diff options
author | David S. Miller <davem@davemloft.net> | 2009-04-16 20:35:26 -0400 |
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committer | David S. Miller <davem@davemloft.net> | 2009-04-16 20:35:26 -0400 |
commit | a54bfa40fd16aeb90bc556189221576f746f8567 (patch) | |
tree | 176bb7a99ffab5f42f0dd4e9671f335be3f3efa0 /arch/frv/include/asm/checksum.h | |
parent | fe957c40ec5e2763b9977c565beab3bde3aaf85b (diff) | |
parent | 134ffb4cad92a6aa534e55a9be145bca780a32c1 (diff) |
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
Diffstat (limited to 'arch/frv/include/asm/checksum.h')
-rw-r--r-- | arch/frv/include/asm/checksum.h | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/arch/frv/include/asm/checksum.h b/arch/frv/include/asm/checksum.h new file mode 100644 index 000000000000..269da09ff637 --- /dev/null +++ b/arch/frv/include/asm/checksum.h | |||
@@ -0,0 +1,180 @@ | |||
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 | __wsum csum_partial(const void *buff, int len, __wsum 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 | __wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum 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 __wsum csum_partial_copy_from_user(const void __user *src, void *dst, | ||
47 | int len, __wsum sum, int *csum_err); | ||
48 | |||
49 | /* | ||
50 | * This is a version of ip_compute_csum() optimized for IP headers, | ||
51 | * which always checksum on 4 octet boundaries. | ||
52 | * | ||
53 | */ | ||
54 | static inline | ||
55 | __sum16 ip_fast_csum(const void *iph, unsigned int ihl) | ||
56 | { | ||
57 | unsigned int tmp, inc, sum = 0; | ||
58 | |||
59 | asm(" addcc gr0,gr0,gr0,icc0\n" /* clear icc0.C */ | ||
60 | " subi %1,#4,%1 \n" | ||
61 | "0: \n" | ||
62 | " ldu.p @(%1,%3),%4 \n" | ||
63 | " subicc %2,#1,%2,icc1 \n" | ||
64 | " addxcc.p %4,%0,%0,icc0 \n" | ||
65 | " bhi icc1,#2,0b \n" | ||
66 | |||
67 | /* fold the 33-bit result into 16-bits */ | ||
68 | " addxcc gr0,%0,%0,icc0 \n" | ||
69 | " srli %0,#16,%1 \n" | ||
70 | " sethi #0,%0 \n" | ||
71 | " add %1,%0,%0 \n" | ||
72 | " srli %0,#16,%1 \n" | ||
73 | " add %1,%0,%0 \n" | ||
74 | |||
75 | : "=r" (sum), "=r" (iph), "=r" (ihl), "=r" (inc), "=&r"(tmp) | ||
76 | : "0" (sum), "1" (iph), "2" (ihl), "3" (4), | ||
77 | "m"(*(volatile struct { int _[100]; } *)iph) | ||
78 | : "icc0", "icc1", "memory" | ||
79 | ); | ||
80 | |||
81 | return (__force __sum16)~sum; | ||
82 | } | ||
83 | |||
84 | /* | ||
85 | * Fold a partial checksum | ||
86 | */ | ||
87 | static inline __sum16 csum_fold(__wsum sum) | ||
88 | { | ||
89 | unsigned int tmp; | ||
90 | |||
91 | asm(" srli %0,#16,%1 \n" | ||
92 | " sethi #0,%0 \n" | ||
93 | " add %1,%0,%0 \n" | ||
94 | " srli %0,#16,%1 \n" | ||
95 | " add %1,%0,%0 \n" | ||
96 | : "=r"(sum), "=&r"(tmp) | ||
97 | : "0"(sum) | ||
98 | ); | ||
99 | |||
100 | return (__force __sum16)~sum; | ||
101 | } | ||
102 | |||
103 | /* | ||
104 | * computes the checksum of the TCP/UDP pseudo-header | ||
105 | * returns a 16-bit checksum, already complemented | ||
106 | */ | ||
107 | static inline __wsum | ||
108 | csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len, | ||
109 | unsigned short proto, __wsum sum) | ||
110 | { | ||
111 | asm(" addcc %1,%0,%0,icc0 \n" | ||
112 | " addxcc %2,%0,%0,icc0 \n" | ||
113 | " addxcc %3,%0,%0,icc0 \n" | ||
114 | " addxcc gr0,%0,%0,icc0 \n" | ||
115 | : "=r" (sum) | ||
116 | : "r" (daddr), "r" (saddr), "r" (len + proto), "0"(sum) | ||
117 | : "icc0" | ||
118 | ); | ||
119 | return sum; | ||
120 | } | ||
121 | |||
122 | static inline __sum16 | ||
123 | csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len, | ||
124 | unsigned short proto, __wsum sum) | ||
125 | { | ||
126 | return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); | ||
127 | } | ||
128 | |||
129 | /* | ||
130 | * this routine is used for miscellaneous IP-like checksums, mainly | ||
131 | * in icmp.c | ||
132 | */ | ||
133 | extern __sum16 ip_compute_csum(const void *buff, int len); | ||
134 | |||
135 | #define _HAVE_ARCH_IPV6_CSUM | ||
136 | static inline __sum16 | ||
137 | csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr, | ||
138 | __u32 len, unsigned short proto, __wsum sum) | ||
139 | { | ||
140 | unsigned long tmp, tmp2; | ||
141 | |||
142 | asm(" addcc %2,%0,%0,icc0 \n" | ||
143 | |||
144 | /* add up the source addr */ | ||
145 | " ldi @(%3,0),%1 \n" | ||
146 | " addxcc %1,%0,%0,icc0 \n" | ||
147 | " ldi @(%3,4),%2 \n" | ||
148 | " addxcc %2,%0,%0,icc0 \n" | ||
149 | " ldi @(%3,8),%1 \n" | ||
150 | " addxcc %1,%0,%0,icc0 \n" | ||
151 | " ldi @(%3,12),%2 \n" | ||
152 | " addxcc %2,%0,%0,icc0 \n" | ||
153 | |||
154 | /* add up the dest addr */ | ||
155 | " ldi @(%4,0),%1 \n" | ||
156 | " addxcc %1,%0,%0,icc0 \n" | ||
157 | " ldi @(%4,4),%2 \n" | ||
158 | " addxcc %2,%0,%0,icc0 \n" | ||
159 | " ldi @(%4,8),%1 \n" | ||
160 | " addxcc %1,%0,%0,icc0 \n" | ||
161 | " ldi @(%4,12),%2 \n" | ||
162 | " addxcc %2,%0,%0,icc0 \n" | ||
163 | |||
164 | /* fold the 33-bit result into 16-bits */ | ||
165 | " addxcc gr0,%0,%0,icc0 \n" | ||
166 | " srli %0,#16,%1 \n" | ||
167 | " sethi #0,%0 \n" | ||
168 | " add %1,%0,%0 \n" | ||
169 | " srli %0,#16,%1 \n" | ||
170 | " add %1,%0,%0 \n" | ||
171 | |||
172 | : "=r" (sum), "=&r" (tmp), "=r" (tmp2) | ||
173 | : "r" (saddr), "r" (daddr), "0" (sum), "2" (len + proto) | ||
174 | : "icc0" | ||
175 | ); | ||
176 | |||
177 | return (__force __sum16)~sum; | ||
178 | } | ||
179 | |||
180 | #endif /* _ASM_CHECKSUM_H */ | ||