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The CCSIDR_EL1 register contains an UNKNOWN field (which replaces fields that were actually defined in previous revisions of the architecture). Define an 'Unkn' field type modeled after the Res0/Res1 types to allow such description. This allows the generation of #define CCSIDR_EL1_UNKN (UL(0) | GENMASK_ULL(31, 28)) which may have its use one day. Hopefully the architecture doesn't add too many of those in the future. Signed-off-by: Marc Zyngier <maz@kernel.org> Signed-off-by: Akihiko Odaki <akihiko.odaki@gmail.com> Reviewed-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20230112023852.42012-2-akihiko.odaki@daynix.com Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.