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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> |
173d6681 | 15 | #include <asm/variant/core.h> |
9a8fd558 CZ |
16 | |
17 | /* | |
18 | * computes the checksum of a memory block at buff, length len, | |
19 | * and adds in "sum" (32-bit) | |
20 | * | |
21 | * returns a 32-bit number suitable for feeding into itself | |
22 | * or csum_tcpudp_magic | |
23 | * | |
24 | * this function must be called with even lengths, except | |
25 | * for the last fragment, which may be odd | |
26 | * | |
27 | * it's best to have buff aligned on a 32-bit boundary | |
28 | */ | |
b8e4e01d | 29 | asmlinkage __wsum csum_partial(const void *buff, int len, __wsum sum); |
9a8fd558 CZ |
30 | |
31 | /* | |
32 | * the same as csum_partial, but copies from src while it | |
33 | * checksums, and handles user-space pointer exceptions correctly, when needed. | |
34 | * | |
35 | * here even more important to align src and dst on a 32-bit (or even | |
36 | * better 64-bit) boundary | |
37 | */ | |
38 | ||
b8e4e01d | 39 | asmlinkage __wsum csum_partial_copy_generic(const void *src, void *dst, int len, __wsum sum, |
9a8fd558 CZ |
40 | int *src_err_ptr, int *dst_err_ptr); |
41 | ||
42 | /* | |
43 | * Note: when you get a NULL pointer exception here this means someone | |
44 | * passed in an incorrect kernel address to one of these functions. | |
45 | * | |
b9e122c8 | 46 | * If you use these functions directly please don't forget the access_ok(). |
9a8fd558 | 47 | */ |
d99cf715 | 48 | static inline |
b8e4e01d AV |
49 | __wsum csum_partial_copy_nocheck(const void *src, void *dst, |
50 | int len, __wsum sum) | |
9a8fd558 | 51 | { |
b8e4e01d | 52 | return csum_partial_copy_generic(src, dst, len, sum, NULL, NULL); |
9a8fd558 CZ |
53 | } |
54 | ||
d99cf715 | 55 | static inline |
b8e4e01d AV |
56 | __wsum csum_partial_copy_from_user(const void __user *src, void *dst, |
57 | int len, __wsum sum, int *err_ptr) | |
9a8fd558 | 58 | { |
b8e4e01d AV |
59 | return csum_partial_copy_generic((__force const void *)src, dst, |
60 | len, sum, err_ptr, NULL); | |
9a8fd558 CZ |
61 | } |
62 | ||
9a8fd558 CZ |
63 | /* |
64 | * Fold a partial checksum | |
65 | */ | |
66 | ||
b8e4e01d | 67 | static __inline__ __sum16 csum_fold(__wsum sum) |
9a8fd558 CZ |
68 | { |
69 | unsigned int __dummy; | |
70 | __asm__("extui %1, %0, 16, 16\n\t" | |
71 | "extui %0 ,%0, 0, 16\n\t" | |
72 | "add %0, %0, %1\n\t" | |
73 | "slli %1, %0, 16\n\t" | |
74 | "add %0, %0, %1\n\t" | |
75 | "extui %0, %0, 16, 16\n\t" | |
76 | "neg %0, %0\n\t" | |
77 | "addi %0, %0, -1\n\t" | |
78 | "extui %0, %0, 0, 16\n\t" | |
79 | : "=r" (sum), "=&r" (__dummy) | |
80 | : "0" (sum)); | |
b8e4e01d | 81 | return (__force __sum16)sum; |
