arch/i386/kernel/microcode.c

   1 /*
   2  *      Intel CPU Microcode Update Driver for Linux
   3  *
   4  *      Copyright (C) 2000-2004 Tigran Aivazian
   5  *                    2006      Shaohua Li <shaohua.li@intel.com>
   6  *
   7  *      This driver allows to upgrade microcode on Intel processors
   8  *      belonging to IA-32 family - PentiumPro, Pentium II,
   9  *      Pentium III, Xeon, Pentium 4, etc.
  10  *
  11  *      Reference: Section 8.10 of Volume III, Intel Pentium 4 Manual,
  12  *      Order Number 245472 or free download from:
  13  *
  14  *      http://developer.intel.com/design/pentium4/manuals/245472.htm
  15  *
  16  *      For more information, go to http://www.urbanmyth.org/microcode
  17  *
  18  *      This program is free software; you can redistribute it and/or
  19  *      modify it under the terms of the GNU General Public License
  20  *      as published by the Free Software Foundation; either version
  21  *      2 of the License, or (at your option) any later version.
  22  *
  23  *      1.0     16 Feb 2000, Tigran Aivazian <tigran@sco.com>
  24  *              Initial release.
  25  *      1.01    18 Feb 2000, Tigran Aivazian <tigran@sco.com>
  26  *              Added read() support + cleanups.
  27  *      1.02    21 Feb 2000, Tigran Aivazian <tigran@sco.com>
  28  *              Added 'device trimming' support. open(O_WRONLY) zeroes
  29  *              and frees the saved copy of applied microcode.
  30  *      1.03    29 Feb 2000, Tigran Aivazian <tigran@sco.com>
  31  *              Made to use devfs (/dev/cpu/microcode) + cleanups.
  32  *      1.04    06 Jun 2000, Simon Trimmer <simon@veritas.com>
  33  *              Added misc device support (now uses both devfs and misc).
  34  *              Added MICROCODE_IOCFREE ioctl to clear memory.
  35  *      1.05    09 Jun 2000, Simon Trimmer <simon@veritas.com>
  36  *              Messages for error cases (non Intel & no suitable microcode).
  37  *      1.06    03 Aug 2000, Tigran Aivazian <tigran@veritas.com>
  38  *              Removed ->release(). Removed exclusive open and status bitmap.
  39  *              Added microcode_rwsem to serialize read()/write()/ioctl().
  40  *              Removed global kernel lock usage.
  41  *      1.07    07 Sep 2000, Tigran Aivazian <tigran@veritas.com>
  42  *              Write 0 to 0x8B msr and then cpuid before reading revision,
  43  *              so that it works even if there were no update done by the
  44  *              BIOS. Otherwise, reading from 0x8B gives junk (which happened
  45  *              to be 0 on my machine which is why it worked even when I
  46  *              disabled update by the BIOS)
  47  *              Thanks to Eric W. Biederman <ebiederman@lnxi.com> for the fix.
  48  *      1.08    11 Dec 2000, Richard Schaal <richard.schaal@intel.com> and
  49  *                           Tigran Aivazian <tigran@veritas.com>
  50  *              Intel Pentium 4 processor support and bugfixes.
  51  *      1.09    30 Oct 2001, Tigran Aivazian <tigran@veritas.com>
  52  *              Bugfix for HT (Hyper-Threading) enabled processors
  53  *              whereby processor resources are shared by all logical processors
  54  *              in a single CPU package.
  55  *      1.10    28 Feb 2002 Asit K Mallick <asit.k.mallick@intel.com> and
  56  *              Tigran Aivazian <tigran@veritas.com>,
  57  *              Serialize updates as required on HT processors due to speculative
  58  *              nature of implementation.
  59  *      1.11    22 Mar 2002 Tigran Aivazian <tigran@veritas.com>
  60  *              Fix the panic when writing zero-length microcode chunk.
  61  *      1.12    29 Sep 2003 Nitin Kamble <nitin.a.kamble@intel.com>,
  62  *              Jun Nakajima <jun.nakajima@intel.com>
  63  *              Support for the microcode updates in the new format.
  64  *      1.13    10 Oct 2003 Tigran Aivazian <tigran@veritas.com>
  65  *              Removed ->read() method and obsoleted MICROCODE_IOCFREE ioctl
  66  *              because we no longer hold a copy of applied microcode
  67  *              in kernel memory.
