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 */ csum_long(unsigned long x)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