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
via_probe(int fd)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
via_update(const struct ucode_update_params * params)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