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getextmemx.c revision 1.1 
      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