diff options
Diffstat (limited to 'include/asm-sparc64/checksum.h')
-rw-r--r-- | include/asm-sparc64/checksum.h | 168 |
1 files changed, 1 insertions, 167 deletions
diff --git a/include/asm-sparc64/checksum.h b/include/asm-sparc64/checksum.h index b290564c8ce0..c3966c5e29d8 100644 --- a/include/asm-sparc64/checksum.h +++ b/include/asm-sparc64/checksum.h | |||
@@ -1,167 +1 @@ | |||
1 | #ifndef __SPARC64_CHECKSUM_H | #include <asm-sparc/checksum.h> | |
2 | #define __SPARC64_CHECKSUM_H | ||
3 | |||
4 | /* checksum.h: IP/UDP/TCP checksum routines on the V9. | ||
5 | * | ||
6 | * Copyright(C) 1995 Linus Torvalds | ||
7 | * Copyright(C) 1995 Miguel de Icaza | ||
8 | * Copyright(C) 1996 David S. Miller | ||
9 | * Copyright(C) 1996 Eddie C. Dost | ||
10 | * Copyright(C) 1997 Jakub Jelinek | ||
11 | * | ||
12 | * derived from: | ||
13 | * Alpha checksum c-code | ||
14 | * ix86 inline assembly | ||
15 | * RFC1071 Computing the Internet Checksum | ||
16 | */ | ||
17 | |||
18 | #include <linux/in6.h> | ||
19 | #include <asm/uaccess.h> | ||
20 | |||
21 | /* computes the checksum of a memory block at buff, length len, | ||
22 | * and adds in "sum" (32-bit) | ||
23 | * | ||
24 | * returns a 32-bit number suitable for feeding into itself | ||
25 | * or csum_tcpudp_magic | ||
26 | * | ||
27 | * this function must be called with even lengths, except | ||
28 | * for the last fragment, which may be odd | ||
29 | * | ||
30 | * it's best to have buff aligned on a 32-bit boundary | ||
31 | */ | ||
32 | extern __wsum csum_partial(const void * buff, int len, __wsum sum); | ||
33 | |||
34 | /* the same as csum_partial, but copies from user space while it | ||
35 | * checksums | ||
36 | * | ||
37 | * here even more important to align src and dst on a 32-bit (or even | ||
38 | * better 64-bit) boundary | ||
39 | */ | ||
40 | extern __wsum csum_partial_copy_nocheck(const void *src, void *dst, | ||
41 | int len, __wsum sum); | ||
42 | |||
43 | extern long __csum_partial_copy_from_user(const void __user *src, | ||
44 | void *dst, int len, | ||
45 | __wsum sum); | ||
46 | |||
47 | static inline __wsum | ||
48 | csum_partial_copy_from_user(const void __user *src, | ||
49 | void *dst, int len, | ||
50 | __wsum sum, int *err) | ||
51 | { | ||
52 | long ret = __csum_partial_copy_from_user(src, dst, len, sum); | ||
53 | if (ret < 0) | ||
54 | *err = -EFAULT; | ||
55 | return (__force __wsum) ret; | ||
56 | } | ||
57 | |||
58 | /* | ||
59 | * Copy and checksum to user | ||
60 | */ | ||
61 | #define HAVE_CSUM_COPY_USER | ||
62 | extern long __csum_partial_copy_to_user(const void *src, | ||
63 | void __user *dst, int len, | ||
64 | __wsum sum); | ||
65 | |||
66 | static inline __wsum | ||
67 | csum_and_copy_to_user(const void *src, | ||
68 | void __user *dst, int len, | ||
69 | __wsum sum, int *err) | ||
70 | { | ||
71 | long ret = __csum_partial_copy_to_user(src, dst, len, sum); | ||
72 | if (ret < 0) | ||
73 | *err = -EFAULT; | ||
74 | return (__force __wsum) ret; | ||
75 | } | ||
76 | |||
77 | /* ihl is always 5 or greater, almost always is 5, and iph is word aligned | ||
