usr.sbin/cpucontrol/via.c

   1 /*-
   2  * Copyright (c) 2011 Fabien Thomas <fabient@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/via.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/ioccom.h>
  43 #include <sys/cpuctl.h>
  44
  45 #include <machine/cpufunc.h>
  46 #include <machine/specialreg.h>
  47
  48 #include "cpucontrol.h"
  49 #include "via.h"
  50
  51 int
  52 via_probe(int fd)
  53 {
  54         char vendor[13];
  55         int error;
  56         cpuctl_cpuid_args_t idargs = {
  57                 .level  = 0,
  58         };
  59
  60         error = ioctl(fd, CPUCTL_CPUID, &idargs);
  61         if (error < 0) {
  62                 WARN(0, "ioctl()");
  63                 return (1);
  64         }
  65         ((uint32_t *)vendor)[0] = idargs.data[1];
  66         ((uint32_t *)vendor)[1] = idargs.data[3];
  67         ((uint32_t *)vendor)[2] = idargs.data[2];
  68         vendor[12] = '\0';
  69         if (strncmp(vendor, CENTAUR_VENDOR_ID, sizeof(CENTAUR_VENDOR_ID)) != 0)
  70                 return (1);
  71
  72         /* TODO: detect Nano CPU. */
  73         return (0);
  74 }
  75
  76 void
  77 via_update(const char *dev, const char *path)
  78 {
  79         int fd, devfd;
  80         struct stat st;
  81         uint32_t *fw_image;
  82         uint32_t sum;
  83         unsigned int i;
  84         size_t payload_size;
  85         via_fw_header_t *fw_header;
  86         uint32_t signature;
  87         int32_t revision;
  88         void *fw_data;
  89         size_t data_size, total_size;
  90         cpuctl_msr_args_t msrargs = {
  91                 .msr = MSR_IA32_PLATFORM_ID,
  92         };
  93         cpuctl_cpuid_args_t idargs = {
  94                 .level  = 1,    /* Signature. */
  95         };
  96         cpuctl_update_args_t args;
  97         int error;
  98
  99         assert(path);
 100         assert(dev);
 101
 102         fd = -1;
 103         devfd = -1;
 104         fw_image = MAP_FAILED;
 105         devfd = open(dev, O_RDWR);
 106         if (devfd < 0) {
 107                 WARN(0, "could not open %s for writing", dev);
 108                 return;
 109         }
 110         error = ioctl(devfd, CPUCTL_CPUID, &idargs);
 111         if (error < 0) {
 112                 WARN(0, "ioctl(%s)", dev);
 113                 goto fail;
 114         }
 115         signature = idargs.data[0];
 116         error = ioctl(devfd, CPUCTL_RDMSR, &msrargs);
 117         if (error < 0) {
 118                 WARN(0, "ioctl(%s)", dev);
 119                 goto fail;
 120         }
 121
 122         /*
 123          * MSR_IA32_PLATFORM_ID contains flag in BCD in bits 52-50.
 124          */
 125         msrargs.msr = MSR_BIOS_SIGN;
 126         error = ioctl(devfd, CPUCTL_RDMSR, &msrargs);
 127         if (error < 0) {
 128                 WARN(0, "ioctl(%s)", dev);
 129                 goto fail;
 130         }
 131         revision = msrargs.data >> 32; /* Revision in the high dword. */
 132         WARNX(2, "found cpu type %#x family %#x model %#x stepping %#x.",
 133             (signature >> 12) & 0x03, (signature >> 8) & 0x0f,
 134             (signature >> 4) & 0x0f, (signature >> 0) & 0x0f);
 135         /*
 136          * Open firmware image.
 137          */
 138         fd = open(path, O_RDONLY, 0);
 139         if (fd < 0) {
 140                 WARN(0, "open(%s)", path);
 141                 return;
 142         }
 143         error = fstat(fd, &st);
 144         if (error != 0) {
 145                 WARN(0, "fstat(%s)", path);
 146                 goto fail;
 147         }
 148         if (st.st_size < 0 || (unsigned)st.st_size < sizeof(*fw_header)) {
 149                 WARNX(2, "file too short: %s", path);
 150                 goto fail;
 151         }
 152
 153         /*
 154          * mmap the whole image.
 155          */
 156         fw_image = (uint32_t *)mmap(NULL, st.st_size, PROT_READ,
 157             MAP_PRIVATE, fd, 0);
 158         if  (fw_image == MAP_FAILED) {
 159                 WARN(0, "mmap(%s)", path);
 160                 goto fail;
 161         }
 162         fw_header = (via_fw_header_t *)fw_image;
 163         if (fw_header->signature != VIA_HEADER_SIGNATURE ||
 164             fw_header->loader_revision != VIA_LOADER_REVISION) {
 165                 WARNX(2, "%s is not a valid via firmware: version mismatch",
 166                     path);
 167                 goto fail;
 168         }
 169         data_size = fw_header->data_size;
 170         total_size = fw_header->total_size;
 171         if (total_size > (unsigned)st.st_size || st.st_size < 0) {
 172                 WARNX(2, "file too short: %s", path);
 173                 goto fail;
 174         }
 175         payload_size = data_size + sizeof(*fw_header);
 176
 177         /*
 178          * Check the primary checksum.
 179          */
 180         sum = 0;
 181         for (i = 0; i < (payload_size / sizeof(uint32_t)); i++)
 182                 sum += *((uint32_t *)fw_image + i);
 183         if (sum != 0) {
 184                 WARNX(2, "%s: update data checksum invalid", path);
 185                 goto fail;
 186         }
 187
 188         fw_data = fw_header + 1; /* Pointer to the update data. */
 189
 190         /*
 191          * Check if the given image is ok for this cpu.
 192          */
 193         if (signature != fw_header->cpu_signature)
 194                 goto fail;
 195
 196         if (fw_header->revision != 0 && revision >= fw_header->revision) {
 197                 WARNX(1, "skipping %s of rev %#x: up to date",
 198                     path, fw_header->revision);
 199                 goto fail;
 200         }
 201         fprintf(stderr, "%s: updating cpu %s from rev %#x to rev %#x... ",
 202                         path, dev, revision, fw_header->revision);
 203         args.data = fw_data;
 204         args.size = data_size;
 205         error = ioctl(devfd, CPUCTL_UPDATE, &args);
 206         if (error < 0) {
 207                error = errno;
 208                 fprintf(stderr, "failed.\n");
 209                errno = error;
 210                 WARN(0, "ioctl()");
 211                 goto fail;
 212         }
 213         fprintf(stderr, "done.\n");
 214
 215 fail:
 216         if (fw_image != MAP_FAILED)
 217                 if (munmap(fw_image, st.st_size) != 0)
 218                         warn("munmap(%s)", path);
 219         if (devfd >= 0)
 220                 close(devfd);
 221         if (fd >= 0)
 222                 close(fd);
 223         return;
 224 }