diff options
| author | Masahiro Yamada <masahiroy@kernel.org> | 2022-01-10 03:15:29 +0900 |
|---|---|---|
| committer | Masahiro Yamada <masahiroy@kernel.org> | 2022-01-14 02:57:43 +0900 |
| commit | c4d7f40b250c1a4d74ed259e84807f58032507b6 (patch) | |
| tree | 5bbc3df1fd721ce81d9b4cbb0391f509e8231830 /scripts | |
| parent | 53e7b5dfb752399cd903ecb6e921dcaef57c8ea5 (diff) | |
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>
Diffstat (limited to 'scripts')
| -rw-r--r-- | scripts/Makefile.lib | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib index 4207a72d429f..05ca77706f6b 100644 --- a/scripts/Makefile.lib +++ b/scripts/Makefile.lib @@ -394,6 +394,9 @@ printf "%08x\n" $$dec_size | \ } \ ) +quiet_cmd_file_size = GEN $@ + cmd_file_size = $(size_append) > $@ + quiet_cmd_bzip2 = BZIP2 $@ cmd_bzip2 = cat $(real-prereqs) | $(KBZIP2) -9 > $@ |