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