  68  *      1.14    25 Jun 2004 Tigran Aivazian <tigran@veritas.com>
  69  *              Fix sigmatch() macro to handle old CPUs with pf == 0.
  70  *              Thanks to Stuart Swales for pointing out this bug.
  71  */
  72
  73 //#define DEBUG /* pr_debug */
  74 #include <linux/capability.h>
  75 #include <linux/kernel.h>
  76 #include <linux/init.h>
  77 #include <linux/sched.h>
  78 #include <linux/cpumask.h>
  79 #include <linux/module.h>
  80 #include <linux/slab.h>
  81 #include <linux/vmalloc.h>
  82 #include <linux/miscdevice.h>
  83 #include <linux/spinlock.h>
  84 #include <linux/mm.h>
  85 #include <linux/mutex.h>
  86 #include <linux/cpu.h>
  87 #include <linux/firmware.h>
  88 #include <linux/platform_device.h>
  89
  90 #include <asm/msr.h>
  91 #include <asm/uaccess.h>
  92 #include <asm/processor.h>
  93
  94 MODULE_DESCRIPTION("Intel CPU (IA-32) Microcode Update Driver");
  95 MODULE_AUTHOR("Tigran Aivazian <tigran@veritas.com>");
  96 MODULE_LICENSE("GPL");
  97
  98 #define MICROCODE_VERSION       "1.14a"
  99
 100 #define DEFAULT_UCODE_DATASIZE  (2000)    /* 2000 bytes */
 101 #define MC_HEADER_SIZE          (sizeof (microcode_header_t))     /* 48 bytes */
 102 #define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE) /* 2048 bytes */
 103 #define EXT_HEADER_SIZE         (sizeof (struct extended_sigtable)) /* 20 bytes */
 104 #define EXT_SIGNATURE_SIZE      (sizeof (struct extended_signature)) /* 12 bytes */
 105 #define DWSIZE                  (sizeof (u32))
 106 #define get_totalsize(mc) \
 107         (((microcode_t *)mc)->hdr.totalsize ? \
 108          ((microcode_t *)mc)->hdr.totalsize : DEFAULT_UCODE_TOTALSIZE)
 109 #define get_datasize(mc) \
 110         (((microcode_t *)mc)->hdr.datasize ? \
 111          ((microcode_t *)mc)->hdr.datasize : DEFAULT_UCODE_DATASIZE)
 112
 113 #define sigmatch(s1, s2, p1, p2) \
 114         (((s1) == (s2)) && (((p1) & (p2)) || (((p1) == 0) && ((p2) == 0))))
 115
 116 #define exttable_size(et) ((et)->count * EXT_SIGNATURE_SIZE + EXT_HEADER_SIZE)
 117
 118 /* serialize access to the physical write to MSR 0x79 */
 119 static DEFINE_SPINLOCK(microcode_update_lock);
 120
 121 /* no concurrent ->write()s are allowed on /dev/cpu/microcode */
 122 static DEFINE_MUTEX(microcode_mutex);
 123
 124 static struct ucode_cpu_info {
 125         int valid;
 126         unsigned int sig;
 127         unsigned int pf;
 128         unsigned int rev;
 129         microcode_t *mc;
 130 } ucode_cpu_info[NR_CPUS];
 131
 132 static void collect_cpu_info(int cpu_num)
 133 {
 134         struct cpuinfo_x86 *c = cpu_data + cpu_num;
 135         struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
 136         unsigned int val[2];
 137
 138         /* We should bind the task to the CPU */
 139         BUG_ON(raw_smp_processor_id() != cpu_num);
 140         uci->pf = uci->rev = 0;
 141         uci->mc = NULL;
 142         uci->valid = 1;
 143
 144         if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 ||
 145                 cpu_has(c, X86_FEATURE_IA64)) {
 146                 printk(KERN_ERR "microcode: CPU%d not a capable Intel "
 147                         "processor\n", cpu_num);
 148                 uci->valid = 0;
 149                 return;
 150         }
 151
 152         uci->sig = cpuid_eax(0x00000001);
 153
 154         if ((c->x86_model >= 5) || (c->x86 > 6)) {
 155                 /* get processor flags from MSR 0x17 */
 156                 rdmsr(MSR_IA32_PLATFORM_ID, val[0], val[1]);
 157                 uci->pf = 1 << ((val[1] >> 18) & 7);
 158         }
 159
 160         wrmsr(MSR_IA32_UCODE_REV, 0, 0);
 161         /* see notes above for revision 1.07.  Apparent chip bug */
 162         sync_core();
 163         /* get the current revision from MSR 0x8B */
 164         rdmsr(MSR_IA32_UCODE_REV, val[0], uci->rev);
 165         pr_debug("microcode: collect_cpu_info : sig=0x%x, pf=0x%x, rev=0x%x\n",
 166                         uci->sig, uci->pf, uci->rev);
 167 }
 168
 169 static inline int microcode_update_match(int cpu_num,
 170         microcode_header_t *mc_header, int sig, int pf)
 171 {
 172         struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
 173
 174         if (!sigmatch(sig, uci->sig, pf, uci->pf)
