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Differential D58535

arm64: Add BRBE support
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Authored by sarah.walker2_arm.com on Jul 29 2026, 3:37 PM.
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F168815678: D58535.id.diff
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F168786786: D58535.id183036.diff
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F168736960: D58535.diff
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Details

Reviewers
andrew
manu
Summary

Add support for the Arm Branch Record Buffer Extension (BRBE). This
is an optional extension added in Armv9.2 to provide control path
history sampling.

This adds the initial driver, and attaches it to the hardware tracing
framework, hwt(4). Both CPU and thread modes are implemented.

Sponsored by: Arm Ltd

Diff Detail

Repository
rG FreeBSD src repository
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Lint Skipped
Unit
Tests Skipped
Build Status
Buildable 75266
Build 72149: arc lint + arc unit

Revision Contents
Changeset List

PathSize
sys/
arm64/
brbe/
100 lines
565 lines
130 lines
292 lines
129 lines
conf/
2 lines
modules/
2 lines
brbe/
15 lines

Diff 183036

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sys/arm64/brbe/arm_brbe.h

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sys/arm64/brbe/arm_brbe_backend.c

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sys/arm64/brbe/arm_brbe_dev.h

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sys/arm64/brbe/arm_brbe_dev.c

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sys/arm64/brbe/arm_brbe_reg.h

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sys/conf/files.arm64

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sys/modules/Makefile

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sys/modules/brbe/Makefile

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