usr.sbin/cpucontrol/via.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2011 Fabien Thomas <fabient@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 #include <errno.h>
  39
  40 #include <sys/types.h>
  41 #include <sys/stat.h>
  42 #include <sys/mman.h>
  43 #include <sys/ioctl.h>
  44 #include <sys/ioccom.h>
  45 #include <sys/cpuctl.h>
  46
  47 #include <machine/cpufunc.h>
  48 #include <machine/specialreg.h>
  49
  50 #include "cpucontrol.h"
  51 #include "via.h"
  52
  53 int
  54 via_probe(int fd)
  55 {
  56         char vendor[13];
  57         int error;
  58         cpuctl_cpuid_args_t idargs = {
  59                 .level  = 0,
  60         };
  61
  62         error = ioctl(fd, CPUCTL_CPUID, &idargs);
  63         if (error < 0) {
  64                 WARN(0, "ioctl()");
  65                 return (1);
  66         }
  67         ((uint32_t *)vendor)[0] = idargs.data[1];
  68         ((uint32_t *)vendor)[1] = idargs.data[3];
  69         ((uint32_t *)vendor)[2] = idargs.data[2];
  70         vendor[12] = '\0';
  71         if (strncmp(vendor, CENTAUR_VENDOR_ID, sizeof(CENTAUR_VENDOR_ID)) != 0)
  72                 return (1);
  73
  74         /* TODO: detect Nano CPU. */
  75         return (0);
  76 }
  77
  78 void
  79 via_update(const char *dev, const char *path)
  80 {
  81         int fd, devfd;
  82         struct stat st;
  83         uint32_t *fw_image;
  84         uint32_t sum;
  85         unsigned int i;
  86         size_t payload_size;
  87         via_fw_header_t *fw_header;
  88         uint32_t signature;
  89         int32_t revision;
  90         void *fw_data;
  91         size_t data_size, total_size;
  92         cpuctl_msr_args_t msrargs = {
  93                 .msr = MSR_IA32_PLATFORM_ID,
  94         };
  95         cpuctl_cpuid_args_t idargs = {
  96                 .level  = 1,    /* Signature. */
  97         };
  98         cpuctl_update_args_t args;
  99         int error;
 100
 101         assert(path);
 102         assert(dev);
 103
 104         fd = -1;
 105         devfd = -1;
 106         fw_image = MAP_FAILED;
 107         devfd = open(dev, O_RDWR);
 108         if (devfd < 0) {
 109                 WARN(0, "could not open %s for writing", dev);
 110                 return;
 111         }
 112         error = ioctl(devfd, CPUCTL_CPUID, &idargs);
 113         if (error < 0) {
 114                 WARN(0, "ioctl(%s)", dev);
 115                 goto fail;
 116         }
 117         signature = idargs.data[0];
 118         error = ioctl(devfd, CPUCTL_RDMSR, &msrargs);
 119         if (error < 0) {
 120                 WARN(0, "ioctl(%s)", dev);
 121                 goto fail;
 122         }
 123
 124         /*
 125          * MSR_IA32_PLATFORM_ID contains flag in BCD in bits 52-50.
 126          */
 127         msrargs.msr = MSR_BIOS_SIGN;
 128         error = ioctl(devfd, CPUCTL_RDMSR, &msrargs);
 129         if (error < 0) {
 130                 WARN(0, "ioctl(%s)", dev);
 131                 goto fail;
 132         }
 133         revision = msrargs.data >> 32; /* Revision in the high dword. */
 134         WARNX(2, "found cpu type %#x family %#x model %#x stepping %#x.",
 135             (signature >> 12) & 0x03, (signature >> 8) & 0x0f,
 136             (signature >> 4) & 0x0f, (signature >> 0) & 0x0f);
 137         /*
 138          * Open firmware image.
 139          */
 140         fd = open(path, O_RDONLY, 0);
 141         if (fd < 0) {
 142                 WARN(0, "open(%s)", path);
 143                 goto fail;
 144         }
 145         error = fstat(fd, &st);
 146         if (error != 0) {
 147                 WARN(0, "fstat(%s)", path);
 148                 goto fail;
 149         }
 150         if (st.st_size < 0 || (unsigned)st.st_size < sizeof(*fw_header)) {
 151                 WARNX(2, "file too short: %s", path);
 152                 goto fail;
 153         }
 154
 155         /*
 156          * mmap the whole image.
 157          */
 158         fw_image = (uint32_t *)mmap(NULL, st.st_size, PROT_READ,
 159             MAP_PRIVATE, fd, 0);
 160         if  (fw_image == MAP_FAILED) {
 161                 WARN(0, "mmap(%s)", path);
 162                 goto fail;
 163         }
 164         fw_header = (via_fw_header_t *)fw_image;
 165         if (fw_header->signature != VIA_HEADER_SIGNATURE ||
 166             fw_header->loader_revision != VIA_LOADER_REVISION) {
 167                 WARNX(2, "%s is not a valid via firmware: version mismatch",
 168                     path);
 169                 goto fail;
 170         }
 171         data_size = fw_header->data_size;
 172         total_size = fw_header->total_size;
 173         if (total_size > (unsigned)st.st_size || st.st_size < 0) {
 174                 WARNX(2, "file too short: %s", path);
 175                 goto fail;
 176         }
 177         payload_size = data_size + sizeof(*fw_header);
 178
 179         /*
 180          * Check the primary checksum.
 181          */
 182         sum = 0;
 183         for (i = 0; i < (payload_size / sizeof(uint32_t)); i++)
 184                 sum += *((uint32_t *)fw_image + i);
 185         if (sum != 0) {
 186                 WARNX(2, "%s: update data checksum invalid", path);
 187                 goto fail;
 188         }
 189
 190         fw_data = fw_header + 1; /* Pointer to the update data. */
 191
 192         /*
 193          * Check if the given image is ok for this cpu.
 194          */
 195         if (signature != fw_header->cpu_signature)
 196                 goto fail;
 197
 198         if (fw_header->revision != 0 && revision >= fw_header->revision) {
 199                 WARNX(1, "skipping %s of rev %#x: up to date",
 200                     path, fw_header->revision);
 201                 goto fail;
 202         }
 203         fprintf(stderr, "%s: updating cpu %s from rev %#x to rev %#x... ",
 204                         path, dev, revision, fw_header->revision);
 205         args.data = fw_data;
 206         args.size = data_size;
 207         error = ioctl(devfd, CPUCTL_UPDATE, &args);
 208         if (error < 0) {
 209                error = errno;
 210                 fprintf(stderr, "failed.\n");
 211                errno = error;
 212                 WARN(0, "ioctl()");
 213                 goto fail;
 214         }
 215         fprintf(stderr, "done.\n");
 216
 217 fail:
 218         if (fw_image != MAP_FAILED)
 219                 if (munmap(fw_image, st.st_size) != 0)
 220                         warn("munmap(%s)", path);
 221         if (devfd >= 0)
 222                 close(devfd);
 223         if (fd >= 0)
 224                 close(fd);
 225         return;
 226 }