1 files changed, 31 insertions, 0 deletions
diff --git a/arch/arm/lib/clearbit.S b/arch/arm/lib/clearbit.S
new file mode 100644
index 00000000000..069a2ce413f
--- /dev/null
+++ b/arch/arm/lib/clearbit.S
@@ -0,0 +1,31 @@
+/*
+ *  linux/arch/arm/lib/clearbit.S
+ *
+ *  Copyright (C) 1995-1996 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+                .text
+
+/*
+ * Purpose  : Function to clear a bit
+ * Prototype: int clear_bit(int bit, void *addr)
+ */
+ENTRY(_clear_bit_be)
+		eor	r0, r0, #0x18		@ big endian byte ordering
+ENTRY(_clear_bit_le)
+		and	r2, r0, #7
+		mov	r3, #1
+		mov	r3, r3, lsl r2
+		save_and_disable_irqs ip, r2
+		ldrb	r2, [r1, r0, lsr #3]
+		bic	r2, r2, r3
+		strb	r2, [r1, r0, lsr #3]
+		restore_irqs ip
+		RETINSTR(mov,pc,lr)
+
+