diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-m68k/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-m68k/checksum.h')
-rw-r--r-- | include/asm-m68k/checksum.h | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/include/asm-m68k/checksum.h b/include/asm-m68k/checksum.h new file mode 100644 index 000000000000..78860c20db01 --- /dev/null +++ b/include/asm-m68k/checksum.h | |||
@@ -0,0 +1,150 @@ | |||
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 | unsigned 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 | |||
28 | extern unsigned int csum_partial_copy_from_user(const unsigned char *src, | ||
29 | unsigned char *dst, | ||
30 | int len, int sum, | ||
31 | int *csum_err); | ||
32 | |||
33 | extern unsigned int csum_partial_copy_nocheck(const unsigned char *src, | ||
34 | unsigned char *dst, int len, | ||
35 | int sum); | ||
36 | |||
37 | /* | ||
38 | * This is a version of ip_compute_csum() optimized for IP headers, | ||
39 | * which always checksum on 4 octet boundaries. | ||
40 | * | ||
41 | */ | ||
42 | static inline unsigned short | ||
43 | ip_fast_csum(unsigned char *iph, unsigned int ihl) | ||
44 | { | ||
45 | unsigned int sum = 0; | ||
46 | unsigned long tmp; | ||
47 | |||
48 | __asm__ ("subqw #1,%2\n" | ||
49 | "1:\t" | ||
50 | "movel %1@+,%3\n\t" | ||
51 | "addxl %3,%0\n\t" | ||
52 | "dbra %2,1b\n\t" | ||
53 | "movel %0,%3\n\t" | ||
54 | "swap %3\n\t" | ||
55 | "addxw %3,%0\n\t" | ||
56 | "clrw %3\n\t" | ||
57 | "addxw %3,%0\n\t" | ||
58 | : "=d" (sum), "=&a" (iph), "=&d" (ihl), "=&d" (tmp) | ||
59 | : "0" (sum), "1" (iph), "2" (ihl) | ||
60 | : "memory"); | ||
61 | return ~sum; | ||
62 | } | ||
63 | |||
64 | /* | ||
65 | * Fold a partial checksum | ||
66 | */ | ||
67 | |||
68 | static inline unsigned int csum_fold(unsigned int sum) | ||
69 | { | ||
70 | unsigned int tmp = sum; | ||
71 | __asm__("swap %1\n\t" | ||
72 | "addw %1, %0\n\t" | ||
73 | "clrw %1\n\t" | ||
74 | "addxw %1, %0" | ||
75 | : "=&d" (sum), "=&d" (tmp) | ||
76 | : "0" (sum), "1" (tmp)); | ||
77 | return ~sum; | ||
78 | } | ||
79 | |||
80 | |||
81 | static inline unsigned int | ||
82 | csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len, | ||
83 | unsigned short proto, unsigned int sum) | ||
84 | { | ||
85 | __asm__ ("addl %2,%0\n\t" | ||
86 | "addxl %3,%0\n\t" | ||
87 | "addxl %4,%0\n\t" | ||
88 | "clrl %1\n\t" | ||
89 | "addxl %1,%0" | ||
90 | : "=&d" (sum), "=d" (saddr) | ||
91 | : "g" (daddr), "1" (saddr), "d" (len + proto), | ||
92 | "0" (sum)); | ||
93 | return sum; | ||
94 | } | ||
95 | |||
96 | |||
97 | /* | ||
98 | * computes the checksum of the TCP/UDP pseudo-header | ||
99 | * returns a 16-bit checksum, already complemented | ||
100 | */ | ||
101 | static inline unsigned short int | ||
102 | csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len, | ||
103 | unsigned short proto, unsigned int sum) | ||
104 | { | ||
105 | return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); | ||
106 | } | ||
107 | |||
108 | /* | ||
109 | * this routine is used for miscellaneous IP-like checksums, mainly | ||
110 | * in icmp.c | ||
111 | */ | ||
112 | |||
113 | static inline unsigned short | ||
114 | ip_compute_csum(unsigned char * buff, int len) | ||
115 | { | ||
116 | return csum_fold (csum_partial(buff, len, 0)); | ||
117 | } | ||
118 | |||
119 | #define _HAVE_ARCH_IPV6_CSUM | ||
120 | static __inline__ unsigned short int | ||
121 | csum_ipv6_magic(struct in6_addr *saddr, struct in6_addr *daddr, | ||
122 | __u32 len, unsigned short proto, unsigned int sum) | ||
123 | { | ||
124 | register unsigned long tmp; | ||
125 | __asm__("addl %2@,%0\n\t" | ||
126 | "movel %2@(4),%1\n\t" | ||
127 | "addxl %1,%0\n\t" | ||
128 | "movel %2@(8),%1\n\t" | ||
129 | "addxl %1,%0\n\t" | ||
130 | "movel %2@(12),%1\n\t" | ||
131 | "addxl %1,%0\n\t" | ||
132 | "movel %3@,%1\n\t" | ||
133 | "addxl %1,%0\n\t" | ||
134 | "movel %3@(4),%1\n\t" | ||
135 | "addxl %1,%0\n\t" | ||
136 | "movel %3@(8),%1\n\t" | ||
137 | "addxl %1,%0\n\t" | ||
138 | "movel %3@(12),%1\n\t" | ||
139 | "addxl %1,%0\n\t" | ||
140 | "addxl %4,%0\n\t" | ||
141 | "clrl %1\n\t" | ||
142 | "addxl %1,%0" | ||
143 | : "=&d" (sum), "=&d" (tmp) | ||
144 | : "a" (saddr), "a" (daddr), "d" (len + proto), | ||
145 | "0" (sum)); | ||
146 | |||
147 | return csum_fold(sum); | ||
148 | } | ||
149 | |||
150 | #endif /* _M68K_CHECKSUM_H */ | ||