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1da177e4 LT |
1 | /* $Id: checksum.h,v 1.33 2002/02/01 22:01:05 davem Exp $ */ |
2 | #ifndef __SPARC_CHECKSUM_H | |
3 | #define __SPARC_CHECKSUM_H | |
4 | ||
5 | /* checksum.h: IP/UDP/TCP checksum routines on the Sparc. | |
6 | * | |
7 | * Copyright(C) 1995 Linus Torvalds | |
8 | * Copyright(C) 1995 Miguel de Icaza | |
9 | * Copyright(C) 1996 David S. Miller | |
10 | * Copyright(C) 1996 Eddie C. Dost | |
11 | * Copyright(C) 1997 Jakub Jelinek | |
12 | * | |
13 | * derived from: | |
14 | * Alpha checksum c-code | |
15 | * ix86 inline assembly | |
16 | * RFC1071 Computing the Internet Checksum | |
17 | */ | |
18 | ||
19 | #include <linux/in6.h> | |
20 | #include <asm/uaccess.h> | |
21 | ||
22 | /* computes the checksum of a memory block at buff, length len, | |
23 | * and adds in "sum" (32-bit) | |
24 | * | |
25 | * returns a 32-bit number suitable for feeding into itself | |
26 | * or csum_tcpudp_magic | |
27 | * | |
28 | * this function must be called with even lengths, except | |
29 | * for the last fragment, which may be odd | |
30 | * | |
31 | * it's best to have buff aligned on a 32-bit boundary | |
32 | */ | |
16ec7e16 | 33 | extern __wsum csum_partial(const void *buff, int len, __wsum sum); |
1da177e4 LT |
34 | |
35 | /* the same as csum_partial, but copies from fs:src while it | |
36 | * checksums | |
37 | * | |
38 | * here even more important to align src and dst on a 32-bit (or even | |
39 | * better 64-bit) boundary | |
40 | */ | |
41 | ||
42 | extern unsigned int __csum_partial_copy_sparc_generic (const unsigned char *, unsigned char *); | |
43 | ||
16ec7e16 AV |
44 | static inline __wsum |
45 | csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum) | |
1da177e4 LT |
46 | { |
47 | register unsigned int ret asm("o0") = (unsigned int)src; | |
48 | register char *d asm("o1") = dst; | |
49 | register int l asm("g1") = len; | |
50 | ||
51 | __asm__ __volatile__ ( | |
52 | "call __csum_partial_copy_sparc_generic\n\t" | |
53 | " mov %6, %%g7\n" | |
54 | : "=&r" (ret), "=&r" (d), "=&r" (l) | |
55 | : "0" (ret), "1" (d), "2" (l), "r" (sum) | |
56 | : "o2", "o3", "o4", "o5", "o7", | |
57 | "g2", "g3", "g4", "g5", "g7", | |
58 | "memory", "cc"); | |
16ec7e16 | 59 | return (__force __wsum)ret; |
1da177e4 LT |
60 | } |
61 | ||
16ec7e16 AV |
62 | static inline __wsum |
63 | csum_partial_copy_from_user(const void __user *src, void *dst, int len, | |
64 | __wsum sum, int *err) | |
1da177e4 | 65 | { |
16ec7e16 AV |
66 | register unsigned long ret asm("o0") = (unsigned long)src; |
67 | register char *d asm("o1") = dst; | |
68 | register int l asm("g1") = len; | |
69 | register __wsum s asm("g7") = sum; | |
1da177e4 | 70 | |
16ec7e16 AV |
71 | __asm__ __volatile__ ( |
72 | ".section __ex_table,#alloc\n\t" | |
73 | ".align 4\n\t" | |
74 | ".word 1f,2\n\t" | |
75 | ".previous\n" | |
76 | "1:\n\t" | |
77 | "call __csum_partial_copy_sparc_generic\n\t" | |
78 | " st %8, [%%sp + 64]\n" | |
