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arm64 pmap: Convert PC_IS_FREE into an inline function.
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Authored by jhb on Aug 16 2022, 5:15 PM.

Details

Summary

This permits inlining the comparisons even in the 16K page case.
Note that since PC_FREEN is -1, values can be compared efficiently
without having to fetch words of pc_freemask from memory via the
'cmn <reg>, #0x1' instruction.

Sponsored by: DARPA

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rG FreeBSD src repository
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Event Timeline

jhb requested review of this revision.Aug 16 2022, 5:15 PM
markj added inline comments.
sys/arm64/arm64/pmap.c
2473

Is pc_freemask unused?

This revision is now accepted and ready to land.Aug 16 2022, 6:14 PM
sys/arm64/arm64/pmap.c
2473

No, we still use it to initialize the mask in new chunks via memcpy.