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bootinfo_biosgeom.c revision 1.8 
      1 /*	$NetBSD: bootinfo_biosgeom.c,v 1.8 1999/03/30 17:58:05 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 #include <machine/cpu.h>
     38 
     39 #include <lib/libkern/libkern.h>
     40 #include <lib/libsa/stand.h>
     41 
     42 #include "libi386.h"
     43 #include "biosdisk_ll.h"
     44 #include "bootinfo.h"
     45 
     46 void bi_getbiosgeom()
     47 {
     48 	struct btinfo_biosgeom *bibg;
     49 	int i, j, nvalid;
     50 	unsigned char nhd;
     51 	unsigned int cksum;
     52 
     53 	pvbcopy((void *)(0x400 + 0x75), &nhd, 1);
     54 #ifdef GEOM_DEBUG
     55 	printf("nhd %d\n", (int)nhd);
     56 #endif
     57 
     58 	bibg = alloc(sizeof(struct btinfo_biosgeom)
     59 		     + (nhd - 1) * sizeof(struct bi_biosgeom_entry));
     60 	if (!bibg)
     61 		return;
     62 
     63 	for (i = nvalid = 0; i < MAX_BIOSDISKS && nvalid < (int)nhd; i++) {
     64 		struct biosdisk_ll d;
     65 		struct biosdisk_ext13info ed;
     66 		char buf[BIOSDISK_SECSIZE];
     67 
     68 		d.dev = 0x80 + i;
     69 
     70 		if (set_geometry(&d, &ed))
     71 			continue;
     72 		bzero(&bibg->disk[nvalid], sizeof(bibg->disk[nvalid]));
     73 
     74 		bibg->disk[nvalid].sec = d.sec;
     75 		bibg->disk[nvalid].head = d.head;
     76 		bibg->disk[nvalid].cyl = d.cyl;
     77 		bibg->disk[nvalid].dev = d.dev;
     78 
     79 		if (readsects(&d, 0, 1, buf, 0)) {
     80 			bibg->disk[nvalid].flags |= BI_GEOM_INVALID;
     81 			nvalid++;
     82 			continue;
     83 		}
     84 
     85 #ifdef GEOM_DEBUG
     86 		printf("#%d: %x: C %d H %d S %d\n", nvalid,
     87 		    d.dev, d.cyl, d.head, d.sec);
     88 #endif
     89 
     90 		if (d.flags & BIOSDISK_EXT13) {
     91 			if (ed.flags & EXT13_GEOM_VALID)
     92 				bibg->disk[nvalid].totsec = ed.totsec;
     93 			else
     94 				bibg->disk[nvalid].totsec = 0;
     95 			bibg->disk[nvalid].flags |= BI_GEOM_EXTINT13;
     96 		}
     97 		for (j = 0, cksum = 0; j < BIOSDISK_SECSIZE; j++)
     98 			cksum += buf[j];
     99 		bibg->disk[nvalid].cksum = cksum;
    100 		bcopy(&buf[MBR_PARTOFF], bibg->disk[nvalid].dosparts,
    101 		      sizeof(bibg->disk[nvalid].dosparts));
    102 		nvalid++;
    103 	}
    104 
    105 	bibg->num = nvalid;
    106 
    107 	BI_ADD(bibg, BTINFO_BIOSGEOM, sizeof(struct btinfo_biosgeom)
    108 	       + nvalid * sizeof(struct bi_biosgeom_entry));
    109 }
    110