arm64: Detect the ARMv8.4 TTL feature

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In order to reduce the cost of TLB invalidation, the ARMv8.4 TTL
feature allows TLBs to be issued with a level allowing for quicker
invalidation.

Let's detect the feature for now. Further patches will implement
its actual usage.

Reviewed-by : Suzuki K Polose <suzuki.poulose@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>

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This commit is contained in:

Marc Zyngier 2018-12-22 12:00:10 +00:00

parent 9ebcfadb06

commit 552ae76fac

3 changed files with 14 additions and 1 deletions

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3

arch/arm64/include/asm/cpucaps.h

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1

arch/arm64/include/asm/sysreg.h

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11

arch/arm64/kernel/cpufeature.c

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