uint16_t *efi_dp_str(struct efi_device_path *dp);
+/* GUID of the EFI_BLOCK_IO_PROTOCOL */
+extern const efi_guid_t efi_block_io_guid;
extern const efi_guid_t efi_global_variable_guid;
extern const efi_guid_t efi_guid_console_control;
extern const efi_guid_t efi_guid_device_path;