[BRIDGE] netlink: Convert bridge netlink code to new netlink interface
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / include / asm-v850 / checksum.h
blobd1dddd938262dbd3e70cb5d941600d7994018b8f
1 /*
2 * include/asm-v850/checksum.h -- Checksum ops
4 * Copyright (C) 2001,2005 NEC Corporation
5 * Copyright (C) 2001,2005 Miles Bader <miles@gnu.org>
7 * This file is subject to the terms and conditions of the GNU General
8 * Public License. See the file COPYING in the main directory of this
9 * archive for more details.
11 * Written by Miles Bader <miles@gnu.org>
14 #ifndef __V850_CHECKSUM_H__
15 #define __V850_CHECKSUM_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 extern __wsum csum_partial(const void *buff, int len, __wsum sum);
32 * the same as csum_partial, but copies from src while it
33 * checksums
35 * here even more important to align src and dst on a 32-bit (or even
36 * better 64-bit) boundary
38 extern __wsum csum_partial_copy_nocheck(const void *src,
39 void *dst, int len, __wsum sum);
43 * the same as csum_partial_copy, but copies from user space.
45 * here even more important to align src and dst on a 32-bit (or even
46 * better 64-bit) boundary
48 extern __wsum csum_partial_copy_from_user (const void *src,
49 void *dst,
50 int len, __wsum sum,
51 int *csum_err);
53 __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
56 * Fold a partial checksum
58 static inline __sum16 csum_fold (__wsum sum)
60 unsigned int result;
62 %0 %1
63 hsw %1, %0 H L L H
64 add %1, %0 H L H+L+C H+L
66 asm ("hsw %1, %0; add %1, %0" : "=&r" (result) : "r" (sum));
67 return (__force __sum16)(~result >> 16);
72 * computes the checksum of the TCP/UDP pseudo-header
73 * returns a 16-bit checksum, already complemented
75 static inline __wsum
76 csum_tcpudp_nofold (__be32 saddr, __be32 daddr,
77 unsigned short len,
78 unsigned short proto, __wsum sum)
80 int __carry;
81 __asm__ ("add %2, %0;"
82 "setf c, %1;"
83 "add %1, %0;"
84 "add %3, %0;"
85 "setf c, %1;"
86 "add %1, %0;"
87 "add %4, %0;"
88 "setf c, %1;"
89 "add %1, %0"
90 : "=&r" (sum), "=&r" (__carry)
91 : "r" (daddr), "r" (saddr),
92 "r" ((len + proto) << 8),
93 "0" (sum));
94 return sum;
97 static inline __sum16
98 csum_tcpudp_magic (__be32 saddr, __be32 daddr,
99 unsigned short len,
100 unsigned short proto, __wsum sum)
102 return csum_fold (csum_tcpudp_nofold (saddr, daddr, len, proto, sum));
106 * this routine is used for miscellaneous IP-like checksums, mainly
107 * in icmp.c
109 extern __sum16 ip_compute_csum(const void *buff, int len);
112 #endif /* __V850_CHECKSUM_H__ */