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 __wsum csum_partial(const void *buff, int len, __wsum 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 __wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum 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 __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
37 int len, __wsum sum, int *csum_err);
38
39 __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
40
41
42 /*
43 * Fold a partial checksum
44 */
45
csum_fold(__wsum sum)46 static inline __sum16 csum_fold(__wsum sum)
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");
58 return (__force __sum16)~sum;
59 }
60
61
62 /*
63 * computes the checksum of the TCP/UDP pseudo-header
64 * returns a 16-bit checksum, already complemented
65 */
66
67 static inline __wsum
csum_tcpudp_nofold(__be32 saddr,__be32 daddr,unsigned short len,unsigned short proto,__wsum sum)68 csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
69 unsigned short proto, __wsum sum)
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
88 static inline __sum16
csum_tcpudp_magic(__be32 saddr,__be32 daddr,unsigned short len,unsigned short proto,__wsum sum)89 csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len,
90 unsigned short proto, __wsum 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 __sum16 ip_compute_csum(const void *buff, int len);
101
102 #endif /* _H8300_CHECKSUM_H */
103