via.c revision 302408
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: stable/11/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 51int 52via_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 76void 77via_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 215fail: 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} 225