arm64/gcs: Add manual encodings of GCS instructions

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Define C callable functions for GCS instructions used by the kernel. In
order to avoid ambitious toolchain requirements for GCS support these are
manually encoded, this means we have fixed register numbers which will be
a bit limiting for the compiler but none of these should be used in
sufficiently fast paths for this to be a problem.

Note that GCSSTTR is used to store to EL0.

Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20241001-arm64-gcs-v13-9-222b78d87eee@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Mark Brown 2024-10-01 23:58:48 +01:00 • committed by Catalin Marinas

parent ce0641d48d

commit dad947cc22

2 changed files with 73 additions and 0 deletions

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51

arch/arm64/include/asm/gcs.h

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22

arch/arm64/include/asm/uaccess.h

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