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arm64: Support managing features from loader

Description

arm64: Support managing features from loader

Allow the user to enable/disable supported cpu features/errata from a
known tunable. This will allow the user to disable features, e.g. to
work around broken firmware. It can also be used to enable workarounds
for rare errata.

Reviewed by: imp
Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D52358

Details

Provenance
andrewAuthored on Sep 4 2025, 2:45 PM
Reviewer
imp
Differential Revision
D52358: arm64: Support managing features from loader
Parents
rG9204a315a71c: arm64: Add a sysctl to see if features are enabled
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