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Currently we require that software at a higher exception level initialise all registers at the exception level the kernel will be entered prior to starting the kernel in order to ensure that there is nothing uninitialised which could result in an UNKNOWN state while running the kernel. The expectation is that the software running at the highest exception levels will be tightly coupled to the system and can ensure that all available features are appropriately initialised and that the kernel can initialise anything else. There is a gap here in the case where new registers are added to lower exception levels that require initialisation but the kernel does not yet understand them. Extend the requirement to also include exception levels below the one where the kernel is entered to cover this. Suggested-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Mark Brown <broonie@kernel.org> Acked-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20210401180942.35815-4-broonie@kernel.org Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> |
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| README | ||
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.