arm64: Make L1_BLOCKS_SUPPORTED dynamic
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Authored by andrew on Aug 21 2024, 12:16 PM.

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Reviewers

alc
kib
markj
manu

Group Reviewers

arm64

Commits

rGd99e6b22c01f: arm64: Make L1_BLOCKS_SUPPORTED dynamic

Summary

When FEAT_LPA2 is implemented and the TCR_EL1.DS field is set we can
create blocks at level 1 with a 16kB page size. Add a variable to
tell the kernel this is enabled.

This will be used by other parts of pmap.c with a 4k page kernel so
make it visible there.

Diff Detail

Repository

rG FreeBSD src repository

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Event Timeline

andrew created this revision.Aug 21 2024, 12:16 PM

Herald added a reviewer: manu. · View Herald TranscriptAug 21 2024, 12:16 PM

Herald added subscribers: emaste, imp. · View Herald Transcript

andrew requested review of this revision.Aug 21 2024, 12:16 PM

andrew added a parent revision: D46394: arm64: Make shareability attributes dynamic.

Harbormaster completed remote builds in B59123: Diff 142301.Aug 21 2024, 12:16 PM

markj accepted this revision.Aug 22 2024, 3:32 PM

markj added inline comments.

sys/arm64/arm64/pmap.c
1693	Maybe `blocks_supported` would be a better name.

This revision is now accepted and ready to land.Aug 22 2024, 3:32 PM

kib added inline comments.Aug 22 2024, 6:55 PM

sys/arm64/arm64/pmap.c
369	Should both vars have __read_mostly annotation?

alc accepted this revision.Aug 23 2024, 5:10 AM

alc added inline comments.

sys/arm64/arm64/pmap.c
1693	I don't think that the `blocks_` prefix is necessary. The other counter under the same sysctl node is about blocks too. In general, any of these sysctl nodes not ending in c, e.g., `pmap.l1`, `pmap.l2`, are about block mappings.