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9a8fd558 CZ |
1 | /* |
2 | * include/asm-xtensa/checksum.h | |
3 | * | |
4 | * This file is subject to the terms and conditions of the GNU General Public | |
5 | * License. See the file "COPYING" in the main directory of this archive | |
6 | * for more details. | |
7 | * | |
8 | * Copyright (C) 2001 - 2005 Tensilica Inc. | |
9 | */ | |
10 | ||
11 | #ifndef _XTENSA_CHECKSUM_H | |
12 | #define _XTENSA_CHECKSUM_H | |
13 | ||
9a8fd558 | 14 | #include <linux/in6.h> |
b0c438e6 | 15 | #include <asm/uaccess.h> |
367b8112 | 16 | #include <variant/core.h> |
9a8fd558 CZ |
17 | |
18 | /* | |
19 | * computes the checksum of a memory block at buff, length len, | |
20 | * and adds in "sum" (32-bit) | |
21 | * | |
22 | * returns a 32-bit number suitable for feeding into itself | |
23 | * or csum_tcpudp_magic | |
24 | * | |
25 | * this function must be called with even lengths, except | |
26 | * for the last fragment, which may be odd | |
27 | * | |
28 | * it's best to have buff aligned on a 32-bit boundary | |
29 | */ | |
b8e4e01d | 30 | asmlinkage __wsum csum_partial(const void *buff, int len, __wsum sum); |
9a8fd558 CZ |
31 | |
32 | /* | |
33 | * the same as csum_partial, but copies from src while it | |
34 | * checksums, and handles user-space pointer exceptions correctly, when needed. | |
35 | * | |
36 | * here even more important to align src and dst on a 32-bit (or even | |
37 | * better 64-bit) boundary | |
38 | */ | |
39 | ||
c4c4594b CZ |
40 | asmlinkage __wsum csum_partial_copy_generic(const void *src, void *dst, |
41 | int len, __wsum sum, | |
42 | int *src_err_ptr, int *dst_err_ptr); | |
9a8fd558 CZ |
43 | |
44 | /* | |
45 | * Note: when you get a NULL pointer exception here this means someone | |
46 | * passed in an incorrect kernel address to one of these functions. | |
47 | * | |
b9e122c8 | 48 | * If you use these functions directly please don't forget the access_ok(). |
9a8fd558 | 49 | */ |
d99cf715 | 50 | static inline |
b8e4e01d AV |
51 | __wsum csum_partial_copy_nocheck(const void *src, void *dst, |
52 | int len, __wsum sum) | |
9a8fd558 | 53 | { |
b8e4e01d | 54 | return csum_partial_copy_generic(src, dst, len, sum, NULL, NULL); |
9a8fd558 CZ |
55 | } |
56 | ||
d99cf715 | 57 | static inline |
b8e4e01d | 58 | __wsum csum_partial_copy_from_user(const void __user *src, void *dst, |
c4c4594b | 59 | int len, __wsum sum, int *err_ptr) |
9a8fd558 | 60 | { |
b8e4e01d AV |
61 | return csum_partial_copy_generic((__force const void *)src, dst, |
62 | len, sum, err_ptr, NULL); | |
9a8fd558 CZ |
63 | } |
64 | ||
9a8fd558 CZ |
65 | /* |
66 | * Fold a partial checksum | |
67 | */ | |
68 | ||
b8e4e01d | 69 | static __inline__ __sum16 csum_fold(__wsum sum) |
9a8fd558 CZ |
70 | { |
71 | unsigned int __dummy; | |
72 | __asm__("extui %1, %0, 16, 16\n\t" | |
73 | "extui %0 ,%0, 0, 16\n\t" | |
74 | "add %0, %0, %1\n\t" | |
75 | "slli %1, %0, 16\n\t" | |
