FreeBSD-5.3/sys/sparc64/include/in_cksum.h
/*-
* 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.
* 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.
*/
/*-
* Copyright (c) 2001 by Thomas Moestl <tmm@FreeBSD.org>.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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
* from: FreeBSD: src/sys/alpha/include/in_cksum.h,v 1.5 2000/05/06
*
* $FreeBSD: src/sys/sparc64/include/in_cksum.h,v 1.2 2004/04/07 05:00:00 imp Exp $
*/
#ifndef _MACHINE_IN_CKSUM_H_
#define _MACHINE_IN_CKSUM_H_ 1
#include <sys/cdefs.h>
#define in_cksum(m, len) in_cksum_skip(m, len, 0)
static __inline void
in_cksum_update(struct ip *ip)
{
int __tmp;
__tmp = (int)ip->ip_sum + 1;
ip->ip_sum = __tmp + (__tmp >> 16);
}
static __inline u_short
in_addword(u_short sum, u_short b)
{
u_long __ret, __tmp;
__asm(
"sll %2, 16, %0\n"
"sll %3, 16, %1\n"
"addcc %0, %1, %0\n"
"srl %0, 16, %0\n"
"addc %0, 0, %0\n"
: "=r" (__ret), "=r" (__tmp) : "r" (sum), "r" (b));
return (__ret);
}
static __inline u_short
in_pseudo(u_int sum, u_int b, u_int c)
{
u_long __tmp;
__asm(
"addcc %0, %3, %0\n"
"addccc %0, %4, %0\n"
"addc %0, 0, %0\n"
"sll %0, 16, %1\n"
"addcc %0, %1, %0\n"
"srl %0, 16, %0\n"
"addc %0, 0, %0\n"
: "=r" (sum), "=r" (__tmp) : "0" (sum), "r" (b), "r" (c));
return (sum);
}
static __inline u_int
in_cksum_hdr(struct ip *ip)
{
u_long __ret, __tmp1, __tmp2, __tmp3, __tmp4;
/*
* Use 32 bit memory accesses and additions - addition with carry only
* works for 32 bits, and fixing up alignent issues for 64 is probably
* more trouble than it's worth.
* This may read outside of the ip header, but does not cross a page
* boundary in doing so, so that should be OK.
* Actually, this specialized implementation might be overkill - using
* a generic implementation for both in_cksum_skip and in_cksum_hdr
* should not be too much more expensive.
*/
#define __LD_ADD(addr, tmp, sum, offs, mod) \
"lduw [" #addr " + " #offs "], " #tmp "\n" \
"add" # mod " " #sum ", " #tmp ", " #sum "\n"
__asm(
"and %5, 3, %3\n"
"andn %5, 3, %1\n"
"brz,pt %3, 0f\n"
" lduw [%1], %0\n"
"mov 4, %4\n"
"sub %4, %3, %4\n"
"sll %4, 3, %4\n" /* fix up unaligned buffers */
"mov 1, %2\n"
"sll %2, %4, %4\n"
"sub %4, 1, %4\n"
"lduw [%1 + 20], %2\n"
"andn %2, %4, %2\n"
"and %0, %4, %0\n"
"or %0, %2, %0\n"
"0:\n"
__LD_ADD(%1, %2, %0, 4, cc)
__LD_ADD(%1, %2, %0, 8, ccc)
__LD_ADD(%1, %2, %0, 12, ccc)
__LD_ADD(%1, %2, %0, 16, ccc)
"addc %0, 0, %0\n" /* reduce */
"1:\n"
"sll %0, 16, %2\n"
"addcc %0, %2, %0\n"
"srl %0, 16, %0\n"
"addc %0, 0, %0\n"
"andcc %3, 1, %3\n" /* need to byte-swap? */
"clr %3\n"
"bne,a,pn %%xcc, 1b\n"
" sll %0, 8, %0\n"
"not %0\n"
"sll %0, 16, %0\n"
"srl %0, 16, %0\n"
: "=r" (__ret), "=r" (__tmp1), "=r" (__tmp2), "=r" (__tmp3),
"=r" (__tmp4) : "1" (ip));
#undef __LD_ADD
return (__ret);
}
u_short in_cksum_skip(struct mbuf *m, int len, int skip);
#endif /* _MACHINE_IN_CKSUM_H_ */