Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / arm / lib / muldi3.S

diff --git a/kernel/arch/arm/lib/muldi3.S b/kernel/arch/arm/lib/muldi3.S
new file mode 100644 (file)
index 0000000..2043059
--- /dev/null
+++ b/kernel/arch/arm/lib/muldi3.S
@@ -0,0 +1,48 @@
+/*
+ *  linux/arch/arm/lib/muldi3.S
+ *
+ *  Author:     Nicolas Pitre
+ *  Created:    Oct 19, 2005
+ *  Copyright:  Monta Vista Software, Inc.
+ *
+ *  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>
+
+#ifdef __ARMEB__
+#define xh r0
+#define xl r1
+#define yh r2
+#define yl r3
+#else
+#define xl r0
+#define xh r1
+#define yl r2
+#define yh r3
+#endif
+
+ENTRY(__muldi3)
+ENTRY(__aeabi_lmul)
+
+       mul     xh, yl, xh
+       mla     xh, xl, yh, xh
+       mov     ip, xl, lsr #16
+       mov     yh, yl, lsr #16
+       bic     xl, xl, ip, lsl #16
+       bic     yl, yl, yh, lsl #16
+       mla     xh, yh, ip, xh
+       mul     yh, xl, yh
+       mul     xl, yl, xl
+       mul     ip, yl, ip
+       adds    xl, xl, yh, lsl #16
+       adc     xh, xh, yh, lsr #16
+       adds    xl, xl, ip, lsl #16
+       adc     xh, xh, ip, lsr #16
+       ret     lr
+
+ENDPROC(__muldi3)
+ENDPROC(__aeabi_lmul)