arm64: enforce x1|x2|x3 == 0 upon kernel entry as per boot protocol

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According to the arm64 boot protocol, registers x1 to x3 should be
zero upon kernel entry, and non-zero values are reserved for future
use. This future use is going to be problematic if we never enforce
the current rules, so start enforcing them now, by emitting a warning
if non-zero values are detected.

Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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Ard Biesheuvel 2015-03-17 10:55:12 +01:00 • committed by Will Deacon

parent 6f4d57fa70

commit da9c177de8

2 changed files with 29 additions and 1 deletions

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19

arch/arm64/kernel/head.S

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11

arch/arm64/kernel/setup.c

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