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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 | */ | |
29 | asmlinkage unsigned int csum_partial(const unsigned char *buff, int len, | |
30 | unsigned int sum); | |
31 | ||
32 | /* | |
33 | * Note: when you get a NULL pointer exception here this means someone | |
34 | * passed in an incorrect kernel address to one of these functions. | |
35 | * | |
36 | * If you use these functions directly please don't forget the | |
e49332bd | 37 | * access_ok(). |
1da177e4 LT |
38 | */ |
39 | ||
40 | ||
41 | unsigned int csum_partial_copy_nocheck(const char *src, char *dst, int len, | |
42 | unsigned int sum); | |
43 | ||
44 | unsigned int csum_partial_copy_from_user(const char *src, char *dst, | |
45 | int len, int sum, int *err_ptr); | |
46 | ||
47 | /* | |
48 | * These are the old (and unsafe) way of doing checksums, a warning message will be | |
49 | * printed if they are used and an exeption occurs. | |
50 | * | |
51 | * these functions should go away after some time. | |
52 | */ | |
53 | ||
54 | #define csum_partial_copy_fromuser csum_partial_copy | |
55 | ||
56 | unsigned int csum_partial_copy(const char *src, char *dst, int len, | |
57 | unsigned int sum); | |
58 | ||
59 | static inline unsigned short csum_fold(unsigned int sum) | |
60 | { | |
61 | sum = (sum & 0xffff) + (sum >> 16); | |
62 | sum = (sum & 0xffff) + (sum >> 16); | |
63 | return ~(sum); | |
64 | } | |
65 | ||
66 | unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl); | |
67 | ||
68 | unsigned long csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, | |
69 | unsigned short len, unsigned short proto, | |
70 | unsigned int sum); | |
71 | ||
72 | /* | |
73 | * computes the checksum of the TCP/UDP pseudo-header | |
74 | * returns a 16-bit checksum, already complemented | |
75 | */ | |
76 | static inline unsigned short int csum_tcpudp_magic(unsigned long saddr, | |
77 | unsigned long daddr, | |
78 | unsigned short len, | |
79 | unsigned short proto, | |
80 | unsigned int sum) | |
81 | { | |
82 | return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); | |
83 | } | |
84 | ||
85 | /* | |
86 | * this routine is used for miscellaneous IP-like checksums, mainly | |
87 | * in icmp.c | |
88 | */ | |
89 | static inline unsigned short ip_compute_csum(unsigned char * buff, int len) | |
90 | { | |
91 | return csum_fold(csum_partial(buff, len, 0)); | |
92 | } | |
93 | ||
94 | #endif /* __ASM_SH64_CHECKSUM_H */ | |
95 |