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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
f5e706ad SR |
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> | |
7c0f6ba6 | 20 | #include <linux/uaccess.h> |
f5e706ad SR |
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 | */ | |
f05a6865 | 33 | __wsum csum_partial(const void *buff, int len, __wsum sum); |
f5e706ad SR |
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 | ||
f05a6865 | 42 | unsigned int __csum_partial_copy_sparc_generic (const unsigned char *, unsigned char *); |
f5e706ad SR |
43 | |
44 | static inline __wsum | |
45 | csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum) | |
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"); | |
59 | return (__force __wsum)ret; | |
60 | } | |
61 | ||
62 | static inline __wsum | |
63 | csum_partial_copy_from_user(const void __user *src, void *dst, int len, | |
64 | __wsum sum, int *err) | |
65 | { | |
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; | |
70 | ||
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 | } | |
85 | ||
86 | static inline __wsum | |
87 | csum_partial_copy_to_user(const void *src, void __user *dst, int len, | |
88 | __wsum sum, int *err) | |
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; | |
97 | register __wsum s asm("g7") = sum; | |
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"); | |
112 | return (__force __wsum)ret; | |
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 | */ | |
122 | static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) | |
123 | { | |
124 | __sum16 sum; | |
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) | |
154 | : "g2", "g3", "g4", "cc", "memory"); | |
155 | return sum; | |
156 | } | |
157 | ||
158 | /* Fold a partial checksum without adding pseudo headers. */ | |
159 | static inline __sum16 csum_fold(__wsum sum) | |
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) | |
168 | : "0" (sum), "1" ((__force u32)sum<<16) | |
169 | : "cc"); | |
170 | return (__force __sum16)sum; | |
171 | } | |
172 | ||
173 | static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, | |
01cfbad7 AD |
174 | __u32 len, __u8 proto, |
175 | __wsum sum) | |
f5e706ad SR |
176 | { |
177 | __asm__ __volatile__("addcc\t%1, %0, %0\n\t" | |
178 | "addxcc\t%2, %0, %0\n\t" | |
179 | "addxcc\t%3, %0, %0\n\t" | |
180 | "addx\t%0, %%g0, %0\n\t" | |
181 | : "=r" (sum), "=r" (saddr) | |
182 | : "r" (daddr), "r" (proto + len), "0" (sum), | |
183 | "1" (saddr) | |
184 | : "cc"); | |
185 | return sum; | |
186 | } | |
187 | ||
188 | /* | |
189 | * computes the checksum of the TCP/UDP pseudo-header | |
190 | * returns a 16-bit checksum, already complemented | |
191 | */ | |
192 | static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, | |
01cfbad7 AD |
193 | __u32 len, __u8 proto, |
194 | __wsum sum) | |
f5e706ad SR |
195 | { |
196 | return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); | |
197 | } | |
198 | ||
199 | #define _HAVE_ARCH_IPV6_CSUM | |
200 | ||
201 | static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr, | |
202 | const struct in6_addr *daddr, | |
1e940829 | 203 | __u32 len, __u8 proto, __wsum sum) |
f5e706ad SR |
204 | { |
205 | __asm__ __volatile__ ( | |
206 | "addcc %3, %4, %%g4\n\t" | |
207 | "addxcc %5, %%g4, %%g4\n\t" | |
208 | "ld [%2 + 0x0c], %%g2\n\t" | |
209 | "ld [%2 + 0x08], %%g3\n\t" | |
210 | "addxcc %%g2, %%g4, %%g4\n\t" | |
211 | "ld [%2 + 0x04], %%g2\n\t" | |
212 | "addxcc %%g3, %%g4, %%g4\n\t" | |
213 | "ld [%2 + 0x00], %%g3\n\t" | |
214 | "addxcc %%g2, %%g4, %%g4\n\t" | |
215 | "ld [%1 + 0x0c], %%g2\n\t" | |
216 | "addxcc %%g3, %%g4, %%g4\n\t" | |
217 | "ld [%1 + 0x08], %%g3\n\t" | |
218 | "addxcc %%g2, %%g4, %%g4\n\t" | |
219 | "ld [%1 + 0x04], %%g2\n\t" | |
220 | "addxcc %%g3, %%g4, %%g4\n\t" | |
221 | "ld [%1 + 0x00], %%g3\n\t" | |
222 | "addxcc %%g2, %%g4, %%g4\n\t" | |
223 | "addxcc %%g3, %%g4, %0\n\t" | |
224 | "addx 0, %0, %0\n" | |
225 | : "=&r" (sum) | |
226 | : "r" (saddr), "r" (daddr), | |
227 | "r"(htonl(len)), "r"(htonl(proto)), "r"(sum) | |
228 | : "g2", "g3", "g4", "cc"); | |
229 | ||
230 | return csum_fold(sum); | |
231 | } | |
232 | ||
233 | /* this routine is used for miscellaneous IP-like checksums, mainly in icmp.c */ | |
234 | static inline __sum16 ip_compute_csum(const void *buff, int len) | |
235 | { | |
236 | return csum_fold(csum_partial(buff, len, 0)); | |
237 | } | |
238 | ||
20fce54f TH |
239 | #define HAVE_ARCH_CSUM_ADD |
240 | static inline __wsum csum_add(__wsum csum, __wsum addend) | |
241 | { | |
242 | __asm__ __volatile__( | |
243 | "addcc %0, %1, %0\n" | |
244 | "addx %0, %%g0, %0" | |
245 | : "=r" (csum) | |
246 | : "r" (addend), "0" (csum)); | |
247 | ||
248 | return csum; | |
249 | } | |
250 | ||
f5e706ad | 251 | #endif /* !(__SPARC_CHECKSUM_H) */ |