1 files changed, 29 insertions, 0 deletions

diff --git a/arch/arm/lib/testclearbit.S b/arch/arm/lib/testclearbit.S
new file mode 100644
index 000000000000..e07c5bd24307
--- /dev/null
+++ b/arch/arm/lib/testclearbit.S
@@ -0,0 +1,29 @@
+/*
+ *  linux/arch/arm/lib/testclearbit.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
+
+ENTRY(_test_and_clear_bit_be)
+                eor     r0, r0, #0x18           @ big endian byte ordering
+ENTRY(_test_and_clear_bit_le)
+                add     r1, r1, r0, lsr #3      @ Get byte offset
+                and     r3, r0, #7              @ Get bit offset
+                mov     r0, #1
+                save_and_disable_irqs ip, r2
+                ldrb    r2, [r1]
+                tst     r2, r0, lsl r3
+                bic     r2, r2, r0, lsl r3
+                strb    r2, [r1]
+                restore_irqs ip
+                moveq   r0, #0
+                RETINSTR(mov,pc,lr)
+
+