Function create_fmap_template

util/ifdtool/ifdtool.c:1106–1177

Writes a complete .fmd for the IFD layout (valid input for fmaptool). * coreboot replaces the SI_BIOS line with a top-aligned region and sub-layout. */

 * coreboot replaces the SI_BIOS line with a top-aligned region and sub-layout.
 */
static void create_fmap_template(char *image, int size, const char *layout_fname)
{
	const struct frba *frba = find_frba(image, size);
	if (!frba)
		exit(EXIT_FAILURE);

	int layout_fd = open(layout_fname, O_WRONLY | O_CREAT | O_TRUNC, 0644);
	if (layout_fd == -1) {
		perror("Could not open file");
		exit(EXIT_FAILURE);
	}

	unsigned int flash_size = ifd_image_size(frba);
	char buf[LAYOUT_LINELEN];

	snprintf(buf, LAYOUT_LINELEN, "FLASH 0x%X {\n", flash_size);
	if (write(layout_fd, buf, strlen(buf)) < 0) {
		perror("Could not write to file");
		exit(EXIT_FAILURE);
	}

	/* fmaptool requires regions in .fmd to be sorted by base address. */
	int count_regions = 0;
	struct region sorted_regions[MAX_REGIONS] = { 0 };
	for (unsigned int i = 0; i < max_regions; i++) {
		struct region region = get_region(frba, i);

		/* A region limit of 0 is an indicator of an unused region
		 * A region base of 7FFFh is an indicator of a reserved region
		 */
		if (region.limit == 0 || region.base == 0x07FFF000)
			continue;

		/* Is there an FMAP equivalent? IFD reserved regions are usually thrown out
		 * of the FMAP here
		 */
		if (!region_names[region.type].fmapname) {
			printf("Skip IFD region: %s\n", region_names[region.type].pretty);
			continue;
		}

		sorted_regions[count_regions] = region;
		/* insertion sort by base */
		for (int j = count_regions - 1; j >= 0; j--) {
			if (sorted_regions[j].base > sorted_regions[j + 1].base) {
				struct region tmp = sorted_regions[j];
				sorted_regions[j] = sorted_regions[j + 1];
				sorted_regions[j + 1] = tmp;
			}
		}
		count_regions++;
	}

	for (int i = 0; i < count_regions; i++) {
		struct region region = sorted_regions[i];

		snprintf(buf, LAYOUT_LINELEN, "\t%s@0x%X 0x%X\n",
			 region_names[region.type].fmapname, region.base, region.size);