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diff --git a/arch/x86/kernel/microcode_core.c b/arch/x86/kernel/microcode_core.c
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+/*
+ * Intel CPU Microcode Update Driver for Linux
+ *
+ * Copyright (C) 2000-2006 Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
+ * 2006 Shaohua Li <shaohua.li@intel.com>
+ *
+ * This driver allows to upgrade microcode on Intel processors
+ * belonging to IA-32 family - PentiumPro, Pentium II,
+ * Pentium III, Xeon, Pentium 4, etc.
+ *
+ * Reference: Section 8.11 of Volume 3a, IA-32 Intel? Architecture
+ * Software Developer's Manual
+ * Order Number 253668 or free download from:
+ *
+ * http://developer.intel.com/design/pentium4/manuals/253668.htm
+ *
+ * For more information, go to http://www.urbanmyth.org/microcode
+ *
+ * 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.
+ *
+ * 1.0 16 Feb 2000, Tigran Aivazian <tigran@sco.com>
+ * Initial release.
+ * 1.01 18 Feb 2000, Tigran Aivazian <tigran@sco.com>
+ * Added read() support + cleanups.
+ * 1.02 21 Feb 2000, Tigran Aivazian <tigran@sco.com>
+ * Added 'device trimming' support. open(O_WRONLY) zeroes
+ * and frees the saved copy of applied microcode.
+ * 1.03 29 Feb 2000, Tigran Aivazian <tigran@sco.com>
+ * Made to use devfs (/dev/cpu/microcode) + cleanups.
+ * 1.04 06 Jun 2000, Simon Trimmer <simon@veritas.com>
+ * Added misc device support (now uses both devfs and misc).
+ * Added MICROCODE_IOCFREE ioctl to clear memory.
+ * 1.05 09 Jun 2000, Simon Trimmer <simon@veritas.com>
+ * Messages for error cases (non Intel & no suitable microcode).
+ * 1.06 03 Aug 2000, Tigran Aivazian <tigran@veritas.com>
+ * Removed ->release(). Removed exclusive open and status bitmap.
+ * Added microcode_rwsem to serialize read()/write()/ioctl().
+ * Removed global kernel lock usage.
+ * 1.07 07 Sep 2000, Tigran Aivazian <tigran@veritas.com>
+ * Write 0 to 0x8B msr and then cpuid before reading revision,
+ * so that it works even if there were no update done by the
+ * BIOS. Otherwise, reading from 0x8B gives junk (which happened
+ * to be 0 on my machine which is why it worked even when I
+ * disabled update by the BIOS)
+ * Thanks to Eric W. Biederman <ebiederman@lnxi.com> for the fix.
+ * 1.08 11 Dec 2000, Richard Schaal <richard.schaal@intel.com> and
+ * Tigran Aivazian <tigran@veritas.com>
+ * Intel Pentium 4 processor support and bugfixes.
+ * 1.09 30 Oct 2001, Tigran Aivazian <tigran@veritas.com>
+ * Bugfix for HT (Hyper-Threading) enabled processors
+ * whereby processor resources are shared by all logical processors
+ * in a single CPU package.
+ * 1.10 28 Feb 2002 Asit K Mallick <asit.k.mallick@intel.com> and
+ * Tigran Aivazian <tigran@veritas.com>,
+ * Serialize updates as required on HT processors due to
+ * speculative nature of implementation.
+ * 1.11 22 Mar 2002 Tigran Aivazian <tigran@veritas.com>
+ * Fix the panic when writing zero-length microcode chunk.
+ * 1.12 29 Sep 2003 Nitin Kamble <nitin.a.kamble@intel.com>,
+ * Jun Nakajima <jun.nakajima@intel.com>
+ * Support for the microcode updates in the new format.
+ * 1.13 10 Oct 2003 Tigran Aivazian <tigran@veritas.com>
+ * Removed ->read() method and obsoleted MICROCODE_IOCFREE ioctl
+ * because we no longer hold a copy of applied microcode
+ * in kernel memory.
+ * 1.14 25 Jun 2004 Tigran Aivazian <tigran@veritas.com>
+ * Fix sigmatch() macro to handle old CPUs with pf == 0.
+ * Thanks to Stuart Swales for pointing out this bug.
