arm64: arch_timer: Add workaround for ARM erratum 1188873

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When running on Cortex-A76, a timer access from an AArch32 EL0
task may end up with a corrupted value or register. The workaround for
this is to trap these accesses at EL1/EL2 and execute them there.

This only affects versions r0p0, r1p0 and r2p0 of the CPU.

Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

...

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Marc Zyngier 2018-09-27 17:15:34 +01:00 • committed by Catalin Marinas

parent 32a3e635fb

commit 95b861a4a6

5 changed files with 39 additions and 1 deletions

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12

arch/arm64/Kconfig

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3

arch/arm64/include/asm/cpucaps.h

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2

arch/arm64/include/asm/cputype.h

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8

arch/arm64/kernel/cpu_errata.c

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15

drivers/clocksource/arm_arch_timer.c

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