76 | "add %0, %0, %1\n\t" | |
77 | "extui %0, %0, 16, 16\n\t" | |
78 | "neg %0, %0\n\t" | |
79 | "addi %0, %0, -1\n\t" | |
80 | "extui %0, %0, 0, 16\n\t" | |
81 | : "=r" (sum), "=&r" (__dummy) | |
82 | : "0" (sum)); | |
b8e4e01d | 83 | return (__force __sum16)sum; |
9a8fd558 CZ |
84 | } |
85 | ||
86 | /* | |
87 | * This is a version of ip_compute_csum() optimized for IP headers, | |
88 | * which always checksum on 4 octet boundaries. | |
89 | */ | |
b8e4e01d | 90 | static __inline__ __sum16 ip_fast_csum(const void *iph, unsigned int ihl) |
9a8fd558 CZ |
91 | { |
92 | unsigned int sum, tmp, endaddr; | |
93 | ||
94 | __asm__ __volatile__( | |
95 | "sub %0, %0, %0\n\t" | |
96 | #if XCHAL_HAVE_LOOPS | |
97 | "loopgtz %2, 2f\n\t" | |
98 | #else | |
99 | "beqz %2, 2f\n\t" | |
100 | "slli %4, %2, 2\n\t" | |
101 | "add %4, %4, %1\n\t" | |
102 | "0:\t" | |
103 | #endif | |
104 | "l32i %3, %1, 0\n\t" | |
105 | "add %0, %0, %3\n\t" | |
106 | "bgeu %0, %3, 1f\n\t" | |
107 | "addi %0, %0, 1\n\t" | |
108 | "1:\t" | |
109 | "addi %1, %1, 4\n\t" | |
110 | #if !XCHAL_HAVE_LOOPS | |
111 | "blt %1, %4, 0b\n\t" | |
112 | #endif | |
113 | "2:\t" | |
114 | /* Since the input registers which are loaded with iph and ihl | |
115 | are modified, we must also specify them as outputs, or gcc | |
116 | will assume they contain their original values. */ | |
c4c4594b CZ |
117 | : "=r" (sum), "=r" (iph), "=r" (ihl), "=&r" (tmp), |
118 | "=&r" (endaddr) | |
7dbe5c54 CZ |
119 | : "1" (iph), "2" (ihl) |
120 | : "memory"); | |
9a8fd558 CZ |
121 | |
122 | return csum_fold(sum); | |
123 | } | |
124 | ||
b8e4e01d | 125 | static __inline__ __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, |
01cfbad7 AD |
126 | __u32 len, __u8 proto, |
127 | __wsum sum) | |
9a8fd558 CZ |
128 | { |
129 | ||
130 | #ifdef __XTENSA_EL__ | |
b8e4e01d | 131 | unsigned long len_proto = (len + proto) << 8; |
9a8fd558 | 132 | #elif defined(__XTENSA_EB__) |
b8e4e01d | 133 | unsigned long len_proto = len + proto; |
9a8fd558 CZ |
134 | #else |
135 | # error processor byte order undefined! | |
136 | #endif | |
137 | __asm__("add %0, %0, %1\n\t" | |
138 | "bgeu %0, %1, 1f\n\t" | |
139 | "addi %0, %0, 1\n\t" | |
140 | "1:\t" | |
141 | "add %0, %0, %2\n\t" | |
142 | "bgeu %0, %2, 1f\n\t" | |
143 | "addi %0, %0, 1\n\t" | |
144 | "1:\t" | |
145 | "add %0, %0, %3\n\t" | |
146 | "bgeu %0, %3, 1f\n\t" | |
147 | "addi %0, %0, 1\n\t" | |
148 | "1:\t" | |
149 | : "=r" (sum), "=r" (len_proto) | |
150 | : "r" (daddr), "r" (saddr), "1" (len_proto), "0" (sum)); | |
151 | return sum; | |
152 | } | |
153 | ||
154 | /* | |
155 | * computes the checksum of the TCP/UDP pseudo-header | |
156 | * returns a 16-bit checksum, already complemented | |
157 | */ | |
b8e4e01d | 158 | static __inline__ __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, |
01cfbad7 AD |
159 | __u32 len, __u8 proto, |
160 | __wsum sum) | |
9a8fd558 CZ |
161 | { |
