This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / include / asm-sh64 / checksum.h

diff --git a/include/asm-sh64/checksum.h b/include/asm-sh64/checksum.h
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+++ b/include/asm-sh64/checksum.h
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+#ifndef __ASM_SH64_CHECKSUM_H
+#define __ASM_SH64_CHECKSUM_H
+
+/*
+ * 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.
+ *
+ * include/asm-sh64/checksum.h
+ *
+ * Copyright (C) 2000, 2001  Paolo Alberelli
+ *
+ */
+
+#include <asm/registers.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
+ */
+asmlinkage unsigned int csum_partial(const unsigned char *buff, int len,
+                                    unsigned int sum);
+
+/*
+ *     Note: when you get a NULL pointer exception here this means someone
+ *     passed in an incorrect kernel address to one of these functions.
+ *
+ *     If you use these functions directly please don't forget the
+ *     verify_area().
+ */
+
+
+unsigned int csum_partial_copy_nocheck(const char *src, char *dst, int len,
+                                      unsigned int sum);
+
+unsigned int csum_partial_copy_from_user(const char *src, char *dst,
+                                        int len, int sum, int *err_ptr);
+
+/*
+ * These are the old (and unsafe) way of doing checksums, a warning message will be
+ * printed if they are used and an exeption occurs.
+ *
+ * these functions should go away after some time.
+ */
+
+#define csum_partial_copy_fromuser csum_partial_copy
+
+unsigned int csum_partial_copy(const char *src, char *dst, int len,
+                              unsigned int sum);
+
+static inline unsigned short csum_fold(unsigned int sum)
+{
+        sum = (sum & 0xffff) + (sum >> 16);
+        sum = (sum & 0xffff) + (sum >> 16);
+        return ~(sum);
+}
+
+unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl);
+
+unsigned long csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
+                                unsigned short len, unsigned short proto,
+                                unsigned int sum);
+
+/*
+ * computes the checksum of the TCP/UDP pseudo-header
+ * returns a 16-bit checksum, already complemented
+ */
+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
+ */
+static inline unsigned short ip_compute_csum(unsigned char * buff, int len)
+{
+       return csum_fold(csum_partial(buff, len, 0));
+}
+
+#endif /* __ASM_SH64_CHECKSUM_H */
+