/*- * Copyright (c) 2012 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Matt Thomas of 3am Software Foundry. * * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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. */ #include <machine/asm.h> RCSID("$NetBSD: cpu_in_cksum_v4hdr.S,v 1.4 2012/12/20 07:16:01 matt Exp $") ENTRY(cpu_in_cksum_v4hdr) #ifdef _ARM_ARCH_DWORD_OK tst r0, #4 /* 64-bit aligned? */ ldreqd r2, [r0], #8 /* load 1st/2nd words */ ldrne ip, [r0], #4 /* load 1st word */ ldreq ip, [r0, #8] /* load 5th word */ ldrned r2, [r0, #8] /* load 4th/5th words */ #else ldr ip, [r0] /* load 1st word */ ldr r3, [r0, #4] /* load 2nd word */ ldr r2, [r0, #8] /* load 3rd word */ #endif adds ip, ip, r3 /* accumulate */ adcs ip, ip, r2 /* accumulate */ #ifdef _ARM_ARCH_DWORD_OK ldrd r0, [r0] /* load remaining words */ #else ldr r1, [r0, #12] /* load 4th word */ ldr r0, [r0, #16] /* load 5th word */ #endif adcs ip, ip, r1 /* accumulate */ adcs ip, ip, r0 /* accumulate */ /* * We now have the 33-bit result in <carry>, ip. Pull in the * standard folding code. */ #include "cpu_in_cksum_fold.S" END(cpu_in_cksum_v4hdr) |