67 lines
2.6 KiB
C
67 lines
2.6 KiB
C
/*-
|
|
* Copyright (c) 1990 The Regents of the University of California.
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* from tahoe: in_cksum.c 1.2 86/01/05
|
|
* from: @(#)in_cksum.c 1.3 (Berkeley) 1/19/91
|
|
* from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _MACHINE_IN_CKSUM_H_
|
|
#define _MACHINE_IN_CKSUM_H_ 1
|
|
|
|
#include <sys/cdefs.h>
|
|
|
|
#ifdef _KERNEL
|
|
u_short in_cksum(struct mbuf *m, int len);
|
|
u_short in_addword(u_short sum, u_short b);
|
|
u_short in_cksum_skip(struct mbuf *m, int len, int skip);
|
|
u_int do_cksum(const void *, int);
|
|
u_int in_cksum_hdr(const struct ip *);
|
|
|
|
static __inline u_short
|
|
in_pseudo(u_int sum, u_int b, u_int c)
|
|
{
|
|
__asm __volatile("adds %0, %0, %1\n"
|
|
"adcs %0, %0, %2\n"
|
|
"adc %0, %0, #0\n"
|
|
: "+r" (sum)
|
|
: "r" (b), "r" (c));
|
|
sum = (sum & 0xffff) + (sum >> 16);
|
|
if (sum > 0xffff)
|
|
sum -= 0xffff;
|
|
return (sum);
|
|
}
|
|
|
|
#endif /* _KERNEL */
|
|
#endif /* _MACHINE_IN_CKSUM_H_ */
|