1 files changed, 76 insertions, 0 deletions

diff --git a/include/asm-ia64/checksum.h b/include/asm-ia64/checksum.h
new file mode 100644
index 000000000000..1f230ff8ea81
--- /dev/null
+++ b/include/asm-ia64/checksum.h
@@ -0,0 +1,76 @@
+#ifndef _ASM_IA64_CHECKSUM_H
+#define _ASM_IA64_CHECKSUM_H
+
+/*
+ * Modified 1998, 1999
+ *      David Mosberger-Tang <davidm@hpl.hp.com>, Hewlett-Packard Co
+ */
+
+/*
+ * This is a version of ip_compute_csum() optimized for IP headers,
+ * which always checksum on 4 octet boundaries.
+ */
+extern unsigned short ip_fast_csum (unsigned char * iph, unsigned int ihl);
+
+/*
+ * Computes the checksum of the TCP/UDP pseudo-header returns a 16-bit
+ * checksum, already complemented
+ */
+extern unsigned short int csum_tcpudp_magic (unsigned long saddr,
+                                             unsigned long daddr,
+                                             unsigned short len,
+                                             unsigned short proto,
+                                             unsigned int sum);
+
+extern unsigned int csum_tcpudp_nofold (unsigned long saddr,
+                                        unsigned long daddr,
+                                        unsigned short len,
+                                        unsigned short proto,
+                                        unsigned int sum);
+
+/*
+ * 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);
+
+/*
+ * Same as csum_partial, but copies from src while it checksums.
+ *
+ * Here it is even more important to align src and dst on a 32-bit (or
+ * even better 64-bit) boundary.
+ */
+extern unsigned int csum_partial_copy_from_user (const char *src, char *dst,
+                                                 int len, unsigned int sum,
+                                                 int *errp);
+
+extern unsigned int csum_partial_copy_nocheck (const char *src, char *dst,
+                                               int len, unsigned int sum);
+
+/*
+ * This routine is used for miscellaneous IP-like checksums, mainly in
+ * icmp.c
+ */
+extern unsigned short ip_compute_csum (unsigned char *buff, int len);
+
+/*
+ * Fold a partial checksum without adding pseudo headers.
+ */
+static inline unsigned short
+csum_fold (unsigned int sum)
+{
+        sum = (sum & 0xffff) + (sum >> 16);
+        sum = (sum & 0xffff) + (sum >> 16);
+        return ~sum;
+}
+
+#endif /* _ASM_IA64_CHECKSUM_H */