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
36extern __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
46static 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
67static inline __wsum
68csum_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
88static inline __sum16
89csum_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
100extern __sum16 ip_compute_csum(const void *buff, int len);
101
102#endif /* _H8300_CHECKSUM_H */
103