2fcbca0d85
license, per letter dated July 22, 1999 and email from Peter Wemm, Alan Cox and Robert Watson. Approved by: core, peter, alc, rwatson
170 lines
5.8 KiB
C
170 lines
5.8 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*-
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* Copyright (c) 2001 by Thomas Moestl <tmm@FreeBSD.org>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* from tahoe: in_cksum.c 1.2 86/01/05
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* from: @(#)in_cksum.c 1.3 (Berkeley) 1/19/91
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* from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp
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* from: FreeBSD: src/sys/alpha/include/in_cksum.h,v 1.5 2000/05/06
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_IN_CKSUM_H_
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#define _MACHINE_IN_CKSUM_H_ 1
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#include <sys/cdefs.h>
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#define in_cksum(m, len) in_cksum_skip(m, len, 0)
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static __inline void
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in_cksum_update(struct ip *ip)
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{
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int __tmp;
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__tmp = (int)ip->ip_sum + 1;
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ip->ip_sum = __tmp + (__tmp >> 16);
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}
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static __inline u_short
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in_addword(u_short sum, u_short b)
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{
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u_long __ret, __tmp;
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__asm(
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"sll %2, 16, %0\n"
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"sll %3, 16, %1\n"
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"addcc %0, %1, %0\n"
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"srl %0, 16, %0\n"
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"addc %0, 0, %0\n"
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: "=r" (__ret), "=r" (__tmp) : "r" (sum), "r" (b));
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return (__ret);
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}
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static __inline u_short
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in_pseudo(u_int sum, u_int b, u_int c)
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{
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u_long __tmp;
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__asm(
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"addcc %0, %3, %0\n"
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"addccc %0, %4, %0\n"
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"addc %0, 0, %0\n"
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"sll %0, 16, %1\n"
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"addcc %0, %1, %0\n"
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"srl %0, 16, %0\n"
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"addc %0, 0, %0\n"
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: "=r" (sum), "=r" (__tmp) : "0" (sum), "r" (b), "r" (c));
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return (sum);
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}
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static __inline u_int
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in_cksum_hdr(struct ip *ip)
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{
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u_long __ret, __tmp1, __tmp2, __tmp3, __tmp4;
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/*
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* Use 32 bit memory accesses and additions - addition with carry only
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* works for 32 bits, and fixing up alignent issues for 64 is probably
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* more trouble than it's worth.
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* This may read outside of the ip header, but does not cross a page
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* boundary in doing so, so that should be OK.
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* Actually, this specialized implementation might be overkill - using
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* a generic implementation for both in_cksum_skip and in_cksum_hdr
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* should not be too much more expensive.
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*/
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#define __LD_ADD(addr, tmp, sum, offs, mod) \
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"lduw [" #addr " + " #offs "], " #tmp "\n" \
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"add" # mod " " #sum ", " #tmp ", " #sum "\n"
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__asm(
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"and %5, 3, %3\n"
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"andn %5, 3, %1\n"
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"brz,pt %3, 0f\n"
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" lduw [%1], %0\n"
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"mov 4, %4\n"
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"sub %4, %3, %4\n"
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"sll %4, 3, %4\n" /* fix up unaligned buffers */
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"mov 1, %2\n"
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"sll %2, %4, %4\n"
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"sub %4, 1, %4\n"
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"lduw [%1 + 20], %2\n"
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"andn %2, %4, %2\n"
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"and %0, %4, %0\n"
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"or %0, %2, %0\n"
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"0:\n"
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__LD_ADD(%1, %2, %0, 4, cc)
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__LD_ADD(%1, %2, %0, 8, ccc)
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__LD_ADD(%1, %2, %0, 12, ccc)
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__LD_ADD(%1, %2, %0, 16, ccc)
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"addc %0, 0, %0\n" /* reduce */
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"1:\n"
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"sll %0, 16, %2\n"
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"addcc %0, %2, %0\n"
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"srl %0, 16, %0\n"
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"addc %0, 0, %0\n"
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"andcc %3, 1, %3\n" /* need to byte-swap? */
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"clr %3\n"
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"bne,a,pn %%xcc, 1b\n"
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" sll %0, 8, %0\n"
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"not %0\n"
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"sll %0, 16, %0\n"
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"srl %0, 16, %0\n"
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: "=r" (__ret), "=r" (__tmp1), "=r" (__tmp2), "=r" (__tmp3),
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"=r" (__tmp4) : "1" (ip));
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#undef __LD_ADD
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return (__ret);
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}
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u_short in_cksum_skip(struct mbuf *m, int len, int skip);
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#endif /* _MACHINE_IN_CKSUM_H_ */
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