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getextmemx.c revision 1.3 
      1 /*	$NetBSD: getextmemx.c,v 1.3 2003/01/23 21:22:25 jdolecek Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1997, 1999
      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 /*
     36  * Try 2 more fancy BIOS calls to get the size of extended
     37  * memory besides the classical int15/88, take maximum.
     38  * needs lowlevel parts from biosmemx.S and biosmem.S
     39  */
     40 
     41 #include <lib/libsa/stand.h>
     42 #include "libi386.h"
     43 
     44 extern int getextmem2 __P((int *));
     45 extern int getmementry __P((int *, int *));
     46 extern int getextmemps2 __P((void *));
     47 
     48 int
     49 getextmemx()
     50 {
     51 	int buf[5], i;
     52 	int extmem = getextmem1();
     53 #ifdef SUPPORT_PS2
     54 	struct {
     55 		uint16_t len;
     56 		uint32_t dta[8];
     57 		/* pad to 64 bytes - without this, machine would reset */
     58 		uint8_t __pad[30];
     59 	} __attribute__((__packed__)) bufps2;
     60 #endif
     61 
     62 	if (!getextmem2(buf) && buf[0] <= 15 * 1024) {
     63 		int help = buf[0];
     64 		if (help == 15 * 1024)
     65 			help += buf[1] * 64;
     66 		if (extmem < help)
     67 			extmem = help;
     68 	}
     69 
     70 	i = 0;
     71 	do {
     72 		if (getmementry(&i, buf))
     73 			break;
     74 		if ((buf[4] == 1 && buf[0] == 0x100000)
     75 		    && extmem < buf[2] / 1024)
     76 			extmem = buf[2] / 1024;
     77 	} while (i);
     78 
     79 #ifdef SUPPORT_PS2
     80 	/* use local memory information from RETURN MEMORY-MAP INFORMATION */
     81 	if (!getextmemps2((void *) &bufps2)) {
     82 		int help = bufps2.dta[0];
     83 		if (help == 15 * 1024)
     84 			help += bufps2.dta[1];
     85 		if (extmem < help)
     86 			extmem = help;
     87 	}
     88 #endif
     89 
     90 	return (extmem);
     91 }
     92