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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 | ||
7a332b0c AB |
12 | #ifdef CONFIG_GENERIC_CSUM |
13 | #include <asm-generic/checksum.h> | |
14 | #else | |
1da177e4 | 15 | /* |
d95bbcb3 KG |
16 | * Computes the checksum of a memory block at src, length len, |
17 | * and adds in "sum" (32-bit), while copying the block to dst. | |
18 | * If an access exception occurs on src or dst, it stores -EFAULT | |
19 | * to *src_err or *dst_err respectively (if that pointer is not | |
20 | * NULL), and, for an error on src, zeroes the rest of dst. | |
21 | * | |
22 | * Like csum_partial, this must be called with even lengths, | |
23 | * except for the last fragment. | |
1da177e4 | 24 | */ |
879178cf AV |
25 | extern __wsum csum_partial_copy_generic(const void *src, void *dst, |
26 | int len, __wsum sum, | |
1da177e4 | 27 | int *src_err, int *dst_err); |
fdd374b6 | 28 | |
fdd374b6 AB |
29 | #define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER |
30 | extern __wsum csum_and_copy_from_user(const void __user *src, void *dst, | |
31 | int len, __wsum sum, int *err_ptr); | |
8c773914 AB |
32 | #define HAVE_CSUM_COPY_USER |
33 | extern __wsum csum_and_copy_to_user(const void *src, void __user *dst, | |
34 | int len, __wsum sum, int *err_ptr); | |
d95bbcb3 KG |
35 | |
36 | #define csum_partial_copy_nocheck(src, dst, len, sum) \ | |
37 | csum_partial_copy_generic((src), (dst), (len), (sum), NULL, NULL) | |
38 | ||
39 | ||
1da177e4 LT |
40 | /* |
41 | * turns a 32-bit partial checksum (e.g. from csum_partial) into a | |
42 | * 1's complement 16-bit checksum. | |
43 | */ | |
879178cf | 44 | static inline __sum16 csum_fold(__wsum sum) |
1da177e4 LT |
45 | { |
46 | unsigned int tmp; | |
47 | ||
48 | /* swap the two 16-bit halves of sum */ | |
49 | __asm__("rlwinm %0,%1,16,0,31" : "=r" (tmp) : "r" (sum)); | |
50 | /* if there is a carry from adding the two 16-bit halves, | |
51 | it will carry from the lower half into the upper half, | |
52 | giving us the correct sum in the upper half. */ | |
879178cf | 53 | return (__force __sum16)(~((__force u32)sum + tmp) >> 16); |
1da177e4 LT |
54 | } |
55 | ||
b492f7e4 PM |
56 | static inline u32 from64to32(u64 x) |
57 | { | |
58 | /* add up 32-bit and 32-bit for 32+c bit */ | |
59 | x = (x & 0xffffffff) + (x >> 32); | |
60 | /* add up carry.. */ | |
61 | x = (x & 0xffffffff) + (x >> 32); | |
62 | return (u32)x; | |
63 | } | |
64 | ||
f9d4286b IV |
65 | static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len, |
66 | __u8 proto, __wsum sum) | |
1da177e4 | 67 | { |
879178cf | 68 | #ifdef __powerpc64__ |
b492f7e4 | 69 | u64 s = (__force u32)sum; |
1da177e4 | 70 | |
879178cf AV |
71 | s += (__force u32)saddr; |
72 | s += (__force u32)daddr; | |
d4fde568 | 73 | #ifdef __BIG_ENDIAN__ |
879178cf | 74 | s += proto + len; |
d4fde568 PM |
75 | #else |
76 | s += (proto + len) << 8; | |
77 | #endif | |
b492f7e4 | 78 | return (__force __wsum) from64to32(s); |
d95bbcb3 | 79 | #else |
d95bbcb3 KG |
80 | __asm__("\n\ |
81 | addc %0,%0,%1 \n\ | |
82 | adde %0,%0,%2 \n\ | |
83 | adde %0,%0,%3 \n\ | |
84 | addze %0,%0 \n\ | |
85 | " | |
86 | : "=r" (sum) | |
879178cf AV |
87 | : "r" (daddr), "r"(saddr), "r"(proto + len), "0"(sum)); |
88 | return sum; | |
1da177e4 | 89 | #endif |
879178cf | 90 | } |
7a332b0c | 91 | |
92c985f1 LC |
92 | /* |
93 | * computes the checksum of the TCP/UDP pseudo-header | |
94 | * returns a 16-bit checksum, already complemented | |
95 | */ | |
f9d4286b IV |
96 | static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, __u32 len, |
97 | __u8 proto, __wsum sum) | |
92c985f1 LC |
98 | { |
99 | return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum)); | |
100 | } | |
101 | ||
501c8de7 LC |
102 | #define HAVE_ARCH_CSUM_ADD |
103 | static inline __wsum csum_add(__wsum csum, __wsum addend) | |
104 | { | |
105 | #ifdef __powerpc64__ | |
106 | u64 res = (__force u64)csum; | |
5a8847c8 CL |