+ */
+#include <linux/capability.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/smp_lock.h>
+#include <linux/cpumask.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/miscdevice.h>
+#include <linux/spinlock.h>
+#include <linux/mm.h>
+#include <linux/fs.h>
+#include <linux/mutex.h>
+#include <linux/cpu.h>
+#include <linux/firmware.h>
+#include <linux/platform_device.h>
+
+#include <asm/msr.h>
+#include <asm/uaccess.h>
+#include <asm/processor.h>
+#include <asm/microcode.h>
+
+MODULE_DESCRIPTION("Microcode Update Driver");
+MODULE_AUTHOR("Tigran Aivazian <tigran@aivazian.fsnet.co.uk>");
+MODULE_LICENSE("GPL");
+
+#define MICROCODE_VERSION "2.00"
+
+struct microcode_ops *microcode_ops;
+
+/* no concurrent ->write()s are allowed on /dev/cpu/microcode */
+static DEFINE_MUTEX(microcode_mutex);
+
+struct ucode_cpu_info ucode_cpu_info[NR_CPUS];
+EXPORT_SYMBOL_GPL(ucode_cpu_info);
+
+#ifdef CONFIG_MICROCODE_OLD_INTERFACE
+static int do_microcode_update(const void __user *buf, size_t size)
+{
+ cpumask_t old;
+ int error = 0;
+ int cpu;
+
+ old = current->cpus_allowed;
+
+ for_each_online_cpu(cpu) {
+ struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
+
+ if (!uci->valid)
+ continue;
+
+ set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
+ error = microcode_ops->request_microcode_user(cpu, buf, size);
+ if (error < 0)
+ goto out;
+ if (!error)
+ microcode_ops->apply_microcode(cpu);
+ }
+out:
+ set_cpus_allowed_ptr(current, &old);
+ return error;
+}
+
+static int microcode_open(struct inode *unused1, struct file *unused2)
+{
+ cycle_kernel_lock();
+ return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
+}
+
+static ssize_t microcode_write(struct file *file, const char __user *buf,
+ size_t len, loff_t *ppos)
+{
+ ssize_t ret;
+
+ if ((len >> PAGE_SHIFT) > num_physpages) {
+ printk(KERN_ERR "microcode: too much data (max %ld pages)\n",
+ num_physpages);
+ return -EINVAL;
+ }
+
+ get_online_cpus();
+ mutex_lock(&microcode_mutex);
+
+ ret = do_microcode_update(buf, len);
+ if (!ret)
+ ret = (ssize_t)len;
+
+ mutex_unlock(&microcode_mutex);
+ put_online_cpus();
+
+ return ret;
+}
+
+static const struct file_operations microcode_fops = {
+ .owner = THIS_MODULE,
+ .write = microcode_write,
+ .open = microcode_open,
+};
+
+static struct miscdevice microcode_dev = {
+ .minor = MICROCODE_MINOR,
+ .name = "microcode",
+ .fops = &microcode_fops,
+};
+
+static int __init microcode_dev_init(void)
+{
+ int error;
+
+ error = misc_register(&microcode_dev);
+ if (error) {
+ printk(KERN_ERR
+ "microcode: can't misc_register on minor=%d\n",
+ MICROCODE_MINOR);
+ return error;
+ }
+
+ return 0;
+}
+
+static void microcode_dev_exit(void)
+{
+ misc_deregister(&microcode_dev);
+}
+
+MODULE_ALIAS_MISCDEV(MICROCODE_MINOR);
+#else
+#define microcode_dev_init() 0
+#define microcode_dev_exit() do { } while (0)
+#endif
+
+/* fake device for request_firmware */
+struct platform_device *microcode_pdev;
+
+static ssize_t reload_store(struct sys_device *dev,
+ struct sysdev_attribute *attr,
+ const char *buf, size_t sz)
+{
+ struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
+ char *end;
+ unsigned long val = simple_strtoul(buf, &end, 0);
+ int err = 0;
+ int cpu = dev->id;
+
+ if (end == buf)
+ return -EINVAL;
+ if (val == 1) {
+ cpumask_t old = current->cpus_allowed;
+
+ get_online_cpus();
