summaryrefslogtreecommitdiffstats
path: root/kernel/arch/m68k/coldfire/cache.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/arch/m68k/coldfire/cache.c')
-rw-r--r--kernel/arch/m68k/coldfire/cache.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/kernel/arch/m68k/coldfire/cache.c b/kernel/arch/m68k/coldfire/cache.c
new file mode 100644
index 000000000..71beeaf0c
--- /dev/null
+++ b/kernel/arch/m68k/coldfire/cache.c
@@ -0,0 +1,48 @@
+/***************************************************************************/
+
+/*
+ * cache.c -- general ColdFire Cache maintenance code
+ *
+ * Copyright (C) 2010, Greg Ungerer (gerg@snapgear.com)
+ */
+
+/***************************************************************************/
+
+#include <linux/kernel.h>
+#include <asm/coldfire.h>
+#include <asm/mcfsim.h>
+
+/***************************************************************************/
+#ifdef CACHE_PUSH
+/***************************************************************************/
+
+/*
+ * Use cpushl to push all dirty cache lines back to memory.
+ * Older versions of GAS don't seem to know how to generate the
+ * ColdFire cpushl instruction... Oh well, bit stuff it for now.
+ */
+
+void mcf_cache_push(void)
+{
+ __asm__ __volatile__ (
+ "clrl %%d0\n\t"
+ "1:\n\t"
+ "movel %%d0,%%a0\n\t"
+ "2:\n\t"
+ ".word 0xf468\n\t"
+ "addl %0,%%a0\n\t"
+ "cmpl %1,%%a0\n\t"
+ "blt 2b\n\t"
+ "addql #1,%%d0\n\t"
+ "cmpil %2,%%d0\n\t"
+ "bne 1b\n\t"
+ : /* No output */
+ : "i" (CACHE_LINE_SIZE),
+ "i" (DCACHE_SIZE / CACHE_WAYS),
+ "i" (CACHE_WAYS)
+ : "d0", "a0" );
+}
+
+/***************************************************************************/
+#endif /* CACHE_PUSH */
+/***************************************************************************/