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

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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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This commit is contained in:

Martin Schwidefsky 2012-08-23 16:18:09 +02:00

parent cc5b9a4518

commit 51eee033dc

1 changed files with 70 additions and 31 deletions

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arch/s390/kernel/head.S

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