arch/microblaze/include/asm/checksum.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2008 Michal Simek <monstr@monstr.eu>
   4  * Copyright (C) 2006 Atmark Techno, Inc.
   5  */
   6
   7 #ifndef _ASM_MICROBLAZE_CHECKSUM_H
   8 #define _ASM_MICROBLAZE_CHECKSUM_H
   9
  10 /*
  11  * computes the checksum of the TCP/UDP pseudo-header
  12  * returns a 16-bit checksum, already complemented
  13  */
  14 #define csum_tcpudp_nofold      csum_tcpudp_nofold
  15 static inline __wsum
  16 csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len,
  17                    __u8 proto, __wsum sum)
  18 {
  19         __asm__("add %0, %0, %1\n\t"
  20                 "addc %0, %0, %2\n\t"
  21                 "addc %0, %0, %3\n\t"
  22                 "addc %0, %0, r0\n\t"
  23                 : "+&d" (sum)
  24                 : "d" (saddr), "d" (daddr),
  25 #ifdef __MICROBLAZEEL__
  26         "d" ((len + proto) << 8)
  27 #else
  28         "d" (len + proto)
  29 #endif
  30 );
  31         return sum;
  32 }
  33
  34 #include <asm-generic/checksum.h>
  35
  36 #endif /* _ASM_MICROBLAZE_CHECKSUM_H */