release/src-rt-6.x.4708/linux/linux-2.6.36/arch/microblaze/include/asm/checksum.h

   1 /*
   2  * Copyright (C) 2008 Michal Simek <monstr@monstr.eu>
   3  * Copyright (C) 2006 Atmark Techno, Inc.
   4  *
   5  * This file is subject to the terms and conditions of the GNU General Public
   6  * License. See the file "COPYING" in the main directory of this archive
   7  * for more details.
   8  */
   9
  10 #ifndef _ASM_MICROBLAZE_CHECKSUM_H
  11 #define _ASM_MICROBLAZE_CHECKSUM_H
  12
  13 /*
  14  * computes the checksum of the TCP/UDP pseudo-header
  15  * returns a 16-bit checksum, already complemented
  16  */
  17 #define csum_tcpudp_nofold      csum_tcpudp_nofold
  18 static inline __wsum
  19 csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
  20                    unsigned short proto, __wsum sum)
  21 {
  22         __asm__("add %0, %0, %1\n\t"
  23                 "addc %0, %0, %2\n\t"
  24                 "addc %0, %0, %3\n\t"
  25                 "addc %0, %0, r0\n\t"
  26                 : "+&d" (sum)
  27                 : "d" (saddr), "d" (daddr), "d" (len + proto));
  28
  29         return sum;
  30 }
  31
  32 #include <asm-generic/checksum.h>
  33
  34 #endif /* _ASM_MICROBLAZE_CHECKSUM_H */