9a8fd558 CZ |
82 | } |
83 | ||
84 | /* | |
85 | * This is a version of ip_compute_csum() optimized for IP headers, | |
86 | * which always checksum on 4 octet boundaries. | |
87 | */ | |
b8e4e01d | 88 | static __inline__ __sum16 ip_fast_csum(const void *iph, unsigned int ihl) |
9a8fd558 CZ |
89 | { |
90 | unsigned int sum, tmp, endaddr; | |
91 | ||
92 | __asm__ __volatile__( | |
93 | "sub %0, %0, %0\n\t" | |
94 | #if XCHAL_HAVE_LOOPS | |
95 | "loopgtz %2, 2f\n\t" | |
96 | #else | |
97 | "beqz %2, 2f\n\t" | |
98 | "slli %4, %2, 2\n\t" | |
99 | "add %4, %4, %1\n\t" | |
100 | "0:\t" | |
101 | #endif | |
102 | "l32i %3, %1, 0\n\t" | |
103 | "add %0, %0, %3\n\t" | |
104 | "bgeu %0, %3, 1f\n\t" | |
105 | "addi %0, %0, 1\n\t" | |
106 | "1:\t" | |
107 | "addi %1, %1, 4\n\t" | |
108 | #if !XCHAL_HAVE_LOOPS | |
109 | "blt %1, %4, 0b\n\t" | |
110 | #endif | |
111 | "2:\t" | |
112 | /* Since the input registers which are loaded with iph and ihl | |
113 | are modified, we must also specify them as outputs, or gcc | |
114 | will assume they contain their original values. */ | |
115 | : "=r" (sum), "=r" (iph), "=r" (ihl), "=&r" (tmp), "=&r" (endaddr) | |
116 | : "1" (iph), "2" (ihl)); | |
117 | ||
118 | return csum_fold(sum); | |
119 | } | |
120 | ||
b8e4e01d | 121 | static __inline__ __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, |
9a8fd558 CZ |
122 | unsigned short len, |
123 | unsigned short proto, | |
b8e4e01d | 124 | __wsum sum) |
9a8fd558 CZ |
125 | { |
126 | ||
127 | #ifdef __XTENSA_EL__ | |
b8e4e01d | 128 | unsigned long len_proto = (len + proto) << 8; |
9a8fd558 | 129 | #elif defined(__XTENSA_EB__) |
b8e4e01d | 130 | unsigned long len_proto = len + proto; |
9a8fd558 CZ |
131 | #else |
132 | # error processor byte order undefined! | |
133 | #endif | |
134 | __asm__("add %0, %0, %1\n\t" | |
135 | "bgeu %0, %1, 1f\n\t" | |
136 | "addi %0, %0, 1\n\t" | |
137 | "1:\t" | |
138 | "add %0, %0, %2\n\t" | |
139 | "bgeu %0, %2, 1f\n\t" | |
140 | "addi %0, %0, 1\n\t" | |
141 | "1:\t" | |
142 | "add %0, %0, %3\n\t" | |
143 | "bgeu %0, %3, 1f\n\t" | |
144 | "addi %0, %0, 1\n\t" | |
145 | "1:\t" | |
146 | : "=r" (sum), "=r" (len_proto) | |
147 | : "r" (daddr), "r" (saddr), "1" (len_proto), "0" (sum)); | |
148 | return sum; | |
149 | } | |
150 | ||
151 | /* | |
152 | * computes the checksum of the TCP/UDP pseudo-header | |
153 | * returns a 16-bit checksum, already complemented | |
154 | */ | |
b8e4e01d | 155 | static __inline__ __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, |
9a8fd558 CZ |
156 | unsigned short len, |
157 | unsigned short proto, | |
b8e4e01d | 158 | __wsum sum) |
9a8fd558 CZ |
159 | { |
160 | return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); | |
161 | } | |
162 | ||
163 | /* | |
