Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / arch / score / include / asm / checksum.h
blobf909ac3144a45a895751d038fbfea7495be59898
1 #ifndef _ASM_SCORE_CHECKSUM_H
2 #define _ASM_SCORE_CHECKSUM_H
4 #include <linux/in6.h>
5 #include <asm/uaccess.h>
7 /*
8 * computes the checksum of a memory block at buff, length len,
9 * and adds in "sum" (32-bit)
11 * returns a 32-bit number suitable for feeding into itself
12 * or csum_tcpudp_magic
14 * this function must be called with even lengths, except
15 * for the last fragment, which may be odd
17 * it's best to have buff aligned on a 32-bit boundary
19 unsigned int csum_partial(const void *buff, int len, __wsum sum);
20 unsigned int csum_partial_copy_from_user(const char *src, char *dst, int len,
21 unsigned int sum, int *csum_err);
22 unsigned int csum_partial_copy(const char *src, char *dst,
23 int len, unsigned int sum);
26 * this is a new version of the above that records errors it finds in *errp,
27 * but continues and zeros the rest of the buffer.
31 * Copy and checksum to user
33 #define HAVE_CSUM_COPY_USER
34 static inline
35 __wsum csum_and_copy_to_user(const void *src, void __user *dst, int len,
36 __wsum sum, int *err_ptr)
38 sum = csum_partial(src, len, sum);
39 if (copy_to_user(dst, src, len)) {
40 *err_ptr = -EFAULT;
41 return (__force __wsum) -1; /* invalid checksum */
43 return sum;
47 #define csum_partial_copy_nocheck csum_partial_copy
49 * Fold a partial checksum without adding pseudo headers
52 static inline __sum16 csum_fold(__wsum sum)
54 /* the while loop is unnecessary really, it's always enough with two
55 iterations */
56 __asm__ __volatile__(
57 ".set volatile\n\t"
58 ".set\tr1\n\t"
59 "slli\tr1,%0, 16\n\t"
60 "add\t%0,%0, r1\n\t"
61 "cmp.c\tr1, %0\n\t"
62 "srli\t%0, %0, 16\n\t"
63 "bleu\t1f\n\t"
64 "addi\t%0, 0x1\n\t"
65 "1:ldi\tr30, 0xffff\n\t"
66 "xor\t%0, %0, r30\n\t"
67 "slli\t%0, %0, 16\n\t"
68 "srli\t%0, %0, 16\n\t"
69 ".set\tnor1\n\t"
70 ".set optimize\n\t"
71 : "=r" (sum)
72 : "0" (sum));
73 return sum;
77 * This is a version of ip_compute_csum() optimized for IP headers,
78 * which always checksum on 4 octet boundaries.
80 * By Jorge Cwik <jorge@laser.satlink.net>, adapted for linux by
81 * Arnt Gulbrandsen.
83 static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
85 unsigned int sum;
86 unsigned long dummy;
88 __asm__ __volatile__(
89 ".set volatile\n\t"
90 ".set\tnor1\n\t"
91 "lw\t%0, [%1]\n\t"
92 "subri\t%2, %2, 4\n\t"
93 "slli\t%2, %2, 2\n\t"
94 "lw\t%3, [%1, 4]\n\t"
95 "add\t%2, %2, %1\n\t"
96 "add\t%0, %0, %3\n\t"
97 "cmp.c\t%3, %0\n\t"
98 "lw\t%3, [%1, 8]\n\t"
99 "bleu\t1f\n\t"
100 "addi\t%0, 0x1\n\t"
101 "1:\n\t"
102 "add\t%0, %0, %3\n\t"
103 "cmp.c\t%3, %0\n\t"
104 "lw\t%3, [%1, 12]\n\t"
105 "bleu\t1f\n\t"
106 "addi\t%0, 0x1\n\t"
107 "1:add\t%0, %0, %3\n\t"
108 "cmp.c\t%3, %0\n\t"
109 "bleu\t1f\n\t"
110 "addi\t%0, 0x1\n"
112 "1:\tlw\t%3, [%1, 16]\n\t"
113 "addi\t%1, 4\n\t"
114 "add\t%0, %0, %3\n\t"
115 "cmp.c\t%3, %0\n\t"
