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 #ifdef CONFIG_COLDFIRE
41 * The ColdFire cores don't support all the 68k instructions used
42 * in the optimized checksum code below. So it reverts back to using
43 * more standard C coded checksums. The fast checksum code is
44 * significantly larger than the optimized version, so it is not
47 __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
49 static inline __sum16 csum_fold(__wsum sum)
51 unsigned int tmp = (__force u32)sum;
53 tmp = (tmp & 0xffff) + (tmp >> 16);
54 tmp = (tmp & 0xffff) + (tmp >> 16);
56 return (__force __sum16)~tmp;
62 * This is a version of ip_fast_csum() optimized for IP headers,
63 * which always checksum on 4 octet boundaries.
65 static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
69 #ifdef CONFIG_COLDFIRE
70 #error need to do this in CF asm
72 __asm__ ("subqw #1,%2\n"
82 : "=d" (sum), "=&a" (iph), "=&d" (ihl), "=&d" (tmp)
83 : "0" (sum), "1" (iph), "2" (ihl)
86 return (__force __sum16)~sum;
89 static inline __sum16 csum_fold(__wsum sum)
91 unsigned int tmp = (__force u32)sum;
92 #ifdef CONFIG_COLDFIRE
93 #error need to do this in CF asm
94 /*tmp = (tmp & 0xffff) + (tmp >> 16);
95 tmp = (tmp & 0xffff) + (tmp >> 16);
96 return (__force __sum16) ~tmp;*/
103 : "=&d" (sum), "=&d" (tmp)
104 : "0" (sum), "1" (tmp));
106 return (__force __sum16)~sum;
109 #endif /* CONFIG_COLDFIRE */
112 csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
113 unsigned short proto, __wsum sum)
115 __asm__ ("addl %2,%0\n\t"
120 : "=&d" (sum), "=d" (saddr)
121 : "g" (daddr), "1" (saddr), "d" (len + proto),
128 * computes the checksum of the TCP/UDP pseudo-header
129 * returns a 16-bit checksum, already complemented
131 static inline __sum16
132 csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len,
133 unsigned short proto, __wsum sum)
135 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
139 * this routine is used for miscellaneous IP-like checksums, mainly
143 static inline __sum16 ip_compute_csum(const void *buff, int len)
145 return csum_fold (csum_partial(buff, len, 0));
148 #define _HAVE_ARCH_IPV6_CSUM
149 static __inline__ __sum16
150 csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr,
151 __u32 len, unsigned short proto, __wsum sum)
153 register unsigned long tmp;
154 __asm__("addl %2@,%0\n\t"
155 "movel %2@(4),%1\n\t"
157 "movel %2@(8),%1\n\t"
159 "movel %2@(12),%1\n\t"
163 "movel %3@(4),%1\n\t"
165 "movel %3@(8),%1\n\t"
167 "movel %3@(12),%1\n\t"
172 : "=&d" (sum), "=&d" (tmp)
173 : "a" (saddr), "a" (daddr), "d" (len + proto),
176 return csum_fold(sum);
179 #endif /* _M68K_CHECKSUM_H */