aboutsummaryrefslogtreecommitdiffstats
path: root/non-free/intel-ucode/intel-microcode2ucode.c
blob: fe410ac86ef8c98adbc5b07d5574cc928a6ae763 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
/*
 * Convert Intel microcode.dat into a single binary microcode.bin file
 *
 * Based on code by Kay Sievers <kay.sievers@vrfy.org>
 * Changed to create a single file by Thomas Bächler <thomas@archlinux.org>
 */


#ifndef _GNU_SOURCE
# define _GNU_SOURCE 1
#endif

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <limits.h>
#include <stdbool.h>
#include <inttypes.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/stat.h>

struct microcode_header_intel {
	unsigned int hdrver;
	unsigned int rev;
	unsigned int date;
	unsigned int sig;
	unsigned int cksum;
	unsigned int ldrver;
	unsigned int pf;
	unsigned int datasize;
	unsigned int totalsize;
	unsigned int reserved[3];
};

union mcbuf {
	struct microcode_header_intel hdr;
	unsigned int i[0];
	char c[0];
};

int main(int argc, char *argv[])
{
	const char *filename = "/lib/firmware/microcode.dat";
	FILE *f;
	char line[LINE_MAX];
	char buf[4000000];
	union mcbuf *mc;
	size_t bufsize, count, start;
	int rc = EXIT_SUCCESS;

	if (argv[1] != NULL)
		filename = argv[1];

	count = 0;
	mc = (union mcbuf *) buf;
	f = fopen(filename, "re");
	if (f == NULL) {
		printf("open %s: %m\n", filename);
		rc = EXIT_FAILURE;
		goto out;
	}

	while (fgets(line, sizeof(line), f) != NULL) {
		if (sscanf(line, "%x, %x, %x, %x",
		    &mc->i[count],
		    &mc->i[count + 1],
		    &mc->i[count + 2],
		    &mc->i[count + 3]) != 4)
			continue;
		count += 4;
	}
	fclose(f);

	bufsize = count * sizeof(int);
	printf("%s: %lu(%luk) bytes, %zu integers\n",
	       filename,
	       bufsize,
	       bufsize / 1024,
	       count);

	if (bufsize < sizeof(struct microcode_header_intel))
		goto out;

	f = fopen("microcode.bin", "we");
	if (f == NULL) {
		printf("open microcode.bin: %m\n");
		rc = EXIT_FAILURE;
		goto out;
	}

	start = 0;
	for (;;) {
		size_t size;
		unsigned int family, model, stepping, type;
		unsigned int year, month, day;

		mc = (union mcbuf *) &buf[start];

		if (mc->hdr.totalsize)
			size = mc->hdr.totalsize;
		else
			size = 2000 + sizeof(struct microcode_header_intel);

		if (mc->hdr.ldrver != 1 || mc->hdr.hdrver != 1) {
			printf("unknown version/format:\n");
			rc = EXIT_FAILURE;
			break;
		}

		/*
		 *  0- 3 stepping
		 *  4- 7 model
		 *  8-11 family
		 * 12-13 type
		 * 16-19 extended model
		 * 20-27 extended family
		 */
		stepping = mc->hdr.sig & 0x0f;
		model = (mc->hdr.sig >> 4) & 0x0f;
		family = (mc->hdr.sig >> 8) & 0x0f;
		type = (mc->hdr.sig >> 12) & 0x0f;
		if (family == 0x06)
			model += ((mc->hdr.sig >> 16) & 0x0f) << 4;
		if (family == 0x0f)
			family += (mc->hdr.sig >> 20) & 0xff;

		year = mc->hdr.date & 0xffff;
		month = mc->hdr.date >> 24;
		day = (mc->hdr.date >> 16) & 0xff;

		printf("\n");
		printf("signature: 0x%02x (stepping %d, model %d, family %d, type %d)\n",
			mc->hdr.sig, stepping, model, family, type);
		printf("flags:     0x%02x\n", mc->hdr.pf);
		printf("revision:  0x%02x\n", mc->hdr.rev);
		printf("date:      %04x-%02x-%02x\n", year, month, day);
		printf("size:      %zu\n", size);

		if (fwrite(mc, size, 1, f) != 1) {
			printf("write microcode.bin: %m\n");
			rc = EXIT_FAILURE;
			goto out;
		}

		start += size;
		if (start >= bufsize)
			break;
	}
	fclose(f);
	printf("\n");
out:
	return rc;
}