arm: Use the Self-Synchronized counter registers
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Authored by andrew on Fri, Aug 8, 12:21 PM.

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Summary

When FEAT_ECV is implemented on arm64 a Self-Synchronized view of the
counter registers are available. These don't need an isb before reading
the count as they are not able to be speculatively executed.

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Repository

rG FreeBSD src repository

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Build Status

Buildable 66100
Build 62983: arc lint + arc unit

Event Timeline

andrew created this revision.Fri, Aug 8, 12:21 PM

Herald added a subscriber: imp. · View Herald TranscriptFri, Aug 8, 12:21 PM

andrew requested review of this revision.Fri, Aug 8, 12:21 PM

Harbormaster completed remote builds in B66100: Diff 160047.Fri, Aug 8, 12:21 PM

andrew added a parent revision: D51819: arm64: Add more counter/timer registers.Fri, Aug 8, 12:21 PM

andrew added a child revision: D51821: arm64/vmm: Use FEAT_ECV_POFF to support a timer.

Revision Contents
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sys/

arm/

generic_timer.c

25 lines

Diff 160047

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sys/arm/arm/generic_timer.c

arm: Use the Self-Synchronized counter registersNeeds ReviewPublicActions