arch/unicore32/include/asm/checksum.h

   1 /*
   2  * linux/arch/unicore32/include/asm/checksum.h
   3  *
   4  * Code specific to PKUnity SoC and UniCore ISA
   5  *
   6  * Copyright (C) 2001-2010 GUAN Xue-tao
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * IP checksum routines
  13  */
  14 #ifndef __UNICORE_CHECKSUM_H__
  15 #define __UNICORE_CHECKSUM_H__
  16
  17 /*
  18  * computes the checksum of the TCP/UDP pseudo-header
  19  * returns a 16-bit checksum, already complemented
  20  */
  21
  22 static inline __wsum
  23 csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len,
  24                    __u8 proto, __wsum sum)
  25 {
  26         __asm__(
  27         "add.a  %0, %1, %2\n"
  28         "addc.a %0, %0, %3\n"
  29         "addc.a %0, %0, %4 << #8\n"
  30         "addc.a %0, %0, %5\n"
  31         "addc   %0, %0, #0\n"
  32         : "=&r"(sum)
  33         : "r" (sum), "r" (daddr), "r" (saddr), "r" (len), "Ir" (htons(proto))
  34         : "cc");
  35         return sum;
  36 }
  37 #define csum_tcpudp_nofold      csum_tcpudp_nofold
  38
  39 #include <asm-generic/checksum.h>
  40
  41 #endif