162 | return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); | |
163 | } | |
164 | ||
165 | /* | |
166 | * this routine is used for miscellaneous IP-like checksums, mainly | |
167 | * in icmp.c | |
168 | */ | |
169 | ||
b8e4e01d | 170 | static __inline__ __sum16 ip_compute_csum(const void *buff, int len) |
9a8fd558 | 171 | { |
c4c4594b | 172 | return csum_fold (csum_partial(buff, len, 0)); |
9a8fd558 CZ |
173 | } |
174 | ||
175 | #define _HAVE_ARCH_IPV6_CSUM | |
b8e4e01d AV |
176 | static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr, |
177 | const struct in6_addr *daddr, | |
1e940829 | 178 | __u32 len, __u8 proto, |
b8e4e01d | 179 | __wsum sum) |
9a8fd558 CZ |
180 | { |
181 | unsigned int __dummy; | |
182 | __asm__("l32i %1, %2, 0\n\t" | |
183 | "add %0, %0, %1\n\t" | |
184 | "bgeu %0, %1, 1f\n\t" | |
185 | "addi %0, %0, 1\n\t" | |
186 | "1:\t" | |
187 | "l32i %1, %2, 4\n\t" | |
188 | "add %0, %0, %1\n\t" | |
189 | "bgeu %0, %1, 1f\n\t" | |
190 | "addi %0, %0, 1\n\t" | |
191 | "1:\t" | |
192 | "l32i %1, %2, 8\n\t" | |
193 | "add %0, %0, %1\n\t" | |
194 | "bgeu %0, %1, 1f\n\t" | |
195 | "addi %0, %0, 1\n\t" | |
196 | "1:\t" | |
197 | "l32i %1, %2, 12\n\t" | |
198 | "add %0, %0, %1\n\t" | |
199 | "bgeu %0, %1, 1f\n\t" | |
200 | "addi %0, %0, 1\n\t" | |
201 | "1:\t" | |
202 | "l32i %1, %3, 0\n\t" | |
203 | "add %0, %0, %1\n\t" | |
204 | "bgeu %0, %1, 1f\n\t" | |
205 | "addi %0, %0, 1\n\t" | |
206 | "1:\t" | |
207 | "l32i %1, %3, 4\n\t" | |
208 | "add %0, %0, %1\n\t" | |
209 | "bgeu %0, %1, 1f\n\t" | |
210 | "addi %0, %0, 1\n\t" | |
211 | "1:\t" | |
212 | "l32i %1, %3, 8\n\t" | |
213 | "add %0, %0, %1\n\t" | |
214 | "bgeu %0, %1, 1f\n\t" | |
215 | "addi %0, %0, 1\n\t" | |
216 | "1:\t" | |
217 | "l32i %1, %3, 12\n\t" | |
218 | "add %0, %0, %1\n\t" | |
219 | "bgeu %0, %1, 1f\n\t" | |
220 | "addi %0, %0, 1\n\t" | |
221 | "1:\t" | |
222 | "add %0, %0, %4\n\t" | |
223 | "bgeu %0, %4, 1f\n\t" | |
224 | "addi %0, %0, 1\n\t" | |
225 | "1:\t" | |
226 | "add %0, %0, %5\n\t" | |
227 | "bgeu %0, %5, 1f\n\t" | |
228 | "addi %0, %0, 1\n\t" | |
229 | "1:\t" | |
230 | : "=r" (sum), "=&r" (__dummy) | |
231 | : "r" (saddr), "r" (daddr), | |
7dbe5c54 CZ |
232 | "r" (htonl(len)), "r" (htonl(proto)), "0" (sum) |
233 | : "memory"); | |
9a8fd558 CZ |
234 | |
235 | return csum_fold(sum); | |
236 | } | |
237 | ||
238 | /* | |
239 | * Copy and checksum to user | |
240 | */ | |
241 | #define HAVE_CSUM_COPY_USER | |
c4c4594b CZ |
242 | static __inline__ __wsum csum_and_copy_to_user(const void *src, |
243 | void __user *dst, int len, | |
244 | __wsum sum, int *err_ptr) | |
9a8fd558 CZ |
245 | { |
246 | if (access_ok(VERIFY_WRITE, dst, len)) | |
c4c4594b | 247 | return csum_partial_copy_generic(src,dst,len,sum,NULL,err_ptr); |
9a8fd558 CZ |
248 | |
249 | if (len) | |
250 | *err_ptr = -EFAULT; | |
251 | ||
b8e4e01d | 252 | return (__force __wsum)-1; /* invalid checksum */ |
9a8fd558 CZ |
253 | } |
254 | #endif |