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