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1da177e4 LT |
1 | #ifndef _M68K_CHECKSUM_H |
2 | #define _M68K_CHECKSUM_H | |
3 | ||
4 | #include <linux/in6.h> | |
5 | ||
6 | /* | |
7 | * computes the checksum of a memory block at buff, length len, | |
8 | * and adds in "sum" (32-bit) | |
9 | * | |
10 | * returns a 32-bit number suitable for feeding into itself | |
11 | * or csum_tcpudp_magic | |
12 | * | |
13 | * this function must be called with even lengths, except | |
14 | * for the last fragment, which may be odd | |
15 | * | |
16 | * it's best to have buff aligned on a 32-bit boundary | |
17 | */ | |
59ed05a7 | 18 | __wsum csum_partial(const void *buff, int len, __wsum sum); |
1da177e4 LT |
19 | |
20 | /* | |
21 | * the same as csum_partial, but copies from src while it | |
22 | * checksums | |
23 | * | |
24 | * here even more important to align src and dst on a 32-bit (or even | |
25 | * better 64-bit) boundary | |
26 | */ | |
27 | ||
59ed05a7 AV |
28 | __wsum csum_partial_copy_nocheck(const void *src, void *dst, |
29 | int len, __wsum sum); | |
1da177e4 LT |
30 | |
31 | ||
32 | /* | |
33 | * the same as csum_partial_copy, but copies from user space. | |
34 | * | |
35 | * here even more important to align src and dst on a 32-bit (or even | |
36 | * better 64-bit) boundary | |
37 | */ | |
38 | ||
59ed05a7 AV |
39 | extern __wsum csum_partial_copy_from_user(const void __user *src, |
40 | void *dst, int len, __wsum sum, int *csum_err); | |
1da177e4 | 41 | |
59ed05a7 | 42 | __sum16 ip_fast_csum(const void *iph, unsigned int ihl); |
1da177e4 LT |
43 | |
44 | /* | |
45 | * Fold a partial checksum | |
46 | */ | |
47 | ||
59ed05a7 | 48 | static inline __sum16 csum_fold(__wsum sum) |
1da177e4 | 49 | { |
59ed05a7 | 50 | unsigned int tmp = (__force u32)sum; |
1da177e4 | 51 | #ifdef CONFIG_COLDFIRE |
59ed05a7 AV |
52 | tmp = (tmp & 0xffff) + (tmp >> 16); |
53 | tmp = (tmp & 0xffff) + (tmp >> 16); | |
54 | return (__force __sum16)~tmp; | |
1da177e4 | 55 | #else |
1da177e4 LT |
56 | __asm__("swap %1\n\t" |
57 | "addw %1, %0\n\t" | |
58 | "clrw %1\n\t" | |
59 | "addxw %1, %0" | |
60 | : "=&d" (sum), "=&d" (tmp) | |
61 | : "0" (sum), "1" (sum)); | |
59ed05a7 | 62 | return (__force __sum16)~sum; |
1da177e4 | 63 | #endif |
1da177e4 LT |
64 | } |
65 | ||
66 | ||
67 | /* | |
68 | * computes the checksum of the TCP/UDP pseudo-header | |
69 | * returns a 16-bit checksum, already complemented | |
70 | */ | |
71 | ||
59ed05a7 AV |
72 | static inline __wsum |
73 | csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len, | |
74 | unsigned short proto, __wsum sum) | |
1da177e4 LT |
75 | { |
76 | __asm__ ("addl %1,%0\n\t" | |
77 | "addxl %4,%0\n\t" | |
78 | "addxl %5,%0\n\t" | |
79 | "clrl %1\n\t" | |
80 | "addxl %1,%0" | |
81 | : "=&d" (sum), "=&d" (saddr) | |
82 | : "0" (daddr), "1" (saddr), "d" (len + proto), | |
83 | "d"(sum)); | |
84 | return sum; | |
85 | } | |
86 | ||
59ed05a7 AV |
87 | static inline __sum16 |
88 | csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len, | |
89 | unsigned short proto, __wsum sum) | |
1da177e4 LT |
90 | { |
91 | return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); | |
92 | } | |
93 | ||
94 | /* | |
95 | * this routine is used for miscellaneous IP-like checksums, mainly | |
96 | * in icmp.c | |
97 | */ | |
98 | ||
59ed05a7 | 99 | extern __sum16 ip_compute_csum(const void *buff, int len); |
1da177e4 LT |
100 | |
101 | #define _HAVE_ARCH_IPV6_CSUM | |
59ed05a7 AV |
102 | static __inline__ __sum16 |
103 | csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr, | |
104 | __u32 len, unsigned short proto, __wsum sum) | |
1da177e4 LT |
105 | { |
106 | register unsigned long tmp; | |
107 | __asm__("addl %2@,%0\n\t" | |
108 | "movel %2@(4),%1\n\t" | |
109 | "addxl %1,%0\n\t" | |
110 | "movel %2@(8),%1\n\t" | |
111 | "addxl %1,%0\n\t" | |
112 | "movel %2@(12),%1\n\t" | |
113 | "addxl %1,%0\n\t" | |
114 | "movel %3@,%1\n\t" | |
115 | "addxl %1,%0\n\t" | |
116 | "movel %3@(4),%1\n\t" | |
117 | "addxl %1,%0\n\t" | |
118 | "movel %3@(8),%1\n\t" | |
119 | "addxl %1,%0\n\t" | |
120 | "movel %3@(12),%1\n\t" | |
121 | "addxl %1,%0\n\t" | |
122 | "addxl %4,%0\n\t" | |
123 | "clrl %1\n\t" | |
124 | "addxl %1,%0" | |
125 | : "=&d" (sum), "=&d" (tmp) | |
126 | : "a" (saddr), "a" (daddr), "d" (len + proto), | |
127 | "0" (sum)); | |
128 | ||
129 | return csum_fold(sum); | |
130 | } | |
131 | ||
132 | #endif /* _M68K_CHECKSUM_H */ |