpu_sig.sig;
	unsigned int cpf = uci->cpu_sig.pf;
	int i;

	for (i = 0; i < mc_saved_count; i++) {
	ucode_ptr = mc_saved_p[i];

	mc_header = (struct microcode_header_intel *)ucode_ptr;
	mc_size = get_totalsize(mc_header);
	if (get_matching_microcode(csig, cpf, ucode_ptr, new_rev)) {
	new_rev = mc_header->rev;
	new_mc = ucode_ptr;
	}
	}

	if (!new_mc) {
	state = UCODE_NFOUND;
	goto out;
	}

	uci->mc = (struct microcode_intel *)new_mc;
	out:
	return state;
	}

	static void __cpuinit
	microcode_pointer(struct microcode_intel **mc_saved,
	unsigned long *mc_saved_in_initrd,
	unsigned long initrd_start, int mc_saved_count)
	{
	int i;

	for (i = 0; i < mc_saved_count; i++)
	mc_saved[i] = (struct microcode_intel *)
	(mc_saved_in_initrd[i] + initrd_start);
	}

	#ifdef CONFIG_X86_32
	static void __cpuinit
	microcode_phys(struct microcode_intel **mc_saved_tmp,
	struct mc_saved_data *mc_saved_data)
	{
	int i;
	struct microcode_intel ***mc_saved;

	mc_saved = (struct microcode_intel ***)
	__pa_nodebug(&mc_saved_data->mc_saved);
	for (i = 0; i < mc_saved_data->mc_saved_count; i++) {
	struct microcode_intel *p;

	p = (struct microcode_intel *)
	__pa_nodebug(mc_saved_data->mc_saved + i);
	mc_saved_tmp[i] = (struct microcode_intel *)__pa_nodebug(p);
	}
	}
	#endif

	static enum ucode_state __cpuinit
	load_microcode(struct mc_saved_data *mc_saved_data,
	unsigned long *mc_saved_in_initrd,
	unsigned long initrd_start,
	struct ucode_cpu_info *uci)
	{
	struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
	unsigned int count = mc_saved_data->mc_saved_count;

	if (!mc_saved_data->mc_saved) {
	microcode_pointer(mc_saved_tmp, mc_saved_in_initrd,
	initrd_start, count);

	return generic_load_microcode_early(mc_saved_tmp, count, uci);
	} else {
	#ifdef CONFIG_X86_32
	microcode_phys(mc_saved_tmp, mc_saved_data);
	return generic_load_microcode_early(mc_saved_tmp, count, uci);
	#else
	return generic_load_microcode_early(mc_saved_data->mc_saved,
	count, uci);
	#endif
	}
	}

	static u8 get_x86_family(unsigned long sig)
	{
	u8 x86;

	x86 = (sig >> 8) & 0xf;

	if (x86 == 0xf)
	x86 += (sig >> 20) & 0xff;

	return x86;
	}

	static u8 get_x86_model(unsigned long sig)
	{
	u8 x86, x86_model;

	x86 = get_x86_family(sig);
	x86_model = (sig >> 4) & 0xf;

	if (x86 == 0x6 \|\| x86 == 0xf)
	x86_model += ((sig >> 16) & 0xf) << 4;

	return x86_model;
	}

	/*
	* Given CPU signature and a microcode patch, this function finds if the
	* microcode patch has matching family and model with the CPU.
	*/
	static enum ucode_state
	matching_model_microcode(struct microcode_header_intel *mc_header,
	unsigned long sig)
	{
	u8 x86, x86_model;
	u8 x86_ucode, x86_model_ucode;
	struct extended_sigtable *ext_header;
	unsigned long total_size = get_totalsize(mc_header);
	unsigned long data_size = get_datasize(mc_header);
	int ext_sigcount, i;
	struct extended_signature *ext_sig;

	x86 = get_x86_family(sig);
	x86_model = get_x86_model(sig);

	x86_ucode = get_x86_family(mc_header->sig);
	x86_model_ucode = get_x86_model(mc_header->sig);

	if (x86 == x86_ucode && x86_model == x86_model_ucode)
	return UCODE_OK;

