tree 66a73474911ffafac83a666f89735ec0efd2714b
parent 554f80896dbdc6ce5bb01eab9659facf05ccf168
author Christian Borntraeger <borntraeger@de.ibm.com> 1403093805 +0200
committer Cornelia Huck <cornelia.huck@de.ibm.com> 1403525011 +0200

pc-bios/s390-ccw: do a subsystem reset before running the guest

The loader BIOS has already activated several devices. Let's do a
subsystem reset before jumping into the guest. As there is no direct
way of doing so, we use diagnose 308 to bring the system in a
defined state. This is similar to what kdump on s390 uses. We have
to define a small trampoline function that restores the low bytes
to whatever the bootmap has written there.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Reviewed-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>