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Differential D55960

arm64: mte: cpu feature detection for FEAT_MTE/FEAT_MTE2
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Authored by andrew on Mar 19 2026, 4:07 PM.
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Reviewers
manu
Group Reviewers
arm64
Summary

Using the CPU feature detection framework, add a CPU_FEAT_EARLY_BOOT
check for the Memory Tagging Extension, and a HWCAP for FEAT_MTE.

Like Pointer Authentication (sys/arm64/arm64/ptrauth.c), MTE logic will
be kept within it's own file. In order to use the MTE registers and
instructions, this file needs the "-march=armv8.5+memtag" compiler flag.

Sponsored by: Arm Ltd
Signed-off-by: Harry Moulton <harry.moulton@arm.com>
Co-authored-by: Andrew Turner <andrew@FreeBSD.org>

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Repository
rG FreeBSD src repository
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Build Status
Buildable 71541
Build 68424: arc lint + arc unit

Revision Contents
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PathSize
sys/
arm64/
arm64/
8 lines
3 lines
45 lines

Diff 173930

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sys/arm64/arm64/identcpu.c

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sys/arm64/arm64/locore.S

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sys/arm64/arm64/mte.c

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