1 files changed, 26 insertions, 0 deletions
diff --git a/arch/arm/lib/changebit.S b/arch/arm/lib/changebit.S
new file mode 100644
index 000000000..8005fd49a
--- /dev/null
+++ b/arch/arm/lib/changebit.S
@@ -0,0 +1,26 @@
+/*
+ * linux/arch/arm/lib/changebit.S
+ *
+ * Copyright (C) 1995-1996 Russell King
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+                .text
+
+/* Purpose  : Function to change a bit
+ * Prototype: int change_bit(int bit,int *addr)
+ */
+ENTRY(change_bit)
+                and     r2, r0, #7
+                mov     r3, #1
+                mov     r3, r3, lsl r2
+		SAVEIRQS(ip)
+		DISABLEIRQS(ip)
+		ldrb	r2, [r1, r0, lsr #3]
+		eor	r2, r2, r3
+		strb	r2, [r1, r0, lsr #3]
+		RESTOREIRQS(ip)
+		RETINSTR(mov,pc,lr)
+
+