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d95bbcb3 KG |
1 | #ifndef _ASM_POWERPC_CHECKSUM_H |
2 | #define _ASM_POWERPC_CHECKSUM_H | |
88ced031 | 3 | #ifdef __KERNEL__ |
1da177e4 LT |
4 | |
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 | ||
55a0edf0 | 12 | #include <linux/bitops.h> |
e9c4943a | 13 | #include <linux/in6.h> |
1da177e4 | 14 | /* |
d95bbcb3 KG |
15 | * Computes the checksum of a memory block at src, length len, |
16 | * and adds in "sum" (32-bit), while copying the block to dst. | |
17 | * If an access exception occurs on src or dst, it stores -EFAULT | |
18 | * to *src_err or *dst_err respectively (if that pointer is not | |
19 | * NULL), and, for an error on src, zeroes the rest of dst. | |
20 | * | |
21 | * Like csum_partial, this must be called with even lengths, | |
22 | * except for the last fragment. | |
1da177e4 | 23 | */ |
879178cf AV |
24 | extern __wsum csum_partial_copy_generic(const void *src, void *dst, |
25 | int len, __wsum sum, | |
1da177e4 | 26 | int *src_err, int *dst_err); |
fdd374b6 | 27 | |
fdd374b6 AB |
28 | #define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER |
29 | extern __wsum csum_and_copy_from_user(const void __user *src, void *dst, | |
30 | int len, __wsum sum, int *err_ptr); | |
8c773914 AB |
31 | #define HAVE_CSUM_COPY_USER |
32 | extern __wsum csum_and_copy_to_user(const void *src, void __user *dst, | |
33 | int len, __wsum sum, int *err_ptr); | |
d95bbcb3 KG |
34 | |
35 | #define csum_partial_copy_nocheck(src, dst, len, sum) \ | |
36 | csum_partial_copy_generic((src), (dst), (len), (sum), NULL, NULL) | |
37 | ||
38 | ||
1da177e4 LT |
39 | /* |
40 | * turns a 32-bit partial checksum (e.g. from csum_partial) into a | |
41 | * 1's complement 16-bit checksum. | |
42 | */ | |
879178cf | 43 | static inline __sum16 csum_fold(__wsum sum) |
1da177e4 LT |
44 | { |
45 | unsigned int tmp; | |
46 | ||
47 | /* swap the two 16-bit halves of sum */ | |
48 | __asm__("rlwinm %0,%1,16,0,31" : "=r" (tmp) : "r" (sum)); | |
49 | /* if there is a carry from adding the two 16-bit halves, | |
50 | it will carry from the lower half into the upper half, | |
51 | giving us the correct sum in the upper half. */ | |
879178cf | 52 | return (__force __sum16)(~((__force u32)sum + tmp) >> 16); |
1da177e4 LT |
53 | } |
54 | ||
b492f7e4 PM |
55 | static inline u32 from64to32(u64 x) |
56 | { | |
55a0edf0 | 57 | return (x + ror64(x, 32)) >> 32; |
b492f7e4 PM |
58 | } |
59 | ||
f9d4286b IV |
60 | static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len, |
61 | __u8 proto, __wsum sum) | |
1da177e4 | 62 | { |
879178cf | 63 | #ifdef __powerpc64__ |
b492f7e4 | 64 | u64 s = (__force u32)sum; |
1da177e4 | 65 | |
879178cf AV |
66 | s += (__force u32)saddr; |
67 | s += (__force u32)daddr; | |
d4fde568 | 68 | #ifdef __BIG_ENDIAN__ |
879178cf | 69 | s += proto + len; |
d4fde568 PM |
70 | #else |
71 | s += (proto + len) << 8; | |
72 | #endif | |
b492f7e4 | 73 | return (__force __wsum) from64to32(s); |
d95bbcb3 | 74 | #else |
d95bbcb3 KG |
75 | __asm__("\n\ |
76 | addc %0,%0,%1 \n\ | |
77 | adde %0,%0,%2 \n\ | |
78 | adde %0,%0,%3 \n\ | |
79 | addze %0,%0 \n\ | |
80 | " | |
81 | : "=r" (sum) | |
879178cf AV |
82 | : "r" (daddr), "r"(saddr), "r"(proto + len), "0"(sum)); |
83 | return sum; | |
1da177e4 | 84 | #endif |
879178cf | 85 | } |
7a332b0c | 86 | |
92c985f1 LC |
87 | /* |
88 | * computes the checksum of the TCP/UDP pseudo-header | |
89 | * returns a 16-bit checksum, already complemented | |
90 | */ | |
f9d4286b IV |
91 | static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, __u32 len, |
92 | __u8 proto, __wsum sum) | |
92c985f1 LC |
93 | { |
94 | return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum)); | |
95 | } | |
96 | ||
501c8de7 LC |
97 | #define HAVE_ARCH_CSUM_ADD |
98 | static inline __wsum csum_add(__wsum csum, __wsum addend) | |
99 | { | |
100 | #ifdef __powerpc64__ | |
101 | u64 res = (__force u64)csum; | |
5a8847c8 CL |
102 | #endif |
103 | if (__builtin_constant_p(csum) && csum == 0) | |
104 | return addend; | |
