67 lines
2.4 KiB
C
67 lines
2.4 KiB
C
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/* $NetBSD: getextmemx.c,v 1.1 1997/08/14 15:22:00 drochner Exp $ */
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/*
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* Copyright (c) 1997
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* Matthias Drochner. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project
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* by Matthias Drochner.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/* Try 2 more fancy BIOS calls to get the size of extended
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memory besides the classical int15/88, take maximum.
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needs lowlevel parts from biosmemx.S and biosmem.S
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*/
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#include <lib/libsa/stand.h>
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#include "libi386.h"
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extern int getextmem2 __P((int*));
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extern int getmementry __P((int, int*));
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int getextmemx()
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{
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int buf[5], i;
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int extmem = getextmem1();
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if(!getextmem2(buf) && buf[0] <= 15 * 1024) {
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int help = buf[0];
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if(help == 15 * 1024)
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help += buf[1] * 64;
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if(extmem < help)
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extmem = help;
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}
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for(i = 0; (i = getmementry(i, buf)) != 0;) {
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if((buf[4] == 1 && buf[0] == 0x100000)
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&& extmem < buf[2] / 1024)
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extmem = buf[2] / 1024;
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}
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return(extmem);
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}
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