s390/head: set io/ext handlers to disabled wait

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Set io/ext handlers to disabled wait in the initial lowcore, so that they
are effective right from the kernel start, when a boot method used does
not rewrite this part of the lowcore for its own needs (i.e. kexec, z/vm
ipl reader boot, qemu direct boot, load from removable media or server).

When the kernel is loaded by zipl, scsi loader or qemu loader, some or
all of the io/ext/pgm handlers addresses might be rewritten. Rewrite them
to initial values again as early as possible.

Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

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Vasily Gorbik 2020-10-13 16:19:37 +02:00 • committed by Heiko Carstens

parent f8394f232b

commit 13b5bd8af4

1 changed files with 13 additions and 1 deletions

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arch/s390/boot/head.S

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