fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / include / asm-sh64 / checksum.h
blobba594ccb42e5230defa58d3bd534ada0e31443df
1 #ifndef __ASM_SH64_CHECKSUM_H
2 #define __ASM_SH64_CHECKSUM_H
4 /*
5 * This file is subject to the terms and conditions of the GNU General Public
6 * License. See the file "COPYING" in the main directory of this archive
7 * for more details.
9 * include/asm-sh64/checksum.h
11 * Copyright (C) 2000, 2001 Paolo Alberelli
15 #include <asm/registers.h>
18 * computes the checksum of a memory block at buff, length len,
19 * and adds in "sum" (32-bit)
21 * returns a 32-bit number suitable for feeding into itself
22 * or csum_tcpudp_magic
24 * this function must be called with even lengths, except
25 * for the last fragment, which may be odd
27 * it's best to have buff aligned on a 32-bit boundary
29 asmlinkage __wsum csum_partial(const void *buff, int len, __wsum sum);
32 * Note: when you get a NULL pointer exception here this means someone
33 * passed in an incorrect kernel address to one of these functions.
35 * If you use these functions directly please don't forget the
36 * access_ok().
40 __wsum csum_partial_copy_nocheck(const void *src, void *dst, int len,
41 __wsum sum);
43 __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
44 int len, __wsum sum, int *err_ptr);
46 static inline __sum16 csum_fold(__wsum csum)
48 u32 sum = (__force u32)csum;
49 sum = (sum & 0xffff) + (sum >> 16);
50 sum = (sum & 0xffff) + (sum >> 16);
51 return (__force __sum16)~sum;
54 __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
56 __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
57 unsigned short len, unsigned short proto,
58 __wsum sum);
61 * computes the checksum of the TCP/UDP pseudo-header
62 * returns a 16-bit checksum, already complemented
64 static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
65 unsigned short len,
66 unsigned short proto,
67 __wsum sum)
69 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
73 * this routine is used for miscellaneous IP-like checksums, mainly
74 * in icmp.c
76 static inline __sum16 ip_compute_csum(const void *buff, int len)
78 return csum_fold(csum_partial(buff, len, 0));
81 #endif /* __ASM_SH64_CHECKSUM_H */