diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
---|---|---|
committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-frv/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-frv/checksum.h')
-rw-r--r-- | include/asm-frv/checksum.h | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/include/asm-frv/checksum.h b/include/asm-frv/checksum.h new file mode 100644 index 000000000000..10236f6802db --- /dev/null +++ b/include/asm-frv/checksum.h | |||
@@ -0,0 +1,183 @@ | |||
1 | /* checksum.h: FRV checksumming | ||
2 | * | ||
3 | * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved. | ||
4 | * Written by David Howells (dhowells@redhat.com) | ||
5 | * | ||
6 | * This program is free software; you can redistribute it and/or | ||
7 | * modify it under the terms of the GNU General Public License | ||
8 | * as published by the Free Software Foundation; either version | ||
9 | * 2 of the License, or (at your option) any later version. | ||
10 | */ | ||
11 | |||
12 | #ifndef _ASM_CHECKSUM_H | ||
13 | #define _ASM_CHECKSUM_H | ||
14 | |||
15 | #include <linux/in6.h> | ||
16 | |||
17 | /* | ||
18 | * computes the checksum of a memory block at buff, length len, | ||
19 | * and adds in "sum" (32-bit) | ||
20 | * | ||
21 | * returns a 32-bit number suitable for feeding into itself | ||
22 | * or csum_tcpudp_magic | ||
23 | * | ||
24 | * this function must be called with even lengths, except | ||
25 | * for the last fragment, which may be odd | ||
26 | * | ||
27 | * it's best to have buff aligned on a 32-bit boundary | ||
28 | */ | ||
29 | unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum); | ||
30 | |||
31 | /* | ||
32 | * the same as csum_partial, but copies from src while it | ||
33 | * checksums | ||
34 | * | ||
35 | * here even more important to align src and dst on a 32-bit (or even | ||
36 | * better 64-bit) boundary | ||
37 | */ | ||
38 | unsigned int csum_partial_copy(const char *src, char *dst, int len, int sum); | ||
39 | |||
40 | /* | ||
41 | * the same as csum_partial_copy, but copies from user space. | ||
42 | * | ||
43 | * here even more important to align src and dst on a 32-bit (or even | ||
44 | * better 64-bit) boundary | ||
45 | */ | ||
46 | extern unsigned int csum_partial_copy_from_user(const char *src, char *dst, | ||
47 | int len, int sum, int *csum_err); | ||
48 | |||
49 | #define csum_partial_copy_nocheck(src, dst, len, sum) \ | ||
50 | csum_partial_copy((src), (dst), (len), (sum)) | ||
51 | |||
52 | /* | ||
53 | * This is a version of ip_compute_csum() optimized for IP headers, | ||
54 | * which always checksum on 4 octet boundaries. | ||
55 | * | ||
56 | */ | ||
57 | static inline | ||
58 | unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl) | ||
59 | { | ||
60 | unsigned int tmp, inc, sum = 0; | ||
61 | |||
62 | asm(" addcc gr0,gr0,gr0,icc0\n" /* clear icc0.C */ | ||
63 | " subi %1,#4,%1 \n" | ||
64 | "0: \n" | ||
65 | " ldu.p @(%1,%3),%4 \n" | ||
66 | " subicc %2,#1,%2,icc1 \n" | ||
67 | " addxcc.p %4,%0,%0,icc0 \n" | ||
68 | " bhi icc1,#2,0b \n" | ||
69 | |||
70 | /* fold the 33-bit result into 16-bits */ | ||
71 | " addxcc gr0,%0,%0,icc0 \n" | ||
72 | " srli %0,#16,%1 \n" | ||
73 | " sethi #0,%0 \n" | ||
74 | " add %1,%0,%0 \n" | ||
75 | " srli %0,#16,%1 \n" | ||
76 | " add %1,%0,%0 \n" | ||
77 | |||
