Function get_mh_cache

util/cbfstool/cbfstool.c:163–245

}

static struct mh_cache *get_mh_cache(void)
{
	static struct mh_cache mhc;

	/*
	 * A single invocation of cbfstool can process regions that use different CBFS metadata.
	 * Right now, the only such case is when Top Swap redundancy is in use. Check for Top
	 * Swap region to decide if the cache can be reused.
	 *
	 * This implicitly checks whether the cache is initialized.
	 */
	const enum mhc_kind kind = derive_mhc_kind(param.region_name);
	if (mhc.kind == kind)
		return &mhc;

	mhc.kind = kind;

	const struct fmap *fmap = partitioned_file_get_fmap(param.image_file);
	if (!fmap)
		goto no_metadata_hash;

	const char *bootblock_region = SECTION_NAME_BOOTBLOCK;
	if (kind == MHC_SECONDARY)
		bootblock_region = SECTION_NAME_BOOTBLOCK_B;

	/* Find the metadata_hash container. If there is a "BOOTBLOCK" FMAP section, it's
	   there. If not, it's a normal file in the primary CBFS section. */
	size_t offset, size;
	struct buffer buffer;
	if (fmap_find_area(fmap, bootblock_region)) {
		if (!partitioned_file_read_region(&buffer, param.image_file, bootblock_region))
			goto no_metadata_hash;
		mhc.region = bootblock_region;
		offset = 0;
		size = buffer.size;
	} else {
		if (kind != MHC_PRIMARY) {
			/* Top Swap requires BOOTBLOCK_B region. */
			ERROR("Malformed image: '%s' region is missing\n", bootblock_region);
			goto no_metadata_hash;
		}

		struct cbfs_image cbfs;
		struct cbfs_file *mh_container;
		if (!partitioned_file_read_region(&buffer, param.image_file, SECTION_NAME_PRIMARY_CBFS))
			goto no_metadata_hash;
		mhc.region = SECTION_NAME_PRIMARY_CBFS;
		if (cbfs_image_from_buffer(&cbfs, &buffer, param.headeroffset))
			goto no_metadata_hash;
		mh_container = cbfs_get_entry(&cbfs, "bootblock");
		if (!mh_container || be32toh(mh_container->type) != CBFS_TYPE_BOOTBLOCK) {
			/* Check for apu/amdfw file */
			mh_container = cbfs_get_entry(&cbfs, "apu/amdfw");
			if (!mh_container || be32toh(mh_container->type) != CBFS_TYPE_AMDFW)
				goto no_metadata_hash;
		}

		offset = (void *)mh_container + be32toh(mh_container->offset) -