1 files changed, 115 insertions, 0 deletions
diff --git a/include/asm-v850/checksum.h b/include/asm-v850/checksum.h
new file mode 100644
index 0000000..d3aedb7
--- /dev/null
+++ b/include/asm-v850/checksum.h
@@ -0,0 +1,115 @@
+/*
+ * include/asm-v850/checksum.h -- Checksum ops
+ *
+ *  Copyright (C) 2001  NEC Corporation
+ *  Copyright (C) 2001  Miles Bader <miles@gnu.org>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License.  See the file COPYING in the main directory of this
+ * archive for more details.
+ *
+ * Written by Miles Bader <miles@gnu.org>
+ */
+
+#ifndef __V850_CHECKSUM_H__
+#define __V850_CHECKSUM_H__
+
+/*
+ * computes the checksum of a memory block at buff, length len,
+ * and adds in "sum" (32-bit)
+ *
+ * returns a 32-bit number suitable for feeding into itself
+ * or csum_tcpudp_magic
+ *
+ * this function must be called with even lengths, except
+ * for the last fragment, which may be odd
+ *
+ * it's best to have buff aligned on a 32-bit boundary
+ */
+extern unsigned int csum_partial (const unsigned char * buff, int len,
+				  unsigned int sum);
+
+/*
+ * the same as csum_partial, but copies from src while it
+ * checksums
+ *
+ * here even more important to align src and dst on a 32-bit (or even
+ * better 64-bit) boundary
+ */
+extern unsigned csum_partial_copy (const char *src, char *dst, int len,
+				   unsigned sum);
+
+
+/*
+ * the same as csum_partial_copy, but copies from user space.
+ *
+ * here even more important to align src and dst on a 32-bit (or even
+ * better 64-bit) boundary
+ */
+extern unsigned csum_partial_copy_from_user (const char *src, char *dst,
+					     int len, unsigned sum,
+					     int *csum_err);
+
+#define csum_partial_copy_nocheck(src, dst, len, sum)	\
+	csum_partial_copy ((src), (dst), (len), (sum))
+
+unsigned short ip_fast_csum (unsigned char *iph, unsigned int ihl);
+
+/*
+ *	Fold a partial checksum
+ */
+static inline unsigned int csum_fold (unsigned long sum)
+{
+	unsigned int result;
+	/*
+			        %0		%1
+	      hsw %1, %0	H     L		L     H
+	      add %1, %0	H     L		H+L+C H+L
+	*/
+	asm ("hsw %1, %0; add %1, %0" : "=&r" (result) : "r" (sum));
+	return (~result) >> 16;
+}
+
+
+/*
+ * computes the checksum of the TCP/UDP pseudo-header
+ * returns a 16-bit checksum, already complemented
+ */
+static inline unsigned int
+csum_tcpudp_nofold (unsigned long saddr, unsigned long daddr,
+		    unsigned short len,
+		    unsigned short proto, unsigned int sum)
+{
+	int __carry;
+	__asm__ ("add %2, %0;"
+		 "setf c, %1;"
+		 "add %1, %0;"
+		 "add %3, %0;"
+		 "setf c, %1;"
+		 "add %1, %0;"
+		 "add %4, %0;"
+		 "setf c, %1;"
+		 "add %1, %0"
+		 : "=&r" (sum), "=&r" (__carry)
+		 : "r" (daddr), "r" (saddr),
+		 "r" (ntohs (len) + (proto << 8)),
+		 "0" (sum));
+	return sum;
+}
+
+static inline unsigned short int
+csum_tcpudp_magic (unsigned long saddr, unsigned long daddr,
+		   unsigned short len,
+		   unsigned short proto, unsigned int sum)
+{
+	return csum_fold (csum_tcpudp_nofold (saddr, daddr, len, proto, sum));
+}
+
+/*
+ * this routine is used for miscellaneous IP-like checksums, mainly
+ * in icmp.c
+ */
+extern unsigned short ip_compute_csum (const unsigned char * buff, int len);
+
+
+#endif /* __V850_CHECKSUM_H__ */