105 | if (__builtin_constant_p(addend) && addend == 0) | |
106 | return csum; | |
501c8de7 | 107 | |
5a8847c8 | 108 | #ifdef __powerpc64__ |
501c8de7 | 109 | res += (__force u64)addend; |
96f391cf | 110 | return (__force __wsum)((u32)res + (res >> 32)); |
501c8de7 LC |
111 | #else |
112 | asm("addc %0,%0,%1;" | |
113 | "addze %0,%0;" | |
11dfbf58 | 114 | : "+r" (csum) : "r" (addend) : "xer"); |
501c8de7 LC |
115 | return csum; |
116 | #endif | |
117 | } | |
118 | ||
37e08cad CL |
119 | /* |
120 | * This is a version of ip_compute_csum() optimized for IP headers, | |
121 | * which always checksum on 4 octet boundaries. ihl is the number | |
122 | * of 32-bit words and is always >= 5. | |
123 | */ | |
124 | static inline __wsum ip_fast_csum_nofold(const void *iph, unsigned int ihl) | |
125 | { | |
126 | const u32 *ptr = (const u32 *)iph + 1; | |
127 | #ifdef __powerpc64__ | |
128 | unsigned int i; | |
129 | u64 s = *(const u32 *)iph; | |
130 | ||
131 | for (i = 0; i < ihl - 1; i++, ptr++) | |
132 | s += *ptr; | |
b492f7e4 | 133 | return (__force __wsum)from64to32(s); |
37e08cad CL |
134 | #else |
135 | __wsum sum, tmp; | |
136 | ||
137 | asm("mtctr %3;" | |
138 | "addc %0,%4,%5;" | |
139 | "1: lwzu %1, 4(%2);" | |
140 | "adde %0,%0,%1;" | |
141 | "bdnz 1b;" | |
142 | "addze %0,%0;" | |
143 | : "=r" (sum), "=r" (tmp), "+b" (ptr) | |
144 | : "r" (ihl - 2), "r" (*(const u32 *)iph), "r" (*ptr) | |
145 | : "ctr", "xer", "memory"); | |
146 | ||
147 | return sum; | |
148 | #endif | |
149 | } | |
150 | ||
151 | static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) | |
152 | { | |
153 | return csum_fold(ip_fast_csum_nofold(iph, ihl)); | |
154 | } | |
155 | ||
7e393220 CL |
156 | /* |
157 | * computes the checksum of a memory block at buff, length len, | |
158 | * and adds in "sum" (32-bit) | |
159 | * | |
160 | * returns a 32-bit number suitable for feeding into itself | |
161 | * or csum_tcpudp_magic | |
162 | * | |
163 | * this function must be called with even lengths, except | |
164 | * for the last fragment, which may be odd | |
165 | * | |
166 | * it's best to have buff aligned on a 32-bit boundary | |
167 | */ | |
168 | __wsum __csum_partial(const void *buff, int len, __wsum sum); | |
169 | ||
170 | static inline __wsum csum_partial(const void *buff, int len, __wsum sum) | |
171 | { | |
172 | if (__builtin_constant_p(len) && len <= 16 && (len & 1) == 0) { | |
173 | if (len == 2) | |
174 | sum = csum_add(sum, (__force __wsum)*(const u16 *)buff); | |
175 | if (len >= 4) | |
176 | sum = csum_add(sum, (__force __wsum)*(const u32 *)buff); | |
177 | if (len == 6) | |
178 | sum = csum_add(sum, (__force __wsum) | |
179 | *(const u16 *)(buff + 4)); | |
180 | if (len >= 8) | |
181 | sum = csum_add(sum, (__force __wsum) | |
182 | *(const u32 *)(buff + 4)); | |
183 | if (len == 10) | |
184 | sum = csum_add(sum, (__force __wsum) | |
185 | *(const u16 *)(buff + 8)); | |
186 | if (len >= 12) | |
187 | sum = csum_add(sum, (__force __wsum) | |
188 | *(const u32 *)(buff + 8)); | |
189 | if (len == 14) | |
190 | sum = csum_add(sum, (__force __wsum) | |
191 | *(const u16 *)(buff + 12)); | |
192 | if (len >= 16) | |
193 | sum = csum_add(sum, (__force __wsum) | |
194 | *(const u32 *)(buff + 12)); | |
195 | } else if (__builtin_constant_p(len) && (len & 3) == 0) { | |
196 | sum = csum_add(sum, ip_fast_csum_nofold(buff, len >> 2)); | |
197 | } else { | |
198 | sum = __csum_partial(buff, len, sum); | |
199 | } | |
200 | return sum; | |
201 | } | |
202 | ||
203 | /* | |
204 | * this routine is used for miscellaneous IP-like checksums, mainly | |
205 | * in icmp.c | |
206 | */ | |
207 | static inline __sum16 ip_compute_csum(const void *buff, int len) | |
208 | { | |
209 | return csum_fold(csum_partial(buff, len, 0)); | |
210 | } | |
211 | ||
e9c4943a CL |
212 | #define _HAVE_ARCH_IPV6_CSUM |
213 | __sum16 csum_ipv6_magic(const struct in6_addr *saddr, | |
214 | const struct in6_addr *daddr, | |
215 | __u32 len, __u8 proto, __wsum sum); | |
216 | ||
88ced031 | 217 | #endif /* __KERNEL__ */ |
d95bbcb3 | 218 | #endif |