116 "bleu\t2f\n\t"
117 "addi\t%0, 0x1\n"
118 "2:cmp.c\t%2, %1\n\t"
119 "bne\t1b\n\t"
121 ".set\tr1\n\t"
122 ".set optimize\n\t"
123 : "=&r" (sum), "=&r" (iph), "=&r" (ihl), "=&r" (dummy)
124 : "1" (iph), "2" (ihl));
126 return csum_fold(sum);
129 static inline __wsum
130 csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
131 unsigned short proto, __wsum sum)
133 unsigned long tmp = (ntohs(len) << 16) + proto * 256;
134 __asm__ __volatile__(
135 ".set volatile\n\t"
136 "add\t%0, %0, %2\n\t"
137 "cmp.c\t%2, %0\n\t"
138 "bleu\t1f\n\t"
139 "addi\t%0, 0x1\n\t"
140 "1:\n\t"
141 "add\t%0, %0, %3\n\t"
142 "cmp.c\t%3, %0\n\t"
143 "bleu\t1f\n\t"
144 "addi\t%0, 0x1\n\t"
145 "1:\n\t"
146 "add\t%0, %0, %4\n\t"
147 "cmp.c\t%4, %0\n\t"
148 "bleu\t1f\n\t"
149 "addi\t%0, 0x1\n\t"
150 "1:\n\t"
151 ".set optimize\n\t"
152 : "=r" (sum)
153 : "0" (daddr), "r"(saddr),
154 "r" (tmp),
155 "r" (sum));
156 return sum;
160 * computes the checksum of the TCP/UDP pseudo-header
161 * returns a 16-bit checksum, already complemented
163 static inline __sum16
164 csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len,
165 unsigned short proto, __wsum sum)
167 return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
171 * this routine is used for miscellaneous IP-like checksums, mainly
172 * in icmp.c
175 static inline unsigned short ip_compute_csum(const void *buff, int len)
177 return csum_fold(csum_partial(buff, len, 0));
180 #define _HAVE_ARCH_IPV6_CSUM
181 static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
182 const struct in6_addr *daddr,
183 __u32 len, unsigned short proto,
184 __wsum sum)
186 __asm__ __volatile__(
187 ".set\tnoreorder\t\t\t# csum_ipv6_magic\n\t"
188 ".set\tnoat\n\t"
189 "addu\t%0, %5\t\t\t# proto (long in network byte order)\n\t"
190 "sltu\t$1, %0, %5\n\t"
191 "addu\t%0, $1\n\t"
192 "addu\t%0, %6\t\t\t# csum\n\t"
193 "sltu\t$1, %0, %6\n\t"
194 "lw\t%1, 0(%2)\t\t\t# four words source address\n\t"
195 "addu\t%0, $1\n\t"
196 "addu\t%0, %1\n\t"
197 "sltu\t$1, %0, %1\n\t"
198 "lw\t%1, 4(%2)\n\t"
199 "addu\t%0, $1\n\t"
200 "addu\t%0, %1\n\t"
201 "sltu\t$1, %0, %1\n\t"
202 "lw\t%1, 8(%2)\n\t"
203 "addu\t%0, $1\n\t"
204 "addu\t%0, %1\n\t"
205 "sltu\t$1, %0, %1\n\t"
206 "lw\t%1, 12(%2)\n\t"
207 "addu\t%0, $1\n\t"
208 "addu\t%0, %1\n\t"
209 "sltu\t$1, %0, %1\n\t"
210 "lw\t%1, 0(%3)\n\t"
211 "addu\t%0, $1\n\t"
212 "addu\t%0, %1\n\t"
213 "sltu\t$1, %0, %1\n\t"
214 "lw\t%1, 4(%3)\n\t"
215 "addu\t%0, $1\n\t"
216 "addu\t%0, %1\n\t"
217 "sltu\t$1, %0, %1\n\t"
218 "lw\t%1, 8(%3)\n\t"
219 "addu\t%0, $1\n\t"
220 "addu\t%0, %1\n\t"
221 "sltu\t$1, %0, %1\n\t"
222 "lw\t%1, 12(%3)\n\t"
223 "addu\t%0, $1\n\t"
224 "addu\t%0, %1\n\t"
225 "sltu\t$1, %0, %1\n\t"
226 "addu\t%0, $1\t\t\t# Add final carry\n\t"
227 ".set\tnoat\n\t"
228 ".set\tnoreorder"
229 : "=r" (sum), "=r" (proto)
230 : "r" (saddr), "r" (daddr),
231 "0" (htonl(len)), "1" (htonl(proto)), "r" (sum));
233 return csum_fold(sum);
235 #endif /* _ASM_SCORE_CHECKSUM_H */