arch/blackfin/include/asm/checksum.h

   1 /*
   2  * Copyright 2004-2009 Analog Devices Inc.
   3  *                     akbar.hussain@lineo.com
   4  *
   5  * Licensed under the GPL-2 or later.
   6  */
   7
   8 #ifndef _BFIN_CHECKSUM_H
   9 #define _BFIN_CHECKSUM_H
  10
  11 /*
  12  * computes the checksum of the TCP/UDP pseudo-header
  13  * returns a 16-bit checksum, already complemented
  14  */
  15
  16 static inline __wsum
  17 __csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len,
  18                      __u8 proto, __wsum sum)
  19 {
  20         unsigned int carry;
  21
  22         __asm__ ("%0 = %0 + %2;\n\t"
  23                 "CC = AC0;\n\t"
  24                 "%1 = CC;\n\t"
  25                 "%0 = %0 + %1;\n\t"
  26                 "%0 = %0 + %3;\n\t"
  27                 "CC = AC0;\n\t"
  28                 "%1 = CC;\n\t"
  29                 "%0 = %0 + %1;\n\t"
  30                 "%0 = %0 + %4;\n\t"
  31                 "CC = AC0;\n\t"
  32                 "%1 = CC;\n\t"
  33                 "%0 = %0 + %1;\n\t"
  34                 : "=d" (sum), "=&d" (carry)
  35                 : "d" (daddr), "d" (saddr), "d" ((len + proto) << 8), "0"(sum)
  36                 : "CC");
  37
  38         return (sum);
  39 }
  40 #define csum_tcpudp_nofold __csum_tcpudp_nofold
  41
  42 #include <asm-generic/checksum.h>
  43
  44 #endif