tree a6aba59c3fc6e2a76978686dc3453fc3980e8b24
parent d1028f1b5b4cf83e8af5f48996cf392fb12d391a
author Christian Borntraeger <borntraeger@de.ibm.com> 1392155213 +0100
committer Christian Borntraeger <borntraeger@de.ibm.com> 1393491086 +0100

s390-ccw.img: Fix sporadic errors with ccw boot image - initialize css

We have to set the cssid to 0, otherwise the stsch code will
return an operand exception without the m bit. In the same way
we should set m=0.

This case was triggered in some cases during reboot, if for some
reason the location of blk_schid.cssid contains 1 and m was 0.
Turns out that the qemu elf loader does not zero out the bss section
on reboot.

The symptom was an dump of the old kernel with several areas
overwritten. The bootloader does not register a program check
handler, so bios exception jumped back into the old kernel.

Lets just use a local struct with a designed initializer. That
will guarantee that all other subelements are initialized to 0.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>