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
Version:
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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: @(#)in_cksum.c 1.3 (Berkeley) 1/19/91 33 * from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp 34 * $FreeBSD$ 35 */ 36 37 #ifndef _MACHINE_IN_CKSUM_H_ 38 #define _MACHINE_IN_CKSUM_H_ 1 39 40 #include <sys/cdefs.h> 41 42 #ifdef _KERNEL 43 u_short in_cksum(struct mbuf *m, int len); 44 u_short in_addword(u_short sum, u_short b); 45 u_short in_cksum_skip(struct mbuf *m, int len, int skip); 46 u_int do_cksum(const void *, int); 47 #if defined(IPVERSION) && (IPVERSION == 4) 48 u_int in_cksum_hdr(const struct ip *); 49 #endif 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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