From: Martin Schwidefsky <schwidefsky@de.ibm.com>
Date: Thu, 23 Aug 2012 14:18:09 +0000 (+0200)
Subject: s390: add support to start the kernel in 64 bit mode.
X-Git-Tag: v3.7-rc1~62^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=51eee033dca3d6dc81febc5a69f30b964f3bddf3;p=pandora-kernel.git

s390: add support to start the kernel in 64 bit mode.

Do the switch to z/Architecture (alias 64 bit) mode early in head.S.
If the machine is already running in 64 bit mode the sigp turns into
a nop. With this change it doesn't matter in which mode the kernel
is started.

Reviewd-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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