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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-m68knommu/checksum.h
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'include/asm-m68knommu/checksum.h')
-rw-r--r--include/asm-m68knommu/checksum.h133
1 files changed, 133 insertions, 0 deletions
diff --git a/include/asm-m68knommu/checksum.h b/include/asm-m68knommu/checksum.h
new file mode 100644
index 000000000000..92cf102c2534
--- /dev/null
+++ b/include/asm-m68knommu/checksum.h
@@ -0,0 +1,133 @@
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 */
18unsigned int csum_partial(const unsigned char * buff, int len, unsigned int 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
28unsigned int csum_partial_copy(const char *src, char *dst, int len, int sum);
29
30
31/*
32 * the same as csum_partial_copy, but copies from user space.
33 *
34 * here even more important to align src and dst on a 32-bit (or even
35 * better 64-bit) boundary
36 */
37
38extern unsigned int csum_partial_copy_from_user(const char *src, char *dst,
39 int len, int sum, int *csum_err);
40
41#define csum_partial_copy_nocheck(src, dst, len, sum) \
42 csum_partial_copy((src), (dst), (len), (sum))
43
44unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl);
45
46/*
47 * Fold a partial checksum
48 */
49
50static inline unsigned int csum_fold(unsigned int sum)
51{
52#ifdef CONFIG_COLDFIRE
53 sum = (sum & 0xffff) + (sum >> 16);
54 sum = (sum & 0xffff) + (sum >> 16);
55#else
56 unsigned int tmp = sum;
57 __asm__("swap %1\n\t"
58 "addw %1, %0\n\t"
59 "clrw %1\n\t"
60 "addxw %1, %0"
61 : "=&d" (sum), "=&d" (tmp)
62 : "0" (sum), "1" (sum));
63#endif
64 return ~sum;
65}
66
67
68/*
69 * computes the checksum of the TCP/UDP pseudo-header
70 * returns a 16-bit checksum, already complemented
71 */
72
73static inline unsigned int
74csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len,
75 unsigned short proto, unsigned int sum)
76{
77 __asm__ ("addl %1,%0\n\t"
78 "addxl %4,%0\n\t"
79 "addxl %5,%0\n\t"
80 "clrl %1\n\t"
81 "addxl %1,%0"
82 : "=&d" (sum), "=&d" (saddr)
83 : "0" (daddr), "1" (saddr), "d" (len + proto),
84 "d"(sum));
85 return sum;
86}
87
88static inline unsigned short int
89csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len,
90 unsigned short proto, unsigned int 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 unsigned short ip_compute_csum(const unsigned char * buff, int len);
101
102#define _HAVE_ARCH_IPV6_CSUM
103static __inline__ unsigned short int
104csum_ipv6_magic(struct in6_addr *saddr, struct in6_addr *daddr,
105 __u32 len, unsigned short proto, unsigned int sum)
106{
107 register unsigned long tmp;
108 __asm__("addl %2@,%0\n\t"
109 "movel %2@(4),%1\n\t"
110 "addxl %1,%0\n\t"
111 "movel %2@(8),%1\n\t"
112 "addxl %1,%0\n\t"
113 "movel %2@(12),%1\n\t"
114 "addxl %1,%0\n\t"
115 "movel %3@,%1\n\t"
116 "addxl %1,%0\n\t"
117 "movel %3@(4),%1\n\t"
118 "addxl %1,%0\n\t"
119 "movel %3@(8),%1\n\t"
120 "addxl %1,%0\n\t"
121 "movel %3@(12),%1\n\t"
122 "addxl %1,%0\n\t"
123 "addxl %4,%0\n\t"
124 "clrl %1\n\t"
125 "addxl %1,%0"
126 : "=&d" (sum), "=&d" (tmp)
127 : "a" (saddr), "a" (daddr), "d" (len + proto),
128 "0" (sum));
129
130 return csum_fold(sum);
131}
132
133#endif /* _M68K_CHECKSUM_H */