arm64: Use a bit to hold userspace ID reg exports
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Authored by andrew on Oct 15 2024, 2:01 PM.

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Reviewers

manu
imp

Group Reviewers

arm64

Commits

rGf03149940554: arm64: Use a bit to hold userspace ID reg exports

Summary

When exporting ID registers to userspace we should either adjust them
the same way for FreeBSD and Linux binaries, or export the Linux
field values to a safe value, e.g. when a needed syscall is missing.

To allow for this, and to clean up ID register handling in the kernel
move to using a bit per userspace ABI.

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Repository

rG FreeBSD src repository

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Build Status

Buildable 60001
Build 56886: arc lint + arc unit

Event Timeline

andrew created this revision.Oct 15 2024, 2:01 PM

Herald added a reviewer: manu. · View Herald TranscriptOct 15 2024, 2:01 PM

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

andrew requested review of this revision.Oct 15 2024, 2:01 PM

Harbormaster completed remote builds in B60001: Diff 144906.Oct 15 2024, 2:01 PM

andrew added a parent revision: D47120: arm64: Add MRS_SAFE to hold a safe ID field value.Oct 15 2024, 2:01 PM

andrew added a child revision: D47122: arm64: Support more ID register field types.

I didn't check, though, that all tge bits were tagged right.

This revision is now accepted and ready to land.Oct 15 2024, 2:18 PM

Closed by commit rGf03149940554: arm64: Use a bit to hold userspace ID reg exports (authored by andrew). · Explain WhyOct 21 2024, 12:24 PM

This revision was automatically updated to reflect the committed changes.

andrew added a commit: rGf03149940554: arm64: Use a bit to hold userspace ID reg exports.

Revision Contents
Changeset List

Path

Size

sys/

arm64/

identcpu.c

438 lines

Diff 144906

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sys/arm64/arm64/identcpu.c

arm64: Use a bit to hold userspace ID reg exportsClosedPublicActions