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b920de1b DH |
1 | /* MN10300 Optimised checksumming code |
2 | * | |
3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public Licence | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the Licence, or (at your option) any later version. | |
10 | */ | |
11 | #ifndef _ASM_CHECKSUM_H | |
12 | #define _ASM_CHECKSUM_H | |
13 | ||
14 | extern __wsum csum_partial(const void *buff, int len, __wsum sum); | |
15 | extern __wsum csum_partial_copy_nocheck(const void *src, void *dst, | |
16 | int len, __wsum sum); | |
17 | extern __wsum csum_partial_copy_from_user(const void *src, void *dst, | |
18 | int len, __wsum sum, | |
19 | int *err_ptr); | |
20 | extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl); | |
21 | extern __wsum csum_partial(const void *buff, int len, __wsum sum); | |
22 | extern __sum16 ip_compute_csum(const void *buff, int len); | |
23 | ||
24 | #define csum_partial_copy_fromuser csum_partial_copy | |
25 | extern __wsum csum_partial_copy(const void *src, void *dst, int len, | |
26 | __wsum sum); | |
27 | ||
28 | static inline __sum16 csum_fold(__wsum sum) | |
29 | { | |
30 | asm( | |
31 | " add %1,%0 \n" | |
32 | " addc 0xffff,%0 \n" | |
33 | : "=r" (sum) | |
34 | : "r" (sum << 16), "0" (sum & 0xffff0000) | |
35 | : "cc" | |
36 | ); | |
37 | return (~sum) >> 16; | |
38 | } | |
39 | ||
40 | static inline __wsum csum_tcpudp_nofold(unsigned long saddr, | |
41 | unsigned long daddr, | |
42 | unsigned short len, | |
43 | unsigned short proto, | |
44 | __wsum sum) | |
45 | { | |
46 | __wsum tmp; | |
47 | ||
48 | tmp = (__wsum) ntohs(len) << 16; | |
49 | tmp += (__wsum) proto << 8; | |
50 | ||
51 | asm( | |
52 | " add %1,%0 \n" | |
53 | " addc %2,%0 \n" | |
54 | " addc %3,%0 \n" | |
55 | " addc 0,%0 \n" | |
56 | : "=r" (sum) | |
57 | : "r" (daddr), "r"(saddr), "r"(tmp), "0"(sum) | |
58 | : "cc" | |
59 | ); | |
60 | return sum; | |
61 | } | |
62 | ||
63 | /* | |
64 | * computes the checksum of the TCP/UDP pseudo-header | |
65 | * returns a 16-bit checksum, already complemented | |
66 | */ | |
67 | static inline __sum16 csum_tcpudp_magic(unsigned long saddr, | |
68 | unsigned long daddr, | |
69 | unsigned short len, | |
70 | unsigned short proto, | |
71 | __wsum sum) | |
72 | { | |
73 | return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum)); | |
74 | } | |
75 | ||
76 | #undef _HAVE_ARCH_IPV6_CSUM | |
77 | ||
78 | /* | |
79 | * Copy and checksum to user | |
80 | */ | |
81 | #define HAVE_CSUM_COPY_USER | |
82 | extern __wsum csum_and_copy_to_user(const void *src, void *dst, int len, | |
83 | __wsum sum, int *err_ptr); | |
84 | ||
85 | ||
86 | #endif /* _ASM_CHECKSUM_H */ |