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__wsum csum_partial(const void *buff, int len, __wsum 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__wsum csum_partial_copy_nocheck(const void *src, void *dst,
29	int len, __wsum sum);
30
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
39extern __wsum csum_partial_copy_from_user(const void __user *src,
40	void *dst, int len, __wsum sum, int *csum_err);
41
42__sum16 ip_fast_csum(const void *iph, unsigned int ihl);
43
44/*
45 *	Fold a partial checksum
46 */
47
48static inline __sum16 csum_fold(__wsum sum)
49{
50	unsigned int tmp = (__force u32)sum;
51#ifdef CONFIG_COLDFIRE
52	tmp = (tmp & 0xffff) + (tmp >> 16);
53	tmp = (tmp & 0xffff) + (tmp >> 16);
54	return (__force __sum16)~tmp;
55#else
56	__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));
62	return (__force __sum16)~sum;
63#endif
64}
65
66
67/*
68 * computes the checksum of the TCP/UDP pseudo-header
69 * returns a 16-bit checksum, already complemented
70 */
71
72static inline __wsum
73csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
74		  unsigned short proto, __wsum sum)
75{
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
87static inline __sum16
88csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len,
89		  unsigned short proto, __wsum sum)
90{
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
99extern __sum16 ip_compute_csum(const void *buff, int len);
100
101#define _HAVE_ARCH_IPV6_CSUM
102static __inline__ __sum16
103csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr,
104		__u32 len, unsigned short proto, __wsum sum)
105{
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 */
133