1 files changed, 28 insertions, 0 deletions

diff --git a/arch/arm/lib/changebit.S b/arch/arm/lib/changebit.S
new file mode 100644
index 000000000000..3af45cab70e1
--- /dev/null
+++ b/arch/arm/lib/changebit.S
@@ -0,0 +1,28 @@
+/*
+ *  linux/arch/arm/lib/changebit.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 change a bit
+ * Prototype: int change_bit(int bit, void *addr)
+ */
+ENTRY(_change_bit_be)
+                eor     r0, r0, #0x18           @ big endian byte ordering
+ENTRY(_change_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]
+                eor     r2, r2, r3
+                strb    r2, [r1, r0, lsr #3]
+                restore_irqs ip
+                RETINSTR(mov,pc,lr)