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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 | */ | |
16 | unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum); | |
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 | ||
26 | unsigned int csum_partial_copy(const char *src, char *dst, int len, int sum); | |
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 | ||
36 | extern unsigned int csum_partial_copy_from_user(const char *src, char *dst, | |
37 | int len, int sum, int *csum_err); | |
38 | ||
39 | #define csum_partial_copy_nocheck(src, dst, len, sum) \ | |
40 | csum_partial_copy((src), (dst), (len), (sum)) | |
41 | ||
42 | unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl); | |
43 | ||
44 | ||
45 | /* | |
46 | * Fold a partial checksum | |
47 | */ | |
48 | ||
49 | static inline unsigned int csum_fold(unsigned int sum) | |
50 | { | |
51 | __asm__("mov.l %0,er0\n\t" | |
52 | "add.w e0,r0\n\t" | |
53 | "xor.w e0,e0\n\t" | |
54 | "rotxl.w e0\n\t" | |
55 | "add.w e0,r0\n\t" | |
56 | "sub.w e0,e0\n\t" | |
57 | "mov.l er0,%0" | |
58 | : "=r"(sum) | |
59 | : "0"(sum) | |
60 | : "er0"); | |
61 | return ~sum; | |
62 | } | |
63 | ||
64 | ||
65 | /* | |
66 | * computes the checksum of the TCP/UDP pseudo-header | |
67 | * returns a 16-bit checksum, already complemented | |
68 | */ | |
69 | ||
70 | static inline unsigned int | |
71 | csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len, | |
72 | unsigned short proto, unsigned int sum) | |
73 | { | |
74 | __asm__ ("sub.l er0,er0\n\t" | |
75 | "add.l %2,%0\n\t" | |
76 | "addx #0,r0l\n\t" | |
77 | "add.l %3,%0\n\t" | |
78 | "addx #0,r0l\n\t" | |
79 | "add.l %4,%0\n\t" | |
80 | "addx #0,r0l\n\t" | |
81 | "add.l er0,%0\n\t" | |
82 | "bcc 1f\n\t" | |
83 | "inc.l #1,%0\n" | |
84 | "1:" | |
85 | : "=&r" (sum) | |
86 | : "0" (sum), "r" (daddr), "r" (saddr), "r" (len + proto) | |
87 | :"er0"); | |
88 | return sum; | |
89 | } | |
90 | ||
91 | static inline unsigned short int | |
92 | csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len, | |
93 | unsigned short proto, unsigned int sum) | |
94 | { | |
95 | return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); | |
96 | } | |
97 | ||
98 | /* | |
99 | * this routine is used for miscellaneous IP-like checksums, mainly | |
100 | * in icmp.c | |
101 | */ | |
102 | ||
103 | extern unsigned short ip_compute_csum(const unsigned char * buff, int len); | |
104 | ||
105 | #endif /* _H8300_CHECKSUM_H */ |