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Date: Mon, 5 Mar 2007 23:39:55 +0100
From: Martin Schwidefsky <schwidefsky@...ibm.com>
To: linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Cc: heiko.carstens@...ibm.com
Subject: [S390] reipl: move dump_prefix_page out of text section.
From: Heiko Carstens <heiko.carstens@...ibm.com>
[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@...ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com>
---
arch/s390/kernel/ipl.c | 4 ++--
arch/s390/kernel/reipl.S | 13 +++++++------
arch/s390/kernel/reipl64.S | 13 +++++++++----
include/asm-s390/ipl.h | 1 +
4 files changed, 19 insertions(+), 12 deletions(-)
diff -urpN linux-2.6/arch/s390/kernel/ipl.c linux-2.6-patched/arch/s390/kernel/ipl.c
--- linux-2.6/arch/s390/kernel/ipl.c 2007-03-05 22:51:29.000000000 +0100
+++ linux-2.6-patched/arch/s390/kernel/ipl.c 2007-03-05 22:51:49.000000000 +0100
@@ -1066,7 +1066,7 @@ static void do_reset_calls(void)
reset->fn();
}
-extern __u32 dump_prefix_page;
+u32 dump_prefix_page;
void s390_reset_system(void)
{
@@ -1078,7 +1078,7 @@ void s390_reset_system(void)
lc->panic_stack = S390_lowcore.panic_stack;
/* Save prefix page address for dump case */
- dump_prefix_page = (unsigned long) lc;
+ dump_prefix_page = (u32)(unsigned long) lc;
/* Disable prefixing */
set_prefix(0);
diff -urpN linux-2.6/arch/s390/kernel/reipl64.S linux-2.6-patched/arch/s390/kernel/reipl64.S
--- linux-2.6/arch/s390/kernel/reipl64.S 2007-02-04 19:44:54.000000000 +0100
+++ linux-2.6-patched/arch/s390/kernel/reipl64.S 2007-03-05 22:51:49.000000000 +0100
@@ -8,6 +8,12 @@
*/
#include <asm/lowcore.h>
+
+#
+# do_reipl_asm
+# Parameter: r2 = schid of reipl device
+#
+
.globl do_reipl_asm
do_reipl_asm: basr %r13,0
.Lpg0: lpswe .Lnewpsw-.Lpg0(%r13)
@@ -20,7 +26,8 @@ do_reipl_asm: basr %r13,0
stg %r0,__LC_GPREGS_SAVE_AREA-0x1000+8(%r1)
stctg %c0,%c15,__LC_CREGS_SAVE_AREA-0x1000(%r1)
stam %a0,%a15,__LC_AREGS_SAVE_AREA-0x1000(%r1)
- mvc __LC_PREFIX_SAVE_AREA-0x1000(4,%r1),dump_prefix_page-.Lpg0(%r13)
+ lg %r10,.Ldump_pfx-.Lpg0(%r13)
+ mvc __LC_PREFIX_SAVE_AREA-0x1000(4,%r1),0(%r10)
stfpc __LC_FP_CREG_SAVE_AREA-0x1000(%r1)
stckc .Lclkcmp-.Lpg0(%r13)
mvc __LC_CLOCK_COMP_SAVE_AREA-0x1000(8,%r1),.Lclkcmp-.Lpg0(%r13)
@@ -64,6 +71,7 @@ do_reipl_asm: basr %r13,0
.align 8
.Lclkcmp: .quad 0x0000000000000000
.Lall: .quad 0x00000000ff000000
+.Ldump_pfx: .quad dump_prefix_page
.Lregsave: .quad 0x0000000000000000
.align 16
/*
@@ -103,6 +111,3 @@ do_reipl_asm: basr %r13,0
.long 0x00000000,0x00000000
.long 0x00000000,0x00000000
.long 0x00000000,0x00000000
- .globl dump_prefix_page
-dump_prefix_page:
- .long 0x00000000
diff -urpN linux-2.6/arch/s390/kernel/reipl.S linux-2.6-patched/arch/s390/kernel/reipl.S
--- linux-2.6/arch/s390/kernel/reipl.S 2007-02-04 19:44:54.000000000 +0100
+++ linux-2.6-patched/arch/s390/kernel/reipl.S 2007-03-05 22:51:49.000000000 +0100
@@ -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
-
diff -urpN linux-2.6/include/asm-s390/ipl.h linux-2.6-patched/include/asm-s390/ipl.h
--- linux-2.6/include/asm-s390/ipl.h 2007-03-05 22:51:39.000000000 +0100
+++ linux-2.6-patched/include/asm-s390/ipl.h 2007-03-05 22:51:49.000000000 +0100
@@ -74,6 +74,7 @@ struct ipl_parameter_block {
extern u32 ipl_flags;
extern u16 ipl_devno;
+extern u32 dump_prefix_page;
extern void do_reipl(void);
extern void ipl_save_parameters(void);
-
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