usr.sbin/cpucontrol/amd.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/amd.c 236504 2012-06-03 08:30:00Z avg $");
  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
  37 #include <sys/types.h>
  38 #include <sys/stat.h>
  39 #include <sys/mman.h>
  40 #include <sys/ioctl.h>
  41 #include <sys/ioccom.h>
  42 #include <sys/cpuctl.h>
  43
  44 #include <machine/cpufunc.h>
  45 #include <machine/specialreg.h>
  46
  47 #include "cpucontrol.h"
  48 #include "amd.h"
  49
  50 int
  51 amd_probe(int fd)
  52 {
  53         char vendor[13];
  54         int error;
  55         cpuctl_cpuid_args_t idargs = {
  56                 .level  = 0,
  57         };
  58
  59         error = ioctl(fd, CPUCTL_CPUID, &idargs);
  60         if (error < 0) {
  61                 WARN(0, "ioctl()");
  62                 return (1);
  63         }
  64         ((uint32_t *)vendor)[0] = idargs.data[1];
  65         ((uint32_t *)vendor)[1] = idargs.data[3];
  66         ((uint32_t *)vendor)[2] = idargs.data[2];
  67         vendor[12] = '\0';
  68         if (strncmp(vendor, AMD_VENDOR_ID, sizeof(AMD_VENDOR_ID)) != 0)
  69                 return (1);
  70         return (0);
  71 }
  72
  73 void
  74 amd_update(const char *dev, const char *path)
  75 {
  76         int fd, devfd;
  77         unsigned int i;
  78         struct stat st;
  79         uint32_t *fw_image;
  80         amd_fw_header_t *fw_header;
  81         uint32_t sum;
  82         uint32_t signature;
  83         uint32_t *fw_data;
  84         size_t fw_size;
  85         cpuctl_cpuid_args_t idargs = {
  86                 .level  = 1,    /* Request signature. */
  87         };
  88         cpuctl_update_args_t args;
  89         int error;
  90
  91         assert(path);
  92         assert(dev);
  93
  94         fd  = -1;
  95         fw_image = MAP_FAILED;
  96         devfd = open(dev, O_RDWR);
  97         if (devfd < 0) {
  98                 WARN(0, "could not open %s for writing", dev);
  99                 return;
 100         }
 101         error = ioctl(devfd, CPUCTL_CPUID, &idargs);
 102         if (error < 0) {
 103                 WARN(0, "ioctl()");
 104                 goto fail;
 105         }
 106         signature = idargs.data[0];
 107         WARNX(2, "found cpu family %#x model %#x "
 108             "stepping %#x extfamily %#x extmodel %#x.",
 109             (signature >> 8) & 0x0f, (signature >> 4) & 0x0f,
 110             (signature >> 0) & 0x0f, (signature >> 20) & 0xff,
 111             (signature >> 16) & 0x0f);
 112
 113         /*
 114          * Open the firmware file.
 115          */
 116         fd = open(path, O_RDONLY, 0);
 117         if (fd < 0) {
 118                 WARN(0, "open(%s)", path);
 119                 goto fail;
 120         }
 121         error = fstat(fd, &st);
 122         if (error != 0) {
 123                 WARN(0, "fstat(%s)", path);
 124                 goto fail;
 125         }
 126         if (st.st_size < 0 || (unsigned)st.st_size < sizeof(*fw_header)) {
 127                 WARNX(2, "file too short: %s", path);
 128                 goto fail;
 129         }
 130         /*
 131          * mmap the whole image.
 132          */
 133         fw_image = (uint32_t *)mmap(NULL, st.st_size, PROT_READ,
 134             MAP_PRIVATE, fd, 0);
 135         if  (fw_image == MAP_FAILED) {
 136                 WARN(0, "mmap(%s)", path);
 137                 goto fail;
 138         }
 139         fw_header = (amd_fw_header_t *)fw_image;
 140         if ((fw_header->magic >> 8) != AMD_MAGIC) {
 141                 WARNX(2, "%s is not a valid amd firmware: version mismatch",
 142                     path);
 143                 goto fail;
 144         }
 145         fw_data = (uint32_t *)(fw_header + 1);
 146         fw_size = (st.st_size - sizeof(*fw_header)) / sizeof(uint32_t);
 147
 148         /*
 149          * Check the primary checksum.
 150          */
 151         sum = 0;
 152         for (i = 0; i < fw_size; i++)
 153                 sum += fw_data[i];
 154         if (sum != fw_header->checksum) {
 155                 WARNX(2, "%s: update data checksum invalid", path);
 156                 goto fail;
 157         }
 158         if (signature == fw_header->signature) {
 159                 fprintf(stderr, "%s: updating cpu %s... ", path, dev);
 160
 161                 args.data = fw_image;
 162                 args.size = st.st_size;
 163                 error = ioctl(devfd, CPUCTL_UPDATE, &args);
 164                 if (error < 0) {
 165                         fprintf(stderr, "failed.\n");
 166                         warn("ioctl()");
 167                         goto fail;
 168                 }
 169                 fprintf(stderr, "done.\n");
 170         }
 171
 172 fail:
 173         if (fd >= 0)
 174                 close(fd);
 175         if (devfd >= 0)
 176                 close(devfd);
 177         if (fw_image != MAP_FAILED)
 178                 if(munmap(fw_image, st.st_size) != 0)
 179                         warn("munmap(%s)", path);
 180         return;
 181 }