in_cksum.h revision 154256
186144Stmm/*- 286144Stmm * Copyright (c) 1990 The Regents of the University of California. 386144Stmm * All rights reserved. 486144Stmm * 586144Stmm * Redistribution and use in source and binary forms, with or without 686144Stmm * modification, are permitted provided that the following conditions 786144Stmm * are met: 886144Stmm * 1. Redistributions of source code must retain the above copyright 986144Stmm * notice, this list of conditions and the following disclaimer. 1086144Stmm * 2. Redistributions in binary form must reproduce the above copyright 1186144Stmm * notice, this list of conditions and the following disclaimer in the 1286144Stmm * documentation and/or other materials provided with the distribution. 1386144Stmm * 4. Neither the name of the University nor the names of its contributors 1486144Stmm * may be used to endorse or promote products derived from this software 1586144Stmm * without specific prior written permission. 1686144Stmm * 1786144Stmm * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 1886144Stmm * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1986144Stmm * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2086144Stmm * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2186144Stmm * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2286144Stmm * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2386144Stmm * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2486144Stmm * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2586144Stmm * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2686144Stmm * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2786144Stmm * SUCH DAMAGE. 2886144Stmm */ 2986144Stmm/*- 3086144Stmm * Copyright (c) 2001 by Thomas Moestl <tmm@FreeBSD.org>. 3186144Stmm * All rights reserved. 3286144Stmm * 3386144Stmm * Redistribution and use in source and binary forms, with or without 3486144Stmm * modification, are permitted provided that the following conditions 3586144Stmm * are met: 3686144Stmm * 1. Redistributions of source code must retain the above copyright 3786144Stmm * notice, this list of conditions and the following disclaimer. 3886144Stmm * 2. Redistributions in binary form must reproduce the above copyright 3986144Stmm * notice, this list of conditions and the following disclaimer in the 4086144Stmm * documentation and/or other materials provided with the distribution. 4186144Stmm * 4286144Stmm * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 4386144Stmm * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 4486144Stmm * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 4586144Stmm * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 4686144Stmm * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 4786144Stmm * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 4886144Stmm * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 4986144Stmm * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 5086144Stmm * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE 5186144Stmm * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 5286144Stmm * 5386144Stmm * from tahoe: in_cksum.c 1.2 86/01/05 5486144Stmm * from: @(#)in_cksum.c 1.3 (Berkeley) 1/19/91 5586144Stmm * from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp 5686144Stmm * from: FreeBSD: src/sys/alpha/include/in_cksum.h,v 1.5 2000/05/06 5786144Stmm * 5886144Stmm * $FreeBSD: head/sys/sparc64/include/in_cksum.h 154256 2006-01-12 11:40:39Z marius $ 5986144Stmm */ 6086144Stmm 6186144Stmm#ifndef _MACHINE_IN_CKSUM_H_ 6286144Stmm#define _MACHINE_IN_CKSUM_H_ 1 6386144Stmm 6486144Stmm#include <sys/cdefs.h> 6586144Stmm 