arm64: disable the EL2 MMU in early boot
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Authored by kevans on Mar 23 2022, 3:20 PM.

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andrew
manu

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arm64

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rG51adf913e881: arm64: disable the EL2 MMU before dropping to EL1

Summary

An earlier stage may have set HCR_EL2.E2H, the clearing of which may
break address translation. We don't need the EL2 MMU at this point, so
we can avoid re-enabling it for now and just drop to EL1 as usual.

Author: andrew
Tested by: kevans

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rG FreeBSD src repository

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kevans created this revision.Mar 23 2022, 3:20 PM

Herald added a reviewer: manu. · View Herald TranscriptMar 23 2022, 3:20 PM

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

kevans requested review of this revision.Mar 23 2022, 3:20 PM

Harbormaster completed remote builds in B44864: Diff 104114.Mar 23 2022, 3:21 PM

andrew accepted this revision.Mar 23 2022, 3:29 PM

This revision is now accepted and ready to land.Mar 23 2022, 3:29 PM

Closed by commit rG51adf913e881: arm64: disable the EL2 MMU before dropping to EL1 (authored by kevans). · Explain WhyMay 13 2022, 3:08 AM

This revision was automatically updated to reflect the committed changes.

kevans added a commit: rG51adf913e881: arm64: disable the EL2 MMU before dropping to EL1.

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sys/

arm64/

locore.S

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arm64: disable the EL2 MMU in early bootClosedPublicActions