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1da177e4 LT |
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); |
1da177e4 LT |
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); |
1da177e4 LT |
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 |
36 | extern __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); |
1da177e4 LT |
40 | |
41 | ||
42 | /* | |
43 | * Fold a partial checksum | |
44 | */ | |
45 | ||
db521083 | 46 | static inline __sum16 csum_fold(__wsum sum) |
1da177e4 LT |
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; |
1da177e4 LT |
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 |
67 | static inline __wsum |
68 | csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len, | |
69 | unsigned short proto, __wsum sum) | |
1da177e4 LT |
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 AV |
88 | static inline __sum16 |
89 | csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len, | |
90 | unsigned short proto, __wsum sum) | |
1da177e4 LT |
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 | 100 | extern __sum16 ip_compute_csum(const void *buff, int len); |
1da177e4 LT |
101 | |
102 | #endif /* _H8300_CHECKSUM_H */ |