 175                 || mc_header->rev <= uci->rev)
 176                 return 0;
 177         return 1;
 178 }
 179
 180 static int microcode_sanity_check(void *mc)
 181 {
 182         microcode_header_t *mc_header = mc;
 183         struct extended_sigtable *ext_header = NULL;
 184         struct extended_signature *ext_sig;
 185         unsigned long total_size, data_size, ext_table_size;
 186         int sum, orig_sum, ext_sigcount = 0, i;
 187
 188         total_size = get_totalsize(mc_header);
 189         data_size = get_datasize(mc_header);
 190         if ((data_size + MC_HEADER_SIZE > total_size)
 191                 || (data_size < DEFAULT_UCODE_DATASIZE)) {
 192                 printk(KERN_ERR "microcode: error! "
 193                         "Bad data size in microcode data file\n");
 194                 return -EINVAL;
 195         }
 196
 197         if (mc_header->ldrver != 1 || mc_header->hdrver != 1) {
 198                 printk(KERN_ERR "microcode: error! "
 199                         "Unknown microcode update format\n");
 200                 return -EINVAL;
 201         }
 202         ext_table_size = total_size - (MC_HEADER_SIZE + data_size);
 203         if (ext_table_size) {
 204                 if ((ext_table_size < EXT_HEADER_SIZE)
 205                  || ((ext_table_size - EXT_HEADER_SIZE) % EXT_SIGNATURE_SIZE)) {
 206                         printk(KERN_ERR "microcode: error! "
 207                                 "Small exttable size in microcode data file\n");
 208                         return -EINVAL;
 209                 }
 210                 ext_header = mc + MC_HEADER_SIZE + data_size;
 211                 if (ext_table_size != exttable_size(ext_header)) {
 212                         printk(KERN_ERR "microcode: error! "
 213                                 "Bad exttable size in microcode data file\n");
 214                         return -EFAULT;
 215                 }
 216                 ext_sigcount = ext_header->count;
 217         }
 218
 219         /* check extended table checksum */
 220         if (ext_table_size) {
 221                 int ext_table_sum = 0;
 222                 int * ext_tablep = (int *)ext_header;
 223
 224                 i = ext_table_size / DWSIZE;
 225                 while (i--)
 226                         ext_table_sum += ext_tablep[i];
 227                 if (ext_table_sum) {
 228                         printk(KERN_WARNING "microcode: aborting, "
 229                                 "bad extended signature table checksum\n");
 230                         return -EINVAL;
 231                 }
 232         }
 233
 234         /* calculate the checksum */
 235         orig_sum = 0;
 236         i = (MC_HEADER_SIZE + data_size) / DWSIZE;
 237         while (i--)
 238                 orig_sum += ((int *)mc)[i];
 239         if (orig_sum) {
 240                 printk(KERN_ERR "microcode: aborting, bad checksum\n");
 241                 return -EINVAL;
 242         }
 243         if (!ext_table_size)
 244                 return 0;
 245         /* check extended signature checksum */
 246         for (i = 0; i < ext_sigcount; i++) {
 247                 ext_sig = (struct extended_signature *)((void *)ext_header
 248                         + EXT_HEADER_SIZE + EXT_SIGNATURE_SIZE * i);
 249                 sum = orig_sum
 250                         - (mc_header->sig + mc_header->pf + mc_header->cksum)
 251                         + (ext_sig->sig + ext_sig->pf + ext_sig->cksum);
 252                 if (sum) {
 253                         printk(KERN_ERR "microcode: aborting, bad checksum\n");
 254                         return -EINVAL;
 255                 }
 256         }
 257         return 0;
 258 }
 259
 260 /*
 261  * return 0 - no update found
 262  * return 1 - found update
 263  * return < 0 - error
 264  */
 265 static int get_maching_microcode(void *mc, int cpu)
 266 {
 267         struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
 268         microcode_header_t *mc_header = mc;
 269         struct extended_sigtable *ext_header;
 270         unsigned long total_size = get_totalsize(mc_header);
 271         int ext_sigcount, i;
 272         struct extended_signature *ext_sig;
