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: stable/11/usr.sbin/cpucontrol/via.c 330449 2018-03-05 07:26:05Z eadler $"); 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 53int 54via_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 78void 79via_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 217fail: 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} 227