MN10300: Create general kernel debugger cache flushing
Create general kernel debugger cache flushing for MN10300 and get rid of the
old stuff that gdbstub was using.
Signed-off-by: David Howells <dhowells@redhat.com>
diff --git a/arch/mn10300/mm/cache-dbg-inv-by-reg.S b/arch/mn10300/mm/cache-dbg-inv-by-reg.S
new file mode 100644
index 0000000..c4e6252
--- /dev/null
+++ b/arch/mn10300/mm/cache-dbg-inv-by-reg.S
@@ -0,0 +1,69 @@
+/* MN10300 CPU cache invalidation routines, using automatic purge registers
+ *
+ * Copyright (C) 2011 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#include <linux/sys.h>
+#include <linux/linkage.h>
+#include <asm/cache.h>
+#include <asm/irqflags.h>
+#include <asm/cacheflush.h>
+#include "cache.inc"
+
+ .am33_2
+
+ .globl debugger_local_cache_flushinv_one
+
+###############################################################################
+#
+# void debugger_local_cache_flushinv_one(u8 *addr)
+#
+# Invalidate one particular cacheline if it's in the icache
+#
+###############################################################################
+ ALIGN
+ .globl debugger_local_cache_flushinv_one
+ .type debugger_local_cache_flushinv_one,@function
+debugger_local_cache_flushinv_one:
+ mov d0,a1
+
+ mov CHCTR,a0
+ movhu (a0),d0
+ btst CHCTR_ICEN,d0
+ beq mn10300_local_icache_inv_range_reg_end
+
+ LOCAL_CLI_SAVE(d1)
+
+ mov ICIVCR,a0
+
+ # wait for the invalidator to quiesce
+ setlb
+ mov (a0),d0
+ btst ICIVCR_ICIVBSY,d0
+ lne
+
+ # set the mask
+ mov ~L1_CACHE_TAG_MASK,d0
+ mov d0,(ICIVMR)
+
+ # invalidate the cache line at the given address
+ and ~L1_CACHE_TAG_MASK,a1
+ or ICIVCR_ICI,a1
+ mov a1,(a0)
+
+ # wait for the invalidator to quiesce again
+ setlb
+ mov (a0),d0
+ btst ICIVCR_ICIVBSY,d0
+ lne
+
+ LOCAL_IRQ_RESTORE(d1)
+
+mn10300_local_icache_inv_range_reg_end:
+ ret [],0
+ .size debugger_local_cache_flushinv_one,.-debugger_local_cache_flushinv_one