1 #ifndef _M68K_CHECKSUM_H
2 #define _M68K_CHECKSUM_H
5 * computes the checksum of a memory block at buff, length len,
6 * and adds in "sum" (32-bit)
8 * returns a 32-bit number suitable for feeding into itself
11 * this function must be called with even lengths, except
12 * for the last fragment, which may be odd
14 * it's best to have buff aligned on a 32-bit boundary
16 unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
19 * the same as csum_partial, but copies from src while it
22 * here even more important to align src and dst on a 32-bit (or even
23 * better 64-bit) boundary
26 unsigned int csum_partial_copy(const char *src, char *dst, int len, int sum);
30 * the same as csum_partial_copy, but copies from user space.
32 * here even more important to align src and dst on a 32-bit (or even
33 * better 64-bit) boundary
36 extern unsigned int csum_partial_copy_from_user(const char *src, char *dst,
37 int len, int sum, int *csum_err);
39 #define csum_partial_copy_nocheck(src, dst, len, sum) \
40 csum_partial_copy((src), (dst), (len), (sum))
42 unsigned short ip_fast_csum(unsigned char *iph, unsigned int ihl);
45 * Fold a partial checksum
48 static inline unsigned int csum_fold(unsigned int sum)
50 #ifdef CONFIG_COLDFIRE
51 sum = (sum & 0xffff) + (sum >> 16);
52 sum = (sum & 0xffff) + (sum >> 16);
54 unsigned int tmp = sum;
59 : "=&d" (sum), "=&d" (tmp)
60 : "0" (sum), "1" (sum));
67 * computes the checksum of the TCP/UDP pseudo-header
68 * returns a 16-bit checksum, already complemented
71 static inline unsigned int
72 csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len,
73 unsigned short proto, unsigned int sum)
75 __asm__ ("addl %1,%0\n\t"
80 : "=&d" (sum), "=&d" (saddr)
81 : "0" (daddr), "1" (saddr), "d" (len + proto),
86 static inline unsigned short int
87 csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len,
88 unsigned short proto, unsigned int sum)
90 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
94 * this routine is used for miscellaneous IP-like checksums, mainly
98 extern unsigned short ip_compute_csum(const unsigned char * buff, int len);
100 #define _HAVE_ARCH_IPV6_CSUM
101 static __inline__ unsigned short int
102 csum_ipv6_magic(struct in6_addr *saddr, struct in6_addr *daddr,
103 __u32 len, unsigned short proto, unsigned int sum)
105 register unsigned long tmp;
106 __asm__("addl %2@,%0\n\t"
107 "movel %2@(4),%1\n\t"
109 "movel %2@(8),%1\n\t"
111 "movel %2@(12),%1\n\t"
115 "movel %3@(4),%1\n\t"
117 "movel %3@(8),%1\n\t"
119 "movel %3@(12),%1\n\t"
124 : "=&d" (sum), "=&d" (tmp)
125 : "a" (saddr), "a" (daddr), "d" (len + proto),
128 return csum_fold(sum);
131 #endif /* _M68K_CHECKSUM_H */