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1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _M68K_CHECKSUM_H
3 #define _M68K_CHECKSUM_H
7 #ifdef CONFIG_GENERIC_CSUM
8 #include <asm-generic/checksum.h>
12 * computes the checksum of a memory block at buff, length len,
13 * and adds in "sum" (32-bit)
15 * returns a 32-bit number suitable for feeding into itself
16 * or csum_tcpudp_magic
18 * this function must be called with even lengths, except
19 * for the last fragment, which may be odd
21 * it's best to have buff aligned on a 32-bit boundary
23 __wsum
csum_partial(const void *buff
, int len
, __wsum sum
);
26 * the same as csum_partial, but copies from src while it
29 * here even more important to align src and dst on a 32-bit (or even
30 * better 64-bit) boundary
33 #define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
34 #define _HAVE_ARCH_CSUM_AND_COPY
35 extern __wsum
csum_and_copy_from_user(const void __user
*src
,
40 extern __wsum
csum_partial_copy_nocheck(const void *src
,
45 * This is a version of ip_fast_csum() optimized for IP headers,
46 * which always checksum on 4 octet boundaries.
48 static inline __sum16
ip_fast_csum(const void *iph
, unsigned int ihl
)
53 __asm__ ("subqw #1,%2\n"
63 : "=d" (sum
), "=&a" (iph
), "=&d" (ihl
), "=&d" (tmp
)
64 : "0" (sum
), "1" (iph
), "2" (ihl
)
66 return (__force __sum16
)~sum
;
69 static inline __sum16
csum_fold(__wsum sum
)
71 unsigned int tmp
= (__force u32
)sum
;
77 : "=&d" (sum
), "=&d" (tmp
)
78 : "0" (sum
), "1" (tmp
));
80 return (__force __sum16
)~sum
;
84 csum_tcpudp_nofold(__be32 saddr
, __be32 daddr
, unsigned short len
,
85 unsigned short proto
, __wsum sum
)
87 __asm__ ("addl %2,%0\n\t"
92 : "=&d" (sum
), "=d" (saddr
)
93 : "g" (daddr
), "1" (saddr
), "d" (len
+ proto
),
100 * computes the checksum of the TCP/UDP pseudo-header
101 * returns a 16-bit checksum, already complemented
103 static inline __sum16
104 csum_tcpudp_magic(__be32 saddr
, __be32 daddr
, unsigned short len
,
105 unsigned short proto
, __wsum sum
)
107 return csum_fold(csum_tcpudp_nofold(saddr
,daddr
,len
,proto
,sum
));
111 * this routine is used for miscellaneous IP-like checksums, mainly
115 static inline __sum16
ip_compute_csum(const void *buff
, int len
)
117 return csum_fold (csum_partial(buff
, len
, 0));
120 #define _HAVE_ARCH_IPV6_CSUM
121 static __inline__ __sum16
122 csum_ipv6_magic(const struct in6_addr
*saddr
, const struct in6_addr
*daddr
,
123 __u32 len
, __u8 proto
, __wsum sum
)
125 register unsigned long tmp
;
126 __asm__("addl %2@,%0\n\t"
127 "movel %2@(4),%1\n\t"
129 "movel %2@(8),%1\n\t"
131 "movel %2@(12),%1\n\t"
135 "movel %3@(4),%1\n\t"
137 "movel %3@(8),%1\n\t"
139 "movel %3@(12),%1\n\t"
144 : "=&d" (sum
), "=&d" (tmp
)
145 : "a" (saddr
), "a" (daddr
), "d" (len
+ proto
),
148 return csum_fold(sum
);
151 #endif /* CONFIG_GENERIC_CSUM */
152 #endif /* _M68K_CHECKSUM_H */