Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / arch / mn10300 / include / asm / checksum.h
blobc80df5b504acabc57c2bd5529e613f54cb4c7942
1 /* MN10300 Optimised checksumming code
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
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.
11 #ifndef _ASM_CHECKSUM_H
12 #define _ASM_CHECKSUM_H
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);
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);
28 static inline __sum16 csum_fold(__wsum sum)
30 asm(
31 " add %1,%0 \n"
32 " addc 0xffff,%0 \n"
33 : "=r" (sum)
34 : "r" (sum << 16), "0" (sum & 0xffff0000)
35 : "cc"
37 return (~sum) >> 16;
40 static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
41 __u32 len, __u8 proto,
42 __wsum sum)
44 __wsum tmp = (__wsum)((len + proto) << 8);
46 asm(
47 " add %1,%0 \n"
48 " addc %2,%0 \n"
49 " addc %3,%0 \n"
50 " addc 0,%0 \n"
51 : "=r" (sum)
52 : "r" (daddr), "r"(saddr), "r"(tmp), "0"(sum)
53 : "cc"
55 return sum;
59 * computes the checksum of the TCP/UDP pseudo-header
60 * returns a 16-bit checksum, already complemented
62 static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
63 __u32 len, __u8 proto,
64 __wsum sum)
66 return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
69 #undef _HAVE_ARCH_IPV6_CSUM
72 * Copy and checksum to user
74 #define HAVE_CSUM_COPY_USER
75 extern __wsum csum_and_copy_to_user(const void *src, void *dst, int len,
76 __wsum sum, int *err_ptr);
79 #endif /* _ASM_CHECKSUM_H */