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Differential D33583

Start the arm64 pmap_pte at level 0
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Authored by andrew on Dec 20 2021, 10:10 AM.
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emaste
imp

Details

Reviewers
alc
kib
markj
manu
Group Reviewers
arm64
Summary

Return early when the level 0 page table is invalid. This will allows
us to skip over the entire memory range when walking the page tables.

Diff Detail

Repository
rS FreeBSD src repository - subversion
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Lint Passed
Unit
No Test Coverage
Build Status
Buildable 43496
Build 40384: arc lint + arc unit

Event Timeline

andrew created this revision.Dec 20 2021, 10:10 AM
Herald added a reviewer: manu. · View Herald TranscriptDec 20 2021, 10:10 AM
Herald added subscribers: emaste, imp. · View Herald Transcript
Harbormaster completed remote builds in B43496: Diff 100335.Dec 20 2021, 10:10 AM
andrew requested review of this revision.Dec 20 2021, 10:10 AM
andrew mentioned this in D33459: Don't fail changing props for unmapped DMAP memory.
alc added a comment.Dec 20 2021, 5:46 PM

I'm confused. I don't see how this change makes any functional difference. The original code set *level == 0 and returned NULL when the L0 entry was not L0_TABLE, and only under those circumstances.

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Changeset List

PathSize
sys/
arm64/
arm64/
9 lines

Diff 100335

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sys/arm64/arm64/pmap.c

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