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[v3,5/5] pc-bios: s390x: Go into disabled wait when encountering a PGM exception

Message ID 20200831150910.317171-6-frankja@linux.ibm.com
State New
Headers show
Series pc-bios: s390x: Cleanup part 2 | expand

Commit Message

Janosch Frank Aug. 31, 2020, 3:09 p.m. UTC 
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>
---
 pc-bios/s390-ccw/start.S | 3 +++
 1 file changed, 3 insertions(+)

Comments

Thomas Huth Sept. 1, 2020, 5:24 p.m. UTC | #1 
On 31/08/2020 17.09, Janosch Frank wrote:
> 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>
> ---
>  pc-bios/s390-ccw/start.S | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/pc-bios/s390-ccw/start.S b/pc-bios/s390-ccw/start.S
> index 939aac3a7c..775b45baeb 100644
> --- a/pc-bios/s390-ccw/start.S
> +++ b/pc-bios/s390-ccw/start.S
> @@ -44,6 +44,9 @@ done:
>          larl  %r2, external_new_psw
>          stg   %r1, 8(%r2)
>          mvc   0x1b0(16),0(%r2)
> +        /* set up a pgm exception disabled wait psw */
> +        larl  %r2, disabled_wait_psw
> +        mvc   0x01d0(16), 0(%r2)
>          j      main		/* And call C */
>  
>  memsetxc:
> 

Sounds like a good idea.

Reviewed-by: Thomas Huth <thuth@redhat.com>
diff mbox series

Patch

diff --git a/pc-bios/s390-ccw/start.S b/pc-bios/s390-ccw/start.S
index 939aac3a7c..775b45baeb 100644
--- a/pc-bios/s390-ccw/start.S
+++ b/pc-bios/s390-ccw/start.S
@@ -44,6 +44,9 @@  done:
         larl  %r2, external_new_psw
         stg   %r1, 8(%r2)
         mvc   0x1b0(16),0(%r2)
+        /* set up a pgm exception disabled wait psw */
+        larl  %r2, disabled_wait_psw
+        mvc   0x01d0(16), 0(%r2)
         j      main		/* And call C */
 
 memsetxc: