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s390: add support to start the kernel in 64 bit mode.
authorMartin Schwidefsky <schwidefsky@de.ibm.com>
Thu, 23 Aug 2012 14:18:09 +0000 (16:18 +0200)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Tue, 9 Oct 2012 12:16:58 +0000 (14:16 +0200)
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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