fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / include / asm-m68knommu / checksum.h
blob81883482ffb1378291a1c8d979098bf7f2083896
1 #ifndef _M68K_CHECKSUM_H
2 #define _M68K_CHECKSUM_H
4 #include <linux/in6.h>
6 /*
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
22 * checksums
24 * here even more important to align src and dst on a 32-bit (or even
25 * better 64-bit) boundary
28 __wsum csum_partial_copy_nocheck(const void *src, void *dst,
29 int len, __wsum sum);
33 * the same as csum_partial_copy, but copies from user space.
35 * here even more important to align src and dst on a 32-bit (or even
36 * better 64-bit) boundary
39 extern __wsum csum_partial_copy_from_user(const void __user *src,
40 void *dst, int len, __wsum sum, int *csum_err);
42 __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
45 * Fold a partial checksum
48 static inline __sum16 csum_fold(__wsum sum)
50 unsigned int tmp = (__force u32)sum;
51 #ifdef CONFIG_COLDFIRE
52 tmp = (tmp & 0xffff) + (tmp >> 16);
53 tmp = (tmp & 0xffff) + (tmp >> 16);
54 return (__force __sum16)~tmp;
55 #else
56 __asm__("swap %1\n\t"
57 "addw %1, %0\n\t"
58 "clrw %1\n\t"
59 "addxw %1, %0"
60 : "=&d" (sum), "=&d" (tmp)
61 : "0" (sum), "1" (sum));
62 return (__force __sum16)~sum;
63 #endif
68 * computes the checksum of the TCP/UDP pseudo-header
69 * returns a 16-bit checksum, already complemented
72 static inline __wsum
73 csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
74 unsigned short proto, __wsum sum)
76 __asm__ ("addl %1,%0\n\t"
77 "addxl %4,%0\n\t"
78 "addxl %5,%0\n\t"
79 "clrl %1\n\t"
80 "addxl %1,%0"
81 : "=&d" (sum), "=&d" (saddr)
82 : "0" (daddr), "1" (saddr), "d" (len + proto),
83 "d"(sum));
84 return sum;
87 static inline __sum16
88 csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len,
89 unsigned short proto, __wsum sum)
91 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
95 * this routine is used for miscellaneous IP-like checksums, mainly
96 * in icmp.c
99 extern __sum16 ip_compute_csum(const void *buff, int len);
101 #define _HAVE_ARCH_IPV6_CSUM
102 static __inline__ __sum16
103 csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr,
104 __u32 len, unsigned short proto, __wsum sum)
106 register unsigned long tmp;
107 __asm__("addl %2@,%0\n\t"
108 "movel %2@(4),%1\n\t"
109 "addxl %1,%0\n\t"
110 "movel %2@(8),%1\n\t"
111 "addxl %1,%0\n\t"
112 "movel %2@(12),%1\n\t"
113 "addxl %1,%0\n\t"
114 "movel %3@,%1\n\t"
115 "addxl %1,%0\n\t"
116 "movel %3@(4),%1\n\t"
117 "addxl %1,%0\n\t"
118 "movel %3@(8),%1\n\t"
119 "addxl %1,%0\n\t"
120 "movel %3@(12),%1\n\t"
121 "addxl %1,%0\n\t"
122 "addxl %4,%0\n\t"
123 "clrl %1\n\t"
124 "addxl %1,%0"
125 : "=&d" (sum), "=&d" (tmp)
126 : "a" (saddr), "a" (daddr), "d" (len + proto),
127 "0" (sum));
129 return csum_fold(sum);
132 #endif /* _M68K_CHECKSUM_H */