[S390] reipl: move dump_prefix_page out of text section.

Reipl doesn't work on older machines were s390_reset_machine() gets
called. The reason is that the text section is read-only but the
variable dump_prefix_page is there. Since s390_reset_machine() writes
to it we get a protection exception.
Therefore move dump_prefix_page to the bss section.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 7 insertions, 6 deletions

diff --git a/arch/s390/kernel/reipl.S b/arch/s390/kernel/reipl.S
index c3f4d9b95083..2f481cc3d1c9 100644
--- a/arch/s390/kernel/reipl.S
+++ b/arch/s390/kernel/reipl.S
@@ -8,6 +8,10 @@
 
 #include <asm/lowcore.h>
 
+#
+# do_reipl_asm
+# Parameter: r2 = schid of reipl device
+#
                 .globl  do_reipl_asm
 do_reipl_asm:   basr    %r13,0
 .Lpg0:          lpsw    .Lnewpsw-.Lpg0(%r13)
@@ -16,12 +20,12 @@ do_reipl_asm:	basr	%r13,0
                 stm     %r0,%r15,__LC_GPREGS_SAVE_AREA
                 stctl   %c0,%c15,__LC_CREGS_SAVE_AREA
                 stam    %a0,%a15,__LC_AREGS_SAVE_AREA
-                mvc     __LC_PREFIX_SAVE_AREA(4),dump_prefix_page-.Lpg0(%r13)
+                l       %r10,.Ldump_pfx-.Lpg0(%r13)
+                mvc     __LC_PREFIX_SAVE_AREA(4),0(%r10)
                 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)
@@ -55,6 +59,7 @@ do_reipl_asm:	basr	%r13,0
                 .align  8
 .Lclkcmp:       .quad   0x0000000000000000
 .Lall:          .long   0xff000000
+.Ldump_pfx:     .long   dump_prefix_page
                 .align  8
 .Lnewpsw:       .long   0x00080000,0x80000000+.Lpg1
 .Lpcnew:        .long   0x00080000,0x80000000+.Lecs
@@ -79,7 +84,3 @@ do_reipl_asm:	basr	%r13,0
                 .long   0x00000000,0x00000000
                 .long   0x00000000,0x00000000
                 .long   0x00000000,0x00000000
-        .globl dump_prefix_page
-dump_prefix_page:
-        .long 0x00000000
-