78 | * the majority of the time. | ||
79 | */ | ||
80 | extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl); | ||
81 | |||
82 | /* Fold a partial checksum without adding pseudo headers. */ | ||
83 | static inline __sum16 csum_fold(__wsum sum) | ||
84 | { | ||
85 | unsigned int tmp; | ||
86 | |||
87 | __asm__ __volatile__( | ||
88 | " addcc %0, %1, %1\n" | ||
89 | " srl %1, 16, %1\n" | ||
90 | " addc %1, %%g0, %1\n" | ||
91 | " xnor %%g0, %1, %0\n" | ||
92 | : "=&r" (sum), "=r" (tmp) | ||
93 | : "0" (sum), "1" ((__force u32)sum<<16) | ||
94 | : "cc"); | ||
95 | return (__force __sum16)sum; | ||
96 | } | ||
97 | |||
98 | static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, | ||
99 | unsigned int len, | ||
100 | unsigned short proto, | ||
101 | __wsum sum) | ||
102 | { | ||
103 | __asm__ __volatile__( | ||
104 | " addcc %1, %0, %0\n" | ||
105 | " addccc %2, %0, %0\n" | ||
106 | " addccc %3, %0, %0\n" | ||
107 | " addc %0, %%g0, %0\n" | ||
108 | : "=r" (sum), "=r" (saddr) | ||
109 | : "r" (daddr), "r" (proto + len), "0" (sum), "1" (saddr) | ||
110 | : "cc"); | ||
111 | return sum; | ||
112 | } | ||
113 | |||
114 | /* | ||
115 | * computes the checksum of the TCP/UDP pseudo-header | ||
116 | * returns a 16-bit checksum, already complemented | ||
117 | */ | ||
118 | static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, | ||
119 | unsigned short len, | ||
120 | unsigned short proto, | ||
121 | __wsum sum) | ||
122 | { | ||
123 | return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); | ||
124 | } | ||
125 | |||
126 | #define _HAVE_ARCH_IPV6_CSUM | ||
127 | |||
128 | static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr, | ||
129 | const struct in6_addr *daddr, | ||
130 | __u32 len, unsigned short proto, | ||
131 | __wsum sum) | ||
132 | { | ||
133 | __asm__ __volatile__ ( | ||
134 | " addcc %3, %4, %%g7\n" | ||
135 | " addccc %5, %%g7, %%g7\n" | ||
136 | " lduw [%2 + 0x0c], %%g2\n" | ||
137 | " lduw [%2 + 0x08], %%g3\n" | ||
138 | " addccc %%g2, %%g7, %%g7\n" | ||
139 | " lduw [%2 + 0x04], %%g2\n" | ||
140 | " addccc %%g3, %%g7, %%g7\n" | ||
141 | " lduw [%2 + 0x00], %%g3\n" | ||
142 | " addccc %%g2, %%g7, %%g7\n" | ||
143 | " lduw [%1 + 0x0c], %%g2\n" | ||
144 | " addccc %%g3, %%g7, %%g7\n" | ||
145 | " lduw [%1 + 0x08], %%g3\n" | ||
146 | " addccc %%g2, %%g7, %%g7\n" | ||
147 | " lduw [%1 + 0x04], %%g2\n" | ||
148 | " addccc %%g3, %%g7, %%g7\n" | ||
149 | " lduw [%1 + 0x00], %%g3\n" | ||
150 | " addccc %%g2, %%g7, %%g7\n" | ||
151 | " addccc %%g3, %%g7, %0\n" | ||
152 | " addc 0, %0, %0\n" | ||
153 | : "=&r" (sum) | ||
154 | : "r" (saddr), "r" (daddr), "r"(htonl(len)), | ||
155 | "r"(htonl(proto)), "r"(sum) | ||
156 | : "g2", "g3", "g7", "cc"); | ||
157 | |||
158 | return csum_fold(sum); | ||
159 | } | ||
160 | |||
161 | /* this routine is used for miscellaneous IP-like checksums, mainly in icmp.c */ | ||
162 | static inline __sum16 ip_compute_csum(const void *buff, int len) | ||
163 | { | ||
164 | return csum_fold(csum_partial(buff, len, 0)); | ||
165 | } | ||
166 | |||
167 | #endif /* !(__SPARC64_CHECKSUM_H) */ | ||