	/* Look for ext. headers: */
	if (total_size <= data_size + MC_HEADER_SIZE)
	return UCODE_NFOUND;

	ext_header = (struct extended_sigtable *)
	mc_header + data_size + MC_HEADER_SIZE;
	ext_sigcount = ext_header->count;
	ext_sig = (void *)ext_header + EXT_HEADER_SIZE;

	for (i = 0; i < ext_sigcount; i++) {
	x86_ucode = get_x86_family(ext_sig->sig);
	x86_model_ucode = get_x86_model(ext_sig->sig);

	if (x86 == x86_ucode && x86_model == x86_model_ucode)
	return UCODE_OK;

	ext_sig++;
	}

	return UCODE_NFOUND;
	}

	static int
	save_microcode(struct mc_saved_data *mc_saved_data,
	struct microcode_intel **mc_saved_src,
	unsigned int mc_saved_count)
	{
	int i, j;
	struct microcode_intel **mc_saved_p;
	int ret;

	if (!mc_saved_count)
	return -EINVAL;

	/*
	* Copy new microcode data.
	*/
	mc_saved_p = kmalloc(mc_saved_countsizeof(struct microcode_intel ),
	GFP_KERNEL);
	if (!mc_saved_p)
	return -ENOMEM;

	for (i = 0; i < mc_saved_count; i++) {
	struct microcode_intel *mc = mc_saved_src[i];
	struct microcode_header_intel *mc_header = &mc->hdr;
	unsigned long mc_size = get_totalsize(mc_header);
	mc_saved_p[i] = kmalloc(mc_size, GFP_KERNEL);
	if (!mc_saved_p[i]) {
	ret = -ENOMEM;
	goto err;
	}
	if (!mc_saved_src[i]) {
	ret = -EINVAL;
	goto err;
	}
	memcpy(mc_saved_p[i], mc, mc_size);
	}

	/*
	* Point to newly saved microcode.
	*/
	mc_saved_data->mc_saved = mc_saved_p;
	mc_saved_data->mc_saved_count = mc_saved_count;

	return 0;

	err:
	for (j = 0; j <= i; j++)
	kfree(mc_saved_p[j]);
	kfree(mc_saved_p);

	return ret;
	}

	/*
	* A microcode patch in ucode_ptr is saved into mc_saved
	* - if it has matching signature and newer revision compared to an existing
	* patch mc_saved.
	* - or if it is a newly discovered microcode patch.
	*
	* The microcode patch should have matching model with CPU.
	*/
	static void _save_mc(struct microcode_intel *mc_saved, u8 ucode_ptr,
	unsigned int *mc_saved_count_p)
	{
	int i;
	int found = 0;
	unsigned int mc_saved_count = *mc_saved_count_p;
	struct microcode_header_intel *mc_header;

	mc_header = (struct microcode_header_intel *)ucode_ptr;
	for (i = 0; i < mc_saved_count; i++) {
	unsigned int sig, pf;
	unsigned int new_rev;
	struct microcode_header_intel *mc_saved_header =
	(struct microcode_header_intel *)mc_saved[i];
	sig = mc_saved_header->sig;
	pf = mc_saved_header->pf;
	new_rev = mc_header->rev;

	if (get_matching_sig(sig, pf, ucode_ptr, new_rev)) {
	found = 1;
	if (update_match_revision(mc_header, new_rev)) {
	/*
	* Found an older ucode saved before.
	* Replace the older one with this newer
	* one.
	*/
	mc_saved[i] =
	(struct microcode_intel *)ucode_ptr;
	break;
	}
	}
	}
	if (i >= mc_saved_count && !found)
	/*
	* This ucode is first time discovered in ucode file.
	* Save it to memory.
	*/
	mc_saved[mc_saved_count++] =
	(struct microcode_intel *)ucode_ptr;

