[PATCH 1/3] decompressors: Update xz to include ARM64 BCJ decoder

[Jules Maselbas]

On Thu, Sep 07, 2023 at 11:00:05AM +0200, Ahmad Fatoum wrote:
> On 06.09.23 17:08, Jules Maselbas wrote:
> > Update lib/xz/xz_dec_bcj.c and lib/xz/xz_private.h files from xz-embedded [1],
> > which include spelling fixes and the new ARM64 BCJ decoder which was recently
> > introduced into .xz file format version 1.1.0 (2022-12-11) [2].
> > 
> > [1] https://git.tukaani.org/?p=xz-embedded.git
> > [2] https://tukaani.org/xz/xz-file-format-1.1.0.txt
> > 
> > Signed-off-by: Jules Maselbas <jmaselbas at zdiv.net>
> > ---
> >  lib/Kconfig           |  4 ++++
> >  lib/decompress_unxz.c |  3 +++
> >  lib/xz/xz_dec_bcj.c   | 54 ++++++++++++++++++++++++++++++++++++++++---
> >  lib/xz/xz_private.h   |  3 +++
> >  4 files changed, 61 insertions(+), 3 deletions(-)
> > 
> > diff --git a/lib/Kconfig b/lib/Kconfig
> > index 758197b608..9291e5a8ff 100644
> > --- a/lib/Kconfig
> > +++ b/lib/Kconfig
> > @@ -42,6 +42,7 @@ config XZ_DECOMPRESS
> >  	select XZ_DEC_ARM
> >  	select XZ_DEC_ARMTHUMB
> >  	select XZ_DEC_SPARC
> > +	select XZ_DEC_ARM64
> 
> Hmm, maybe for PBL, we should only support the XZ BCJ filter that is chosen
> for barebox proper? If you are trying to get barebox binary size down,
> maybe you are inclined to check? :-)

indeed, i thought it was already the case. How would do that ? have two version
of the unxz binary object ? one for pbl and the other for barebox proper ?
Or maybe only select the relevent decoder ?

snip

> > diff --git a/lib/decompress_unxz.c b/lib/decompress_unxz.c
> > index a7e2d331ab..5c906932f8 100644
> > --- a/lib/decompress_unxz.c
> > +++ b/lib/decompress_unxz.c
> > @@ -132,6 +132,9 @@
> >  #endif
> >  #ifdef CONFIG_ARM
> >  #	define XZ_DEC_ARM
> > +#	ifdef CONFIG_CPU_64
> > +#		define XZ_DEC_ARM64
> > +#	endif
> >  #endif
I though this was used to _only_ have the decoder for the current architecture.