From: Russell King <rmk@dyn-67.arm.linux.org.uk>
Date: Mon, 18 Apr 2005 21:50:01 +0000 (+0100)
Subject: [PATCH] ARM: Add missing new file for bitops patch
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=7a55fd0bb31eb369149b89fdf9e0c7bc73486ee1;p=openwrt%2Fstaging%2Fblogic.git

[PATCH] ARM: Add missing new file for bitops patch

Signed-off-by: Russell King <rmk@arm.linux.org.uk>
---

diff --git a/arch/arm/lib/bitops.h b/arch/arm/lib/bitops.h
new file mode 100644
index 000000000000..4a83ab6cd565
--- /dev/null
+++ b/arch/arm/lib/bitops.h
@@ -0,0 +1,33 @@
+	.macro	bitop, instr
+	and	r2, r0, #7
+	mov	r3, #1
+	mov	r3, r3, lsl r2
+	save_and_disable_irqs ip, r2
+	ldrb	r2, [r1, r0, lsr #3]
+	\instr	r2, r2, r3
+	strb	r2, [r1, r0, lsr #3]
+	restore_irqs ip
+	mov	pc, lr
+	.endm
+
+/**
+ * testop - implement a test_and_xxx_bit operation.
+ * @instr: operational instruction
+ * @store: store instruction
+ *
+ * Note: we can trivially conditionalise the store instruction
+ * to avoid dirting the data cache.
+ */
+	.macro	testop, instr, store
+	add	r1, r1, r0, lsr #3
+	and	r3, r0, #7
+	mov	r0, #1
+	save_and_disable_irqs ip, r2
+	ldrb	r2, [r1]
+	tst	r2, r0, lsl r3
+	\instr	r2, r2, r0, lsl r3
+	\store	r2, [r1]
+	restore_irqs ip
+	moveq	r0, #0
+	mov	pc, lr
+	.endm