6686144Stmm#define in_cksum(m, len) in_cksum_skip(m, len, 0) 6786144Stmm 6886144Stmmstatic __inline void 6986144Stmmin_cksum_update(struct ip *ip) 7086144Stmm{ 7186144Stmm int __tmp; 7286144Stmm 7386144Stmm __tmp = (int)ip->ip_sum + 1; 7486144Stmm ip->ip_sum = __tmp + (__tmp >> 16); 7586144Stmm} 7686144Stmm 7786144Stmmstatic __inline u_short 7886144Stmmin_addword(u_short sum, u_short b) 7986144Stmm{ 8086144Stmm u_long __ret, __tmp; 8186144Stmm 8286144Stmm __asm( 8386144Stmm "sll %2, 16, %0\n" 8486144Stmm "sll %3, 16, %1\n" 8586144Stmm "addcc %0, %1, %0\n" 8686144Stmm "srl %0, 16, %0\n" 8786144Stmm "addc %0, 0, %0\n" 88154256Smarius : "=&r" (__ret), "=&r" (__tmp) : "r" (sum), "r" (b)); 8986144Stmm return (__ret); 9086144Stmm} 9186144Stmm 9286144Stmmstatic __inline u_short 9386144Stmmin_pseudo(u_int sum, u_int b, u_int c) 9486144Stmm{ 9586144Stmm u_long __tmp; 9686144Stmm 9786144Stmm __asm( 9886144Stmm "addcc %0, %3, %0\n" 9986144Stmm "addccc %0, %4, %0\n" 10086144Stmm "addc %0, 0, %0\n" 10186144Stmm "sll %0, 16, %1\n" 10286144Stmm "addcc %0, %1, %0\n" 10386144Stmm "srl %0, 16, %0\n" 10486144Stmm "addc %0, 0, %0\n" 105154256Smarius : "=r" (sum), "=&r" (__tmp) : "0" (sum), "r" (b), "r" (c)); 10686144Stmm return (sum); 10786144Stmm} 10886144Stmm 10986144Stmmstatic __inline u_int 11086144Stmmin_cksum_hdr(struct ip *ip) 11186144Stmm{ 11286144Stmm u_long __ret, __tmp1, __tmp2, __tmp3, __tmp4; 11386144Stmm 11486144Stmm /* 11586144Stmm * Use 32 bit memory accesses and additions - addition with carry only 116154256Smarius * works for 32 bits, and fixing up alignment issues for 64 is probably 11786144Stmm * more trouble than it's worth. 11886144Stmm * This may read outside of the ip header, but does not cross a page 11986144Stmm * boundary in doing so, so that should be OK. 12086144Stmm * Actually, this specialized implementation might be overkill - using 12186144Stmm * a generic implementation for both in_cksum_skip and in_cksum_hdr 12286144Stmm * should not be too much more expensive. 12386144Stmm */ 12486144Stmm#define __LD_ADD(addr, tmp, sum, offs, mod) \ 12586144Stmm "lduw [" #addr " + " #offs "], " #tmp "\n" \ 12686144Stmm "add" # mod " " #sum ", " #tmp ", " #sum "\n" 12786144Stmm 12886144Stmm __asm( 12986144Stmm "and %5, 3, %3\n" 13086144Stmm "andn %5, 3, %1\n" 13186144Stmm "brz,pt %3, 0f\n" 13286144Stmm " lduw [%1], %0\n" 13386144Stmm "mov 4, %4\n" 13486144Stmm "sub %4, %3, %4\n" 13586144Stmm "sll %4, 3, %4\n" /* fix up unaligned buffers */ 13686144Stmm "mov 1, %2\n" 13786144Stmm "sll %2, %4, %4\n" 13886144Stmm "sub %4, 1, %4\n" 13986144Stmm "lduw [%1 + 20], %2\n" 14086144Stmm "andn %2, %4, %2\n" 14186144Stmm "and %0, %4, %0\n" 14286144Stmm "or %0, %2, %0\n" 14386144Stmm "0:\n" 14486144Stmm __LD_ADD(%1, %2, %0, 4, cc) 14586144Stmm __LD_ADD(%1, %2, %0, 8, ccc) 14686144Stmm __LD_ADD(%1, %2, %0, 12, ccc) 14786144Stmm __LD_ADD(%1, %2, %0, 16, ccc) 14886144Stmm "addc %0, 0, %0\n" /* reduce */ 14986144Stmm "1:\n" 15086144Stmm "sll %0, 16, %2\n" 15186144Stmm "addcc %0, %2, %0\n" 15286144Stmm "srl %0, 16, %0\n" 15386144Stmm "addc %0, 0, %0\n" 15486144Stmm "andcc %3, 1, %3\n" /* need to byte-swap? */ 15586144Stmm "clr %3\n" 15686144Stmm "bne,a,pn %%xcc, 1b\n" 15786144Stmm " sll %0, 8, %0\n" 15886144Stmm "not %0\n" 15986144Stmm "sll %0, 16, %0\n" 16086144Stmm "srl %0, 16, %0\n" 161154256Smarius : "=&r" (__ret), "=r" (__tmp1), "=&r" (__tmp2), "=&r" (__tmp3), 162154256Smarius "=&r" (__tmp4) : "1" (ip)); 16386144Stmm#undef __LD_ADD 16486144Stmm return (__ret); 16586144Stmm} 16686144Stmm 16786144Stmmu_short in_cksum_skip(struct mbuf *m, int len, int skip); 16886144Stmm 16986144Stmm#endif /* _MACHINE_IN_CKSUM_H_ */ 170