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 extern __wsum csum_and_copy_from_user(const void __user *src,
39 extern __wsum csum_partial_copy_nocheck(const void *src,
44 * This is a version of ip_fast_csum() optimized for IP headers,
45 * which always checksum on 4 octet boundaries.
47 static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
52 __asm__ ("subqw #1,%2\n"
62 : "=d" (sum), "=&a" (iph), "=&d" (ihl), "=&d" (tmp)
63 : "0" (sum), "1" (iph), "2" (ihl)
65 return (__force __sum16)~sum;
68 static inline __sum16 csum_fold(__wsum sum)
70 unsigned int tmp = (__force u32)sum;
76 : "=&d" (sum), "=&d" (tmp)
77 : "0" (sum), "1" (tmp));
79 return (__force __sum16)~sum;
83 csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
84 unsigned short proto, __wsum sum)
86 __asm__ ("addl %2,%0\n\t"
91 : "=&d" (sum), "=d" (saddr)
92 : "g" (daddr), "1" (saddr), "d" (len + proto),
99 * computes the checksum of the TCP/UDP pseudo-header
100 * returns a 16-bit checksum, already complemented
102 static inline __sum16
103 csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len,
104 unsigned short proto, __wsum sum)
106 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
110 * this routine is used for miscellaneous IP-like checksums, mainly
114 static inline __sum16 ip_compute_csum(const void *buff, int len)
116 return csum_fold (csum_partial(buff, len, 0));
119 #define _HAVE_ARCH_IPV6_CSUM
120 static __inline__ __sum16
121 csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr,
122 __u32 len, __u8 proto, __wsum sum)
124 register unsigned long tmp;
125 __asm__("addl %2@,%0\n\t"
126 "movel %2@(4),%1\n\t"
128 "movel %2@(8),%1\n\t"
130 "movel %2@(12),%1\n\t"
134 "movel %3@(4),%1\n\t"
136 "movel %3@(8),%1\n\t"
138 "movel %3@(12),%1\n\t"
143 : "=&d" (sum), "=&d" (tmp)
144 : "a" (saddr), "a" (daddr), "d" (len + proto),
147 return csum_fold(sum);
150 #endif /* CONFIG_GENERIC_CSUM */
151 #endif /* _M68K_CHECKSUM_H */