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authorPaul Mundt <lethal@linux-sh.org>2009-12-04 16:22:11 +0900
committerPaul Mundt <lethal@linux-sh.org>2009-12-04 16:22:11 +0900
commit6e8a0d11a088ed51b1b649d3a1127a7bda3700a0 (patch)
treeccf75bf36c8dd5c5f0dce18be8f5cb8c9ad59079 /arch
parenta781d1e5ff6277f80ff3c9503775521bc64cf131 (diff)
downloadop-kernel-dev-6e8a0d11a088ed51b1b649d3a1127a7bda3700a0.zip
op-kernel-dev-6e8a0d11a088ed51b1b649d3a1127a7bda3700a0.tar.gz
sh: Make associative cache writes fatal on all SH-4A parts.
Now that associative cache writes are no longer needed by the SH-4/SH-4A cache flush code, associative write support can be explicitly disabled for all SH-4A parts. This makes any associative write throw an exception, as this behaviour can not be assumed to exist on future parts. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/sh/kernel/cpu/init.c13
1 files changed, 4 insertions, 9 deletions
diff --git a/arch/sh/kernel/cpu/init.c b/arch/sh/kernel/cpu/init.c
index ad9dfff..89b4b76 100644
--- a/arch/sh/kernel/cpu/init.c
+++ b/arch/sh/kernel/cpu/init.c
@@ -75,16 +75,11 @@ static void __init expmask_init(void)
/*
* Future proofing.
*
- * Disable support for slottable sleep instruction
- * and non-nop instructions in the rte delay slot.
+ * Disable support for slottable sleep instruction, non-nop
+ * instructions in the rte delay slot, and associative writes to
+ * the memory-mapped cache array.
*/
- expmask &= ~(EXPMASK_RTEDS | EXPMASK_BRDSSLP);
-
- /*
- * Enable associative writes to the memory-mapped cache array
- * until the cache flush ops have been rewritten.
- */
- expmask |= EXPMASK_MMCAW;
+ expmask &= ~(EXPMASK_RTEDS | EXPMASK_BRDSSLP | EXPMASK_MMCAW);
__raw_writel(expmask, EXPMASK);
ctrl_barrier();
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