	*mc_saved_count_p = mc_saved_count;
	}

	/*
	* Get microcode matching with BSP's model. Only CPUs with the same model as
	* BSP can stay in the platform.
	*/
	static enum ucode_state __init
	get_matching_model_microcode(int cpu, unsigned long start,
	void *data, size_t size,
	struct mc_saved_data *mc_saved_data,
	unsigned long *mc_saved_in_initrd,
	struct ucode_cpu_info *uci)
	{
	u8 *ucode_ptr = data;
	unsigned int leftover = size;
	enum ucode_state state = UCODE_OK;
	unsigned int mc_size;
	struct microcode_header_intel *mc_header;
	struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
	unsigned int mc_saved_count = mc_saved_data->mc_saved_count;
	int i;

	while (leftover) {
	mc_header = (struct microcode_header_intel *)ucode_ptr;

	mc_size = get_totalsize(mc_header);
	if (!mc_size \|\| mc_size > leftover \|\|
	microcode_sanity_check(ucode_ptr, 0) < 0)
	break;

	leftover -= mc_size;

	/*
	* Since APs with same family and model as the BSP may boot in
	* the platform, we need to find and save microcode patches
	* with the same family and model as the BSP.
	*/
	if (matching_model_microcode(mc_header, uci->cpu_sig.sig) !=
	UCODE_OK) {
	ucode_ptr += mc_size;
	continue;
	}

	_save_mc(mc_saved_tmp, ucode_ptr, &mc_saved_count);

	ucode_ptr += mc_size;
	}

	if (leftover) {
	state = UCODE_ERROR;
	goto out;
	}

	if (mc_saved_count == 0) {
	state = UCODE_NFOUND;
	goto out;
	}

	for (i = 0; i < mc_saved_count; i++)
	mc_saved_in_initrd[i] = (unsigned long)mc_saved_tmp[i] - start;

	mc_saved_data->mc_saved_count = mc_saved_count;
	out:
	return state;
	}

	#define native_rdmsr(msr, val1, val2) \
	do { \
	u64 __val = native_read_msr((msr)); \
	(void)((val1) = (u32)__val); \
	(void)((val2) = (u32)(__val >> 32)); \
	} while (0)

	#define native_wrmsr(msr, low, high) \
	native_write_msr(msr, low, high);

	static int __cpuinit collect_cpu_info_early(struct ucode_cpu_info *uci)
	{
	unsigned int val[2];
	u8 x86, x86_model;
	struct cpu_signature csig;
	unsigned int eax, ebx, ecx, edx;

	csig.sig = 0;
	csig.pf = 0;
	csig.rev = 0;

	memset(uci, 0, sizeof(*uci));

	eax = 0x00000001;
	ecx = 0;
	native_cpuid(&eax, &ebx, &ecx, &edx);
	csig.sig = eax;

	x86 = get_x86_family(csig.sig);
	x86_model = get_x86_model(csig.sig);

	if ((x86_model >= 5) \|\| (x86 > 6)) {
	/* get processor flags from MSR 0x17 */
	native_rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
	csig.pf = 1 << ((val[1] >> 18) & 7);
	}
	native_wrmsr(MSR_IA32_UCODE_REV, 0, 0);

	/* As documented in the SDM: Do a CPUID 1 here */
	sync_core();

	/* get the current revision from MSR 0x8B */
	native_rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);

	csig.rev = val[1];

	uci->cpu_sig = csig;
	uci->valid = 1;

	return 0;
	}

	#ifdef DEBUG
	static void __ref show_saved_mc(void)
	{
	int i, j;
	unsigned int sig, pf, rev, total_size, data_size, date;
	struct ucode_cpu_info uci;

	if (mc_saved_data.mc_saved_count == 0) {
	pr_debug("no micorcode data saved.\n");
	return;
	}
	pr_debug("Total microcode saved: %d\n", mc_saved_data.mc_saved_count);

	collect_cpu_info_early(&uci);

	sig = uci.cpu_sig.sig;
	pf = uci.cpu_sig.pf;
	rev = uci.cpu_sig.rev;
	pr_debug("CPU%d: sig=0x%x, pf=0x%x, rev=0x%x\n",
	smp_processor_id(), sig, pf, rev);

