patch-2.4.10 linux/arch/sh/mm/__clear_user_page-sh4.S

• Lines: 50
• Date: Sat Sep 8 12:29:09 2001
• Orig file: v2.4.9/linux/arch/sh/mm/__clear_user_page-sh4.S
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.9/linux/arch/sh/mm/__clear_user_page-sh4.S linux/arch/sh/mm/__clear_user_page-sh4.S
@@ -0,0 +1,49 @@
+/* $Id$
+ *
+ * __clear_user_page implementation of SuperH
+ *
+ * Copyright (C) 2001  Niibe Yutaka & Kaz Kojima
+ *
+ */
+
+/*
+ * __clear_user_page
+ * @to: P1 address (with same color)
+ * @orig_to: P1 address
+ *
+ * void __clear_user_page(void *to, void *orig_to)
+ */
+
+/*
+ * r0 --- scratch 
+ * r4 --- to
+ * r5 --- orig_to
+ * r6 --- to + 4096
+ */
+#include <linux/linkage.h>
+ENTRY(__clear_user_page)
+	mov	r4,r6
+	mov.w	.L4096,r0
+	add	r0,r6
+	mov	#0,r0
+	!
+1:	ocbi	@r5
+	add	#32,r5
+	movca.l	r0,@r4
+	mov	r4,r1
+	add	#32,r4
+	mov.l	r0,@-r4
+	mov.l	r0,@-r4
+	mov.l	r0,@-r4
+	mov.l	r0,@-r4
+	mov.l	r0,@-r4
+	mov.l	r0,@-r4
+	mov.l	r0,@-r4
+	add	#28,r4
+	cmp/eq	r6,r4
+	bf/s	1b
+	 ocbwb	@r1
+	!
+	rts
+	 nop
+.L4096:	.word	4096