Create the bootable image as an EFI application that carries the
actual kernel image in compressed form, and decompresses it into
memory before executing it via LoadImage/StartImage EFI boot service
calls. For compatibility with non-EFI loaders, the payload can be
decompressed and executed by the loader as well, provided that the
loader implements the decompression algorithm and that non-EFI boot
is supported by the encapsulated image. (The compression algorithm
used is described in the zboot image header)