	for (i = 0; i < mc_saved_data.mc_saved_count; i++) {
	struct microcode_header_intel *mc_saved_header;
	struct extended_sigtable *ext_header;
	int ext_sigcount;
	struct extended_signature *ext_sig;

	mc_saved_header = (struct microcode_header_intel *)
	mc_saved_data.mc_saved[i];
	sig = mc_saved_header->sig;
	pf = mc_saved_header->pf;
	rev = mc_saved_header->rev;
	total_size = get_totalsize(mc_saved_header);
	data_size = get_datasize(mc_saved_header);
	date = mc_saved_header->date;

	pr_debug("mc_saved[%d]: sig=0x%x, pf=0x%x, rev=0x%x, toal size=0x%x, date = %04x-%02x-%02x\n",
	i, sig, pf, rev, total_size,
	date & 0xffff,
	date >> 24,
	(date >> 16) & 0xff);

	/* Look for ext. headers: */
	if (total_size <= data_size + MC_HEADER_SIZE)
	continue;

	ext_header = (struct extended_sigtable *)
	mc_saved_header + data_size + MC_HEADER_SIZE;
	ext_sigcount = ext_header->count;
	ext_sig = (void *)ext_header + EXT_HEADER_SIZE;

	for (j = 0; j < ext_sigcount; j++) {
	sig = ext_sig->sig;
	pf = ext_sig->pf;

	pr_debug("\tExtended[%d]: sig=0x%x, pf=0x%x\n",
	j, sig, pf);

	ext_sig++;
	}

	}
	}
	#else
	static inline void show_saved_mc(void)
	{
	}
	#endif

	#if defined(CONFIG_MICROCODE_INTEL_EARLY) && defined(CONFIG_HOTPLUG_CPU)
	static DEFINE_MUTEX(x86_cpu_microcode_mutex);
	/*
	* Save this mc into mc_saved_data. So it will be loaded early when a CPU is
	* hot added or resumes.
	*
	* Please make sure this mc should be a valid microcode patch before calling
	* this function.
	*/
	int save_mc_for_early(u8 *mc)
	{
	struct microcode_intel *mc_saved_tmp[MAX_UCODE_COUNT];
	unsigned int mc_saved_count_init;
	unsigned int mc_saved_count;
	struct microcode_intel **mc_saved;
	int ret = 0;
	int i;

	/*
	* Hold hotplug lock so mc_saved_data is not accessed by a CPU in
	* hotplug.
	*/
	mutex_lock(&x86_cpu_microcode_mutex);

	mc_saved_count_init = mc_saved_data.mc_saved_count;
	mc_saved_count = mc_saved_data.mc_saved_count;
	mc_saved = mc_saved_data.mc_saved;

	if (mc_saved && mc_saved_count)
	memcpy(mc_saved_tmp, mc_saved,
	mc_saved_count * sizeof(struct mirocode_intel *));
	/*
	* Save the microcode patch mc in mc_save_tmp structure if it's a newer
	* version.
	*/

	_save_mc(mc_saved_tmp, mc, &mc_saved_count);

	/*
	* Save the mc_save_tmp in global mc_saved_data.
	*/
	ret = save_microcode(&mc_saved_data, mc_saved_tmp, mc_saved_count);
	if (ret) {
	pr_err("Cannot save microcode patch.\n");
	goto out;
	}

	show_saved_mc();

