usr.sbin/cpucontrol/amd.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2006, 2008 Stanislav Sedov <stas@FreeBSD.org>.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26  */
  27
  28 #include <sys/cdefs.h>
  29 __FBSDID("$FreeBSD$");
  30
  31 #include <assert.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <unistd.h>
  36 #include <fcntl.h>
  37 #include <err.h>
  38
  39 #include <sys/types.h>
  40 #include <sys/stat.h>
  41 #include <sys/mman.h>
  42 #include <sys/ioctl.h>
  43 #include <sys/ioccom.h>
  44 #include <sys/cpuctl.h>
  45
  46 #include <machine/cpufunc.h>
  47 #include <machine/specialreg.h>
  48
  49 #include "cpucontrol.h"
  50 #include "amd.h"
  51
  52 int
  53 amd_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, AMD_VENDOR_ID, sizeof(AMD_VENDOR_ID)) != 0)
  71                 return (1);
  72         return (0);
  73 }
  74
  75 void
  76 amd_update(const char *dev, const char *path)
  77 {
  78         int fd, devfd;
  79         unsigned int i;
  80         struct stat st;
  81         uint32_t *fw_image;
  82         amd_fw_header_t *fw_header;
  83         uint32_t sum;
  84         uint32_t signature;
  85         uint32_t *fw_data;
  86         size_t fw_size;
  87         cpuctl_cpuid_args_t idargs = {
  88                 .level  = 1,    /* Request signature. */
  89         };
  90         cpuctl_update_args_t args;
  91         int error;
  92
  93         assert(path);
  94         assert(dev);
  95
  96         fd  = -1;
  97         fw_image = MAP_FAILED;
  98         devfd = open(dev, O_RDWR);
  99         if (devfd < 0) {
 100                 WARN(0, "could not open %s for writing", dev);
 101                 return;
 102         }
 103         error = ioctl(devfd, CPUCTL_CPUID, &idargs);
 104         if (error < 0) {
 105                 WARN(0, "ioctl()");
 106                 goto fail;
 107         }
 108         signature = idargs.data[0];
 109         WARNX(2, "found cpu family %#x model %#x "
 110             "stepping %#x extfamily %#x extmodel %#x.",
 111             (signature >> 8) & 0x0f, (signature >> 4) & 0x0f,
 112             (signature >> 0) & 0x0f, (signature >> 20) & 0xff,
 113             (signature >> 16) & 0x0f);
 114
 115         /*
 116          * Open the firmware file.
 117          */
 118         fd = open(path, O_RDONLY, 0);
 119         if (fd < 0) {
 120                 WARN(0, "open(%s)", path);
 121                 goto fail;
 122         }
 123         error = fstat(fd, &st);
 124         if (error != 0) {
 125                 WARN(0, "fstat(%s)", path);
 126                 goto fail;
 127         }
 128         if (st.st_size < 0 || (unsigned)st.st_size < sizeof(*fw_header)) {
 129                 WARNX(2, "file too short: %s", path);
 130                 goto fail;
 131         }
 132         /*
 133          * mmap the whole image.
 134          */
 135         fw_image = (uint32_t *)mmap(NULL, st.st_size, PROT_READ,
 136             MAP_PRIVATE, fd, 0);
 137         if  (fw_image == MAP_FAILED) {
 138                 WARN(0, "mmap(%s)", path);
 139                 goto fail;
 140         }
 141         fw_header = (amd_fw_header_t *)fw_image;
 142         if ((fw_header->magic >> 8) != AMD_MAGIC) {
 143                 WARNX(2, "%s is not a valid amd firmware: version mismatch",
 144                     path);
 145                 goto fail;
 146         }
 147         fw_data = (uint32_t *)(fw_header + 1);
 148         fw_size = (st.st_size - sizeof(*fw_header)) / sizeof(uint32_t);
 149
 150         /*
 151          * Check the primary checksum.
 152          */
 153         sum = 0;
 154         for (i = 0; i < fw_size; i++)
 155                 sum += fw_data[i];
 156         if (sum != fw_header->checksum) {
 157                 WARNX(2, "%s: update data checksum invalid", path);
 158                 goto fail;
 159         }
 160         if (signature == fw_header->signature) {
 161                 fprintf(stderr, "%s: updating cpu %s... ", path, dev);
 162
 163                 args.data = fw_image;
 164                 args.size = st.st_size;
 165                 error = ioctl(devfd, CPUCTL_UPDATE, &args);
 166                 if (error < 0) {
 167                         fprintf(stderr, "failed.\n");
 168                         warn("ioctl()");
 169                         goto fail;
 170                 }
 171                 fprintf(stderr, "done.\n");
 172         }
 173
 174 fail:
 175         if (fd >= 0)
 176                 close(fd);
 177         if (devfd >= 0)
 178                 close(devfd);
 179         if (fw_image != MAP_FAILED)
 180                 if(munmap(fw_image, st.st_size) != 0)
 181                         warn("munmap(%s)", path);
 182         return;
 183 }