stand/lib/getextmemx.c

1.1.2.2  thorpej /*	$NetBSD: getextmemx.c,v 1.1.2.2 1997/08/23 07:09:40 thorpej Exp $	*/
1.1.2.2  thorpej
1.1.2.2  thorpej /*
1.1.2.2  thorpej  * Copyright (c) 1997
1.1.2.2  thorpej  *	Matthias Drochner.  All rights reserved.
1.1.2.2  thorpej  *
1.1.2.2  thorpej  * Redistribution and use in source and binary forms, with or without
1.1.2.2  thorpej  * modification, are permitted provided that the following conditions
1.1.2.2  thorpej  * are met:
1.1.2.2  thorpej  * 1. Redistributions of source code must retain the above copyright
1.1.2.2  thorpej  *    notice, this list of conditions and the following disclaimer.
1.1.2.2  thorpej  * 2. Redistributions in binary form must reproduce the above copyright
1.1.2.2  thorpej  *    notice, this list of conditions and the following disclaimer in the
1.1.2.2  thorpej  *    documentation and/or other materials provided with the distribution.
1.1.2.2  thorpej  * 3. All advertising materials mentioning features or use of this software
1.1.2.2  thorpej  *    must display the following acknowledgement:
1.1.2.2  thorpej  *	This product includes software developed for the NetBSD Project
1.1.2.2  thorpej  *	by Matthias Drochner.
1.1.2.2  thorpej  * 4. The name of the author may not be used to endorse or promote products
1.1.2.2  thorpej  *    derived from this software without specific prior written permission.
1.1.2.2  thorpej  *
1.1.2.2  thorpej  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
1.1.2.2  thorpej  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
1.1.2.2  thorpej  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
1.1.2.2  thorpej  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
1.1.2.2  thorpej  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
1.1.2.2  thorpej  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
1.1.2.2  thorpej  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
1.1.2.2  thorpej  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
1.1.2.2  thorpej  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
1.1.2.2  thorpej  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.1.2.2  thorpej  *
1.1.2.2  thorpej  */
1.1.2.2  thorpej
1.1.2.2  thorpej /* Try 2 more fancy BIOS calls to get the size of extended
1.1.2.2  thorpej  memory besides the classical int15/88, take maximum.
1.1.2.2  thorpej  needs lowlevel parts from biosmemx.S and biosmem.S
1.1.2.2  thorpej  */
1.1.2.2  thorpej
1.1.2.2  thorpej #include <lib/libsa/stand.h>
1.1.2.2  thorpej #include "libi386.h"
1.1.2.2  thorpej
1.1.2.2  thorpej extern int getextmem2 __P((int*));
1.1.2.2  thorpej extern int getmementry __P((int, int*));
1.1.2.2  thorpej
1.1.2.2  thorpej int getextmemx()
1.1.2.2  thorpej {
1.1.2.2  thorpej 	int buf[5], i;
1.1.2.2  thorpej 	int extmem = getextmem1();
1.1.2.2  thorpej
1.1.2.2  thorpej 	if(!getextmem2(buf) && buf[0] <= 15 * 1024) {
1.1.2.2  thorpej 		int help = buf[0];
1.1.2.2  thorpej 		if(help == 15 * 1024)
1.1.2.2  thorpej 			help += buf[1] * 64;
1.1.2.2  thorpej 		if(extmem < help)
1.1.2.2  thorpej 			extmem = help;
1.1.2.2  thorpej 	}
1.1.2.2  thorpej
1.1.2.2  thorpej 	for(i = 0; (i = getmementry(i, buf)) != 0;) {
1.1.2.2  thorpej 		if((buf[4] == 1 && buf[0] == 0x100000)
1.1.2.2  thorpej 		   && extmem < buf[2] / 1024)
1.1.2.2  thorpej 			extmem = buf[2] / 1024;
1.1.2.2  thorpej 	}
1.1.2.2  thorpej
1.1.2.2  thorpej 	return(extmem);
1.1.2.2  thorpej }