	/*
	* Free old saved microcod data.
	*/
	if (mc_saved) {
	for (i = 0; i < mc_saved_count_init; i++)
	kfree(mc_saved[i]);
	kfree(mc_saved);
	}

	out:
	mutex_unlock(&x86_cpu_microcode_mutex);

	return ret;
	}
	EXPORT_SYMBOL_GPL(save_mc_for_early);
	#endif

	static __initdata char ucode_name[] = "kernel/x86/microcode/GenuineIntel.bin";
	static __init enum ucode_state
	scan_microcode(unsigned long start, unsigned long end,
	struct mc_saved_data *mc_saved_data,
	unsigned long *mc_saved_in_initrd,
	struct ucode_cpu_info *uci)
	{
	unsigned int size = end - start + 1;
	struct cpio_data cd;
	long offset = 0;
	#ifdef CONFIG_X86_32
	char p = (char )__pa_nodebug(ucode_name);
	#else
	char *p = ucode_name;
	#endif

	cd.data = NULL;
	cd.size = 0;

	cd = find_cpio_data(p, (void *)start, size, &offset);
	if (!cd.data)
	return UCODE_ERROR;


	return get_matching_model_microcode(0, start, cd.data, cd.size,
	mc_saved_data, mc_saved_in_initrd,
	uci);
	}

	/*
	* Print ucode update info.
	*/
	static void __cpuinit
	print_ucode_info(struct ucode_cpu_info *uci, unsigned int date)
	{
	int cpu = smp_processor_id();

	pr_info("CPU%d microcode updated early to revision 0x%x, date = %04x-%02x-%02x\n",
	cpu,
	uci->cpu_sig.rev,
	date & 0xffff,
	date >> 24,
	(date >> 16) & 0xff);
	}

	#ifdef CONFIG_X86_32

	static int delay_ucode_info;
	static int current_mc_date;

	/*
	* Print early updated ucode info after printk works. This is delayed info dump.
	*/
	void __cpuinit show_ucode_info_early(void)
	{
	struct ucode_cpu_info uci;

	if (delay_ucode_info) {
	collect_cpu_info_early(&uci);
	print_ucode_info(&uci, current_mc_date);
	delay_ucode_info = 0;
	}
	}

	/*
	* At this point, we can not call printk() yet. Keep microcode patch number in
	* mc_saved_data.mc_saved and delay printing microcode info in
	* show_ucode_info_early() until printk() works.
	*/
	static void __cpuinit print_ucode(struct ucode_cpu_info *uci)
	{
	struct microcode_intel *mc_intel;
	int *delay_ucode_info_p;
	int *current_mc_date_p;

	mc_intel = uci->mc;
	if (mc_intel == NULL)
	return;

	delay_ucode_info_p = (int *)__pa_nodebug(&delay_ucode_info);
	current_mc_date_p = (int *)__pa_nodebug(&current_mc_date);

	*delay_ucode_info_p = 1;
	*current_mc_date_p = mc_intel->hdr.date;
	}
	#else

	/*
	* Flush global tlb. We only do this in x86_64 where paging has been enabled
	* already and PGE should be enabled as well.
	*/
	static inline void __cpuinit flush_tlb_early(void)
	{
	__native_flush_tlb_global_irq_disabled();
	}

	static inline void __cpuinit print_ucode(struct ucode_cpu_info *uci)
	{
	struct microcode_intel *mc_intel;

	mc_intel = uci->mc;
	if (mc_intel == NULL)
	return;

	print_ucode_info(uci, mc_intel->hdr.date);
	}
	#endif

	static int __cpuinit apply_microcode_early(struct mc_saved_data *mc_saved_data,
	struct ucode_cpu_info *uci)
	{
	struct microcode_intel *mc_intel;
	unsigned int val[2];

	mc_intel = uci->mc;
	if (mc_intel == NULL)
	return 0;

	/* write microcode via MSR 0x79 */
	native_wrmsr(MSR_IA32_UCODE_WRITE,
	(unsigned long) mc_intel->bits,
	(unsigned long) mc_intel->bits >> 16 >> 16);
	native_wrmsr(MSR_IA32_UCODE_REV, 0, 0);

	/* As documented in the SDM: Do a CPUID 1 here */
	sync_core();

	/* get the current revision from MSR 0x8B */
	native_rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
	if (val[1] != mc_intel->hdr.rev)
	return -1;

