#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 __wsum csum_partial(const void *buff, int len, __wsum 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

   *	access_ok().

   */

  __wsum csum_partial_copy_nocheck(const void *src, void *dst, int len,
  				       __wsum sum);

  __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
  					 int len, __wsum sum, int *err_ptr);

  static inline __sum16 csum_fold(__wsum csum)

  {

  	u32 sum = (__force u32)csum;

          sum = (sum & 0xffff) + (sum >> 16);
          sum = (sum & 0xffff) + (sum >> 16);

          return (__force __sum16)~sum;

  }

  __sum16 ip_fast_csum(const void *iph, unsigned int ihl);

  __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,

  				 unsigned short len, unsigned short proto,

  				 __wsum sum);

  
  /*
   * computes the checksum of the TCP/UDP pseudo-header
   * returns a 16-bit checksum, already complemented
   */

  static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,

  						   unsigned short len,
  						   unsigned short proto,

  						   __wsum 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 __sum16 ip_compute_csum(const void *buff, int len)

  {
  	return csum_fold(csum_partial(buff, len, 0));
  }
  
  #endif /* __ASM_SH64_CHECKSUM_H */