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343a5efd AM |
1 | /* |
2 | * Convert Intel microcode.dat into individual ucode files | |
3 | * named: intel-ucode/$family-$model-$stepping | |
4 | * | |
5 | * The subdir intel-ucode/ is created in the current working | |
6 | * directory. We get multiple ucodes in the same file, so they | |
7 | * are appended to an existing file. Make sure the directory | |
8 | * is empty before every run of the converter. | |
9 | * | |
10 | * Kay Sievers <kay.sievers@vrfy.org> | |
11 | */ | |
12 | ||
13 | ||
14 | #ifndef _GNU_SOURCE | |
15 | # define _GNU_SOURCE 1 | |
16 | #endif | |
17 | ||
18 | #include <stdio.h> | |
19 | #include <unistd.h> | |
20 | #include <stdlib.h> | |
21 | #include <string.h> | |
22 | #include <time.h> | |
23 | #include <limits.h> | |
24 | #include <stdbool.h> | |
25 | #include <inttypes.h> | |
26 | #include <fcntl.h> | |
27 | #include <errno.h> | |
28 | #include <sys/stat.h> | |
29 | ||
30 | struct microcode_header_intel { | |
31 | unsigned int hdrver; | |
32 | unsigned int rev; | |
33 | unsigned int date; | |
34 | unsigned int sig; | |
35 | unsigned int cksum; | |
36 | unsigned int ldrver; | |
37 | unsigned int pf; | |
38 | unsigned int datasize; | |
39 | unsigned int totalsize; | |
40 | unsigned int reserved[3]; | |
41 | }; | |
42 | ||
43 | union mcbuf { | |
44 | struct microcode_header_intel hdr; | |
45 | unsigned int i[0]; | |
46 | char c[0]; | |
47 | }; | |
48 | ||
49 | int main(int argc, char *argv[]) | |
50 | { | |
51 | char *filename = "/lib/firmware/microcode.dat"; | |
52 | FILE *f; | |
53 | char line[LINE_MAX]; | |
54 | char buf[4000000]; | |
55 | union mcbuf *mc; | |
56 | size_t bufsize, count, start; | |
57 | int rc = EXIT_SUCCESS; | |
58 | ||
59 | if (argv[1] != NULL) | |
60 | filename = argv[1]; | |
61 | ||
62 | count = 0; | |
63 | mc = (union mcbuf *) buf; | |
64 | f = fopen(filename, "re"); | |
65 | if (f == NULL) { | |
66 | printf("open %s: %m\n", filename); | |
67 | rc = EXIT_FAILURE; | |
68 | goto out; | |
69 | } | |
70 | ||
71 | while (fgets(line, sizeof(line), f) != NULL) { | |
72 | if (sscanf(line, "%x, %x, %x, %x", | |
73 | &mc->i[count], | |
74 | &mc->i[count + 1], | |
75 | &mc->i[count + 2], | |
76 | &mc->i[count + 3]) != 4) | |
77 | continue; | |
78 | count += 4; | |
79 | } | |
80 | fclose(f); | |
81 | ||
82 | bufsize = count * sizeof(int); | |
83 | printf("%s: %lu(%luk) bytes, %zu integers\n", | |
84 | filename, | |
85 | bufsize, | |
86 | bufsize / 1024, | |
87 | count); | |
88 | ||
89 | if (bufsize < sizeof(struct microcode_header_intel)) | |
90 | goto out; | |
91 | ||
92 | mkdir("intel-ucode", 0750); | |
93 | ||
94 | start = 0; | |
95 | for (;;) { | |
96 | size_t size; | |
97 | unsigned int family, model, stepping; | |
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 | family = (mc->hdr.sig >> 8) & 0xf; | |
122 | if (family == 0xf) | |
123 | family += (mc->hdr.sig >> 20) & 0xff; | |
124 | model = (mc->hdr.sig >> 4) & 0x0f; | |
125 | if (family == 0x06) | |
126 | model += ((mc->hdr.sig >> 16) & 0x0f) << 4; | |
127 | stepping = mc->hdr.sig & 0x0f; | |
128 | ||
129 | year = mc->hdr.date & 0xffff; | |
130 | month = mc->hdr.date >> 24; | |
131 | day = (mc->hdr.date >> 16) & 0xff; | |
132 | ||
133 | asprintf(&filename, "intel-ucode/%02x-%02x-%02x", family, model, stepping); | |
134 | printf("\n"); | |
135 | printf("%s\n", filename); | |
136 | printf("signature: 0x%02x\n", mc->hdr.sig); | |
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 | f = fopen(filename, "ae"); | |
143 | if (f == NULL) { | |
144 | printf("open %s: %m\n", filename); | |
145 | rc = EXIT_FAILURE; | |
146 | goto out; | |
147 | } | |
148 | if (fwrite(mc, size, 1, f) != 1) { | |
149 | printf("write %s: %m\n", filename); | |
150 | rc = EXIT_FAILURE; | |
151 | goto out; | |
152 | } | |
153 | fclose(f); | |
154 | free(filename); | |
155 | ||
156 | start += size; | |
157 | if (start >= bufsize) | |
158 | break; | |
159 | } | |
160 | printf("\n"); | |
161 | out: | |
162 | return rc; | |
163 | } |