1/* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * MIPS64 specific IP/TCP/UDP checksumming routines 7 * 8 * Copyright (C) 1998, 1999 Ralf Baechle 9 */ 10#include <net/checksum.h> 11#include <linux/types.h> 12#include <asm/byteorder.h> 13#include <asm/string.h> 14#include <asm/uaccess.h> 15 16/* 17 * copy while checksumming, otherwise like csum_partial 18 */ 19unsigned int csum_partial_copy(const char *src, char *dst, 20 int len, unsigned int sum) 21{ 22 /* 23 * It's 2:30 am and I don't feel like doing it real ... 24 * This is lots slower than the real thing (tm) 25 */ 26 sum = csum_partial(src, len, sum); 27 memcpy(dst, src, len); 28 29 return sum; 30} 31 32/* 33 * Copy from userspace and compute checksum. If we catch an exception 34 * then zero the rest of the buffer. 35 */ 36unsigned int csum_partial_copy_from_user (const char *src, char *dst, 37 int len, unsigned int sum, 38 int *err_ptr) 39{ 40 int missing; 41 42 missing = copy_from_user(dst, src, len); 43 if (missing) { 44 memset(dst + len - missing, 0, missing); 45 *err_ptr = -EFAULT; 46 } 47 48 return csum_partial(dst, len, sum); 49} 50