text: #ifndef _CRIS_ARCH_CHECKSUM_H
  #define _CRIS_ARCH_CHECKSUM_H
  
  /* Checksum some values used in TCP/UDP headers.
   *
   * The gain by doing this in asm is that C will not generate carry-additions
   * for the 32-bit components of the checksum, so otherwise we would have had
   * to split all of those into 16-bit components, then add.
   */
  
  static inline __wsum
  csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len,
  		   __u8 proto, __wsum sum)
  {
  	__wsum res;
  	__asm__ ("add.d %2, %0\n\t"
  		 "ax\n\t"
  		 "add.d %3, %0\n\t"
  		 "ax\n\t"
  		 "add.d %4, %0\n\t"
  		 "ax\n\t"
  		 "addq 0, %0\n"
  	: "=r" (res)
  	: "0" (sum), "r" (daddr), "r" (saddr), "r" ((len + proto) << 8));
  
  	return res;
  }	
  
  #endif
  