arm64/cpufeature: Introduce ID_DFR1 CPU register

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This adds basic building blocks required for ID_DFR1 CPU register which
provides top level information about the debug system in AArch32 state.
We hide the register from KVM guests, as we don't emulate the 'MTPMU'
feature.

This is added per ARM DDI 0487F.a specification.

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: kvmarm@lists.cs.columbia.edu
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org

Suggested-by: Will Deacon <will@kernel.org>
Reviewed-by : Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Link: https://lore.kernel.org/r/1589881254-10082-6-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Will Deacon <will@kernel.org>

...

This commit is contained in:

Anshuman Khandual 2020-05-19 15:10:42 +05:30 • committed by Will Deacon

parent 16824085a7

commit dd35ec0704

5 changed files with 16 additions and 1 deletions

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1

arch/arm64/include/asm/cpu.h

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3

arch/arm64/include/asm/sysreg.h

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arch/arm64/kernel/cpufeature.c

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arch/arm64/kernel/cpuinfo.c

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arch/arm64/kvm/sys_regs.c

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