 273         void *new_mc;
 274
 275         if (microcode_update_match(cpu, mc_header,
 276                         mc_header->sig, mc_header->pf))
 277                 goto find;
 278
 279         if (total_size <= get_datasize(mc_header) + MC_HEADER_SIZE)
 280                 return 0;
 281
 282         ext_header = (struct extended_sigtable *)(mc +
 283                         get_datasize(mc_header) + MC_HEADER_SIZE);
 284         ext_sigcount = ext_header->count;
 285         ext_sig = (struct extended_signature *)((void *)ext_header
 286                         + EXT_HEADER_SIZE);
 287         for (i = 0; i < ext_sigcount; i++) {
 288                 if (microcode_update_match(cpu, mc_header,
 289                                 ext_sig->sig, ext_sig->pf))
 290                         goto find;
 291                 ext_sig++;
 292         }
 293         return 0;
 294 find:
 295         pr_debug("microcode: CPU %d found a matching microcode update with"
 296                 " version 0x%x (current=0x%x)\n", cpu, mc_header->rev,uci->rev);
 297         new_mc = vmalloc(total_size);
 298         if (!new_mc) {
 299                 printk(KERN_ERR "microcode: error! Can not allocate memory\n");
 300                 return -ENOMEM;
 301         }
 302
 303         /* free previous update file */
 304         vfree(uci->mc);
 305
 306         memcpy(new_mc, mc, total_size);
 307         uci->mc = new_mc;
 308         return 1;
 309 }
 310
 311 static void apply_microcode(int cpu)
 312 {
 313         unsigned long flags;
 314         unsigned int val[2];
 315         int cpu_num = raw_smp_processor_id();
 316         struct ucode_cpu_info *uci = ucode_cpu_info + cpu_num;
 317
 318         /* We should bind the task to the CPU */
 319         BUG_ON(cpu_num != cpu);
 320
 321         if (uci->mc == NULL)
 322                 return;
 323
 324         /* serialize access to the physical write to MSR 0x79 */
 325         spin_lock_irqsave(&microcode_update_lock, flags);
 326
 327         /* write microcode via MSR 0x79 */
 328         wrmsr(MSR_IA32_UCODE_WRITE,
 329                 (unsigned long) uci->mc->bits,
 330                 (unsigned long) uci->mc->bits >> 16 >> 16);
 331         wrmsr(MSR_IA32_UCODE_REV, 0, 0);
 332
 333         /* see notes above for revision 1.07.  Apparent chip bug */
 334         sync_core();
 335
 336         /* get the current revision from MSR 0x8B */
 337         rdmsr(MSR_IA32_UCODE_REV, val[0], val[1]);
 338
 339         spin_unlock_irqrestore(&microcode_update_lock, flags);
 340         if (val[1] != uci->mc->hdr.rev) {
 341                 printk(KERN_ERR "microcode: CPU%d updated from revision "
 342                         "0x%x to 0x%x failed\n", cpu_num, uci->rev, val[1]);
 343                 return;
 344         }
 345         pr_debug("microcode: CPU%d updated from revision "
 346                "0x%x to 0x%x, date = %08x \n",
 347                cpu_num, uci->rev, val[1], uci->mc->hdr.date);
 348         uci->rev = val[1];
 349 }
 350
 351 #ifdef CONFIG_MICROCODE_OLD_INTERFACE
 352 static void __user *user_buffer;        /* user area microcode data buffer */
 353 static unsigned int user_buffer_size;   /* it's size */
 354
 355 static long get_next_ucode(void **mc, long offset)
 356 {
 357         microcode_header_t mc_header;
 358         unsigned long total_size;
 359
 360         /* No more data */
 361         if (offset >= user_buffer_size)
 362                 return 0;
 363         if (copy_from_user(&mc_header, user_buffer + offset, MC_HEADER_SIZE)) {
 364                 printk(KERN_ERR "microcode: error! Can not read user data\n");
 365                 return -EFAULT;
 366         }
 367         total_size = get_totalsize(&mc_header);
 368         if ((offset + total_size > user_buffer_size)
 369                 || (total_size < DEFAULT_UCODE_TOTALSIZE)) {
 370                 printk(KERN_ERR "microcode: error! Bad total size in microcode "
 371                                 "data file\n");
 372                 return -EINVAL;
 373         }
 374         *mc = vmalloc(total_size);
 375         if (!*mc)
 376                 return -ENOMEM;
 377         if (copy_from_user(*mc, user_buffer + offset, total_size)) {
