patch-2.3.40 linux/arch/arm/lib/testclearbit.S

• Lines: 26
• Date: Thu Jan 13 13:30:31 2000
• Orig file: v2.3.39/linux/arch/arm/lib/testclearbit.S
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.39/linux/arch/arm/lib/testclearbit.S linux/arch/arm/lib/testclearbit.S
@@ -0,0 +1,25 @@
+/*
+ * linux/arch/arm/lib/testclearbit.S
+ *
+ * Copyright (C) 1995-1996 Russell King
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+                .text
+
+ENTRY(test_and_clear_bit)
+		add	r1, r1, r0, lsr #3	@ Get byte offset
+		and	r3, r0, #7	@ Get bit offset
+		mov	r0, #1
+		SAVEIRQS(ip)
+		DISABLEIRQS(ip)
+		ldrb	r2, [r1]
+		tst	r2, r0, lsl r3
+		bic	r2, r2, r0, lsl r3
+		moveq	r0, #0
+		strb	r2, [r1]
+		RESTOREIRQS(ip)
+		RETINSTR(mov,pc,lr)
+
+