331 lines
7.9 KiB
C
331 lines
7.9 KiB
C
/*
|
|
* Mach Operating System
|
|
* Copyright (c) 1992, 1991 Carnegie Mellon University
|
|
* All Rights Reserved.
|
|
*
|
|
* Permission to use, copy, modify and distribute this software and its
|
|
* documentation is hereby granted, provided that both the copyright
|
|
* notice and this permission notice appear in all copies of the
|
|
* software, derivative works or modified versions, and any portions
|
|
* thereof, and that both notices appear in supporting documentation.
|
|
*
|
|
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
|
|
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
|
|
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
|
|
*
|
|
* Carnegie Mellon requests users of this software to return to
|
|
*
|
|
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
|
|
* School of Computer Science
|
|
* Carnegie Mellon University
|
|
* Pittsburgh PA 15213-3890
|
|
*
|
|
* any improvements or extensions that they make and grant Carnegie Mellon
|
|
* the rights to redistribute these changes.
|
|
*
|
|
* from: Mach, Revision 2.2 92/04/04 11:35:49 rpd
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* Ported to PC-9801 by Yoshio Kimura
|
|
*/
|
|
|
|
/*
|
|
* 93/10/08 bde
|
|
* If there is no 386BSD partition, initialize the label sector with
|
|
* LABELSECTOR instead of with garbage.
|
|
*
|
|
* 93/08/22 bde
|
|
* Fixed reading of bad sector table. It is at the end of the 'c'
|
|
* partition, which is not always at the end of the disk.
|
|
*/
|
|
|
|
#include "boot.h"
|
|
#ifdef DO_BAD144
|
|
#include <sys/dkbad.h>
|
|
#endif DO_BAD144
|
|
#include <sys/disklabel.h>
|
|
#include <sys/diskslice.h>
|
|
|
|
#define BIOS_DEV_FLOPPY 0x0
|
|
#define BIOS_DEV_WIN 0x80
|
|
|
|
#define BPS 512
|
|
#define SPT(di) ((di)&0xff)
|
|
#define HEADS(di) (((di)>>8)&0xff)
|
|
|
|
#ifdef DO_BAD144
|
|
static struct dkbad dkb;
|
|
static int do_bad144;
|
|
static int bsize;
|
|
#endif DO_BAD144
|
|
|
|
static int spt, spc;
|
|
|
|
struct fs *fs;
|
|
struct inode inode;
|
|
int dosdev, unit, slice, part, maj, boff;
|
|
|
|
/*#define EMBEDDED_DISKLABEL 1*/
|
|
|
|
/* Read ahead buffer large enough for one track on a 1440K floppy. For
|
|
* reading from floppies, the bootstrap has to be loaded on a 64K boundary
|
|
* to ensure that this buffer doesn't cross a 64K DMA boundary.
|
|
*/
|
|
#define RA_SECTORS 18
|
|
static char ra_buf[RA_SECTORS * BPS];
|
|
static int ra_dev;
|
|
static int ra_end;
|
|
static int ra_first;
|
|
|
|
static int badsect(int sector);
|
|
static char *Bread(int dosdev, int sector);
|
|
|
|
int
|
|
devopen(void)
|
|
{
|
|
struct dos_partition *dptr;
|
|
struct disklabel *dl;
|
|
char *p;
|
|
int i, sector = 0, di, dosdev_copy;
|
|
|
|
dosdev_copy = dosdev;
|
|
di = get_diskinfo(dosdev_copy);
|
|
spc = (spt = SPT(di)) * HEADS(di);
|
|
|
|
#ifndef RAWBOOT
