[PATCH v2] arm64: Add basic JSON register parser

[Mark Brown]

On Thu, Jan 02, 2025 at 02:43:39PM +0000, Marc Zyngier wrote:
> We currently populate the sysreg file by hand from the ARM ARM,
> resulting in a bunch of errors being introduced on a regular basis.
> While there is an XML dump of the architecture produced on a quarterly
> basis, the license that comes attached to it excludes any sort of
> open-source usage.

...

> I completely expect this to quickly rewritten by people who know
> what they are doing (I don't) and improved as we understand more
> of the data model.

Thanks for jumping on this so quickly.  

Reviewed-by: Mark Brown <broonie at kernel.org>

to the extent I understand jq, and it seems to be doing sensible things
for the registers I've tried it with.  This is going to be useful for
getting started and it's helpful to see the feature dependencies.  Like
you suggest it's a good basis for further development, even if we also
get some other tools that won't stop this being useful.

What I was thinking with this stuff was to use something like Python and
parse the files into data structures in memory before outputting them,
then we can hopefully use that for things like diffing two architecture
versions while handling cases where we've intentionally diverged from
how the architecture describes things.  It'd be nice to have something
that'd go through and check for updates to registers we already have
mapped and provide an updated sysreg file.  It might however just be
easier to use something like this and then work with sysreg files using
text processing tools.
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