usr.sbin/cpucontrol/intel.c

   1 /*-
   2  * Copyright (c) 2006, 2008 Stanislav Sedov <stas@FreeBSD.org>.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include <sys/cdefs.h>
  27 __FBSDID("$FreeBSD: release/10.0.0/usr.sbin/cpucontrol/intel.c 245491 2013-01-16 05:00:51Z eadler $");
  28
  29 #include <assert.h>
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <unistd.h>
  34 #include <fcntl.h>
  35 #include <err.h>
  36 #include <errno.h>
  37
  38 #include <sys/types.h>
  39 #include <sys/stat.h>
  40 #include <sys/mman.h>
  41 #include <sys/ioctl.h>
  42 #include <sys/cpuctl.h>
  43
  44 #include <machine/cpufunc.h>
  45 #include <machine/specialreg.h>
  46
  47 #include "cpucontrol.h"
  48 #include "intel.h"
  49
  50 #define DEFAULT_UCODE_SIZE      2000 /* Size of update data if not specified. */
  51
  52 int
  53 intel_probe(int fd)
  54 {
  55         char vendor[13];
  56         int error;
  57         cpuctl_cpuid_args_t idargs = {
  58                 .level  = 0,
  59         };
  60
  61         error = ioctl(fd, CPUCTL_CPUID, &idargs);
  62         if (error < 0) {
  63                 WARN(0, "ioctl()");
  64                 return (1);
  65         }
  66         ((uint32_t *)vendor)[0] = idargs.data[1];
  67         ((uint32_t *)vendor)[1] = idargs.data[3];
  68         ((uint32_t *)vendor)[2] = idargs.data[2];
  69         vendor[12] = '\0';
  70         if (strncmp(vendor, INTEL_VENDOR_ID, sizeof(INTEL_VENDOR_ID)) != 0)
  71                 return (1);
  72         return (0);
  73 }
  74
  75 void
  76 intel_update(const char *dev, const char *path)
  77 {
  78         int fd, devfd;
  79         struct stat st;
  80         uint32_t *fw_image;
  81         int have_ext_table;
  82         uint32_t sum;
  83         unsigned int i;
  84         size_t payload_size;
  85         intel_fw_header_t *fw_header;
  86         intel_cpu_signature_t *ext_table;
  87         intel_ext_header_t *ext_header;
  88         uint32_t signature, flags;
  89         int32_t revision;
  90         ssize_t ext_size;
  91         size_t ext_table_size;
  92         void *fw_data;
  93         size_t data_size, total_size;
  94         cpuctl_msr_args_t msrargs = {
  95                 .msr = MSR_IA32_PLATFORM_ID,
  96         };
  97         cpuctl_cpuid_args_t idargs = {
  98                 .level  = 1,    /* Signature. */
  99         };
 100         cpuctl_update_args_t args;
 101         int error;
 102
 103         assert(path);
 104         assert(dev);
 105
 106         fd = -1;
 107         fw_image = MAP_FAILED;
 108         ext_table = NULL;
 109         ext_header = NULL;
 110         devfd = open(dev, O_RDWR);
 111         if (devfd < 0) {
 112                 WARN(0, "could not open %s for writing", dev);
 113                 return;
 114         }
 115         error = ioctl(devfd, CPUCTL_CPUID, &idargs);
 116         if (error < 0) {
 117                 WARN(0, "ioctl(%s)", dev);
 118                 goto fail;
 119         }
 120         signature = idargs.data[0];
 121         error = ioctl(devfd, CPUCTL_RDMSR, &msrargs);
 122         if (error < 0) {
 123                 WARN(0, "ioctl(%s)", dev);
 124                 goto fail;
 125         }
 126
 127         /*
 128          * MSR_IA32_PLATFORM_ID contains flag in BCD in bits 52-50.
 129          */
 130         flags = 1 << ((msrargs.data >> 50) & 7);
 131         msrargs.msr = MSR_BIOS_SIGN;
 132         error = ioctl(devfd, CPUCTL_RDMSR, &msrargs);
 133         if (error < 0) {
 134                 WARN(0, "ioctl(%s)", dev);
 135                 goto fail;
 136         }
 137         revision = msrargs.data >> 32; /* Revision in the high dword. */
 138         WARNX(2, "found cpu type %#x family %#x model %#x stepping %#x.",
 139             (signature >> 12) & 0x03, (signature >> 8) & 0x0f,
 140             (signature >> 4) & 0x0f, (signature >> 0) & 0x0f);
 141         /*
 142          * Open firmware image.
 143          */
 144         fd = open(path, O_RDONLY, 0);
 145         if (fd < 0) {
 146                 WARN(0, "open(%s)", path);
 147                 return;
 148         }
 149         error = fstat(fd, &st);
 150         if (error != 0) {
 151                 WARN(0, "fstat(%s)", path);
 152                 goto fail;
 153         }
 154         if (st.st_size < 0 || (unsigned)st.st_size < sizeof(*fw_header)) {
 155                 WARNX(2, "file too short: %s", path);
 156                 goto fail;
 157         }
 158
 159         /*
 160          * mmap the whole image.
 161          */
 162         fw_image = (uint32_t *)mmap(NULL, st.st_size, PROT_READ,
 163             MAP_PRIVATE, fd, 0);
 164         if  (fw_image == MAP_FAILED) {
 165                 WARN(0, "mmap(%s)", path);
 166                 goto fail;
 167         }
 168         fw_header = (intel_fw_header_t *)fw_image;
 169         if (fw_header->header_version != INTEL_HEADER_VERSION ||
 170             fw_header->loader_revision != INTEL_LOADER_REVISION) {
 171                 WARNX(2, "%s is not a valid intel firmware: version mismatch",
 172                     path);
 173                 goto fail;
 174         }
 175         /*
 176          * According to spec, if data_size == 0, then size of ucode = 2000.
 177          */
 178         if (fw_header->data_size == 0)
 179                 data_size = DEFAULT_UCODE_SIZE;
 180         else
 181                 data_size = fw_header->data_size;
 182         if (fw_header->total_size == 0)
 183                 total_size = data_size + sizeof(*fw_header);
 184         else
 185                 total_size = fw_header->total_size;
 186         if (total_size > (unsigned)st.st_size || st.st_size < 0) {
 187                 WARNX(2, "file too short: %s", path);
 188                 goto fail;
 189         }
 190         payload_size = data_size + sizeof(*fw_header);
 191
 192         /*
 193          * Check the primary checksum.
 194          */
 195         sum = 0;
 196         for (i = 0; i < (payload_size / sizeof(uint32_t)); i++)
 197                 sum += *((uint32_t *)fw_image + i);
 198         if (sum != 0) {
 199                 WARNX(2, "%s: update data checksum invalid", path);
 200                 goto fail;
 201         }
 202
 203         /*
 204          * Check if there is an extended signature table.
 205          */
 206         ext_size = total_size - payload_size;
 207         have_ext_table = 0;
 208
 209         if (ext_size > (signed)sizeof(*ext_header)) {
 210                 ext_header =
 211                     (intel_ext_header_t *)((char *)fw_image + payload_size);
 212                 ext_table = (intel_cpu_signature_t *)(ext_header + 1);
 213
 214                 /*
 215                  * Check the extended table size.
 216                  */
 217                 ext_table_size = sizeof(*ext_header) +
 218                     ext_header->sig_count * sizeof(*ext_table);
 219                 if (ext_table_size + payload_size > total_size) {
 220                         WARNX(2, "%s: broken extended signature table", path);
 221                         goto no_table;
 222                 }
 223
 224                 /*
 225                  * Check the extended table signature.
 226                  */
 227                 sum = 0;
 228                 for (i = 0; i < (ext_table_size / sizeof(uint32_t)); i++)
 229                         sum += *((uint32_t *)ext_header + i);
 230                 if (sum != 0) {
 231                         WARNX(2, "%s: extended signature table checksum invalid",
 232                             path);
 233                         goto no_table;
 234                 }
 235                 have_ext_table = 1;
 236         }
 237
 238 no_table:
 239         fw_data = fw_header + 1; /* Pointer to the update data. */
 240
 241         /*
 242          * Check if the given image is ok for this cpu.
 243          */
 244         if (signature == fw_header->cpu_signature &&
 245             (flags & fw_header->cpu_flags) != 0)
 246                         goto matched;
 247         else if (have_ext_table != 0) {
 248                 for (i = 0; i < ext_header->sig_count; i++) {
 249                         uint32_t sig = ext_table[i].cpu_signature;
 250                         if (signature == sig &&
 251                             (flags & ext_table[i].cpu_flags) != 0)
 252                                 goto matched;
 253                 }
 254         } else
 255                 goto fail;
 256
 257 matched:
 258         if (revision >= fw_header->revision) {
 259                 WARNX(1, "skipping %s of rev %#x: up to date",
 260                     path, fw_header->revision);
 261                 return;
 262         }
 263         fprintf(stderr, "%s: updating cpu %s from rev %#x to rev %#x... ",
 264                         path, dev, revision, fw_header->revision);
 265         args.data = fw_data;
 266         args.size = data_size;
 267         error = ioctl(devfd, CPUCTL_UPDATE, &args);
 268         if (error < 0) {
 269                error = errno;
 270                 fprintf(stderr, "failed.\n");
 271                errno = error;
 272                 WARN(0, "ioctl()");
 273                 goto fail;
 274         }
 275         fprintf(stderr, "done.\n");
 276
 277 fail:
 278         if (fw_image != MAP_FAILED)
 279                 if (munmap(fw_image, st.st_size) != 0)
 280                         warn("munmap(%s)", path);
 281         if (devfd >= 0)
 282                 close(devfd);
 283         if (fd >= 0)
 284                 close(fd);
 285         return;
 286 }