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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/arm/lib/clearbit.S
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/arm/lib/clearbit.S')
-rw-r--r--arch/arm/lib/clearbit.S31
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/arm/lib/clearbit.S b/arch/arm/lib/clearbit.S
new file mode 100644
index 00000000000..069a2ce413f
--- /dev/null
+++ b/arch/arm/lib/clearbit.S
@@ -0,0 +1,31 @@
+/*
+ * linux/arch/arm/lib/clearbit.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 clear a bit
+ * Prototype: int clear_bit(int bit, void *addr)
+ */
+ENTRY(_clear_bit_be)
+ eor r0, r0, #0x18 @ big endian byte ordering
+ENTRY(_clear_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]
+ bic r2, r2, r3
+ strb r2, [r1, r0, lsr #3]
+ restore_irqs ip
+ RETINSTR(mov,pc,lr)
+
+