1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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 #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 struct ucode_update_params *params) 78 { 79 int devfd; 80 const char *dev, *path; 81 const uint32_t *fw_image; 82 uint32_t sum; 83 unsigned int i; 84 size_t payload_size; 85 const via_fw_header_t *fw_header; 86 uint32_t signature; 87 int32_t revision; 88 const 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 dev = params->dev_path; 100 path = params->fw_path; 101 devfd = params->devfd; 102 fw_image = params->fwimage; 103 104 assert(path); 105 assert(dev); 106 107 error = ioctl(devfd, CPUCTL_CPUID, &idargs); 108 if (error < 0) { 109 WARN(0, "ioctl(%s)", dev); 110 goto fail; 111 } 112 signature = idargs.data[0]; 113 error = ioctl(devfd, CPUCTL_RDMSR, &msrargs); 114 if (error < 0) { 115 WARN(0, "ioctl(%s)", dev); 116 goto fail; 117 } 118 119 /* 120 * MSR_IA32_PLATFORM_ID contains flag in BCD in bits 52-50. 121 */ 122 msrargs.msr = MSR_BIOS_SIGN; 123 error = ioctl(devfd, CPUCTL_RDMSR, &msrargs); 124 if (error < 0) { 125 WARN(0, "ioctl(%s)", dev); 126 goto fail; 127 } 128 revision = msrargs.data >> 32; /* Revision in the high dword. */ 129 WARNX(2, "found cpu type %#x family %#x model %#x stepping %#x.", 130 (signature >> 12) & 0x03, (signature >> 8) & 0x0f, 131 (signature >> 4) & 0x0f, (signature >> 0) & 0x0f); 132 133 if (params->fwsize < sizeof(*fw_header)) { 134 WARNX(2, "file too short: %s", path); 135 goto fail; 136 } 137 138 fw_header = (const via_fw_header_t *)fw_image; 139 if (fw_header->signature != VIA_HEADER_SIGNATURE || 140 fw_header->loader_revision != VIA_LOADER_REVISION) { 141 WARNX(2, "%s is not a valid via firmware: version mismatch", 142 path); 143 goto fail; 144 } 145 data_size = fw_header->data_size; 146 total_size = fw_header->total_size; 147 if (total_size > params->fwsize) { 148 WARNX(2, "file too short: %s", path); 149 goto fail; 150 } 151 payload_size = data_size + sizeof(*fw_header); 152 153 /* 154 * Check the primary checksum. 155 */ 156 sum = 0; 157 for (i = 0; i < (payload_size / sizeof(uint32_t)); i++) 158 sum += *((const uint32_t *)fw_image + i); 159 if (sum != 0) { 160 WARNX(2, "%s: update data checksum invalid", path); 161 goto fail; 162 } 163 164 fw_data = fw_header + 1; /* Pointer to the update data. */ 165 166 /* 167 * Check if the given image is ok for this cpu. 168 */ 169 if (signature != fw_header->cpu_signature) 170 goto fail; 171 172 if (fw_header->revision != 0 && revision >= fw_header->revision) { 173 WARNX(1, "skipping %s of rev %#x: up to date", 174 path, fw_header->revision); 175 goto fail; 176 } 177 fprintf(stderr, "%s: updating cpu %s from rev %#x to rev %#x... ", 178 path, dev, revision, fw_header->revision); 179 args.data = __DECONST(void *, fw_data); 180 args.size = data_size; 181 error = ioctl(devfd, CPUCTL_UPDATE, &args); 182 if (error < 0) { 183 error = errno; 184 fprintf(stderr, "failed.\n"); 185 errno = error; 186 WARN(0, "ioctl()"); 187 goto fail; 188 } 189 fprintf(stderr, "done.\n"); 190 191 fail: 192 return; 193 } 194