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NetBSD/sys/arch/i386/stand/lib/biosdisk.c

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/* $NetBSD: biosdisk.c,v 1.15 2001/07/07 22:57:57 perry Exp $ */
/*
* Copyright (c) 1996, 1998
* Matthias Drochner. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project
* by Matthias Drochner.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/*
* raw BIOS disk device for libsa.
* needs lowlevel parts from bios_disk.S and biosdisk_ll.c
* partly from netbsd:sys/arch/i386/boot/disk.c
* no bad144 handling!
*/
/*
* Ported to boot 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
*
* 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.
*/
#include <sys/types.h>
#include <sys/disklabel.h>
#include <lib/libsa/stand.h>
#include <lib/libsa/saerrno.h>
#include <machine/stdarg.h>
#include "libi386.h"
#include "biosdisk_ll.h"
#include "biosdisk.h"
#ifdef _STANDALONE
#include "bootinfo.h"
#endif
#define BUFSIZE (1 * BIOSDISK_SECSIZE)
struct biosdisk {
struct biosdisk_ll ll;
int boff;
char buf[BUFSIZE];
};
#ifdef _STANDALONE
static struct btinfo_bootdisk bi_disk;
#endif
#define RF_PROTECTED_SECTORS 64 /* XXX refer to <.../rf_optnames.h> */
int
biosdiskstrategy(devdata, flag, dblk, size, buf, rsize)
void *devdata;
int flag;
daddr_t dblk;
size_t size;
void *buf;
size_t *rsize;
{
struct biosdisk *d;
int blks, frag;
if (flag != F_READ)
return (EROFS);
d = (struct biosdisk *) devdata;
dblk += d->boff;
blks = size / BIOSDISK_SECSIZE;
if (blks && readsects(&d->ll, dblk, blks, buf, 0)) {
if (rsize)
*rsize = 0;
return (EIO);
}
/* do we really need this? */
frag = size % BIOSDISK_SECSIZE;
if (frag) {
if (readsects(&d->ll, dblk + blks, 1, d->buf, 0)) {
if (rsize)
*rsize = blks * BIOSDISK_SECSIZE;
return (EIO);
}
memcpy(buf + blks * BIOSDISK_SECSIZE, d->buf, frag);
}
if (rsize)
*rsize = size;
return (0);
}
int
biosdiskopen(struct open_file *f, ...)
/* file, biosdev, partition */
{
va_list ap;
struct biosdisk *d;
int partition;
#ifndef NO_DISKLABEL
struct mbr_partition *dptr;
int sector, i;
struct disklabel *lp;
#endif
int error = 0;
d = (struct biosdisk *) alloc(sizeof(struct biosdisk));
if (!d) {
#ifdef DEBUG
printf("biosdiskopen: no memory\n");
#endif
return (ENOMEM);
}
va_start(ap, f);
d->ll.dev = va_arg(ap, int);
if (set_geometry(&d->ll, NULL)) {
#ifdef DISK_DEBUG
printf("no geometry information\n");
#endif
error = ENXIO;
goto out;
}
d->boff = 0;
partition = va_arg(ap, int);
#ifdef _STANDALONE
bi_disk.biosdev = d->ll.dev;
bi_disk.partition = partition;
bi_disk.labelsector = -1;
#endif
#ifndef NO_DISKLABEL
if (!(d->ll.dev & 0x80) /* floppy */
|| partition == RAW_PART)
goto nolabel;
/*
* find NetBSD Partition in DOS partition table
* XXX check magic???
*/
if (readsects(&d->ll, 0, 1, d->buf, 0)) {
#ifdef DISK_DEBUG
printf("error reading MBR\n");
#endif
error = EIO;
goto out;
}
sector = -1;
dptr = (struct mbr_partition *) & d->buf[MBR_PARTOFF];
/* Look for NetBSD partition ID */
for (i = 0; i < NMBRPART; i++, dptr++)
if (dptr->mbrp_typ == MBR_PTYPE_NETBSD) {
sector = dptr->mbrp_start;
break;
}
#ifdef COMPAT_386BSD_MBRPART
if (sector == -1) {
/* If we didn't find one, look for 386BSD partition ID */
dptr = (struct mbr_partition *) & d->buf[MBR_PARTOFF];
for (i = 0; i < NMBRPART; i++, dptr++)
if (dptr->mbrp_typ == MBR_PTYPE_386BSD) {
printf("old BSD partition ID!\n");
sector = dptr->mbrp_start;
break;
}
}
#endif
if (sector == -1) {
/*
* One of two things:
* 1. no MBR
* 2. no NetBSD partition in MBR
*
* We simply default to "start of disk" in this case and
* press on.
*/
sector = 0;
}
/* find partition in NetBSD disklabel */
if (readsects(&d->ll, sector + LABELSECTOR, 1, d->buf, 0)) {
#ifdef DISK_DEBUG
printf("Error reading disklabel\n");
#endif
error = EIO;
goto out;
}
lp = (struct disklabel *) (d->buf + LABELOFFSET);
if (lp->d_magic != DISKMAGIC) {
#ifdef DISK_DEBUG
printf("warning: no disklabel\n");
#endif
d->boff = sector;
} else if (partition >= lp->d_npartitions ||
lp->d_partitions[partition].p_fstype == FS_UNUSED) {
#ifdef DISK_DEBUG
printf("illegal partition\n");
#endif
error = EPART;
goto out;
} else {
d->boff = lp->d_partitions[partition].p_offset;
if (lp->d_partitions[partition].p_fstype == FS_RAID)
d->boff += RF_PROTECTED_SECTORS;
#ifdef _STANDALONE
bi_disk.labelsector = sector + LABELSECTOR;
bi_disk.label.type = lp->d_type;
memcpy(bi_disk.label.packname, lp->d_packname, 16);
bi_disk.label.checksum = lp->d_checksum;
#endif
}
nolabel:
#endif /* NO_DISKLABEL */
#ifdef DISK_DEBUG
printf("partition @%d\n", d->boff);
#endif
#ifdef _STANDALONE
BI_ADD(&bi_disk, BTINFO_BOOTDISK, sizeof(bi_disk));
#endif
f->f_devdata = d;
out:
va_end(ap);
if (error)
free(d, sizeof(struct biosdisk));
return (error);
}
#ifndef LIBSA_NO_FS_CLOSE
int
biosdiskclose(f)
struct open_file *f;
{
struct biosdisk *d = f->f_devdata;
if (!(d->ll.dev & 0x80))/* let the floppy drive go off */
delay(3000000); /* 2s is enough on all PCs I found */
free(d, sizeof(struct biosdisk));
f->f_devdata = NULL;
return (0);
}
#endif
int
biosdiskioctl(f, cmd, arg)
struct open_file *f;
u_long cmd;
void *arg;
{
return EIO;
}
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