patch-2.2.18 linux/arch/arm/lib/clearbit.S

• Lines: 27
• Date: Fri Sep 15 23:28:37 2000
• Orig file: v2.2.17/arch/arm/lib/clearbit.S
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/arch/arm/lib/clearbit.S linux/arch/arm/lib/clearbit.S
@@ -0,0 +1,26 @@
+/*
+ * linux/arch/arm/lib/clearbit.S
+ *
+ * Copyright (C) 1995-1996 Russell King
+ */
+
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+                .text
+
+@ Purpose  : Function to clear a bit
+@ Prototype: int clear_bit(int bit,int *addr)
+
+ENTRY(clear_bit)
+		and	r2, r0, #7
+		mov	r3, #1
+		mov	r3, r3, lsl r2
+		SAVEIRQS(ip)
+		DISABLEIRQS(ip)
+		ldrb	r2, [r1, r0, lsr #3]
+		bic	r2, r2, r3
+		strb	r2, [r1, r0, lsr #3]
+		RESTOREIRQS(ip)
+		RETINSTR(mov,pc,lr)
+
+