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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
5 /* checksum.h: IP/UDP/TCP checksum routines on the Sparc.
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
14 * Alpha checksum c-code
15 * ix86 inline assembly
16 * RFC1071 Computing the Internet Checksum
19 #include <linux/in6.h>
20 #include <asm/uaccess.h>
22 /* computes the checksum of a memory block at buff, length len,
23 * and adds in "sum" (32-bit)
25 * returns a 32-bit number suitable for feeding into itself
26 * or csum_tcpudp_magic
28 * this function must be called with even lengths, except
29 * for the last fragment, which may be odd
31 * it's best to have buff aligned on a 32-bit boundary
33 extern unsigned int csum_partial(const unsigned char * buff
, int len
, unsigned int sum
);
35 /* the same as csum_partial, but copies from fs:src while it
38 * here even more important to align src and dst on a 32-bit (or even
39 * better 64-bit) boundary
42 extern unsigned int __csum_partial_copy_sparc_generic (const unsigned char *, unsigned char *);
44 static inline unsigned int
45 csum_partial_copy_nocheck (const unsigned char *src
, unsigned char *dst
, int len
,
48 register unsigned int ret
asm("o0") = (unsigned int)src
;
49 register char *d
asm("o1") = dst
;
50 register int l
asm("g1") = len
;
52 __asm__
__volatile__ (
53 "call __csum_partial_copy_sparc_generic\n\t"
55 : "=&r" (ret
), "=&r" (d
), "=&r" (l
)
56 : "0" (ret
), "1" (d
), "2" (l
), "r" (sum
)
57 : "o2", "o3", "o4", "o5", "o7",
58 "g2", "g3", "g4", "g5", "g7",
63 static inline unsigned int
64 csum_partial_copy_from_user(const unsigned char __user
*src
, unsigned char *dst
, int len
,
65 unsigned int sum
, int *err
)
67 if (!access_ok (VERIFY_READ
, src
, len
)) {
72 register unsigned long ret
asm("o0") = (unsigned long)src
;
73 register char *d
asm("o1") = dst
;
74 register int l
asm("g1") = len
;
75 register unsigned int s
asm("g7") = sum
;
77 __asm__
__volatile__ (
78 ".section __ex_table,#alloc\n\t"
83 "call __csum_partial_copy_sparc_generic\n\t"
84 " st %8, [%%sp + 64]\n"
85 : "=&r" (ret
), "=&r" (d
), "=&r" (l
), "=&r" (s
)
86 : "0" (ret
), "1" (d
), "2" (l
), "3" (s
), "r" (err
)
87 : "o2", "o3", "o4", "o5", "o7", "g2", "g3", "g4", "g5",
93 static inline unsigned int
94 csum_partial_copy_to_user(const unsigned char *src
, unsigned char __user
*dst
, int len
,
95 unsigned int sum
, int *err
)
97 if (!access_ok (VERIFY_WRITE
, dst
, len
)) {
101 register unsigned long ret
asm("o0") = (unsigned long)src
;
102 register char __user
*d
asm("o1") = dst
;
103 register int l
asm("g1") = len
;
104 register unsigned int s
asm("g7") = sum
;
106 __asm__
__volatile__ (
107 ".section __ex_table,#alloc\n\t"
112 "call __csum_partial_copy_sparc_generic\n\t"
113 " st %8, [%%sp + 64]\n"
114 : "=&r" (ret
), "=&r" (d
), "=&r" (l
), "=&r" (s
)
115 : "0" (ret
), "1" (d
), "2" (l
), "3" (s
), "r" (err
)
116 : "o2", "o3", "o4", "o5", "o7",
117 "g2", "g3", "g4", "g5",
123 #define HAVE_CSUM_COPY_USER
124 #define csum_and_copy_to_user csum_partial_copy_to_user
126 /* ihl is always 5 or greater, almost always is 5, and iph is word aligned
127 * the majority of the time.