+ if (cpu_online(cpu)) {
+ set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
+ mutex_lock(&microcode_mutex);
+ if (uci->valid) {
+ err = microcode_ops->request_microcode_fw(cpu,
+ &microcode_pdev->dev);
+ if (!err)
+ microcode_ops->apply_microcode(cpu);
+ }
+ mutex_unlock(&microcode_mutex);
+ set_cpus_allowed_ptr(current, &old);
+ }
+ put_online_cpus();
+ }
+ if (err)
+ return err;
+ return sz;
+}
+
+static ssize_t version_show(struct sys_device *dev,
+ struct sysdev_attribute *attr, char *buf)
+{
+ struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
+
+ return sprintf(buf, "0x%x\n", uci->cpu_sig.rev);
+}
+
+static ssize_t pf_show(struct sys_device *dev,
+ struct sysdev_attribute *attr, char *buf)
+{
+ struct ucode_cpu_info *uci = ucode_cpu_info + dev->id;
+
+ return sprintf(buf, "0x%x\n", uci->cpu_sig.pf);
+}
+
+static SYSDEV_ATTR(reload, 0200, NULL, reload_store);
+static SYSDEV_ATTR(version, 0400, version_show, NULL);
+static SYSDEV_ATTR(processor_flags, 0400, pf_show, NULL);
+
+static struct attribute *mc_default_attrs[] = {
+ &attr_reload.attr,
+ &attr_version.attr,
+ &attr_processor_flags.attr,
+ NULL
+};
+
+static struct attribute_group mc_attr_group = {
+ .attrs = mc_default_attrs,
+ .name = "microcode",
+};
+
+static void microcode_fini_cpu(int cpu)
+{
+ struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
+
+ mutex_lock(&microcode_mutex);
+ microcode_ops->microcode_fini_cpu(cpu);
+ uci->valid = 0;
+ mutex_unlock(&microcode_mutex);
+}
+
+static void collect_cpu_info(int cpu)
+{
+ struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
+
+ memset(uci, 0, sizeof(*uci));
+ if (!microcode_ops->collect_cpu_info(cpu, &uci->cpu_sig))
+ uci->valid = 1;
+}
+
+static int microcode_resume_cpu(int cpu)
+{
+ struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
+ struct cpu_signature nsig;
+
+ pr_debug("microcode: CPU%d resumed\n", cpu);
+
+ if (!uci->mc)
+ return 1;
+
+ /*
+ * Let's verify that the 'cached' ucode does belong
+ * to this cpu (a bit of paranoia):
+ */
+ if (microcode_ops->collect_cpu_info(cpu, &nsig)) {
+ microcode_fini_cpu(cpu);
+ return -1;
+ }
+
+ if (memcmp(&nsig, &uci->cpu_sig, sizeof(nsig))) {
+ microcode_fini_cpu(cpu);
+ /* Should we look for a new ucode here? */
+ return 1;
+ }
+
+ return 0;
+}
+
+void microcode_update_cpu(int cpu)
+{
+ struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
+ int err = 0;
+
+ /*
+ * Check if the system resume is in progress (uci->valid != NULL),
+ * otherwise just request a firmware:
+ */
+ if (uci->valid) {
+ err = microcode_resume_cpu(cpu);
+ } else {
+ collect_cpu_info(cpu);
+ if (uci->valid && system_state == SYSTEM_RUNNING)
+ err = microcode_ops->request_microcode_fw(cpu,
+ &microcode_pdev->dev);
+ }
+ if (!err)
+ microcode_ops->apply_microcode(cpu);
+}
+
+static void microcode_init_cpu(int cpu)
+{
+ cpumask_t old = current->cpus_allowed;
+
+ set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
+ /* We should bind the task to the CPU */
+ BUG_ON(raw_smp_processor_id() != cpu);
+
+ mutex_lock(&microcode_mutex);
+ microcode_update_cpu(cpu);
+ mutex_unlock(&microcode_mutex);
+
+ set_cpus_allowed_ptr(current, &old);
+}
+
+static int mc_sysdev_add(struct sys_device *sys_dev)
+{
+ int err, cpu = sys_dev->id;
+ struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
+
+ if (!cpu_online(cpu))
+ return 0;
+
+ pr_debug("microcode: CPU%d added\n", cpu);
+ memset(uci, 0, sizeof(*uci));
+
+ err = sysfs_create_group(&sys_dev->kobj, &mc_attr_group);
+ if (err)
+ return err;
+
+ microcode_init_cpu(cpu);
+ return 0;
+}
+
+static int mc_sysdev_remove(struct sys_device *sys_dev)
+{
+ int cpu = sys_dev->id;
+
+ if (!cpu_online(cpu))
+ return 0;
+
+ pr_debug("microcode: CPU%d removed\n", cpu);
+ microcode_fini_cpu(cpu);
+ sysfs_remove_group(&sys_dev->kobj, &mc_attr_group);
+ return 0;
+}
+
+static int mc_sysdev_resume(struct sys_device *dev)
+{
+ int cpu = dev->id;
+
+ if (!cpu_online(cpu))
+ return 0;
+
+ /* only CPU 0 will apply ucode here */
+ microcode_update_cpu(0);
+ return 0;
+}
+
+static struct sysdev_driver mc_sysdev_driver = {
+ .add = mc_sysdev_add,
+ .remove = mc_sysdev_remove,
+ .resume = mc_sysdev_resume,
+};
+
+static __cpuinit int
+mc_cpu_callback(struct notifier_block *nb, unsigned long action, void *hcpu)
+{
+ unsigned int cpu = (unsigned long)hcpu;
+ struct sys_device *sys_dev;
+
+ sys_dev = get_cpu_sysdev(cpu);
+ switch (action) {
+ case CPU_ONLINE:
+ case CPU_ONLINE_FROZEN:
+ microcode_init_cpu(cpu);
+ case CPU_DOWN_FAILED:
+ case CPU_DOWN_FAILED_FROZEN:
+ pr_debug("microcode: CPU%d added\n", cpu);
+ if (sysfs_create_group(&sys_dev->kobj, &mc_attr_group))
+ printk(KERN_ERR "microcode: Failed to create the sysfs "
+ "group for CPU%d\n", cpu);
+ break;
+ case CPU_DOWN_PREPARE:
+ case CPU_DOWN_PREPARE_FROZEN:
+ /* Suspend is in progress, only remove the interface */
+ sysfs_remove_group(&sys_dev->kobj, &mc_attr_group);
+ pr_debug("microcode: CPU%d removed\n", cpu);
+ break;
+ case CPU_DEAD:
+ case CPU_UP_CANCELED_FROZEN:
+ /* The CPU refused to come up during a system resume */
+ microcode_fini_cpu(cpu);
+ break;
+ }
+ return NOTIFY_OK;
+}
+
+static struct notifier_block __refdata mc_cpu_notifier = {
+ .notifier_call = mc_cpu_callback,
+};
+
+static int __init microcode_init(void)
+{
+ struct cpuinfo_x86 *c = &cpu_data(0);
+ int error;
+
+ if (c->x86_vendor == X86_VENDOR_INTEL)
+ microcode_ops = init_intel_microcode();
+ else if (c->x86_vendor == X86_VENDOR_AMD)
+ microcode_ops = init_amd_microcode();
+
+ if (!microcode_ops) {
+ printk(KERN_ERR "microcode: no support for this CPU vendor\n");
+ return -ENODEV;
+ }
+
+ error = microcode_dev_init();
+ if (error)
+ return error;
+ microcode_pdev = platform_device_register_simple("microcode", -1,
+ NULL, 0);
+ if (IS_ERR(microcode_pdev)) {
+ microcode_dev_exit();
+ return PTR_ERR(microcode_pdev);
+ }
+
+ get_online_cpus();
+ error = sysdev_driver_register(&cpu_sysdev_class, &mc_sysdev_driver);
+ put_online_cpus();
+ if (error) {
+ microcode_dev_exit();
+ platform_device_unregister(microcode_pdev);
+ return error;
+ }
+
+ register_hotcpu_notifier(&mc_cpu_notifier);
+
+ printk(KERN_INFO
+ "Microcode Update Driver: v" MICROCODE_VERSION
+ " <tigran@aivazian.fsnet.co.uk>"
+ " <peter.oruba@amd.com>\n");
+
+ return 0;
+}
+
+static void __exit microcode_exit(void)
+{
+ microcode_dev_exit();
+
+ unregister_hotcpu_notifier(&mc_cpu_notifier);
+
+ get_online_cpus();
+ sysdev_driver_unregister(&cpu_sysdev_class, &mc_sysdev_driver);
+ put_online_cpus();
+
+ platform_device_unregister(microcode_pdev);
+
+ microcode_ops = NULL;
+
+ printk(KERN_INFO
+ "Microcode Update Driver: v" MICROCODE_VERSION " removed.\n");
+}
+
+module_init(microcode_init);
+module_exit(microcode_exit);