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    Subject[PATCH v5 08/12] x86/microcode_intel_early.c: Early update ucode on Intel's CPU
    Date
    From: Fenghua Yu <fenghua.yu@intel.com>

    Implementation of early update ucode on Intel's CPU.

    load_ucode_intel_bsp() scans ucode in initrd image file which is a cpio format
    ucode followed by ordinary initrd image file. The binary ucode file is stored
    in kernel/x86/microcode/GenuineIntel.bin in the cpio data. All ucode
    patches with the same model as BSP are saved in memory. A matching ucode patch
    is updated on BSP.

    load_ucode_intel_ap() reads saved ucoded patches and updates ucode on AP.

    Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
    ---
    arch/x86/kernel/microcode_intel_early.c | 796 ++++++++++++++++++++++++++++++++
    1 file changed, 796 insertions(+)
    create mode 100644 arch/x86/kernel/microcode_intel_early.c

    diff --git a/arch/x86/kernel/microcode_intel_early.c b/arch/x86/kernel/microcode_intel_early.c
    new file mode 100644
    index 0000000..7890bc8
    --- /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);
    +}
    --
    1.8.0.1


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