 378                 printk(KERN_ERR "microcode: error! Can not read user data\n");
 379                 vfree(*mc);
 380                 return -EFAULT;
 381         }
 382         return offset + total_size;
 383 }
 384
 385 static int do_microcode_update (void)
 386 {
 387         long cursor = 0;
 388         int error = 0;
 389         void * new_mc;
 390         int cpu;
 391         cpumask_t old;
 392
 393         old = current->cpus_allowed;
 394
 395         while ((cursor = get_next_ucode(&new_mc, cursor)) > 0) {
 396                 error = microcode_sanity_check(new_mc);
 397                 if (error)
 398                         goto out;
 399                 /*
 400                  * It's possible the data file has multiple matching ucode,
 401                  * lets keep searching till the latest version
 402                  */
 403                 for_each_online_cpu(cpu) {
 404                         struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
 405
 406                         if (!uci->valid)
 407                                 continue;
 408                         set_cpus_allowed(current, cpumask_of_cpu(cpu));
 409                         error = get_maching_microcode(new_mc, cpu);
 410                         if (error < 0)
 411                                 goto out;
 412                         if (error == 1)
 413                                 apply_microcode(cpu);
 414                 }
 415                 vfree(new_mc);
 416         }
 417 out:
 418         if (cursor > 0)
 419                 vfree(new_mc);
 420         if (cursor < 0)
 421                 error = cursor;
 422         set_cpus_allowed(current, old);
 423         return error;
 424 }
 425
 426 static int microcode_open (struct inode *unused1, struct file *unused2)
 427 {
 428         return capable(CAP_SYS_RAWIO) ? 0 : -EPERM;
 429 }
 430
 431 static ssize_t microcode_write (struct file *file, const char __user *buf, size_t len, loff_t *ppos)
 432 {
 433         ssize_t ret;
 434
 435         if (len < DEFAULT_UCODE_TOTALSIZE) {
 436                 printk(KERN_ERR "microcode: not enough data\n");
 437                 return -EINVAL;
 438         }
 439
 440         if ((len >> PAGE_SHIFT) > num_physpages) {
 441                 printk(KERN_ERR "microcode: too much data (max %ld pages)\n", num_physpages);
 442                 return -EINVAL;
 443         }
 444
 445         lock_cpu_hotplug();
 446         mutex_lock(&microcode_mutex);
 447
 448         user_buffer = (void __user *) buf;
 449         user_buffer_size = (int) len;
 450
 451         ret = do_microcode_update();
 452         if (!ret)
 453                 ret = (ssize_t)len;
 454
 455         mutex_unlock(&microcode_mutex);
 456         unlock_cpu_hotplug();
 457
 458         return ret;
 459 }
 460
 461 static struct file_operations microcode_fops = {
 462         .owner          = THIS_MODULE,
 463         .write          = microcode_write,
 464         .open           = microcode_open,
 465 };
 466
 467 static struct miscdevice microcode_dev = {
 468         .minor          = MICROCODE_MINOR,
 469         .name           = "microcode",
 470         .fops           = &microcode_fops,
 471 };
 472
 473 static int __init microcode_dev_init (void)
 474 {
 475         int error;
 476
 477         error = misc_register(&microcode_dev);
 478         if (error) {
 479                 printk(KERN_ERR
 480                         "microcode: can't misc_register on minor=%d\n",
 481                         MICROCODE_MINOR);
 482                 return error;
 483         }
 484
 485         return 0;
 486 }
 487
 488 static void __exit microcode_dev_exit (void)
 489 {
 490         misc_deregister(&microcode_dev);
 491 }
 492
 493 MODULE_ALIAS_MISCDEV(MICROCODE_MINOR);
 494 #else
 495 #define microcode_dev_init() 0
 496 #define microcode_dev_exit() do { } while(0)
 497 #endif
 498
 499 static long get_next_ucode_from_buffer(void **mc, void *buf,
 500         unsigned long size, long offset)
 501 {
 502         microcode_header_t *mc_header;
 503         unsigned long total_size;
 504
 505         /* No more data */
 506         if (offset >= size)
 507                 return 0;
 508         mc_header = (microcode_header_t *)(buf + offset);
