[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/head31.S b/arch/s390/kernel/head31.S
index 0e46077d714..d8bb68a7252 100644
--- a/arch/s390/kernel/head31.S
+++ b/arch/s390/kernel/head31.S
@@ -38,6 +38,7 @@ startup:basr	%r13,0			# get base
 startup_continue:
         basr    %r13,0                  # get base
 .LPG1:  GET_IPL_DEVICE
+        mvi     __LC_AR_MODE_ID,0       # set ESA flag (mode 0)
         lctl    %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
         l       %r12,.Lparmaddr-.LPG1(%r13) # pointer to parameter area
                                         # move IPL device to lowcore
@@ -274,6 +275,8 @@ startup_continue:
 .Lparmaddr: .long PARMAREA
 .Lsccbaddr: .long .Lsccb
         .org    0x12000
+.globl s390_readinfo_sccb
+s390_readinfo_sccb:
 .Lsccb:
         .hword  0x1000                  # length, one page
         .byte   0x00,0x00,0x00