arm64/cpufeature: Add explicit ftr_id_isar0[] for ID_ISAR0 register

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ID_ISAR0[31..28] bits are RES0 in ARMv8, Reserved/UNK in ARMv7. Currently
these bits get exposed through generic_id_ftr32[] which is not desirable.
Hence define an explicit ftr_id_isar0[] array for ID_ISAR0 register where
those bits can be hidden.

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org

Suggested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/1589881254-10082-2-git-send-email-anshuman.khandual@arm.com
Signed-off-by: Will Deacon <will@kernel.org>

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This commit is contained in:

Anshuman Khandual 2020-05-19 15:10:38 +05:30 • committed by Will Deacon

parent f73531f025

commit 2a5bc6c47b

2 changed files with 20 additions and 2 deletions

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8

arch/arm64/include/asm/sysreg.h

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14

arch/arm64/kernel/cpufeature.c

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