C6X: library code

Original port to early 2.6 kernel using TI COFF toolchain.
Brought up to date by Mark Salter <msalter@redhat.com>

Signed-off-by: Aurelien Jacquiot <a-jacquiot@ti.com>
Signed-off-by: Mark Salter <msalter@redhat.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>

arch/c6x/include/asm/checksum.h

@@ -0,0 +1,34 @@
+/*
+ *  Copyright (C) 2011 Texas Instruments Incorporated
+ *  Author: Mark Salter <msalter@redhat.com>
+ *
+ *  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.
+ */
+#ifndef _ASM_C6X_CHECKSUM_H
+#define _ASM_C6X_CHECKSUM_H
+
+static inline __wsum
+csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
+		   unsigned short proto, __wsum sum)
+{
+	unsigned long long tmp;
+
+	asm ("add     .d1   %1,%5,%1\n"
+	     "|| addu .l1   %3,%4,%0\n"
+	     "addu    .l1   %2,%0,%0\n"
+#ifndef CONFIG_CPU_BIG_ENDIAN
+	     "|| shl  .s1   %1,8,%1\n"
+#endif
+	     "addu    .l1   %1,%0,%0\n"
+	     "add     .l1   %P0,%p0,%2\n"
+	     : "=&a"(tmp), "+a"(len), "+a"(sum)
+	     : "a" (saddr), "a" (daddr), "a" (proto));
+	return sum;
+}
+#define csum_tcpudp_nofold csum_tcpudp_nofold
+
+#include <asm-generic/checksum.h>
+
+#endif /* _ASM_C6X_CHECKSUM_H */