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bootinfo_biosgeom.c revision 1.1 
      1 /*	$NetBSD: bootinfo_biosgeom.c,v 1.1 1997/09/17 18:30:51 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 #include <sys/types.h>
     36 #include <machine/disklabel.h>
     37 
     38 #include <lib/libkern/libkern.h>
     39 #include <lib/libsa/stand.h>
     40 
     41 #include "libi386.h"
     42 #include "biosdisk_ll.h"
     43 #include "bootinfo.h"
     44 
     45 void bi_getbiosgeom()
     46 {
     47 	unsigned char nhd;
     48 	struct btinfo_biosgeom *bibg;
     49 	int i;
     50 
     51 	pvbcopy(0x400 + 0x75, &nhd, 1); /* from BIOS data area */
     52 	if(nhd == 0 || nhd > 4 /* ??? */ )
     53 		return;
     54 
     55 	bibg = alloc(sizeof(struct btinfo_biosgeom)
     56 		     + (nhd - 1) * sizeof(struct bi_biosgeom_entry));
     57 	if(!bibg) return;
     58 
     59 	bibg->num = nhd;
     60 
     61 	for(i = 0; i < nhd; i++) {
     62 		struct biosdisk_ll d;
     63 		char buf[BIOSDISK_SECSIZE];
     64 
     65 		d.dev = 0x80 + i;
     66 		set_geometry(&d);
     67 		bibg->disk[i].spc = d.spc;
     68 		bibg->disk[i].spt = d.spt;
     69 
     70 		bzero(bibg->disk[i].dosparts,
     71 		      sizeof(bibg->disk[i].dosparts));
     72 		if(readsects(&d, 0, 1, buf, 0))
     73 			continue;
     74 		bcopy(&buf[DOSPARTOFF], bibg->disk[i].dosparts,
     75 		      sizeof(bibg->disk[i].dosparts));
     76 	}
     77 
     78 	BI_ADD(bibg, BTINFO_BIOSGEOM, sizeof(struct btinfo_biosgeom)
     79 	       + (nhd - 1) * sizeof(struct bi_biosgeom_entry));
     80 }
     81