[S390] ipl/dump on panic.

It is now possible to specify a ccw/fcp dump device which is used to
automatically create a system dump in case of a kernel panic. The dump
device can be configured under /sys/firmware/dump.
In addition it is now possible to specify a ccw/fcp device which is used
for the next reboot of Linux. The reipl device can be configured under
/sys/firmware/reipl.

Signed-off-by: Michael Holzheu <holzheu@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S
index 3e0341acd04e..c2005101fee1 100644
--- a/arch/s390/kernel/head64.S
+++ b/arch/s390/kernel/head64.S
@@ -41,6 +41,7 @@ startup_continue:
         srl   %r13,1
         GET_IPL_DEVICE
         lhi   %r1,1                      # mode 1 = esame
+        mvi   __LC_AR_MODE_ID,1          # set esame flag
         slr   %r0,%r0                    # set cpuid to zero
         sigp  %r1,%r0,0x12               # switch to esame mode
         sam64                            # switch to 64 bit mode
@@ -269,6 +270,8 @@ startup_continue:
         .quad   PARMAREA
 
         .org    0x12000
+.globl s390_readinfo_sccb
+s390_readinfo_sccb:
 .Lsccb:
         .hword 0x1000                   # length, one page
         .byte 0x00,0x00,0x00