This patch fixes I-cache invalidation operation for M32102 chip,
which is one of m32r MMU-less targets.
Before this fix, the m32r kernel for M32102 chip missed I-cache
invalidation operation and switched off I-cache unintentionally.
This bug caused awful performance degradation.
Signed-off-by: Mamoru Sakugawa <[email protected]>
Signed-off-by: Hirokazu Takata <[email protected]>
---
diff -ruNp a/arch/m32r/mm/cache.c b/arch/m32r/mm/cache.c
--- a/arch/m32r/mm/cache.c 2004-12-25 06:35:50.000000000 +0900
+++ b/arch/m32r/mm/cache.c 2005-03-10 21:43:07.708321535 +0900
@@ -4,8 +4,6 @@
* Copyright (C) 2002 Hirokazu Takata
*/
-/* $Id$ */
-
#include <linux/config.h>
#include <asm/pgtable.h>
@@ -25,8 +23,8 @@
#define MCCR_DCACHE_CBINV (MCCR_CC|MCCR_DIV|MCCR_DCB)
#define CHECK_MCCR(mccr) (mccr = *MCCR)
#elif defined(CONFIG_CHIP_M32102)
-#define MCCR ((volatile unsigned long*)0xfffffffc)
-#define MCCR_IIV (1UL << 8) /* I-cache invalidate */
+#define MCCR ((volatile unsigned char*)0xfffffffe)
+#define MCCR_IIV (1UL << 0) /* I-cache invalidate */
#define MCCR_ICACHE_INV MCCR_IIV
#endif /* CONFIG_CHIP_XNUX2 || CONFIG_CHIP_M32700 */
@@ -65,4 +63,3 @@ void _flush_cache_copyback_all(void)
#endif
}
-
--
Hirokazu Takata <[email protected]>
Linux/M32R Project: http://www.linux-m32r.org/
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