[src/trunk]: src/sys/arch/powerpc/oea When trying to write into page 0, use v...

[joerg <joerg%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/f6bda732d399
branches:  trunk
changeset: 787817:f6bda732d399
user:      joerg <joerg%NetBSD.org@localhost>
date:      Thu Jul 04 22:59:27 2013 +0000

description:
When trying to write into page 0, use volatile to force the compiler to
actually create this access.

diffstat:

 sys/arch/powerpc/oea/oea_machdep.c |  8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)

diffs (29 lines):

diff -r 477d3bb928a4 -r f6bda732d399 sys/arch/powerpc/oea/oea_machdep.c
--- a/sys/arch/powerpc/oea/oea_machdep.c        Thu Jul 04 22:29:29 2013 +0000
+++ b/sys/arch/powerpc/oea/oea_machdep.c        Thu Jul 04 22:59:27 2013 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: oea_machdep.c,v 1.64 2012/02/16 07:59:46 matt Exp $    */
+/*     $NetBSD: oea_machdep.c,v 1.65 2013/07/04 22:59:27 joerg Exp $   */
 
 /*
  * Copyright (C) 2002 Matt Thomas
@@ -33,7 +33,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: oea_machdep.c,v 1.64 2012/02/16 07:59:46 matt Exp $");
+__KERNEL_RCSID(0, "$NetBSD: oea_machdep.c,v 1.65 2013/07/04 22:59:27 joerg Exp $");
 
 #include "opt_ppcarch.h"
 #include "opt_compat_netbsd.h"
@@ -280,8 +280,8 @@
         * Install a branch absolute to trap0 to force a panic.
         */
        if ((uintptr_t)trap0 < 0x2000000) {
-               *(uint32_t *) 0 = 0x7c6802a6;
-               *(uint32_t *) 4 = 0x48000002 | (uintptr_t) trap0;
+               *(volatile uint32_t *) 0 = 0x7c6802a6;
+               *(volatile uint32_t *) 4 = 0x48000002 | (uintptr_t) trap0;
        }
 
        /*