[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, 26 insertions, 7 deletions

diff --git a/arch/s390/kernel/reipl.S b/arch/s390/kernel/reipl.S
index 658e5ac484f9..4562cdbce8eb 100644
--- a/arch/s390/kernel/reipl.S
+++ b/arch/s390/kernel/reipl.S
@@ -8,13 +8,30 @@
 
 #include <asm/lowcore.h>
 
-                .globl  do_reipl
-do_reipl:       basr    %r13,0
+                .globl  do_reipl_asm
+do_reipl_asm:   basr    %r13,0
 .Lpg0:          lpsw    .Lnewpsw-.Lpg0(%r13)
-.Lpg1:          lctl    %c6,%c6,.Lall-.Lpg0(%r13)
-                stctl   %c0,%c0,.Lctlsave-.Lpg0(%r13)
-                ni      .Lctlsave-.Lpg0(%r13),0xef
-                lctl    %c0,%c0,.Lctlsave-.Lpg0(%r13)
+
+                # switch off lowcore protection
+
+.Lpg1:          stctl   %c0,%c0,.Lctlsave1-.Lpg0(%r13)
+                stctl   %c0,%c0,.Lctlsave2-.Lpg0(%r13)
+                ni      .Lctlsave1-.Lpg0(%r13),0xef
+                lctl    %c0,%c0,.Lctlsave1-.Lpg0(%r13)
+
+                # do store status of all registers
+
+                stm     %r0,%r15,__LC_GPREGS_SAVE_AREA
+                stctl   %c0,%c15,__LC_CREGS_SAVE_AREA
+                mvc     __LC_CREGS_SAVE_AREA(4),.Lctlsave2-.Lpg0(%r13)
+                stam    %a0,%a15,__LC_AREGS_SAVE_AREA
+                stpx    __LC_PREFIX_SAVE_AREA
+                stckc   .Lclkcmp-.Lpg0(%r13)
+                mvc     __LC_CLOCK_COMP_SAVE_AREA(8),.Lclkcmp-.Lpg0(%r13)
+                stpt    __LC_CPU_TIMER_SAVE_AREA
+                st      %r13, __LC_PSW_SAVE_AREA+4
+
+                lctl    %c6,%c6,.Lall-.Lpg0(%r13)
                 lr      %r1,%r2
                 mvc     __LC_PGM_NEW_PSW(8),.Lpcnew-.Lpg0(%r13)
                 stsch   .Lschib-.Lpg0(%r13)                                    
@@ -46,9 +63,11 @@ do_reipl:	basr	%r13,0
 .Ldisab:        st      %r14,.Ldispsw+4-.Lpg0(%r13)
                 lpsw    .Ldispsw-.Lpg0(%r13)
                 .align  8
+.Lclkcmp:       .quad   0x0000000000000000
 .Lall:          .long   0xff000000
 .Lnull:         .long   0x00000000
-.Lctlsave:      .long   0x00000000
+.Lctlsave1:     .long   0x00000000
+.Lctlsave2:     .long   0x00000000
                 .align  8
 .Lnewpsw:       .long   0x00080000,0x80000000+.Lpg1
 .Lpcnew:        .long   0x00080000,0x80000000+.Lecs