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1da177e4 LT |
1 | /* |
2 | * include/asm-v850/checksum.h -- Checksum ops | |
3 | * | |
623cdf4a MB |
4 | * Copyright (C) 2001,2005 NEC Corporation |
5 | * Copyright (C) 2001,2005 Miles Bader <miles@gnu.org> | |
1da177e4 LT |
6 | * |
7 | * This file is subject to the terms and conditions of the GNU General | |
8 | * Public License. See the file COPYING in the main directory of this | |
9 | * archive for more details. | |
10 | * | |
11 | * Written by Miles Bader <miles@gnu.org> | |
12 | */ | |
13 | ||
14 | #ifndef __V850_CHECKSUM_H__ | |
15 | #define __V850_CHECKSUM_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 | */ | |
9d3d4195 | 29 | extern __wsum csum_partial(const void *buff, int len, __wsum sum); |
1da177e4 LT |
30 | |
31 | /* | |
32 | * the same as csum_partial, but copies from src while it | |
33 | * checksums | |
34 | * | |
35 | * here even more important to align src and dst on a 32-bit (or even | |
36 | * better 64-bit) boundary | |
37 | */ | |
9d3d4195 AV |
38 | extern __wsum csum_partial_copy_nocheck(const void *src, |
39 | void *dst, int len, __wsum sum); | |
1da177e4 LT |
40 | |
41 | ||
42 | /* | |
43 | * the same as csum_partial_copy, but copies from user space. | |
44 | * | |
45 | * here even more important to align src and dst on a 32-bit (or even | |
46 | * better 64-bit) boundary | |
47 | */ | |
9d3d4195 AV |
48 | extern __wsum csum_partial_copy_from_user (const void *src, |
49 | void *dst, | |
50 | int len, __wsum sum, | |
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51 | int *csum_err); |
52 | ||
9d3d4195 | 53 | __sum16 ip_fast_csum(const void *iph, unsigned int ihl); |
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54 | |
55 | /* | |
56 | * Fold a partial checksum | |
57 | */ | |
9d3d4195 | 58 | static inline __sum16 csum_fold (__wsum sum) |
1da177e4 LT |
59 | { |
60 | unsigned int result; | |
61 | /* | |
62 | %0 %1 | |
63 | hsw %1, %0 H L L H | |
64 | add %1, %0 H L H+L+C H+L | |
65 | */ | |
66 | asm ("hsw %1, %0; add %1, %0" : "=&r" (result) : "r" (sum)); | |
9d3d4195 | 67 | return (__force __sum16)(~result >> 16); |
1da177e4 LT |
68 | } |
69 | ||
70 | ||
71 | /* | |
72 | * computes the checksum of the TCP/UDP pseudo-header | |
73 | * returns a 16-bit checksum, already complemented | |
74 | */ | |
9d3d4195 AV |
75 | static inline __wsum |
76 | csum_tcpudp_nofold (__be32 saddr, __be32 daddr, | |
1da177e4 | 77 | unsigned short len, |
9d3d4195 | 78 | unsigned short proto, __wsum sum) |
1da177e4 LT |
79 | { |
80 | int __carry; | |
81 | __asm__ ("add %2, %0;" | |
82 | "setf c, %1;" | |
83 | "add %1, %0;" | |
84 | "add %3, %0;" | |
85 | "setf c, %1;" | |
86 | "add %1, %0;" | |
87 | "add %4, %0;" | |
88 | "setf c, %1;" | |
89 | "add %1, %0" | |
90 | : "=&r" (sum), "=&r" (__carry) | |
91 | : "r" (daddr), "r" (saddr), | |
9d3d4195 | 92 | "r" ((len + proto) << 8), |
1da177e4 LT |
93 | "0" (sum)); |
94 | return sum; | |
95 | } | |
96 | ||
9d3d4195 AV |
97 | static inline __sum16 |
98 | csum_tcpudp_magic (__be32 saddr, __be32 daddr, | |
1da177e4 | 99 | unsigned short len, |
9d3d4195 | 100 | unsigned short proto, __wsum sum) |
1da177e4 LT |
101 | { |
102 | return csum_fold (csum_tcpudp_nofold (saddr, daddr, len, proto, sum)); | |
103 | } | |
104 | ||
105 | /* | |
106 | * this routine is used for miscellaneous IP-like checksums, mainly | |
107 | * in icmp.c | |
108 | */ | |
9d3d4195 | 109 | extern __sum16 ip_compute_csum(const void *buff, int len); |
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110 | |
111 | ||
112 | #endif /* __V850_CHECKSUM_H__ */ |