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[PULL,14/16] pc-bios: s390x: Go into disabled wait when encountering a PGM exception

Message ID 20201006183122.155609-15-thuth@redhat.com
State New
Headers show
Series s390-ccw bios update | expand

Commit Message

Thomas Huth Oct. 6, 2020, 6:31 p.m. UTC 
From: Janosch Frank <frankja@linux.ibm.com>

Let's setup a PGM PSW, so we won't load 0s when a program exception
happens. Instead we'll load a disabled wait PSW.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20201006094249.50640-5-frankja@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 pc-bios/s390-ccw/start.S | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
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Patch

diff --git a/pc-bios/s390-ccw/start.S b/pc-bios/s390-ccw/start.S
index ce519300a1..4d5ad21653 100644
--- a/pc-bios/s390-ccw/start.S
+++ b/pc-bios/s390-ccw/start.S
@@ -34,7 +34,10 @@  remainder:
 	larl	%r2,memsetxc
 	ex	%r3,0(%r2)
 done:
-	j      main		/* And call C */
+        /* set up a pgm exception disabled wait psw */
+        larl	%r2, disabled_wait_psw
+        mvc	0x01d0(16), 0(%r2)
+        j      main		/* And call C */
 
 memsetxc:
 	xc	0(1,%r1),0(%r1)