1/* 2 * arch/score/lib/csum_partial_copy.c 3 * 4 * Score Processor version. 5 * 6 * Copyright (C) 2009 Sunplus Core Technology Co., Ltd. 7 * Lennox Wu <lennox.wu@sunplusct.com> 8 * Chen Liqin <liqin.chen@sunplusct.com> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, see the file COPYING, or write 22 * to the Free Software Foundation, Inc., 23 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 24 */ 25 26#include <net/checksum.h> 27 28#include <asm/uaccess.h> 29 30unsigned int csum_partial_copy(const char *src, char *dst, 31 int len, unsigned int sum) 32{ 33 sum = csum_partial(src, len, sum); 34 memcpy(dst, src, len); 35 36 return sum; 37} 38 39unsigned int csum_partial_copy_from_user(const char *src, char *dst, 40 int len, unsigned int sum, 41 int *err_ptr) 42{ 43 int missing; 44 45 missing = copy_from_user(dst, src, len); 46 if (missing) { 47 memset(dst + len - missing, 0, missing); 48 *err_ptr = -EFAULT; 49 } 50 51 return csum_partial(dst, len, sum); 52} 53