The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arm/include/in_cksum.h

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    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. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      from tahoe:     in_cksum.c      1.2     86/01/05
   34  *      from:           @(#)in_cksum.c  1.3 (Berkeley) 1/19/91
   35  *      from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp
   36  * $FreeBSD: releng/9.0/sys/arm/include/in_cksum.h 156520 2006-03-09 23:33:59Z cognet $
   37  */
   38 
   39 #ifndef _MACHINE_IN_CKSUM_H_
   40 #define _MACHINE_IN_CKSUM_H_    1
   41 
   42 #include <sys/cdefs.h>
   43 
   44 #ifdef _KERNEL
   45 u_short in_cksum(struct mbuf *m, int len);
   46 u_short in_addword(u_short sum, u_short b);
   47 u_short in_cksum_skip(struct mbuf *m, int len, int skip);
   48 u_int do_cksum(const void *, int);
   49 u_int in_cksum_hdr(const struct ip *);
   50 
   51 static __inline u_short
   52 in_pseudo(u_int sum, u_int b, u_int c)
   53 {
   54         __asm __volatile("adds %0, %0, %1\n"
   55                         "adcs %0, %0, %2\n"
   56                         "adc %0, %0, #0\n"
   57                         : "+r" (sum) 
   58                         : "r" (b), "r" (c));
   59         sum = (sum & 0xffff) + (sum >> 16);
   60         if (sum > 0xffff)
   61                 sum -= 0xffff;
   62         return (sum);
   63 }
   64 
   65 #endif /* _KERNEL */
   66 #endif /* _MACHINE_IN_CKSUM_H_ */

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