107 | #endif |
108 | if (__builtin_constant_p(csum) && csum == 0) | |
109 | return addend; | |
110 | if (__builtin_constant_p(addend) && addend == 0) | |
111 | return csum; | |
501c8de7 | 112 | |
5a8847c8 | 113 | #ifdef __powerpc64__ |
501c8de7 | 114 | res += (__force u64)addend; |
6ad966d7 | 115 | return (__force __wsum) from64to32(res); |
501c8de7 LC |
116 | #else |
117 | asm("addc %0,%0,%1;" | |
118 | "addze %0,%0;" | |
11dfbf58 | 119 | : "+r" (csum) : "r" (addend) : "xer"); |
501c8de7 LC |
120 | return csum; |
121 | #endif | |
122 | } | |
123 | ||
37e08cad CL |
124 | /* |
125 | * This is a version of ip_compute_csum() optimized for IP headers, | |
126 | * which always checksum on 4 octet boundaries. ihl is the number | |
127 | * of 32-bit words and is always >= 5. | |
128 | */ | |
129 | static inline __wsum ip_fast_csum_nofold(const void *iph, unsigned int ihl) | |
130 | { | |
131 | const u32 *ptr = (const u32 *)iph + 1; | |
132 | #ifdef __powerpc64__ | |
133 | unsigned int i; | |
134 | u64 s = *(const u32 *)iph; | |
135 | ||
136 | for (i = 0; i < ihl - 1; i++, ptr++) | |
137 | s += *ptr; | |
b492f7e4 | 138 | return (__force __wsum)from64to32(s); |
37e08cad CL |
139 | #else |
140 | __wsum sum, tmp; | |
141 | ||
142 | asm("mtctr %3;" | |
143 | "addc %0,%4,%5;" | |
144 | "1: lwzu %1, 4(%2);" | |
145 | "adde %0,%0,%1;" | |
146 | "bdnz 1b;" | |
147 | "addze %0,%0;" | |
148 | : "=r" (sum), "=r" (tmp), "+b" (ptr) | |
149 | : "r" (ihl - 2), "r" (*(const u32 *)iph), "r" (*ptr) | |
150 | : "ctr", "xer", "memory"); | |
151 | ||
152 | return sum; | |
153 | #endif | |
154 | } | |
155 | ||
156 | static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) | |
157 | { | |
158 | return csum_fold(ip_fast_csum_nofold(iph, ihl)); | |
159 | } | |
160 | ||
7e393220 CL |
161 | /* |
162 | * computes the checksum of a memory block at buff, length len, | |
163 | * and adds in "sum" (32-bit) | |
164 | * | |
165 | * returns a 32-bit number suitable for feeding into itself | |
166 | * or csum_tcpudp_magic | |
167 | * | |
168 | * this function must be called with even lengths, except | |
169 | * for the last fragment, which may be odd | |
170 | * | |
171 | * it's best to have buff aligned on a 32-bit boundary | |
172 | */ | |
173 | __wsum __csum_partial(const void *buff, int len, __wsum sum); | |
174 | ||
175 | static inline __wsum csum_partial(const void *buff, int len, __wsum sum) | |
176 | { | |
177 | if (__builtin_constant_p(len) && len <= 16 && (len & 1) == 0) { | |
178 | if (len == 2) | |
179 | sum = csum_add(sum, (__force __wsum)*(const u16 *)buff); | |
180 | if (len >= 4) | |
181 | sum = csum_add(sum, (__force __wsum)*(const u32 *)buff); | |
182 | if (len == 6) | |
183 | sum = csum_add(sum, (__force __wsum) | |
184 | *(const u16 *)(buff + 4)); | |
185 | if (len >= 8) | |
186 | sum = csum_add(sum, (__force __wsum) | |
187 | *(const u32 *)(buff + 4)); | |
188 | if (len == 10) | |
189 | sum = csum_add(sum, (__force __wsum) | |
190 | *(const u16 *)(buff + 8)); | |
191 | if (len >= 12) | |
192 | sum = csum_add(sum, (__force __wsum) | |
193 | *(const u32 *)(buff + 8)); | |
194 | if (len == 14) | |
195 | sum = csum_add(sum, (__force __wsum) | |
196 | *(const u16 *)(buff + 12)); | |
197 | if (len >= 16) | |
198 | sum = csum_add(sum, (__force __wsum) | |
199 | *(const u32 *)(buff + 12)); | |
200 | } else if (__builtin_constant_p(len) && (len & 3) == 0) { | |
201 | sum = csum_add(sum, ip_fast_csum_nofold(buff, len >> 2)); | |
202 | } else { | |
203 | sum = __csum_partial(buff, len, sum); | |
204 | } | |
205 | return sum; | |
206 | } | |
207 | ||
208 | /* | |
209 | * this routine is used for miscellaneous IP-like checksums, mainly | |
210 | * in icmp.c | |
211 | */ | |
212 | static inline __sum16 ip_compute_csum(const void *buff, int len) | |
213 | { | |
214 | return csum_fold(csum_partial(buff, len, 0)); | |
215 | } | |
216 | ||
7a332b0c | 217 | #endif |
88ced031 | 218 | #endif /* __KERNEL__ */ |
d95bbcb3 | 219 | #endif |