2092d92ef2
It will be used for getextmem() if EXTENDED_MEMDETECT is defined. Worked on all tested machines. Thanks to all testers, especially Martin Husemann!
67 lines
2.4 KiB
C
67 lines
2.4 KiB
C
/* $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 <lib/libsa/stand.h>
|
|
#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);
|
|
}
|