1 /* $NetBSD: getextmemx.c,v 1.1 1997/08/14 15:22:00 drochner Exp $ */ 2 3 /* 4 * Copyright (c) 1997 5 * Matthias Drochner. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed for the NetBSD Project 18 * by Matthias Drochner. 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 * 33 */ 34 35 /* Try 2 more fancy BIOS calls to get the size of extended 36 memory besides the classical int15/88, take maximum. 37 needs lowlevel parts from biosmemx.S and biosmem.S 38 */ 39 40 #include <lib/libsa/stand.h> 41 #include "libi386.h" 42 43 extern int getextmem2 __P((int*)); 44 extern int getmementry __P((int, int*)); 45 46 int getextmemx() 47 { 48 int buf[5], i; 49 int extmem = getextmem1(); 50 51 if(!getextmem2(buf) && buf[0] <= 15 * 1024) { 52 int help = buf[0]; 53 if(help == 15 * 1024) 54 help += buf[1] * 64; 55 if(extmem < help) 56 extmem = help; 57 } 58 59 for(i = 0; (i = getmementry(i, buf)) != 0;) { 60 if((buf[4] == 1 && buf[0] == 0x100000) 61 && extmem < buf[2] / 1024) 62 extmem = buf[2] / 1024; 63 } 64 65 return(extmem); 66 } 67