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