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1 | #ifndef __SPARC64_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) */ |