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hwpstate_amd(4): Add knobs to get/set all fields of CPPC_REQUEST
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Authored by olce on Sat, Jan 31, 11:49 AM.
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Summary

This will allow experimentations and finer-grained tuning to the full
extent allowed by the hardware, which is especially important given that
the spec leaves to hardware implementors an important leeway in
interpreting CPPC's numeric parameters, causing the same settings to
have different effects on different CPU models.

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rG FreeBSD src repository
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Buildable 70282
Build 67165: arc lint + arc unit