79 | : "=&r" (ret), "=&r" (d), "=&r" (l), "=&r" (s) | |
80 | : "0" (ret), "1" (d), "2" (l), "3" (s), "r" (err) | |
81 | : "o2", "o3", "o4", "o5", "o7", "g2", "g3", "g4", "g5", | |
82 | "cc", "memory"); | |
83 | return (__force __wsum)ret; | |
84 | } | |
1da177e4 | 85 | |
16ec7e16 AV |
86 | static inline __wsum |
87 | csum_partial_copy_to_user(const void *src, void __user *dst, int len, | |
88 | __wsum sum, int *err) | |
1da177e4 LT |
89 | { |
90 | if (!access_ok (VERIFY_WRITE, dst, len)) { | |
91 | *err = -EFAULT; | |
92 | return sum; | |
93 | } else { | |
94 | register unsigned long ret asm("o0") = (unsigned long)src; | |
95 | register char __user *d asm("o1") = dst; | |
96 | register int l asm("g1") = len; | |
16ec7e16 | 97 | register __wsum s asm("g7") = sum; |
1da177e4 LT |
98 | |
99 | __asm__ __volatile__ ( | |
100 | ".section __ex_table,#alloc\n\t" | |
101 | ".align 4\n\t" | |
102 | ".word 1f,1\n\t" | |
103 | ".previous\n" | |
104 | "1:\n\t" | |
105 | "call __csum_partial_copy_sparc_generic\n\t" | |
106 | " st %8, [%%sp + 64]\n" | |
107 | : "=&r" (ret), "=&r" (d), "=&r" (l), "=&r" (s) | |
108 | : "0" (ret), "1" (d), "2" (l), "3" (s), "r" (err) | |
109 | : "o2", "o3", "o4", "o5", "o7", | |
110 | "g2", "g3", "g4", "g5", | |
111 | "cc", "memory"); | |
16ec7e16 | 112 | return (__force __wsum)ret; |
1da177e4 LT |
113 | } |
114 | } | |
115 | ||
116 | #define HAVE_CSUM_COPY_USER | |
117 | #define csum_and_copy_to_user csum_partial_copy_to_user | |
118 | ||
119 | /* ihl is always 5 or greater, almost always is 5, and iph is word aligned | |
120 | * the majority of the time. | |
121 | */ | |
16ec7e16 | 122 | static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) |
1da177e4 | 123 | { |
16ec7e16 | 124 | __sum16 sum; |
1da177e4 LT |
125 | |
126 | /* Note: We must read %2 before we touch %0 for the first time, | |
127 | * because GCC can legitimately use the same register for | |
128 | * both operands. | |
129 | */ | |
130 | __asm__ __volatile__("sub\t%2, 4, %%g4\n\t" | |
131 | "ld\t[%1 + 0x00], %0\n\t" | |
132 | "ld\t[%1 + 0x04], %%g2\n\t" | |
133 | "ld\t[%1 + 0x08], %%g3\n\t" | |
134 | "addcc\t%%g2, %0, %0\n\t" | |
135 | "addxcc\t%%g3, %0, %0\n\t" | |
136 | "ld\t[%1 + 0x0c], %%g2\n\t" | |
137 | "ld\t[%1 + 0x10], %%g3\n\t" | |
138 | "addxcc\t%%g2, %0, %0\n\t" | |
139 | "addx\t%0, %%g0, %0\n" | |
140 | "1:\taddcc\t%%g3, %0, %0\n\t" | |
141 | "add\t%1, 4, %1\n\t" | |
142 | "addxcc\t%0, %%g0, %0\n\t" | |
143 | "subcc\t%%g4, 1, %%g4\n\t" | |
144 | "be,a\t2f\n\t" | |
145 | "sll\t%0, 16, %%g2\n\t" | |
146 | "b\t1b\n\t" | |
147 | "ld\t[%1 + 0x10], %%g3\n" | |
148 | "2:\taddcc\t%0, %%g2, %%g2\n\t" | |
149 | "srl\t%%g2, 16, %0\n\t" | |
150 | "addx\t%0, %%g0, %0\n\t" | |
151 | "xnor\t%%g0, %0, %0" | |
152 | : "=r" (sum), "=&r" (iph) | |
153 | : "r" (ihl), "1" (iph) | |
51bcf092 | 154 | : "g2", "g3", "g4", "cc", "memory"); |
1da177e4 LT |
155 | return sum; |
156 | } | |
157 | ||
158 | /* Fold a partial checksum without adding pseudo headers. */ | |
16ec7e16 | 159 | static inline __sum16 csum_fold(__wsum sum) |
