2 * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
3 * Copyright (C) 2004 Microtronix Datacom Ltd.
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
10 #ifndef _ASM_NIOS_CHECKSUM_H
11 #define _ASM_NIOS_CHECKSUM_H
13 /* Take these from lib/checksum.c */
14 extern __wsum csum_partial(const void *buff, int len, __wsum sum);
15 extern __wsum csum_partial_copy(const void *src, void *dst, int len,
17 extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
18 int len, __wsum sum, int *csum_err);
19 #define csum_partial_copy_nocheck(src, dst, len, sum) \
20 csum_partial_copy((src), (dst), (len), (sum))
22 extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
23 extern __sum16 ip_compute_csum(const void *buff, int len);
26 * Fold a partial checksum
28 static inline __sum16 csum_fold(__wsum sum)
37 : "r" (sum << 16), "0" (sum)
39 return (__force __sum16) sum;
43 * computes the checksum of the TCP/UDP pseudo-header
44 * returns a 16-bit checksum, already complemented
46 #define csum_tcpudp_nofold csum_tcpudp_nofold
47 static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
48 __u32 len, __u8 proto,
54 "add %0, %0, r8\n" /* add carry */
57 "add %0, %0, r8\n" /* add carry */
60 "add %0, %0, r8\n" /* add carry */
61 : "=r" (sum), "=r" (saddr)
62 : "r" (daddr), "r" ((len + proto) << 8),
70 static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
71 __u32 len, __u8 proto,
74 return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
77 #endif /* _ASM_NIOS_CHECKSUM_H */