my private gentoo overlay
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/*
* Convert Intel microcode.dat into individual ucode files
* named: intel-ucode/$family-$model-$stepping
*
* The subdir intel-ucode/ is created in the current working
* directory. We get multiple ucodes in the same file, so they
* are appended to an existing file. Make sure the directory
* is empty before every run of the converter.
*
* Kay Sievers <kay.sievers@vrfy.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[])
{
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;
mkdir("intel-ucode", 0750);
start = 0;
for (;;) {
size_t size;
unsigned int family, model, stepping;
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
*/
family = (mc->hdr.sig >> 8) & 0xf;
if (family == 0xf)
family += (mc->hdr.sig >> 20) & 0xff;
model = (mc->hdr.sig >> 4) & 0x0f;
if (family == 0x06)
model += ((mc->hdr.sig >> 16) & 0x0f) << 4;
stepping = mc->hdr.sig & 0x0f;
year = mc->hdr.date & 0xffff;
month = mc->hdr.date >> 24;
day = (mc->hdr.date >> 16) & 0xff;
asprintf(&filename, "intel-ucode/%02x-%02x-%02x", family, model, stepping);
printf("\n");
printf("%s\n", filename);
printf("signature: 0x%02x\n", mc->hdr.sig);
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);
f = fopen(filename, "ae");
if (f == NULL) {
printf("open %s: %m\n", filename);
rc = EXIT_FAILURE;
goto out;
}
if (fwrite(mc, size, 1, f) != 1) {
printf("write %s: %m\n", filename);
rc = EXIT_FAILURE;
goto out;
}
fclose(f);
free(filename);
start += size;
if (start >= bufsize)
break;
}
printf("\n");
out:
return rc;
}