wok-next view intel-microcode/stuff/intel-microcode2ucode.c @ rev 20528

Up tzdata (2018d)
author Aleksej Bobylev <al.bobylev@gmail.com>
date Sat Mar 24 11:10:32 2018 +0200 (2018-03-24)
parents
children
line source
1 /*
2 * Convert Intel microcode.dat into a single binary microcode.bin file
3 *
4 * Based on code by Kay Sievers <kay.sievers@vrfy.org>
5 * Changed to create a single file by Thomas Bächler <thomas@archlinux.org>
6 */
7
8
9 #ifndef _GNU_SOURCE
10 # define _GNU_SOURCE 1
11 #endif
12
13 #include <stdio.h>
14 #include <unistd.h>
15 #include <stdlib.h>
16 #include <string.h>
17 #include <time.h>
18 #include <limits.h>
19 #include <stdbool.h>
20 #include <inttypes.h>
21 #include <fcntl.h>
22 #include <errno.h>
23 #include <sys/stat.h>
24
25 struct microcode_header_intel {
26 unsigned int hdrver;
27 unsigned int rev;
28 unsigned int date;
29 unsigned int sig;
30 unsigned int cksum;
31 unsigned int ldrver;
32 unsigned int pf;
33 unsigned int datasize;
34 unsigned int totalsize;
35 unsigned int reserved[3];
36 };
37
38 union mcbuf {
39 struct microcode_header_intel hdr;
40 unsigned int i[0];
41 char c[0];
42 };
43
44 int main(int argc, char *argv[])
45 {
46 const char *filename = "/lib/firmware/microcode.dat";
47 FILE *f;
48 char line[LINE_MAX];
49 char buf[4000000];
50 union mcbuf *mc;
51 size_t bufsize, count, start;
52 int rc = EXIT_SUCCESS;
53
54 if (argv[1] != NULL)
55 filename = argv[1];
56
57 count = 0;
58 mc = (union mcbuf *) buf;
59 f = fopen(filename, "re");
60 if (f == NULL) {
61 printf("open %s: %m\n", filename);
62 rc = EXIT_FAILURE;
63 goto out;
64 }
65
66 while (fgets(line, sizeof(line), f) != NULL) {
67 if (sscanf(line, "%x, %x, %x, %x",
68 &mc->i[count],
69 &mc->i[count + 1],
70 &mc->i[count + 2],
71 &mc->i[count + 3]) != 4)
72 continue;
73 count += 4;
74 }
75 fclose(f);
76
77 bufsize = count * sizeof(int);
78 printf("%s: %lu(%luk) bytes, %zu integers\n",
79 filename,
80 bufsize,
81 bufsize / 1024,
82 count);
83
84 if (bufsize < sizeof(struct microcode_header_intel))
85 goto out;
86
87 f = fopen("microcode.bin", "we");
88 if (f == NULL) {
89 printf("open microcode.bin: %m\n");
90 rc = EXIT_FAILURE;
91 goto out;
92 }
93
94 start = 0;
95 for (;;) {
96 size_t size;
97 unsigned int family, model, stepping, type;
98 unsigned int year, month, day;
99
100 mc = (union mcbuf *) &buf[start];
101
102 if (mc->hdr.totalsize)
103 size = mc->hdr.totalsize;
104 else
105 size = 2000 + sizeof(struct microcode_header_intel);
106
107 if (mc->hdr.ldrver != 1 || mc->hdr.hdrver != 1) {
108 printf("unknown version/format:\n");
109 rc = EXIT_FAILURE;
110 break;
111 }
112
113 /*
114 * 0- 3 stepping
115 * 4- 7 model
116 * 8-11 family
117 * 12-13 type
118 * 16-19 extended model
119 * 20-27 extended family
120 */
121 stepping = mc->hdr.sig & 0x0f;
122 model = (mc->hdr.sig >> 4) & 0x0f;
123 family = (mc->hdr.sig >> 8) & 0x0f;
124 type = (mc->hdr.sig >> 12) & 0x0f;
125 if (family == 0x06)
126 model += ((mc->hdr.sig >> 16) & 0x0f) << 4;
127 if (family == 0x0f)
128 family += (mc->hdr.sig >> 20) & 0xff;
129
130 year = mc->hdr.date & 0xffff;
131 month = mc->hdr.date >> 24;
132 day = (mc->hdr.date >> 16) & 0xff;
133
134 printf("\n");
135 printf("signature: 0x%02x (stepping %d, model %d, family %d, type %d)\n",
136 mc->hdr.sig, stepping, model, family, type);
137 printf("flags: 0x%02x\n", mc->hdr.pf);
138 printf("revision: 0x%02x\n", mc->hdr.rev);
139 printf("date: %04x-%02x-%02x\n", year, month, day);
140 printf("size: %zu\n", size);
141
142 if (fwrite(mc, size, 1, f) != 1) {
143 printf("write microcode.bin: %m\n");
144 rc = EXIT_FAILURE;
145 goto out;
146 }
147
148 start += size;
149 if (start >= bufsize)
150 break;
151 }
152 fclose(f);
153 printf("\n");
154 out:
155 return rc;
156 }