1da177e4 LT |
160 | { |
161 | unsigned int tmp; | |
162 | ||
163 | __asm__ __volatile__("addcc\t%0, %1, %1\n\t" | |
164 | "srl\t%1, 16, %1\n\t" | |
165 | "addx\t%1, %%g0, %1\n\t" | |
166 | "xnor\t%%g0, %1, %0" | |
167 | : "=&r" (sum), "=r" (tmp) | |
16ec7e16 | 168 | : "0" (sum), "1" ((__force u32)sum<<16) |
1da177e4 | 169 | : "cc"); |
16ec7e16 | 170 | return (__force __sum16)sum; |
1da177e4 LT |
171 | } |
172 | ||
16ec7e16 AV |
173 | static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, |
174 | unsigned short len, | |
1da177e4 | 175 | unsigned short proto, |
16ec7e16 | 176 | __wsum sum) |
1da177e4 LT |
177 | { |
178 | __asm__ __volatile__("addcc\t%1, %0, %0\n\t" | |
179 | "addxcc\t%2, %0, %0\n\t" | |
180 | "addxcc\t%3, %0, %0\n\t" | |
181 | "addx\t%0, %%g0, %0\n\t" | |
182 | : "=r" (sum), "=r" (saddr) | |
16ec7e16 | 183 | : "r" (daddr), "r" (proto + len), "0" (sum), |
1da177e4 LT |
184 | "1" (saddr) |
185 | : "cc"); | |
186 | return sum; | |
187 | } | |
188 | ||
189 | /* | |
190 | * computes the checksum of the TCP/UDP pseudo-header | |
191 | * returns a 16-bit checksum, already complemented | |
192 | */ | |
16ec7e16 | 193 | static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, |
1da177e4 LT |
194 | unsigned short len, |
195 | unsigned short proto, | |
16ec7e16 | 196 | __wsum sum) |
1da177e4 LT |
197 | { |
198 | return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); | |
199 | } | |
200 | ||
201 | #define _HAVE_ARCH_IPV6_CSUM | |
202 | ||
16ec7e16 AV |
203 | static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr, |
204 | const struct in6_addr *daddr, | |
205 | __u32 len, unsigned short proto, | |
206 | __wsum sum) | |
1da177e4 LT |
207 | { |
208 | __asm__ __volatile__ ( | |
209 | "addcc %3, %4, %%g4\n\t" | |
210 | "addxcc %5, %%g4, %%g4\n\t" | |
211 | "ld [%2 + 0x0c], %%g2\n\t" | |
212 | "ld [%2 + 0x08], %%g3\n\t" | |
213 | "addxcc %%g2, %%g4, %%g4\n\t" | |
214 | "ld [%2 + 0x04], %%g2\n\t" | |
215 | "addxcc %%g3, %%g4, %%g4\n\t" | |
216 | "ld [%2 + 0x00], %%g3\n\t" | |
217 | "addxcc %%g2, %%g4, %%g4\n\t" | |
218 | "ld [%1 + 0x0c], %%g2\n\t" | |
219 | "addxcc %%g3, %%g4, %%g4\n\t" | |
220 | "ld [%1 + 0x08], %%g3\n\t" | |
221 | "addxcc %%g2, %%g4, %%g4\n\t" | |
222 | "ld [%1 + 0x04], %%g2\n\t" | |
223 | "addxcc %%g3, %%g4, %%g4\n\t" | |
224 | "ld [%1 + 0x00], %%g3\n\t" | |
225 | "addxcc %%g2, %%g4, %%g4\n\t" | |
226 | "addxcc %%g3, %%g4, %0\n\t" | |
227 | "addx 0, %0, %0\n" | |
228 | : "=&r" (sum) | |
229 | : "r" (saddr), "r" (daddr), | |
230 | "r"(htonl(len)), "r"(htonl(proto)), "r"(sum) | |
231 | : "g2", "g3", "g4", "cc"); | |
232 | ||
233 | return csum_fold(sum); | |
234 | } | |
235 | ||
236 | /* this routine is used for miscellaneous IP-like checksums, mainly in icmp.c */ | |
16ec7e16 | 237 | static inline __sum16 ip_compute_csum(const void *buff, int len) |
1da177e4 LT |
238 | { |
239 | return csum_fold(csum_partial(buff, len, 0)); | |
240 | } | |
241 | ||
242 | #endif /* !(__SPARC_CHECKSUM_H) */ |