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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 | */ | |
c459dd90 | 29 | asmlinkage __wsum csum_partial(const void *buff, int len, __wsum sum); |
1da177e4 LT |
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 | |
e49332bd | 36 | * access_ok(). |
1da177e4 LT |
37 | */ |
38 | ||
39 | ||
c459dd90 AV |
40 | __wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, |
41 | __wsum sum); | |
1da177e4 | 42 | |
c459dd90 AV |
43 | __wsum csum_partial_copy_from_user(const void __user *src, void *dst, |
44 | int len, __wsum sum, int *err_ptr); | |
1da177e4 | 45 | |
c459dd90 | 46 | static inline __sum16 csum_fold(__wsum csum) |
1da177e4 | 47 | { |
c459dd90 | 48 | u32 sum = (__force u32)csum; |
1da177e4 LT |
49 | sum = (sum & 0xffff) + (sum >> 16); |
50 | sum = (sum & 0xffff) + (sum >> 16); | |
c459dd90 | 51 | return (__force __sum16)~sum; |
1da177e4 LT |
52 | } |
53 | ||
c459dd90 | 54 | __sum16 ip_fast_csum(const void *iph, unsigned int ihl); |
1da177e4 | 55 | |
c459dd90 | 56 | __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, |
1da177e4 | 57 | unsigned short len, unsigned short proto, |
c459dd90 | 58 | __wsum sum); |
1da177e4 LT |
59 | |
60 | /* | |
61 | * computes the checksum of the TCP/UDP pseudo-header | |
62 | * returns a 16-bit checksum, already complemented | |
63 | */ | |
c459dd90 | 64 | static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, |
1da177e4 LT |
65 | unsigned short len, |
66 | unsigned short proto, | |
c459dd90 | 67 | __wsum sum) |
1da177e4 LT |
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 | */ | |
c459dd90 | 76 | static inline __sum16 ip_compute_csum(const void *buff, int len) |
1da177e4 LT |
77 | { |
78 | return csum_fold(csum_partial(buff, len, 0)); | |
79 | } | |
80 | ||
81 | #endif /* __ASM_SH64_CHECKSUM_H */ | |
82 |