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,
39 extern __wsum csum_partial_copy_nocheck(const void *src,
43 * This is a version of ip_fast_csum() optimized for IP headers,
44 * which always checksum on 4 octet boundaries.
46 static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
51 __asm__ ("subqw #1,%2\n"
61 : "=d" (sum), "=&a" (iph), "=&d" (ihl), "=&d" (tmp)
62 : "0" (sum), "1" (iph), "2" (ihl)
64 return (__force __sum16)~sum;
67 static inline __sum16 csum_fold(__wsum sum)
69 unsigned int tmp = (__force u32)sum;
75 : "=&d" (sum), "=&d" (tmp)
76 : "0" (sum), "1" (tmp));
78 return (__force __sum16)~sum;
82 csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
83 unsigned short proto, __wsum sum)
85 __asm__ ("addl %2,%0\n\t"
90 : "=&d" (sum), "=d" (saddr)
91 : "g" (daddr), "1" (saddr), "d" (len + proto),
98 * computes the checksum of the TCP/UDP pseudo-header
99 * returns a 16-bit checksum, already complemented
101 static inline __sum16
102 csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len,
103 unsigned short proto, __wsum sum)
105 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
109 * this routine is used for miscellaneous IP-like checksums, mainly
113 static inline __sum16 ip_compute_csum(const void *buff, int len)
115 return csum_fold (csum_partial(buff, len, 0));
118 #define _HAVE_ARCH_IPV6_CSUM
119 static __inline__ __sum16
120 csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr,
121 __u32 len, __u8 proto, __wsum sum)
123 register unsigned long tmp;
124 __asm__("addl %2@,%0\n\t"
125 "movel %2@(4),%1\n\t"
127 "movel %2@(8),%1\n\t"
129 "movel %2@(12),%1\n\t"
133 "movel %3@(4),%1\n\t"
135 "movel %3@(8),%1\n\t"
137 "movel %3@(12),%1\n\t"
142 : "=&d" (sum), "=&d" (tmp)
143 : "a" (saddr), "a" (daddr), "d" (len + proto),
146 return csum_fold(sum);
149 #endif /* CONFIG_GENERIC_CSUM */
150 #endif /* _M68K_CHECKSUM_H */