LXR linux/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
  18static inline __wsum
  19csum_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),
  28#ifdef __MICROBLAZEEL__
  29        "d" ((len + proto) << 8)
  30#else
  31        "d" (len + proto)
  32#endif
  33);
  34        return sum;
  35}
  36
  37#include <asm-generic/checksum.h>
  38
  39#endif /* _ASM_MICROBLAZE_CHECKSUM_H */
  40