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 000000000000..d3aedb7bfc5c
--- /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__ */