1 files changed, 29 insertions, 0 deletions
diff --git a/arch/cris/include/arch-v10/arch/checksum.h b/arch/cris/include/arch-v10/arch/checksum.h
new file mode 100644
index 000000000000..b8000c5d7fe1
--- /dev/null
+++ b/arch/cris/include/arch-v10/arch/checksum.h
@@ -0,0 +1,29 @@
+#ifndef _CRIS_ARCH_CHECKSUM_H
+#define _CRIS_ARCH_CHECKSUM_H
+
+/* Checksum some values used in TCP/UDP headers.
+ *
+ * The gain by doing this in asm is that C will not generate carry-additions
+ * for the 32-bit components of the checksum, so otherwise we would have had
+ * to split all of those into 16-bit components, then add.
+ */
+
+static inline __wsum
+csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
+		   unsigned short proto, __wsum sum)
+{
+	__wsum res;
+	__asm__ ("add.d %2, %0\n\t"
+		 "ax\n\t"
+		 "add.d %3, %0\n\t"
+		 "ax\n\t"
+		 "add.d %4, %0\n\t"
+		 "ax\n\t"
+		 "addq 0, %0\n"
+	: "=r" (res)
+	: "0" (sum), "r" (daddr), "r" (saddr), "r" ((len + proto) << 8));
+
+	return res;
+}	
+
+#endif