78 | : "=r" (sum), "=r" (iph), "=r" (ihl), "=r" (inc), "=&r"(tmp) | ||
79 | : "0" (sum), "1" (iph), "2" (ihl), "3" (4), | ||
80 | "m"(*(volatile struct { int _[100]; } *)iph) | ||
81 | : "icc0", "icc1" | ||
82 | ); | ||
83 | |||
84 | return ~sum; | ||
85 | } | ||
86 | |||
87 | /* | ||
88 | * Fold a partial checksum | ||
89 | */ | ||
90 | static inline unsigned int csum_fold(unsigned int sum) | ||
91 | { | ||
92 | unsigned int tmp; | ||
93 | |||
94 | asm(" srli %0,#16,%1 \n" | ||
95 | " sethi #0,%0 \n" | ||
96 | " add %1,%0,%0 \n" | ||
97 | " srli %0,#16,%1 \n" | ||
98 | " add %1,%0,%0 \n" | ||
99 | : "=r"(sum), "=&r"(tmp) | ||
100 | : "0"(sum) | ||
101 | ); | ||
102 | |||
103 | return ~sum; | ||
104 | } | ||
105 | |||
106 | /* | ||
107 | * computes the checksum of the TCP/UDP pseudo-header | ||
108 | * returns a 16-bit checksum, already complemented | ||
109 | */ | ||
110 | static inline unsigned int | ||
111 | csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len, | ||
112 | unsigned short proto, unsigned int sum) | ||
113 | { | ||
114 | asm(" addcc %1,%0,%0,icc0 \n" | ||
115 | " addxcc %2,%0,%0,icc0 \n" | ||
116 | " addxcc %3,%0,%0,icc0 \n" | ||
117 | " addxcc gr0,%0,%0,icc0 \n" | ||
118 | : "=r" (sum) | ||
119 | : "r" (daddr), "r" (saddr), "r" (len + proto), "0"(sum) | ||
120 | : "icc0" | ||
121 | ); | ||
122 | return sum; | ||
123 | } | ||
124 | |||
125 | static inline unsigned short int | ||
126 | csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len, | ||
127 | unsigned short proto, unsigned int sum) | ||
128 | { | ||
129 | return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); | ||
130 | } | ||
131 | |||
132 | /* | ||
133 | * this routine is used for miscellaneous IP-like checksums, mainly | ||
134 | * in icmp.c | ||
135 | */ | ||
136 | extern unsigned short ip_compute_csum(const unsigned char * buff, int len); | ||
137 | |||
138 | #define _HAVE_ARCH_IPV6_CSUM | ||
139 | static inline unsigned short int | ||
140 | csum_ipv6_magic(struct in6_addr *saddr, struct in6_addr *daddr, | ||
141 | __u32 len, unsigned short proto, unsigned int sum) | ||
142 | { | ||
143 | unsigned long tmp, tmp2; | ||
144 | |||
145 | asm(" addcc %2,%0,%0,icc0 \n" | ||
146 | |||
147 | /* add up the source addr */ | ||
148 | " ldi @(%3,0),%1 \n" | ||
149 | " addxcc %1,%0,%0,icc0 \n" | ||
150 | " ldi @(%3,4),%2 \n" | ||
151 | " addxcc %2,%0,%0,icc0 \n" | ||
152 | " ldi @(%3,8),%1 \n" | ||
153 | " addxcc %1,%0,%0,icc0 \n" | ||
154 | " ldi @(%3,12),%2 \n" | ||
155 | " addxcc %2,%0,%0,icc0 \n" | ||
156 | |||
157 | /* add up the dest addr */ | ||
158 | " ldi @(%4,0),%1 \n" | ||
159 | " addxcc %1,%0,%0,icc0 \n" | ||
160 | " ldi @(%4,4),%2 \n" | ||
161 | " addxcc %2,%0,%0,icc0 \n" | ||
162 | " ldi @(%4,8),%1 \n" | ||
163 | " addxcc %1,%0,%0,icc0 \n" | ||
164 | " ldi @(%4,12),%2 \n" | ||
165 | " addxcc %2,%0,%0,icc0 \n" | ||
166 | |||
167 | /* fold the 33-bit result into 16-bits */ | ||
168 | " addxcc gr0,%0,%0,icc0 \n" | ||
169 | " srli %0,#16,%1 \n" | ||
170 | " sethi #0,%0 \n" | ||
171 | " add %1,%0,%0 \n" | ||
172 | " srli %0,#16,%1 \n" | ||
173 | " add %1,%0,%0 \n" | ||
174 | |||
175 | : "=r" (sum), "=&r" (tmp), "=r" (tmp2) | ||
176 | : "r" (saddr), "r" (daddr), "0" (sum), "2" (len + proto) | ||
177 | : "icc0" | ||
178 | ); | ||
179 | |||
180 | return ~sum; | ||
181 | } | ||
182 | |||
183 | #endif /* _ASM_CHECKSUM_H */ | ||