forked from mirrors/nixpkgs
155 lines
3.1 KiB
C
155 lines
3.1 KiB
C
/*
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* Convert Intel microcode.dat into a single binary microcode.bin file
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*
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* Based on code by Kay Sievers <kay.sievers@vrfy.org>
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* Changed to create a single file by Thomas Bächler <thomas@archlinux.org>
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*/
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#ifndef _GNU_SOURCE
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# define _GNU_SOURCE 1
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#endif
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <limits.h>
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#include <stdbool.h>
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#include <inttypes.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/stat.h>
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struct microcode_header_intel {
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unsigned int hdrver;
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unsigned int rev;
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unsigned int date;
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unsigned int sig;
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unsigned int cksum;
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unsigned int ldrver;
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unsigned int pf;
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unsigned int datasize;
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unsigned int totalsize;
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unsigned int reserved[3];
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};
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union mcbuf {
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struct microcode_header_intel hdr;
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unsigned int i[0];
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char c[0];
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};
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int main(int argc, char *argv[])
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{
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const char *filename = "/lib/firmware/microcode.dat";
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FILE *f;
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char line[LINE_MAX];
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char buf[4000000];
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union mcbuf *mc;
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size_t bufsize, count, start;
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int rc = EXIT_SUCCESS;
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if (argv[1] != NULL)
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filename = argv[1];
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count = 0;
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mc = (union mcbuf *) buf;
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f = fopen(filename, "re");
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if (f == NULL) {
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printf("open %s: %m\n", filename);
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rc = EXIT_FAILURE;
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goto out;
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}
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while (fgets(line, sizeof(line), f) != NULL) {
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if (sscanf(line, "%x, %x, %x, %x",
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&mc->i[count],
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&mc->i[count + 1],
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&mc->i[count + 2],
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&mc->i[count + 3]) != 4)
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continue;
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count += 4;
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}
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fclose(f);
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bufsize = count * sizeof(int);
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printf("%s: %lu(%luk) bytes, %zu integers\n",
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filename,
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bufsize,
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bufsize / 1024,
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count);
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if (bufsize < sizeof(struct microcode_header_intel))
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goto out;
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f = fopen("microcode.bin", "we");
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if (f == NULL) {
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printf("open microcode.bin: %m\n");
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rc = EXIT_FAILURE;
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goto out;
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}
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start = 0;
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for (;;) {
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size_t size;
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unsigned int family, model, stepping;
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unsigned int year, month, day;
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mc = (union mcbuf *) &buf[start];
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if (mc->hdr.totalsize)
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size = mc->hdr.totalsize;
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else
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size = 2000 + sizeof(struct microcode_header_intel);
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if (mc->hdr.ldrver != 1 || mc->hdr.hdrver != 1) {
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printf("unknown version/format:\n");
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rc = EXIT_FAILURE;
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break;
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}
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/*
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* 0- 3 stepping
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* 4- 7 model
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* 8-11 family
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* 12-13 type
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* 16-19 extended model
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* 20-27 extended family
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*/
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family = (mc->hdr.sig >> 8) & 0xf;
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if (family == 0xf)
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family += (mc->hdr.sig >> 20) & 0xff;
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model = (mc->hdr.sig >> 4) & 0x0f;
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if (family == 0x06)
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model += ((mc->hdr.sig >> 16) & 0x0f) << 4;
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stepping = mc->hdr.sig & 0x0f;
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year = mc->hdr.date & 0xffff;
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month = mc->hdr.date >> 24;
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day = (mc->hdr.date >> 16) & 0xff;
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printf("\n");
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printf("signature: 0x%02x\n", mc->hdr.sig);
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printf("flags: 0x%02x\n", mc->hdr.pf);
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printf("revision: 0x%02x\n", mc->hdr.rev);
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printf("date: %04x-%02x-%02x\n", year, month, day);
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printf("size: %zu\n", size);
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if (fwrite(mc, size, 1, f) != 1) {
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printf("write microcode.bin: %m\n");
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rc = EXIT_FAILURE;
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goto out;
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}
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start += size;
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if (start >= bufsize)
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break;
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}
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fclose(f);
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printf("\n");
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out:
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return rc;
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}
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