|
|
if ((dosdev_copy & 0xf0) == 0x90)
|
|
{
|
|
boff = 0;
|
|
part = (spt == 15 ? 0 : 1);
|
|
}
|
|
else
|
|
{
|
|
#ifdef EMBEDDED_DISKLABEL
|
|
dl = &disklabel;
|
|
#else EMBEDDED_DISKLABEL
|
|
#ifdef PC98
|
|
p = Bread(dosdev_copy, 1);
|
|
dptr = (struct dos_partition *)p;
|
|
slice = WHOLE_DISK_SLICE;
|
|
for (i = 0; i < NDOSPART; i++, dptr++)
|
|
if (dptr->dp_mid == DOSPTYP_386BSD) {
|
|
slice = BASE_SLICE + i;
|
|
sector = dptr->dp_scyl * spc;
|
|
break;
|
|
}
|
|
p = Bread(dosdev, sector + LABELSECTOR);
|
|
dl=((struct disklabel *)p);
|
|
disklabel = *dl; /* structure copy (maybe useful later)*/
|
|
#else
|
|
p = Bread(dosdev_copy, 0);
|
|
dptr = (struct dos_partition *)(p+DOSPARTOFF);
|
|
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;
|
|
break;
|
|
}
|
|
p = Bread(dosdev_copy, sector + LABELSECTOR);
|
|
dl=((struct disklabel *)p);
|
|
disklabel = *dl; /* structure copy (maybe useful later)*/
|
|
#endif /* PC98 */
|
|
#endif EMBEDDED_DISKLABEL
|
|
if (dl->d_magic != DISKMAGIC) {
|
|
printf("bad disklabel\n");
|
|
return 1;
|
|
}
|
|
if( (maj == 4) || (maj == 0) || (maj == 1))
|
|
{
|
|
if (dl->d_type == DTYPE_SCSI)
|
|
{
|
|
maj = 4; /* use scsi as boot dev */
|
|
}
|
|
else
|
|
{
|
|
maj = 0; /* must be ESDI/IDE */
|
|
}
|
|
}
|
|
/* This little trick is for OnTrack DiskManager disks */
|
|
boff = dl->d_partitions[part].p_offset -
|
|
dl->d_partitions[2].p_offset + sector;
|
|
|
|
#ifndef PC98
|
|
bsize = dl->d_partitions[part].p_size;
|
|
if (bsize == 0) {
|
|
printf("empty partition\n");
|
|
return 1;
|
|
}
|
|
|
|
#endif
|
|
|
|
#ifdef DO_BAD144
|
|
do_bad144 = 0;
|
|
if (dl->d_flags & D_BADSECT) {
|
|
/* this disk uses bad144 */
|
|
int i;
|
|
int dkbbnum;
|
|
struct dkbad *dkbptr;
|
|
|
|
/* find the first readable bad sector table */
|
|
/* some of this code is copied from ufs/ufs_disksubr.c */
|
|
/* including the bugs :-( */
|
|
/* read a bad sector table */
|
|
|
|
#define BAD144_PART 2 /* XXX scattered magic numbers */
|
|
#define BSD_PART 0 /* XXX should be 2 but bad144.c uses 0 */
|
|
if (dl->d_partitions[BSD_PART].p_offset != 0)
|
|
dkbbnum = dl->d_partitions[BAD144_PART].p_offset
|
|
+ dl->d_partitions[BAD144_PART].p_size;
|
|
else
|
|
dkbbnum = dl->d_secperunit;
|
|
dkbbnum -= dl->d_nsectors;
|
|
|
|
if (dl->d_secsize > DEV_BSIZE)
|
|
dkbbnum *= dl->d_secsize / DEV_BSIZE;
|
|
else
|
|
dkbbnum /= DEV_BSIZE / dl->d_secsize;
|
|
i = 0;
|
|
do_bad144 = 0;
|
|
do {
|
|
/* XXX: what if the "DOS sector" < 512 bytes ??? */
|
|
p = Bread(dosdev_copy, dkbbnum + i);
|
|
dkbptr = (struct dkbad *) p;
|
|
/* XXX why is this not in <sys/dkbad.h> ??? */
|
|
#define DKBAD_MAGIC 0x4321
|
|
if (dkbptr->bt_mbz == 0 &&
|
|
dkbptr->bt_flag == DKBAD_MAGIC) {
|
|
dkb = *dkbptr; /* structure copy */
|
|
do_bad144 = 1;
|
|
break;
|
|
}
|
|
i += 2;
|
|
} while (i < 10 && (unsigned)i < dl->d_nsectors);
|
|
