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kernel/linux-rt-4.4.41/arch/tile/include/asm/checksum.h 1.23 KB
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  /*
   * Copyright 2010 Tilera Corporation. All Rights Reserved.
   *
   *   This program is free software; you can redistribute it and/or
   *   modify it under the terms of the GNU General Public License
   *   as published by the Free Software Foundation, version 2.
   *
   *   This program is distributed in the hope that it will be useful, but
   *   WITHOUT ANY WARRANTY; without even the implied warranty of
   *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
   *   NON INFRINGEMENT.  See the GNU General Public License for
   *   more details.
   */
  
  #ifndef _ASM_TILE_CHECKSUM_H
  #define _ASM_TILE_CHECKSUM_H
  
  #include <asm-generic/checksum.h>
  
  /* Allow us to provide a more optimized do_csum(). */
  __wsum do_csum(const unsigned char *buff, int len);
  #define do_csum do_csum
  
  /*
   * Return the sum of all the 16-bit subwords in a long.
   * This sums two subwords on a 32-bit machine, and four on 64 bits.
   * The implementation does two vector adds to capture any overflow.
   */
  static inline unsigned int csum_long(unsigned long x)
  {
  	unsigned long ret;
  #ifdef __tilegx__
  	ret = __insn_v2sadu(x, 0);
  	ret = __insn_v2sadu(ret, 0);
  #else
  	ret = __insn_sadh_u(x, 0);
  	ret = __insn_sadh_u(ret, 0);
  #endif
  	return ret;
  }
  
  #endif /* _ASM_TILE_CHECKSUM_H */