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Linux/arch/sparc/include/asm/checksum_32.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  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 <linux/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  */
 33 __wsum csum_partial(const void *buff, int len, __wsum sum);
 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 unsigned int __csum_partial_copy_sparc_generic (const unsigned char *, unsigned char *);
 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         : "" (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         : "" (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(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                 : "" (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                              : "" (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,
174                                         __u32 len, __u8 proto,
175                                         __wsum sum)
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), "" (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,
193                                         __u32 len, __u8 proto,
194                                         __wsum sum)
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,
203                                       __u32 len, __u8 proto, __wsum sum)
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 
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), "" (csum));
247 
248         return csum;
249 }
250 
251 #endif /* !(__SPARC_CHECKSUM_H) */
252 

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