if (!do_bad144)
|
|
printf("Bad bad sector table\n");
|
|
else
|
|
printf("Using bad sector table at %d\n", dkbbnum+i);
|
|
}
|
|
#endif /* DO_BAD144 */
|
|
}
|
|
#endif /* RAWBOOT */
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Be aware that cnt is rounded up to N*BPS
|
|
*/
|
|
void
|
|
devread(char *iodest, int sector, int cnt)
|
|
{
|
|
int offset;
|
|
char *p;
|
|
int dosdev_copy;
|
|
|
|
for (offset = 0; offset < cnt; offset += BPS)
|
|
{
|
|
dosdev_copy = dosdev;
|
|
p = Bread(dosdev_copy, badsect(sector++));
|
|
bcopy(p, iodest+offset, BPS);
|
|
}
|
|
}
|
|
|
|
|
|
static char *
|
|
Bread(int dosdev, int sector)
|
|
{
|
|
if (dosdev != ra_dev || sector < ra_first || sector >= ra_end)
|
|
{
|
|
int cyl, head, sec, nsec;
|
|
|
|
cyl = sector/spc;
|
|
#ifndef PC98
|
|
if (cyl > 1023) {
|
|
printf("Error: C:%d > 1023 (BIOS limit)\n", cyl);
|
|
for(;;); /* loop forever */
|
|
}
|
|
#endif
|
|
head = (sector % spc) / spt;
|
|
sec = sector % spt;
|
|
nsec = spt - sec;
|
|
if (nsec > RA_SECTORS)
|
|
nsec = RA_SECTORS;
|
|
twiddle();
|
|
if (biosread(dosdev, cyl, head, sec, nsec, ra_buf) != 0)
|
|
{
|
|
nsec = 1;
|
|
twiddle();
|
|
while (biosread(dosdev, cyl, head, sec, nsec, ra_buf) != 0) {
|
|
printf("Error: D:0x%x C:%d H:%d S:%d\n",
|
|
dosdev, cyl, head, sec);
|
|
twiddle();
|
|
}
|
|
}
|
|
ra_dev = dosdev;
|
|
ra_first = sector;
|
|
ra_end = sector + nsec;
|
|
}
|
|
return (ra_buf + (sector - ra_first) * BPS);
|
|
}
|
|
|
|
static int
|
|
badsect(int sector)
|
|
{
|
|
#if defined(DO_BAD144) && !defined(RAWBOOT)
|
|
int i;
|
|
if (do_bad144) {
|
|
u_short cyl;
|
|
u_short head;
|
|
u_short sec;
|
|
int newsec;
|
|
struct disklabel *dl = &disklabel;
|
|
|
|
/* XXX */
|
|
/* from wd.c */
|
|
/* bt_cyl = cylinder number in sorted order */
|
|
/* bt_trksec is actually (head << 8) + sec */
|
|
|
|
/* only remap sectors in the partition */
|
|
if (sector < boff || sector >= boff + bsize) {
|
|
goto no_remap;
|
|
}
|
|
|
|
cyl = (sector-boff) / dl->d_secpercyl;
|
|
head = ((sector-boff) % dl->d_secpercyl) / dl->d_nsectors;
|
|
sec = (sector-boff) % dl->d_nsectors;
|
|
sec = (head<<8) + sec;
|
|
|
|
/* now, look in the table for a possible bad sector */
|
|
for (i=0; i<126; i++) {
|
|
if (dkb.bt_bad[i].bt_cyl == cyl) {
|
|
/* found same cylinder */
|
|
if (dkb.bt_bad[i].bt_trksec == sec) {
|
|
/* FOUND! */
|
|
break;
|
|
}
|
|
} else if (dkb.bt_bad[i].bt_cyl > cyl) {
|
|
i = 126;
|
|
break;
|
|
}
|
|
}
|
|
if (i == 126) {
|
|
/* didn't find bad sector */
|
|
goto no_remap;
|
|
}
|
|
/* otherwise find replacement sector */
|
|
if (dl->d_partitions[BSD_PART].p_offset != 0)
|
|
newsec = dl->d_partitions[BAD144_PART].p_offset
|
|
+ dl->d_partitions[BAD144_PART].p_size;
|
|
else
|
|
newsec = dl->d_secperunit;
|
|
newsec -= dl->d_nsectors + i + 1;
|
|
return newsec;
|
|
}
|
|
no_remap:
|
|
#endif
|
|
return sector;
|
|
}
|