Masahiro Yamada c4d7f40b25
kbuild: add cmd_file_size ...
Some architectures support self-extracting kernel, which embeds the
compressed vmlinux.
It has 4 byte data at the end so the decompressor can know the vmlinux
size beforehand.
GZIP natively has it in the trailer, but for the other compression
algorithms, the hand-crafted trailer is added.
It is unneeded to generate such _corrupted_ compressed files because
it is possible to pass the size data as a separate file.
For example, the assembly code:
.incbin "compressed-vmlinux-with-size-data"
can be transformed to:
.incbin "compressed-vmlinux"
.incbin "size-data"
My hope is, after some reworks of the decompressors, the macros
cmd_{bzip2,lzma,lzo,lz4,xzkern,zstd22}_with_size will go away.
This new macro, cmd_file_size, will be useful to generate a separate
size-data file.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org >
Reviewed-by: Nicolas Schier <n.schier@avm.de >
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