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 struct ucode_update_params *params) 80 { 81 int devfd; 82 const char *dev, *path; 83 const uint32_t *fw_image; 84 uint32_t sum; 85 unsigned int i; 86 size_t payload_size; 87 const via_fw_header_t *fw_header; 88 uint32_t signature; 89 int32_t revision; 90 const 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 dev = params->dev_path; 102 path = params->fw_path; 103 devfd = params->devfd; 104 fw_image = params->fwimage; 105 106 assert(path); 107 assert(dev); 108 109 error = ioctl(devfd, CPUCTL_CPUID, &idargs); 110 if (error < 0) { 111 WARN(0, "ioctl(%s)", dev); 112 goto fail; 113 } 114 signature = idargs.data[0]; 115 error = ioctl(devfd, CPUCTL_RDMSR, &msrargs); 116 if (error < 0) { 117 WARN(0, "ioctl(%s)", dev); 118 goto fail; 119 } 120 121 /* 122 * MSR_IA32_PLATFORM_ID contains flag in BCD in bits 52-50. 123 */ 124 msrargs.msr = MSR_BIOS_SIGN; 125 error = ioctl(devfd, CPUCTL_RDMSR, &msrargs); 126 if (error < 0) { 127 WARN(0, "ioctl(%s)", dev); 128 goto fail; 129 } 130 revision = msrargs.data >> 32; /* Revision in the high dword. */ 131 WARNX(2, "found cpu type %#x family %#x model %#x stepping %#x.", 132 (signature >> 12) & 0x03, (signature >> 8) & 0x0f, 133 (signature >> 4) & 0x0f, (signature >> 0) & 0x0f); 134 135 if (params->fwsize < sizeof(*fw_header)) { 136 WARNX(2, "file too short: %s", path); 137 goto fail; 138 } 139 140 fw_header = (const via_fw_header_t *)fw_image; 141 if (fw_header->signature != VIA_HEADER_SIGNATURE || 142 fw_header->loader_revision != VIA_LOADER_REVISION) { 143 WARNX(2, "%s is not a valid via firmware: version mismatch", 144 path); 145 goto fail; 146 } 147 data_size = fw_header->data_size; 148 total_size = fw_header->total_size; 149 if (total_size > params->fwsize) { 150 WARNX(2, "file too short: %s", path); 151 goto fail; 152 } 153 payload_size = data_size + sizeof(*fw_header); 154 155 /* 156 * Check the primary checksum. 157 */ 158 sum = 0; 159 for (i = 0; i < (payload_size / sizeof(uint32_t)); i++) 160 sum += *((const uint32_t *)fw_image + i); 161 if (sum != 0) { 162 WARNX(2, "%s: update data checksum invalid", path); 163 goto fail; 164 } 165 166 fw_data = fw_header + 1; /* Pointer to the update data. */ 167 168 /* 169 * Check if the given image is ok for this cpu. 170 */ 171 if (signature != fw_header->cpu_signature) 172 goto fail; 173 174 if (fw_header->revision != 0 && revision >= fw_header->revision) { 175 WARNX(1, "skipping %s of rev %#x: up to date", 176 path, fw_header->revision); 177 goto fail; 178 } 179 fprintf(stderr, "%s: updating cpu %s from rev %#x to rev %#x... ", 180 path, dev, revision, fw_header->revision); 181 args.data = __DECONST(void *, fw_data); 182 args.size = data_size; 183 error = ioctl(devfd, CPUCTL_UPDATE, &args); 184 if (error < 0) { 185 error = errno; 186 fprintf(stderr, "failed.\n"); 187 errno = error; 188 WARN(0, "ioctl()"); 189 goto fail; 190 } 191 fprintf(stderr, "done.\n"); 192 193 fail: 194 return; 195 } 196