	#ifdef CONFIG_X86_64
	/* Flush global tlb. This is precaution. */
	flush_tlb_early();
	#endif
	uci->cpu_sig.rev = val[1];

	print_ucode(uci);

	return 0;
	}

	/*
	* This function converts microcode patch offsets previously stored in
	* mc_saved_in_initrd to pointers and stores the pointers in mc_saved_data.
	*/
	int __init save_microcode_in_initrd_intel(void)
	{
	unsigned int count = mc_saved_data.mc_saved_count;
	struct microcode_intel *mc_saved[MAX_UCODE_COUNT];
	int ret = 0;

	if (count == 0)
	return ret;

	microcode_pointer(mc_saved, mc_saved_in_initrd, initrd_start, count);
	ret = save_microcode(&mc_saved_data, mc_saved, count);
	if (ret)
	pr_err("Cannot save microcode patches from initrd.\n");

	show_saved_mc();

	return ret;
	}

	static void __init
	_load_ucode_intel_bsp(struct mc_saved_data *mc_saved_data,
	unsigned long *mc_saved_in_initrd,
	unsigned long initrd_start_early,
	unsigned long initrd_end_early,
	struct ucode_cpu_info *uci)
	{
	collect_cpu_info_early(uci);
	scan_microcode(initrd_start_early, initrd_end_early, mc_saved_data,
	mc_saved_in_initrd, uci);
	load_microcode(mc_saved_data, mc_saved_in_initrd,
	initrd_start_early, uci);
	apply_microcode_early(mc_saved_data, uci);
	}

	void __init
	load_ucode_intel_bsp(void)
	{
	u64 ramdisk_image, ramdisk_size;
	unsigned long initrd_start_early, initrd_end_early;
	struct ucode_cpu_info uci;
	#ifdef CONFIG_X86_32
	struct boot_params *boot_params_p;

	boot_params_p = (struct boot_params *)__pa_nodebug(&boot_params);
	ramdisk_image = boot_params_p->hdr.ramdisk_image;
	ramdisk_size = boot_params_p->hdr.ramdisk_size;
	initrd_start_early = ramdisk_image;
	initrd_end_early = initrd_start_early + ramdisk_size;

	_load_ucode_intel_bsp(
	(struct mc_saved_data *)__pa_nodebug(&mc_saved_data),
	(unsigned long *)__pa_nodebug(&mc_saved_in_initrd),
	initrd_start_early, initrd_end_early, &uci);
	#else
	ramdisk_image = boot_params.hdr.ramdisk_image;
	ramdisk_size = boot_params.hdr.ramdisk_size;
	initrd_start_early = ramdisk_image + PAGE_OFFSET;
	initrd_end_early = initrd_start_early + ramdisk_size;

	_load_ucode_intel_bsp(&mc_saved_data, mc_saved_in_initrd,
	initrd_start_early, initrd_end_early, &uci);
	#endif
	}

	void __cpuinit load_ucode_intel_ap(void)
	{
	struct mc_saved_data *mc_saved_data_p;
	struct ucode_cpu_info uci;
	unsigned long *mc_saved_in_initrd_p;
	unsigned long initrd_start_addr;
	#ifdef CONFIG_X86_32
	unsigned long *initrd_start_p;

	mc_saved_in_initrd_p =
	(unsigned long *)__pa_nodebug(mc_saved_in_initrd);
	mc_saved_data_p = (struct mc_saved_data *)__pa_nodebug(&mc_saved_data);
	initrd_start_p = (unsigned long *)__pa_nodebug(&initrd_start);
	initrd_start_addr = (unsigned long)__pa_nodebug(*initrd_start_p);
	#else
	mc_saved_data_p = &mc_saved_data;
	mc_saved_in_initrd_p = mc_saved_in_initrd;
	initrd_start_addr = initrd_start;
	#endif

	/*
	* If there is no valid ucode previously saved in memory, no need to
	* update ucode on this AP.
	*/
	if (mc_saved_data_p->mc_saved_count == 0)
	return;

	collect_cpu_info_early(&uci);
	load_microcode(mc_saved_data_p, mc_saved_in_initrd_p,
	initrd_start_addr, &uci);
	apply_microcode_early(mc_saved_data_p, &uci);
	}