Merge branch 'x86/microcode' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 microcode loading update from Peter Anvin:
 "This patchset lets us update the CPU microcode very, very early in
  initialization if the BIOS fails to do so (never happens, right?)

  This is handy for dealing with things like the Atom erratum where we
  have to run without PSE because microcode loading happens too late.

  As I mentioned in the x86/mm push request it depends on that
  infrastructure but it is otherwise a standalone feature."

* 'x86/microcode' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/Kconfig: Make early microcode loading a configuration feature
  x86/mm/init.c: Copy ucode from initrd image to kernel memory
  x86/head64.c: Early update ucode in 64-bit
  x86/head_32.S: Early update ucode in 32-bit
  x86/microcode_intel_early.c: Early update ucode on Intel's CPU
  x86/tlbflush.h: Define __native_flush_tlb_global_irq_disabled()
  x86/microcode_intel_lib.c: Early update ucode on Intel's CPU
  x86/microcode_core_early.c: Define interfaces for early loading ucode
  x86/common.c: load ucode in 64 bit or show loading ucode info in 32 bit on AP
  x86/common.c: Make have_cpuid_p() a global function
  x86/microcode_intel.h: Define functions and macros for early loading ucode
  x86, doc: Documentation for early microcode loading

1 files changed, 796 insertions, 0 deletions

diff --git a/arch/x86/kernel/microcode_intel_early.c b/arch/x86/kernel/microcode_intel_early.c
new file mode 100644
index 00000000000..7890bc83895
--- /dev/null
+++ b/arch/x86/kernel/microcode_intel_early.c
@@ -0,0 +1,796 @@
+/*
+ *	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_symbol(&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(mc_saved_data->mc_saved + i);
+		mc_saved_tmp[i] = (struct microcode_intel *)__pa(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)
+/*
+ * 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.
+	 */
+	cpu_hotplug_driver_lock();
+
+	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("Can not 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:
+	cpu_hotplug_driver_unlock();
+
+	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_symbol(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_symbol(&delay_ucode_info);
+	current_mc_date_p = (int *)__pa_symbol(&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 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(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("Can not save microcod patches from initrd");
+
+	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_symbol(&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_symbol(&mc_saved_data),
+		(unsigned long *)__pa_symbol(&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_symbol(mc_saved_in_initrd);
+	mc_saved_data_p = (struct mc_saved_data *)__pa_symbol(&mc_saved_data);
+	initrd_start_p = (unsigned long *)__pa_symbol(&initrd_start);
+	initrd_start_addr = (unsigned long)__pa_symbol(*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);
+}