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6192c1ea GU |
1 | #ifndef _M68K_CHECKSUM_H |
2 | #define _M68K_CHECKSUM_H | |
3 | ||
4 | #include <linux/in6.h> | |
5 | ||
7f73bafc GU |
6 | #ifdef CONFIG_GENERIC_CSUM |
7 | #include <asm-generic/checksum.h> | |
8 | #else | |
9 | ||
6192c1ea GU |
10 | /* |
11 | * computes the checksum of a memory block at buff, length len, | |
12 | * and adds in "sum" (32-bit) | |
13 | * | |
14 | * returns a 32-bit number suitable for feeding into itself | |
15 | * or csum_tcpudp_magic | |
16 | * | |
17 | * this function must be called with even lengths, except | |
18 | * for the last fragment, which may be odd | |
19 | * | |
20 | * it's best to have buff aligned on a 32-bit boundary | |
21 | */ | |
22 | __wsum csum_partial(const void *buff, int len, __wsum sum); | |
23 | ||
24 | /* | |
25 | * the same as csum_partial, but copies from src while it | |
26 | * checksums | |
27 | * | |
28 | * here even more important to align src and dst on a 32-bit (or even | |
29 | * better 64-bit) boundary | |
30 | */ | |
31 | ||
32 | extern __wsum csum_partial_copy_from_user(const void __user *src, | |
33 | void *dst, | |
34 | int len, __wsum sum, | |
35 | int *csum_err); | |
36 | ||
37 | extern __wsum csum_partial_copy_nocheck(const void *src, | |
38 | void *dst, int len, | |
39 | __wsum sum); | |
40 | ||
6192c1ea GU |
41 | /* |
42 | * This is a version of ip_fast_csum() optimized for IP headers, | |
43 | * which always checksum on 4 octet boundaries. | |
44 | */ | |
45 | static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) | |
46 | { | |
47 | unsigned int sum = 0; | |
48 | unsigned long tmp; | |
49 | ||
50 | __asm__ ("subqw #1,%2\n" | |
51 | "1:\t" | |
52 | "movel %1@+,%3\n\t" | |
53 | "addxl %3,%0\n\t" | |
54 | "dbra %2,1b\n\t" | |
55 | "movel %0,%3\n\t" | |
56 | "swap %3\n\t" | |
57 | "addxw %3,%0\n\t" | |
58 | "clrw %3\n\t" | |
59 | "addxw %3,%0\n\t" | |
60 | : "=d" (sum), "=&a" (iph), "=&d" (ihl), "=&d" (tmp) | |
61 | : "0" (sum), "1" (iph), "2" (ihl) | |
62 | : "memory"); | |
63 | return (__force __sum16)~sum; | |
64 | } | |
65 | ||
66 | static inline __sum16 csum_fold(__wsum sum) | |
67 | { | |
68 | unsigned int tmp = (__force u32)sum; | |
69 | ||
70 | __asm__("swap %1\n\t" | |
71 | "addw %1, %0\n\t" | |
72 | "clrw %1\n\t" | |
73 | "addxw %1, %0" | |
74 | : "=&d" (sum), "=&d" (tmp) | |
75 | : "0" (sum), "1" (tmp)); | |
76 | ||
77 | return (__force __sum16)~sum; | |
78 | } | |
79 | ||
6192c1ea GU |
80 | static inline __wsum |
81 | csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len, | |
82 | unsigned short proto, __wsum sum) | |
83 | { | |
84 | __asm__ ("addl %2,%0\n\t" | |
85 | "addxl %3,%0\n\t" | |
86 | "addxl %4,%0\n\t" | |
87 | "clrl %1\n\t" | |
88 | "addxl %1,%0" | |
89 | : "=&d" (sum), "=d" (saddr) | |
90 | : "g" (daddr), "1" (saddr), "d" (len + proto), | |
91 | "0" (sum)); | |
92 | return sum; | |
93 | } | |
94 | ||
95 | ||
96 | /* | |
97 | * computes the checksum of the TCP/UDP pseudo-header | |
98 | * returns a 16-bit checksum, already complemented | |
99 | */ | |
100 | static inline __sum16 | |
101 | csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len, | |
102 | unsigned short proto, __wsum sum) | |
103 | { | |
104 | return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); | |
105 | } | |
106 | ||
107 | /* | |
108 | * this routine is used for miscellaneous IP-like checksums, mainly | |
109 | * in icmp.c | |
110 | */ | |
111 | ||
112 | static inline __sum16 ip_compute_csum(const void *buff, int len) | |
113 | { | |
114 | return csum_fold (csum_partial(buff, len, 0)); | |
115 | } | |
116 | ||
117 | #define _HAVE_ARCH_IPV6_CSUM | |
118 | static __inline__ __sum16 | |
119 | csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr, | |
1e940829 | 120 | __u32 len, __u8 proto, __wsum sum) |
6192c1ea GU |
121 | { |
122 | register unsigned long tmp; | |
123 | __asm__("addl %2@,%0\n\t" | |
124 | "movel %2@(4),%1\n\t" | |
125 | "addxl %1,%0\n\t" | |
126 | "movel %2@(8),%1\n\t" | |
127 | "addxl %1,%0\n\t" | |
128 | "movel %2@(12),%1\n\t" | |
129 | "addxl %1,%0\n\t" | |
130 | "movel %3@,%1\n\t" | |
131 | "addxl %1,%0\n\t" | |
132 | "movel %3@(4),%1\n\t" | |
133 | "addxl %1,%0\n\t" | |
134 | "movel %3@(8),%1\n\t" | |
135 | "addxl %1,%0\n\t" | |
136 | "movel %3@(12),%1\n\t" | |
137 | "addxl %1,%0\n\t" | |
138 | "addxl %4,%0\n\t" | |
139 | "clrl %1\n\t" | |
140 | "addxl %1,%0" | |
141 | : "=&d" (sum), "=&d" (tmp) | |
142 | : "a" (saddr), "a" (daddr), "d" (len + proto), | |
143 | "0" (sum)); | |
144 | ||
145 | return csum_fold(sum); | |
146 | } | |
147 | ||
7f73bafc | 148 | #endif /* CONFIG_GENERIC_CSUM */ |
6192c1ea | 149 | #endif /* _M68K_CHECKSUM_H */ |