arm64: Allow the idreg override to deal with variable field width

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Currently, the override mechanism can only deal with 4bit fields,
which is the most common case. However, we now have a bunch of
ID registers that have more diverse field widths, such as
ID_AA64SMFR0_EL1, which has fields that are a single bit wide.

Add the support for variable width, and a macro that encodes
a feature width of 4 for all existing override.

No functional change.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220630160500.1536744-6-maz@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>

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Marc Zyngier 2022-06-30 17:04:56 +01:00 • committed by Will Deacon

parent fa8aa59ae6

commit 6b7ec18c09

1 changed files with 16 additions and 12 deletions

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arch/arm64/kernel/idreg-override.c

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