Merge branch 'next' into for-linus
[linux-block.git] / arch / h8300 / include / asm / checksum.h
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1#ifndef _H8300_CHECKSUM_H
2#define _H8300_CHECKSUM_H
3
4/*
5 * computes the checksum of a memory block at buff, length len,
6 * and adds in "sum" (32-bit)
7 *
8 * returns a 32-bit number suitable for feeding into itself
9 * or csum_tcpudp_magic
10 *
11 * this function must be called with even lengths, except
12 * for the last fragment, which may be odd
13 *
14 * it's best to have buff aligned on a 32-bit boundary
15 */
db521083 16__wsum csum_partial(const void *buff, int len, __wsum sum);
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17
18/*
19 * the same as csum_partial, but copies from src while it
20 * checksums
21 *
22 * here even more important to align src and dst on a 32-bit (or even
23 * better 64-bit) boundary
24 */
25
db521083 26__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum);
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27
28
29/*
30 * the same as csum_partial_copy, but copies from user space.
31 *
32 * here even more important to align src and dst on a 32-bit (or even
33 * better 64-bit) boundary
34 */
35
db521083
AV
36extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
37 int len, __wsum sum, int *csum_err);
1da177e4 38
db521083 39__sum16 ip_fast_csum(const void *iph, unsigned int ihl);
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40
41
42/*
43 * Fold a partial checksum
44 */
45
db521083 46static inline __sum16 csum_fold(__wsum sum)
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47{
48 __asm__("mov.l %0,er0\n\t"
49 "add.w e0,r0\n\t"
50 "xor.w e0,e0\n\t"
51 "rotxl.w e0\n\t"
52 "add.w e0,r0\n\t"
53 "sub.w e0,e0\n\t"
54 "mov.l er0,%0"
55 : "=r"(sum)
56 : "0"(sum)
57 : "er0");
db521083 58 return (__force __sum16)~sum;
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59}
60
61
62/*
63 * computes the checksum of the TCP/UDP pseudo-header
64 * returns a 16-bit checksum, already complemented
65 */
66
db521083
AV
67static inline __wsum
68csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
69 unsigned short proto, __wsum sum)
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70{
71 __asm__ ("sub.l er0,er0\n\t"
72 "add.l %2,%0\n\t"
73 "addx #0,r0l\n\t"
74 "add.l %3,%0\n\t"
75 "addx #0,r0l\n\t"
76 "add.l %4,%0\n\t"
77 "addx #0,r0l\n\t"
78 "add.l er0,%0\n\t"
79 "bcc 1f\n\t"
80 "inc.l #1,%0\n"
81 "1:"
82 : "=&r" (sum)
83 : "0" (sum), "r" (daddr), "r" (saddr), "r" (len + proto)
84 :"er0");
85 return sum;
86}
87
db521083
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88static inline __sum16
89csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len,
90 unsigned short proto, __wsum sum)
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91{
92 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
93}
94
95/*
96 * this routine is used for miscellaneous IP-like checksums, mainly
97 * in icmp.c
98 */
99
db521083 100extern __sum16 ip_compute_csum(const void *buff, int len);
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101
102#endif /* _H8300_CHECKSUM_H */