From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Date: Tue, 17 Mar 2015 09:55:12 +0000 (+0100)
Subject: arm64: enforce x1|x2|x3 == 0 upon kernel entry as per boot protocol
X-Git-Tag: omap-for-v4.2/o2_dc~115^2~17
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=da9c177de88679c2948dc9a5e2325b0dff4677b9;p=pandora-kernel.git

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

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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