1/*
2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
3 *
4 *   This program is free software; you can redistribute it and/or
5 *   modify it under the terms of the GNU General Public License
6 *   as published by the Free Software Foundation, version 2.
7 *
8 *   This program is distributed in the hope that it will be useful, but
9 *   WITHOUT ANY WARRANTY; without even the implied warranty of
10 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 *   NON INFRINGEMENT.  See the GNU General Public License for
12 *   more details.
13 */
14
15#ifndef _ASM_TILE_CHECKSUM_H
16#define _ASM_TILE_CHECKSUM_H
17
18#include <asm-generic/checksum.h>
19
20/* Allow us to provide a more optimized do_csum(). */
21__wsum do_csum(const unsigned char *buff, int len);
22#define do_csum do_csum
23
24/*
25 * Return the sum of all the 16-bit subwords in a long.
26 * This sums two subwords on a 32-bit machine, and four on 64 bits.
27 * The implementation does two vector adds to capture any overflow.
28 */
29static inline unsigned int csum_long(unsigned long x)
30{
31	unsigned long ret;
32#ifdef __tilegx__
33	ret = __insn_v2sadu(x, 0);
34	ret = __insn_v2sadu(ret, 0);
35#else
36	ret = __insn_sadh_u(x, 0);
37	ret = __insn_sadh_u(ret, 0);
38#endif
39	return ret;
40}
41
42#endif /* _ASM_TILE_CHECKSUM_H */
43