1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 *	from tahoe:	in_cksum.c	1.2	86/01/05
30 *	from:		@(#)in_cksum.c	1.3 (Berkeley) 1/19/91
31 *	from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp
32 * $FreeBSD$
33 */
34
35#ifndef _MACHINE_IN_CKSUM_H_
36#define	_MACHINE_IN_CKSUM_H_	1
37
38#include <sys/cdefs.h>
39
40#ifdef _KERNEL
41u_short in_cksum(struct mbuf *m, int len);
42u_short in_addword(u_short sum, u_short b);
43u_short in_cksum_skip(struct mbuf *m, int len, int skip);
44u_int do_cksum(const void *, int);
45#if defined(IPVERSION) && (IPVERSION == 4)
46u_int in_cksum_hdr(const struct ip *);
47#endif
48
49static __inline u_short
50in_pseudo(u_int sum, u_int b, u_int c)
51{
52	__asm __volatile("adds %0, %0, %1\n"
53	    		"adcs %0, %0, %2\n"
54			"adc %0, %0, #0\n"
55			: "+r" (sum)
56			: "r" (b), "r" (c));
57	sum = (sum & 0xffff) + (sum >> 16);
58	if (sum > 0xffff)
59		sum -= 0xffff;
60	return (sum);
61}
62
63#endif /* _KERNEL */
64#endif /* _MACHINE_IN_CKSUM_H_ */
65