164 | * this routine is used for miscellaneous IP-like checksums, mainly | |
165 | * in icmp.c | |
166 | */ | |
167 | ||
b8e4e01d | 168 | static __inline__ __sum16 ip_compute_csum(const void *buff, int len) |
9a8fd558 CZ |
169 | { |
170 | return csum_fold (csum_partial(buff, len, 0)); | |
171 | } | |
172 | ||
173 | #define _HAVE_ARCH_IPV6_CSUM | |
b8e4e01d AV |
174 | static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr, |
175 | const struct in6_addr *daddr, | |
176 | __u32 len, unsigned short proto, | |
177 | __wsum sum) | |
9a8fd558 CZ |
178 | { |
179 | unsigned int __dummy; | |
180 | __asm__("l32i %1, %2, 0\n\t" | |
181 | "add %0, %0, %1\n\t" | |
182 | "bgeu %0, %1, 1f\n\t" | |
183 | "addi %0, %0, 1\n\t" | |
184 | "1:\t" | |
185 | "l32i %1, %2, 4\n\t" | |
186 | "add %0, %0, %1\n\t" | |
187 | "bgeu %0, %1, 1f\n\t" | |
188 | "addi %0, %0, 1\n\t" | |
189 | "1:\t" | |
190 | "l32i %1, %2, 8\n\t" | |
191 | "add %0, %0, %1\n\t" | |
192 | "bgeu %0, %1, 1f\n\t" | |
193 | "addi %0, %0, 1\n\t" | |
194 | "1:\t" | |
195 | "l32i %1, %2, 12\n\t" | |
196 | "add %0, %0, %1\n\t" | |
197 | "bgeu %0, %1, 1f\n\t" | |
198 | "addi %0, %0, 1\n\t" | |
199 | "1:\t" | |
200 | "l32i %1, %3, 0\n\t" | |
201 | "add %0, %0, %1\n\t" | |
202 | "bgeu %0, %1, 1f\n\t" | |
203 | "addi %0, %0, 1\n\t" | |
204 | "1:\t" | |
205 | "l32i %1, %3, 4\n\t" | |
206 | "add %0, %0, %1\n\t" | |
207 | "bgeu %0, %1, 1f\n\t" | |
208 | "addi %0, %0, 1\n\t" | |
209 | "1:\t" | |
210 | "l32i %1, %3, 8\n\t" | |
211 | "add %0, %0, %1\n\t" | |
212 | "bgeu %0, %1, 1f\n\t" | |
213 | "addi %0, %0, 1\n\t" | |
214 | "1:\t" | |
215 | "l32i %1, %3, 12\n\t" | |
216 | "add %0, %0, %1\n\t" | |
217 | "bgeu %0, %1, 1f\n\t" | |
218 | "addi %0, %0, 1\n\t" | |
219 | "1:\t" | |
220 | "add %0, %0, %4\n\t" | |
221 | "bgeu %0, %4, 1f\n\t" | |
222 | "addi %0, %0, 1\n\t" | |
223 | "1:\t" | |
224 | "add %0, %0, %5\n\t" | |
225 | "bgeu %0, %5, 1f\n\t" | |
226 | "addi %0, %0, 1\n\t" | |
227 | "1:\t" | |
228 | : "=r" (sum), "=&r" (__dummy) | |
229 | : "r" (saddr), "r" (daddr), | |
230 | "r" (htonl(len)), "r" (htonl(proto)), "0" (sum)); | |
231 | ||
232 | return csum_fold(sum); | |
233 | } | |
234 | ||
235 | /* | |
236 | * Copy and checksum to user | |
237 | */ | |
238 | #define HAVE_CSUM_COPY_USER | |
b8e4e01d AV |
239 | static __inline__ __wsum csum_and_copy_to_user(const void *src, void __user *dst, |
240 | int len, __wsum sum, int *err_ptr) | |
9a8fd558 CZ |
241 | { |
242 | if (access_ok(VERIFY_WRITE, dst, len)) | |
243 | return csum_partial_copy_generic(src, dst, len, sum, NULL, err_ptr); | |
244 | ||
245 | if (len) | |
246 | *err_ptr = -EFAULT; | |
247 | ||
b8e4e01d | 248 | return (__force __wsum)-1; /* invalid checksum */ |
9a8fd558 CZ |
249 | } |
250 | #endif |