FRV: Use generic show_interrupts()
[cris-mirror.git] / include / asm-generic / checksum.h
blob4647c762d970601b9e36f1bdd9e263de49d29071
1 #ifndef __ASM_GENERIC_CHECKSUM_H
2 #define __ASM_GENERIC_CHECKSUM_H
4 /*
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
9 * or csum_tcpudp_magic
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 extern __wsum csum_partial(const void *buff, int len, __wsum sum);
19 * the same as csum_partial, but copies from src while it
20 * checksums
22 * here even more important to align src and dst on a 32-bit (or even
23 * better 64-bit) boundary
25 extern __wsum csum_partial_copy(const void *src, void *dst, int len, __wsum sum);
28 * the same as csum_partial_copy, but copies from user space.
30 * here even more important to align src and dst on a 32-bit (or even
31 * better 64-bit) boundary
33 extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
34 int len, __wsum sum, int *csum_err);
36 #define csum_partial_copy_nocheck(src, dst, len, sum) \
37 csum_partial_copy((src), (dst), (len), (sum))
40 * This is a version of ip_compute_csum() optimized for IP headers,
41 * which always checksum on 4 octet boundaries.
43 extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
46 * Fold a partial checksum
48 static inline __sum16 csum_fold(__wsum csum)
50 u32 sum = (__force u32)csum;
51 sum = (sum & 0xffff) + (sum >> 16);
52 sum = (sum & 0xffff) + (sum >> 16);
53 return (__force __sum16)~sum;
56 #ifndef csum_tcpudp_nofold
58 * computes the checksum of the TCP/UDP pseudo-header
59 * returns a 16-bit checksum, already complemented
61 extern __wsum
62 csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
63 unsigned short proto, __wsum sum);
64 #endif
66 static inline __sum16
67 csum_tcpudp_magic(__be32 saddr, __be32 daddr, unsigned short len,
68 unsigned short proto, __wsum sum)
70 return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
74 * this routine is used for miscellaneous IP-like checksums, mainly
75 * in icmp.c
77 extern __sum16 ip_compute_csum(const void *buff, int len);
79 #endif /* __ASM_GENERIC_CHECKSUM_H */