/* $NetBSD: getextmemx.c,v 1.1 1997/08/14 15:22:00 drochner Exp $ */ /* * Copyright (c) 1997 * Matthias Drochner. 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed for the NetBSD Project * by Matthias Drochner. * 4. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * 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 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. * */ /* Try 2 more fancy BIOS calls to get the size of extended memory besides the classical int15/88, take maximum. needs lowlevel parts from biosmemx.S and biosmem.S */ #include #include "libi386.h" extern int getextmem2 __P((int*)); extern int getmementry __P((int, int*)); int getextmemx() { int buf[5], i; int extmem = getextmem1(); if(!getextmem2(buf) && buf[0] <= 15 * 1024) { int help = buf[0]; if(help == 15 * 1024) help += buf[1] * 64; if(extmem < help) extmem = help; } for(i = 0; (i = getmementry(i, buf)) != 0;) { if((buf[4] == 1 && buf[0] == 0x100000) && extmem < buf[2] / 1024) extmem = buf[2] / 1024; } return(extmem); }