129 static inline unsigned short ip_fast_csum(const unsigned char *iph
,
134 /* Note: We must read %2 before we touch %0 for the first time,
135 * because GCC can legitimately use the same register for
138 __asm__
__volatile__("sub\t%2, 4, %%g4\n\t"
139 "ld\t[%1 + 0x00], %0\n\t"
140 "ld\t[%1 + 0x04], %%g2\n\t"
141 "ld\t[%1 + 0x08], %%g3\n\t"
142 "addcc\t%%g2, %0, %0\n\t"
143 "addxcc\t%%g3, %0, %0\n\t"
144 "ld\t[%1 + 0x0c], %%g2\n\t"
145 "ld\t[%1 + 0x10], %%g3\n\t"
146 "addxcc\t%%g2, %0, %0\n\t"
147 "addx\t%0, %%g0, %0\n"
148 "1:\taddcc\t%%g3, %0, %0\n\t"
150 "addxcc\t%0, %%g0, %0\n\t"
151 "subcc\t%%g4, 1, %%g4\n\t"
153 "sll\t%0, 16, %%g2\n\t"
155 "ld\t[%1 + 0x10], %%g3\n"
156 "2:\taddcc\t%0, %%g2, %%g2\n\t"
157 "srl\t%%g2, 16, %0\n\t"
158 "addx\t%0, %%g0, %0\n\t"
160 : "=r" (sum
), "=&r" (iph
)
161 : "r" (ihl
), "1" (iph
)
162 : "g2", "g3", "g4", "cc");
166 /* Fold a partial checksum without adding pseudo headers. */
167 static inline unsigned int csum_fold(unsigned int sum
)
171 __asm__
__volatile__("addcc\t%0, %1, %1\n\t"
172 "srl\t%1, 16, %1\n\t"
173 "addx\t%1, %%g0, %1\n\t"
175 : "=&r" (sum
), "=r" (tmp
)
176 : "0" (sum
), "1" (sum
<<16)
181 static inline unsigned long csum_tcpudp_nofold(unsigned long saddr
,
184 unsigned short proto
,
187 __asm__
__volatile__("addcc\t%1, %0, %0\n\t"
188 "addxcc\t%2, %0, %0\n\t"
189 "addxcc\t%3, %0, %0\n\t"
190 "addx\t%0, %%g0, %0\n\t"
191 : "=r" (sum
), "=r" (saddr
)
192 : "r" (daddr
), "r" ((proto
<<16)+len
), "0" (sum
),
199 * computes the checksum of the TCP/UDP pseudo-header
200 * returns a 16-bit checksum, already complemented
202 static inline unsigned short int csum_tcpudp_magic(unsigned long saddr
,
205 unsigned short proto
,
208 return csum_fold(csum_tcpudp_nofold(saddr
,daddr
,len
,proto
,sum
));
211 #define _HAVE_ARCH_IPV6_CSUM
213 static inline unsigned short int csum_ipv6_magic(struct in6_addr
*saddr
,
214 struct in6_addr
*daddr
,
216 unsigned short proto
,
219 __asm__
__volatile__ (
220 "addcc %3, %4, %%g4\n\t"
221 "addxcc %5, %%g4, %%g4\n\t"
222 "ld [%2 + 0x0c], %%g2\n\t"
223 "ld [%2 + 0x08], %%g3\n\t"
224 "addxcc %%g2, %%g4, %%g4\n\t"
225 "ld [%2 + 0x04], %%g2\n\t"
226 "addxcc %%g3, %%g4, %%g4\n\t"
227 "ld [%2 + 0x00], %%g3\n\t"
228 "addxcc %%g2, %%g4, %%g4\n\t"
229 "ld [%1 + 0x0c], %%g2\n\t"
230 "addxcc %%g3, %%g4, %%g4\n\t"
231 "ld [%1 + 0x08], %%g3\n\t"
232 "addxcc %%g2, %%g4, %%g4\n\t"
233 "ld [%1 + 0x04], %%g2\n\t"
234 "addxcc %%g3, %%g4, %%g4\n\t"
235 "ld [%1 + 0x00], %%g3\n\t"
236 "addxcc %%g2, %%g4, %%g4\n\t"
237 "addxcc %%g3, %%g4, %0\n\t"
240 : "r" (saddr
), "r" (daddr
),
241 "r"(htonl(len
)), "r"(htonl(proto
)), "r"(sum
)
242 : "g2", "g3", "g4", "cc");
244 return csum_fold(sum
);
247 /* this routine is used for miscellaneous IP-like checksums, mainly in icmp.c */
248 static inline unsigned short ip_compute_csum(unsigned char * buff
, int len
)
250 return csum_fold(csum_partial(buff
, len
, 0));
253 #endif /* !(__SPARC_CHECKSUM_H) */