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Make disk.c smart enough to handle disk with "OnTrack Disk manager".

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Make it complain if people try to boot from a partition which extends
past 1024 cylinders.  This is better than a random reset...
This commit is contained in:
Poul-Henning Kamp 1995-05-08 02:02:56 +00:00
parent 883c5f31fa
commit 0f15ab39ec
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=8345
1 changed files with 17 additions and 7 deletions
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24
sys/i386/boot/biosboot/disk.c
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@ -24,7 +24,7 @@
* the rights to redistribute these changes.
*
* from: Mach, Revision 2.2 92/04/04 11:35:49 rpd
* $Id: disk.c,v 1.8 1995/02/16 15:06:09 bde Exp $
* $Id: disk.c,v 1.9 1995/04/14 21:26:50 joerg Exp $
*/
/*
@ -85,7 +85,8 @@ devopen(void)
struct dos_partition *dptr;
struct disklabel *dl;
int dosdev = inode.i_dev;
int i, sector, di;
int i, sector = 0, di;
u_long bend;
di = get_diskinfo(dosdev);
spc = (spt = SPT(di)) * HEADS(di);
@ -101,15 +102,14 @@ devopen(void)
#else EMBEDDED_DISKLABEL
Bread(dosdev, 0);
dptr = (struct dos_partition *)(((char *)0)+DOSPARTOFF);
sector = LABELSECTOR;
slice = WHOLE_DISK_SLICE;
for (i = 0; i < NDOSPART; i++, dptr++)
if (dptr->dp_typ == DOSPTYP_386BSD) {
slice = BASE_SLICE + i;
sector = dptr->dp_start + LABELSECTOR;
sector = dptr->dp_start;
break;
}
Bread(dosdev, sector++);
Bread(dosdev, sector + LABELSECTOR);
dl=((struct disklabel *)0);
disklabel = *dl; /* structure copy (maybe useful later)*/
#endif EMBEDDED_DISKLABEL
@ -128,9 +128,19 @@ devopen(void)
maj = 0; /* must be ESDI/IDE */
}
}
boff = dl->d_partitions[part].p_offset;
#ifdef DO_BAD144
/* This little trick is for OnTrack DiskManager disks */
boff = dl->d_partitions[part].p_offset -
dl->d_partitions[2].p_offset + sector;
/* This is a good idea for all disks */
bsize = dl->d_partitions[part].p_size;
bend = boff + bsize - 1 ;
if (bend / spt > 1024) {
printf("partition is out of reach from the bios\n");
return 1;
}
#ifdef DO_BAD144
do_bad144 = 0;
if (dl->d_flags & D_BADSECT) {
/* this disk uses bad144 */