1 #ifndef _M68K_CHECKSUM_H
2 #define _M68K_CHECKSUM_H
7 * computes the checksum of a memory block at buff, length len,
8 * and adds in "sum" (32-bit)
10 * returns a 32-bit number suitable for feeding into itself
11 * or csum_tcpudp_magic
13 * this function must be called with even lengths, except
14 * for the last fragment, which may be odd
16 * it's best to have buff aligned on a 32-bit boundary
18 __wsum csum_partial(const void *buff, int len, __wsum sum);
21 * the same as csum_partial, but copies from src while it
24 * here even more important to align src and dst on a 32-bit (or even
25 * better 64-bit) boundary
28 extern __wsum csum_partial_copy_from_user(const void __user *src,
33 extern __wsum csum_partial_copy_nocheck(const void *src,
38 * This is a version of ip_compute_csum() optimized for IP headers,
39 * which always checksum on 4 octet boundaries.
42 static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
47 __asm__ ("subqw #1,%2\n"
57 : "=d" (sum), "=&a" (iph), "=&d" (ihl), "=&d" (tmp)
58 : "0" (sum), "1" (iph), "2" (ihl)
60 return (__force __sum16)~sum;
64 * Fold a partial checksum
67 static inline __sum16 csum_fold(__wsum sum)
69 unsigned int tmp = (__force u32)sum;
74 : "=&d" (sum), "=&d" (tmp)
75 : "0" (sum), "1" (tmp));
76 return (__force __sum16)~sum;
81 csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
82 unsigned short proto, __wsum sum)
84 __asm__ ("addl %2,%0\n\t"
89 : "=&d" (sum), "=d" (saddr)
90 : "g" (daddr), "1" (saddr), "d" (len + proto),
97 * computes the checksum of the TCP/UDP pseudo-header
98 * returns a 16-bit checksum, already complemented
100 static inline __sum16
101 csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len,
102 unsigned short proto, __wsum sum)
104 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
108 * this routine is used for miscellaneous IP-like checksums, mainly
112 static inline __sum16 ip_compute_csum(const void *buff, int len)
114 return csum_fold (csum_partial(buff, len, 0));
117 #define _HAVE_ARCH_IPV6_CSUM
118 static __inline__ __sum16
119 csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr,
120 __u32 len, unsigned short proto, __wsum sum)
122 register unsigned long tmp;
123 __asm__("addl %2@,%0\n\t"
124 "movel %2@(4),%1\n\t"
126 "movel %2@(8),%1\n\t"
128 "movel %2@(12),%1\n\t"
132 "movel %3@(4),%1\n\t"
134 "movel %3@(8),%1\n\t"
136 "movel %3@(12),%1\n\t"
141 : "=&d" (sum), "=&d" (tmp)
142 : "a" (saddr), "a" (daddr), "d" (len + proto),
145 return csum_fold(sum);
148 #endif /* _M68K_CHECKSUM_H */