 509         total_size = get_totalsize(mc_header);
 510
 511         if ((offset + total_size > size)
 512                 || (total_size < DEFAULT_UCODE_TOTALSIZE)) {
 513                 printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
 514                 return -EINVAL;
 515         }
 516
 517         *mc = vmalloc(total_size);
 518         if (!*mc) {
 519                 printk(KERN_ERR "microcode: error! Can not allocate memory\n");
 520                 return -ENOMEM;
 521         }
 522         memcpy(*mc, buf + offset, total_size);
 523         return offset + total_size;
 524 }
 525
 526 /* fake device for request_firmware */
 527 static struct platform_device *microcode_pdev;
 528
 529 static int cpu_request_microcode(int cpu)
 530 {
 531         char name[30];
 532         struct cpuinfo_x86 *c = cpu_data + cpu;
 533         const struct firmware *firmware;
 534         void * buf;
 535         unsigned long size;
 536         long offset = 0;
 537         int error;
 538         void *mc;
 539
 540         /* We should bind the task to the CPU */
 541         BUG_ON(cpu != raw_smp_processor_id());
 542         sprintf(name,"intel-ucode/%02x-%02x-%02x",
 543                 c->x86, c->x86_model, c->x86_mask);
 544         error = request_firmware(&firmware, name, &microcode_pdev->dev);
 545         if (error) {
 546                 pr_debug("ucode data file %s load failed\n", name);
 547                 return error;
 548         }
 549         buf = (void *)firmware->data;
 550         size = firmware->size;
 551         while ((offset = get_next_ucode_from_buffer(&mc, buf, size, offset))
 552                         > 0) {
 553                 error = microcode_sanity_check(mc);
 554                 if (error)
 555                         break;
 556                 error = get_maching_microcode(mc, cpu);
 557                 if (error < 0)
 558                         break;
 559                 /*
 560                  * It's possible the data file has multiple matching ucode,
 561                  * lets keep searching till the latest version
 562                  */
 563                 if (error == 1) {
 564                         apply_microcode(cpu);
 565                         error = 0;
 566                 }
 567                 vfree(mc);
 568         }
 569         if (offset > 0)
 570                 vfree(mc);
 571         if (offset < 0)
 572                 error = offset;
 573         release_firmware(firmware);
 574
 575         return error;
 576 }
 577
 578 static void microcode_init_cpu(int cpu)
 579 {
 580         cpumask_t old;
 581         struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
 582
 583         old = current->cpus_allowed;
 584
 585         set_cpus_allowed(current, cpumask_of_cpu(cpu));
 586         mutex_lock(&microcode_mutex);
 587         collect_cpu_info(cpu);
 588         if (uci->valid)
 589                 cpu_request_microcode(cpu);
 590         mutex_unlock(&microcode_mutex);
 591         set_cpus_allowed(current, old);
 592 }
 593
 594 static void microcode_fini_cpu(int cpu)
 595 {
 596         struct ucode_cpu_info *uci = ucode_cpu_info + cpu;
 597
 598         mutex_lock(&microcode_mutex);
 599         uci->valid = 0;
 600         vfree(uci->mc);
 601         uci->mc = NULL;
 602         mutex_unlock(&microcode_mutex);
 603 }
 604
 605 static int __init microcode_init (void)
 606 {
 607         int error;
 608
 609         error = microcode_dev_init();
 610         if (error)
 611                 return error;
 612         microcode_pdev = platform_device_register_simple("microcode", -1,
 613                                                          NULL, 0);
 614         if (IS_ERR(microcode_pdev)) {
 615                 microcode_dev_exit();
 616                 return PTR_ERR(microcode_pdev);
 617         }
 618
 619         printk(KERN_INFO
 620                 "IA-32 Microcode Update Driver: v" MICROCODE_VERSION " <tigran@veritas.com>\n");
 621         return 0;
 622 }
 623
 624 static void __exit microcode_exit (void)
 625 {
 626         microcode_dev_exit();
 627         platform_device_unregister(microcode_pdev);
 628 }
 629
 630 module_init(microcode_init)
 631 module_exit(microcode_exit)