LXR linux/arch/unicore32/include/asm/checksum.h

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * linux/arch/unicore32/include/asm/checksum.h
   4 *
   5 * Code specific to PKUnity SoC and UniCore ISA
   6 *
   7 * Copyright (C) 2001-2010 GUAN Xue-tao
   8 *
   9 * IP checksum routines
  10 */
  11#ifndef __UNICORE_CHECKSUM_H__
  12#define __UNICORE_CHECKSUM_H__
  13
  14/*
  15 * computes the checksum of the TCP/UDP pseudo-header
  16 * returns a 16-bit checksum, already complemented
  17 */
  18
  19static inline __wsum
  20csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len,
  21                   __u8 proto, __wsum sum)
  22{
  23        __asm__(
  24        "add.a  %0, %1, %2\n"
  25        "addc.a %0, %0, %3\n"
  26        "addc.a %0, %0, %4 << #8\n"
  27        "addc.a %0, %0, %5\n"
  28        "addc   %0, %0, #0\n"
  29        : "=&r"(sum)
  30        : "r" (sum), "r" (daddr), "r" (saddr), "r" (len), "Ir" (htons(proto))
  31        : "cc");
  32        return sum;
  33}
  34#define csum_tcpudp_nofold      csum_tcpudp_nofold
  35
  36#include <asm-generic/checksum.h>
  37
  38#endif
  39