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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 | */ | |
18 | unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum); | |
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 | ||
28 | unsigned int csum_partial_copy(const char *src, char *dst, int len, int sum); | |
29 | ||
30 | ||
31 | /* | |
32 | * the same as csum_partial_copy, but copies from user space. | |
33 | * | |
34 | * here even more important to align src and dst on a 32-bit (or even | |
35 | * better 64-bit) boundary | |
36 | */ | |
37 | ||
38 | extern unsigned int csum_partial_copy_from_user(const char *src, char *dst, | |
39 | int len, int sum, int *csum_err); | |
40 | ||
41 | #define csum_partial_copy_nocheck(src, dst, len, sum) \ | |
42 | csum_partial_copy((src), (dst), (len), (sum)) | |
43 | ||
44 | unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl); | |
45 | ||
46 | /* | |
47 | * Fold a partial checksum | |
48 | */ | |
49 | ||
50 | static inline unsigned int csum_fold(unsigned int sum) | |
51 | { | |
52 | #ifdef CONFIG_COLDFIRE | |
53 | sum = (sum & 0xffff) + (sum >> 16); | |
54 | sum = (sum & 0xffff) + (sum >> 16); | |
55 | #else | |
56 | unsigned int tmp = sum; | |
57 | __asm__("swap %1\n\t" | |
58 | "addw %1, %0\n\t" | |
59 | "clrw %1\n\t" | |
60 | "addxw %1, %0" | |
61 | : "=&d" (sum), "=&d" (tmp) | |
62 | : "0" (sum), "1" (sum)); | |
63 | #endif | |
64 | return ~sum; | |
65 | } | |
66 | ||
67 | ||
68 | /* | |
69 | * computes the checksum of the TCP/UDP pseudo-header | |
70 | * returns a 16-bit checksum, already complemented | |
71 | */ | |
72 | ||
73 | static inline unsigned int | |
74 | csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len, | |
75 | unsigned short proto, unsigned int sum) | |
76 | { | |
77 | __asm__ ("addl %1,%0\n\t" | |
78 | "addxl %4,%0\n\t" | |
79 | "addxl %5,%0\n\t" | |
80 | "clrl %1\n\t" | |
81 | "addxl %1,%0" | |
82 | : "=&d" (sum), "=&d" (saddr) | |
83 | : "0" (daddr), "1" (saddr), "d" (len + proto), | |
84 | "d"(sum)); | |
85 | return sum; | |
86 | } | |
87 | ||
88 | static inline unsigned short int | |
89 | csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len, | |
90 | unsigned short proto, unsigned int sum) | |
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 | ||
100 | extern unsigned short ip_compute_csum(const unsigned char * buff, int len); | |
101 | ||
102 | #define _HAVE_ARCH_IPV6_CSUM | |
103 | static __inline__ unsigned short int | |
104 | csum_ipv6_magic(struct in6_addr *saddr, struct in6_addr *daddr, | |
105 | __u32 len, unsigned short proto, unsigned int sum) | |
106 | { | |
107 | register unsigned long tmp; | |
108 | __asm__("addl %2@,%0\n\t" | |
109 | "movel %2@(4),%1\n\t" | |
110 | "addxl %1,%0\n\t" | |
111 | "movel %2@(8),%1\n\t" | |
112 | "addxl %1,%0\n\t" | |
113 | "movel %2@(12),%1\n\t" | |
114 | "addxl %1,%0\n\t" | |
115 | "movel %3@,%1\n\t" | |
116 | "addxl %1,%0\n\t" | |
117 | "movel %3@(4),%1\n\t" | |
118 | "addxl %1,%0\n\t" | |
119 | "movel %3@(8),%1\n\t" | |
120 | "addxl %1,%0\n\t" | |
121 | "movel %3@(12),%1\n\t" | |
122 | "addxl %1,%0\n\t" | |
123 | "addxl %4,%0\n\t" | |
124 | "clrl %1\n\t" | |
125 | "addxl %1,%0" | |
126 | : "=&d" (sum), "=&d" (tmp) | |
127 | : "a" (saddr), "a" (daddr), "d" (len + proto), | |
128 | "0" (sum)); | |
129 | ||
130 | return csum_fold(sum); | |
131 | } | |
132 | ||
133 | #endif /* _M68K_CHECKSUM_H */ |