1#ifndef __ASM_SH64_CHECKSUM_H
2#define __ASM_SH64_CHECKSUM_H
3
4/*
5 * This file is subject to the terms and conditions of the GNU General Public
6 * License.  See the file "COPYING" in the main directory of this archive
7 * for more details.
8 *
9 * include/asm-sh64/checksum.h
10 *
11 * Copyright (C) 2000, 2001  Paolo Alberelli
12 *
13 */
14
15#include <asm/registers.h>
16
17/*
18 * computes the checksum of a memory block at buff, length len,
19 * and adds in "sum" (32-bit)
20 *
21 * returns a 32-bit number suitable for feeding into itself
22 * or csum_tcpudp_magic
23 *
24 * this function must be called with even lengths, except
25 * for the last fragment, which may be odd
26 *
27 * it's best to have buff aligned on a 32-bit boundary
28 */
29asmlinkage __wsum csum_partial(const void *buff, int len, __wsum sum);
30
31/*
32 *	Note: when you get a NULL pointer exception here this means someone
33 *	passed in an incorrect kernel address to one of these functions.
34 *
35 *	If you use these functions directly please don't forget the
36 *	access_ok().
37 */
38
39
40__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len,
41				       __wsum sum);
42
43__wsum csum_partial_copy_from_user(const void __user *src, void *dst,
44					 int len, __wsum sum, int *err_ptr);
45
46static inline __sum16 csum_fold(__wsum csum)
47{
48	u32 sum = (__force u32)csum;
49        sum = (sum & 0xffff) + (sum >> 16);
50        sum = (sum & 0xffff) + (sum >> 16);
51        return (__force __sum16)~sum;
52}
53
54__sum16 ip_fast_csum(const void *iph, unsigned int ihl);
55
56__wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
57				 unsigned short len, unsigned short proto,
58				 __wsum sum);
59
60/*
61 * computes the checksum of the TCP/UDP pseudo-header
62 * returns a 16-bit checksum, already complemented
63 */
64static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
65						   unsigned short len,
66						   unsigned short proto,
67						   __wsum sum)
68{
69	return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
70}
71
72/*
73 * this routine is used for miscellaneous IP-like checksums, mainly
74 * in icmp.c
75 */
76static inline __sum16 ip_compute_csum(const void *buff, int len)
77{
78	return csum_fold(csum_partial(buff, len, 0));
79}
80
81#endif /* __ASM_SH64_CHECKSUM_H */
82