/*
* 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 */