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bhnd(9): Fix a few mandoc related issues
[FreeBSD/FreeBSD.git] / tools / tools / intel-ucode-split / intel-ucode-split.c
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3  *
4  * Copyright (C) 2018 The FreeBSD Foundation.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  *
27  * $FreeBSD$
28  */
29
30 #include <err.h>
31 #include <fcntl.h>
32 #include <stdbool.h>
33 #include <stdint.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <unistd.h>
38
39 static const size_t bufsize = 65536;
40
41 /* SDM vol 3 9.11.1 Intel microcode header. */
42 struct microcode_update_header {
43         uint32_t header_version;
44         uint32_t update_revision;
45         uint32_t date;                  /* BCD mmddyyyy */
46         uint32_t processor_signature;
47         uint32_t checksum;              /* Over update data and header */
48         uint32_t loader_revision;
49         uint32_t processor_flags;
50         uint32_t data_size;
51         uint32_t total_size;
52         uint32_t reserved[3];
53 };
54
55 /*
56  * SDM vol 2A CPUID EAX = 01h Returns Model, Family, Stepping Information.
57  * Caller must free the returned string.
58  */
59
60 static char *
61 format_signature(uint32_t signature)
62 {
63         char *buf;
64         unsigned family, model, stepping;
65
66         family = (signature & 0xf00) >> 8;
67         model = (signature & 0xf0) >> 4;
68         stepping = signature & 0xf;
69         if (family == 0x06 || family == 0x0f)
70                 model += (signature & 0xf0000) >> 12;
71         if (family == 0x0f)
72                 family += (signature & 0xff00000) >> 20;
73         asprintf(&buf, "%02x-%02x-%02x", family, model, stepping);
74         if (buf == NULL)
75                 err(1, "asprintf");
76         return (buf);
77 }
78
79 static void
80 dump_header(const struct microcode_update_header *hdr)
81 {
82         char *sig_str;
83         int i;
84         bool platformid_printed;
85
86         sig_str = format_signature(hdr->processor_signature);
87         printf("header version\t0x%x\n", hdr->header_version);
88         printf("revision\t0x%x\n", hdr->update_revision);
89         printf("date\t\t0x%x\t%04x-%02x-%02x\n", hdr->date,
90             hdr->date & 0xffff, (hdr->date & 0xff000000) >> 24,
91             (hdr->date & 0xff0000) >> 16);
92         printf("signature\t0x%x\t\t%s\n", hdr->processor_signature, sig_str);
93         printf("checksum\t0x%x\n", hdr->checksum);
94         printf("loader revision\t0x%x\n", hdr->loader_revision);
95         printf("processor flags\t0x%x", hdr->processor_flags);
96         platformid_printed = false;
97         for (i = 0; i < 8; i++) {
98                 if (hdr->processor_flags & 1 << i) {
99                         printf("%s%d", platformid_printed ? ", " : "\t\t", i);
100                         platformid_printed = true;
101                 }
102         }
103         printf("\n");
104         printf("datasize\t0x%x\t\t0x%x\n", hdr->data_size,
105             hdr->data_size != 0 ? hdr->data_size : 2000);
106         printf("size\t\t0x%x\t\t0x%x\n", hdr->total_size,
107             hdr->total_size != 0 ? hdr->total_size : 2048);
108         free(sig_str);
109 }
110
111 static void
112 usage(void)
113 {
114
115         printf("ucode-split [-nv] microcode_file\n");
116         exit(1);
117 }
118
119 int
120 main(int argc, char *argv[])
121 {
122         struct microcode_update_header hdr;
123         char *buf, *output_file, *sig_str;
124         size_t len, resid;
125         ssize_t rv;
126         int c, ifd, ofd;
127         bool nflag, vflag;
128
129         nflag = vflag = false;
130         while ((c = getopt(argc, argv, "nv")) != -1) {
131                 switch (c) {
132                 case 'n':
133                         nflag = true;
134                         break;
135                 case 'v':
136                         vflag = true;
137                         break;
138                 default:
139                         usage();
140                 }
141         }
142         argc -= optind;
143         argv += optind;
144
145         if (argc != 1)
146                 usage();
147
148         ifd = open(argv[0], O_RDONLY);
149         if (ifd < 0)
150                 err(1, "open");
151
152         buf = malloc(bufsize);
153         if (buf == NULL)
154                 err(1, "malloc");
155
156         for (;;) {
157                 /* Read header. */
158                 rv = read(ifd, &hdr, sizeof(hdr));
159                 if (rv < 0) {
160                         err(1, "read");
161                 } else if (rv == 0) {
162                         break;
163                 } else if (rv < (ssize_t)sizeof(hdr)) {
164                         errx(1, "invalid microcode header");
165                 }
166                 if (hdr.header_version != 1)
167                         errx(1, "invalid header version");
168
169                 if (vflag)
170                         dump_header(&hdr);
171
172                 resid = (hdr.total_size != 0 ? hdr.total_size : 2048) -
173                     sizeof(hdr);
174                 if (resid > 1 << 24) /* Arbitrary chosen maximum size. */
175                         errx(1, "header total_size too large");
176
177                 if (nflag) {
178                         if (lseek(ifd, resid, SEEK_CUR) == -1)
179                                 err(1, "lseek");
180                         printf("\n");
181                 } else {
182                         sig_str = format_signature(hdr.processor_signature);
183                         asprintf(&output_file, "%s.%02x", sig_str,
184                             hdr.processor_flags & 0xff);
185                         free(sig_str);
186                         if (output_file == NULL)
187                                 err(1, "asprintf");
188                         ofd = open(output_file, O_WRONLY | O_CREAT | O_TRUNC,
189                             0600);
190                         if (ofd < 0)
191                                 err(1, "open");
192         
193                         /* Write header. */
194                         rv = write(ofd, &hdr, sizeof(hdr));
195                         if (rv < (ssize_t)sizeof(hdr))
196                                 err(1, "write");
197         
198                         /* Copy data. */
199                         while (resid > 0) {
200                                 len = resid < bufsize ? resid : bufsize;
201                                 rv = read(ifd, buf, len);
202                                 if (rv < 0)
203                                         err(1, "read");
204                                 else if (rv < (ssize_t)len)
205                                         errx(1, "truncated microcode data");
206                                 if (write(ofd, buf, len) < (ssize_t)len)
207                                         err(1, "write");
208                                 resid -= len;
209                         }
210                         if (vflag)
211                                 printf("written to %s\n\n", output_file);
212                         close(ofd);
213                         free(output_file);
214                 }
215         }
216 }