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1) Enable boot from root partition which end > cyl 1023, it isn't criminal

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2) Produce hard error when Bread attempts to read cyl >1023
Reviewed by: bde
This commit is contained in:
Andrey A. Chernov 1995-06-23 01:42:42 +00:00
parent 11d290bdaf
commit 525cb41eb5
1 changed files with 11 additions and 6 deletions
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17
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 1.12 1995/05/21 03:27:13 phk Exp $
* $Id: disk.c,v 1.13 1995/05/30 07:58:31 rgrimes Exp $
*/
/*
@ -86,7 +86,9 @@ devopen(void)
struct disklabel *dl;
int dosdev = inode.i_dev;
int i, sector = 0, di;
#if 0 /* Save space, already have hard error for cyl > 1023 in Bread */
u_long bend;
#endif
di = get_diskinfo(dosdev);
spc = (spt = SPT(di)) * HEADS(di);
@ -134,12 +136,11 @@ devopen(void)
/* This is a good idea for all disks */
bsize = dl->d_partitions[part].p_size;
#if 0 /* Save space, already have hard error for cyl > 1023 in Bread */
bend = boff + bsize - 1 ;
if (bend / spc > 1024) {
printf("partition is out of reach from the bios\n");
return 1;
}
if (bend / spc >= 1024) {
printf("boot partition end >= cyl 1024, BIOS can't load kernel stored beyond this limit\n");
#endif
#ifdef DO_BAD144
do_bad144 = 0;
if (dl->d_flags & D_BADSECT) {
@ -212,6 +213,10 @@ Bread(int dosdev, int sector)
int cyl, head, sec, nsec;
cyl = sector/spc;
if (cyl > 1023) {
printf("Error: C:%d > 1023 (BIOS limit)\n", cyl);
for(;;); /* loop forever */
}
head = (sector % spc) / spt;
sec = sector % spt;
nsec = spt - sec;