Function cb_parse_header

payloads/libpayload/libc/coreboot.c:309–470

}

int cb_parse_header(void *addr, int len, struct sysinfo_t *info)
{
	struct cb_header *header;
	unsigned char *ptr = addr;
	void *forward;
	int i;

	for (i = 0; i < len; i += 16, ptr += 16) {
		header = (struct cb_header *)ptr;
		if (!strncmp((const char *)header->signature, "LBIO", 4))
			break;
	}

	/* We walked the entire space and didn't find anything. */
	if (i >= len)
		return -1;

	/* Make sure the checksums match. */
	if (ipchksum((u16 *) header, sizeof(*header)) != 0)
		return -1;

	if (!header->table_bytes)
		return 0;

	if (ipchksum((u16 *) (ptr + sizeof(*header)),
		     header->table_bytes) != header->table_checksum)
		return -1;

	info->cb_header = virt_to_phys(header);

	/* Initialize IDs as undefined in case they don't show up in table. */
	info->board_id = UNDEFINED_STRAPPING_ID;
	info->ram_code = UNDEFINED_STRAPPING_ID;
	info->sku_id = UNDEFINED_STRAPPING_ID;
	info->fw_config = UNDEFINED_FW_CONFIG;

	/* Now, walk the tables. */
	ptr += header->header_bytes;

	for (i = 0; i < header->table_entries; i++) {
		struct cb_record *rec = (struct cb_record *)ptr;

		/* We only care about a few tags here (maybe more later). */
		switch (rec->tag) {
		case CB_TAG_FORWARD:
			forward = phys_to_virt((void *)(unsigned long)
					       ((struct cb_forward *)rec)->forward);
			return cb_parse_header(forward, len, info);
		case CB_TAG_MEMORY:
			cb_parse_memory(ptr, info);
			break;
		case CB_TAG_SERIAL:
			cb_parse_serial(ptr, info);
			break;
		case CB_TAG_VERSION:
			cb_parse_string(ptr, &info->cb_version);
			break;
		case CB_TAG_EXTRA_VERSION: