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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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 */
Al Viro59ed05a2006-11-14 21:17:56 -080018__wsum csum_partial(const void *buff, int len, __wsum sum);
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
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
Al Viro59ed05a2006-11-14 21:17:56 -080028__wsum csum_partial_copy_nocheck(const void *src, void *dst,
29 int len, __wsum sum);
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
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
Al Viro59ed05a2006-11-14 21:17:56 -080039extern __wsum csum_partial_copy_from_user(const void __user *src,
40 void *dst, int len, __wsum sum, int *csum_err);
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Al Viro59ed05a2006-11-14 21:17:56 -080042__sum16 ip_fast_csum(const void *iph, unsigned int ihl);
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
44/*
45 * Fold a partial checksum
46 */
47
Al Viro59ed05a2006-11-14 21:17:56 -080048static inline __sum16 csum_fold(__wsum sum)
Linus Torvalds1da177e2005-04-16 15:20:36 -070049{
Al Viro59ed05a2006-11-14 21:17:56 -080050 unsigned int tmp = (__force u32)sum;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#ifdef CONFIG_COLDFIRE
Al Viro59ed05a2006-11-14 21:17:56 -080052 tmp = (tmp & 0xffff) + (tmp >> 16);
53 tmp = (tmp & 0xffff) + (tmp >> 16);
54 return (__force __sum16)~tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#else
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 __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));
Al Viro59ed05a2006-11-14 21:17:56 -080062 return (__force __sum16)~sum;
Linus Torvalds1da177e2005-04-16 15:20:36 -070063#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070064}
65
66
67/*
68 * computes the checksum of the TCP/UDP pseudo-header
69 * returns a 16-bit checksum, already complemented
70 */
71
Al Viro59ed05a2006-11-14 21:17:56 -080072static inline __wsum
73csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
74 unsigned short proto, __wsum sum)
Linus Torvalds1da177e2005-04-16 15:20:36 -070075{
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
Al Viro59ed05a2006-11-14 21:17:56 -080087static inline __sum16
88csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len,
89 unsigned short proto, __wsum sum)
Linus Torvalds1da177e2005-04-16 15:20:36 -070090{
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
Al Viro59ed05a2006-11-14 21:17:56 -080099extern __sum16 ip_compute_csum(const void *buff, int len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
101#define _HAVE_ARCH_IPV6_CSUM
Al Viro59ed05a2006-11-14 21:17:56 -0800102static __inline__ __sum16
103csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr,
104 __u32 len, unsigned short proto, __wsum sum)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105{
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 */