263 lines
6.7 KiB
C
263 lines
6.7 KiB
C
/* $NetBSD: biosdisk.c,v 1.4 1997/06/13 13:36:04 drochner Exp $ */
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/*
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* Copyright (c) 1996
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* Matthias Drochner. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project
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* by Matthias Drochner.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/*
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* raw BIOS disk device for libsa.
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* needs lowlevel parts from bios_disk.S and biosdisk_ll.c
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* partly from netbsd:sys/arch/i386/boot/disk.c
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* no bad144 handling!
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*/
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/*
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* Ported to boot 386BSD by Julian Elischer (julian@tfs.com) Sept 1992
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*
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* Mach Operating System
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* Copyright (c) 1992, 1991 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie Mellon
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* the rights to redistribute these changes.
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*/
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#include <sys/types.h>
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#include <sys/disklabel.h>
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#include <lib/libsa/stand.h>
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#include <lib/libsa/saerrno.h>
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#include "libi386.h"
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#include "biosdisk_ll.h"
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/* XXX don't include biosdisk.h for now - vararg prototype */
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#define BUFSIZE (1 * BIOSDISK_SECSIZE)
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struct biosdisk {
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struct biosdisk_ll ll;
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#ifdef COMPAT_OLDBOOT
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int disktype;
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#endif
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int boff;
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char buf[BUFSIZE];
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};
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int
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biosdiskstrategy(devdata, flag, dblk, size, buf, rsize)
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void *devdata;
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int flag;
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daddr_t dblk;
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size_t size;
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void *buf;
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size_t *rsize;
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{
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struct biosdisk *d;
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int blks, frag;
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if (flag != F_READ)
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return (EROFS);
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d = (struct biosdisk *) devdata;
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dblk += d->boff;
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blks = size / BIOSDISK_SECSIZE;
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if (blks && readsects(&d->ll, dblk, blks, buf, 0)) {
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if (rsize)
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*rsize = 0;
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return (EIO);
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}
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/* do we really need this? */
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frag = size % BIOSDISK_SECSIZE;
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if (frag) {
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if (readsects(&d->ll, dblk + blks, 1, d->buf, 0)) {
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if (rsize)
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*rsize = blks * BIOSDISK_SECSIZE;
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return (EIO);
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}
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bcopy(d->buf, buf + blks * BIOSDISK_SECSIZE, frag);
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}
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if (rsize)
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*rsize = size;
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return (0);
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}
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#ifdef COMPAT_OLDBOOT
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int
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biosdisk_gettype(f)
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struct open_file *f;
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{
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struct biosdisk *d = f->f_devdata;
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return (d->disktype);
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}
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#endif
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int
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biosdiskopen(f, biosdev, partition)
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struct open_file *f;
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int biosdev;
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unsigned int partition;
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{
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struct biosdisk *d;
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struct dos_partition *dptr;
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int sector;
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int error = 0, i;
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#ifndef NO_DISKLABEL
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struct disklabel *lp;
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#endif
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d = (struct biosdisk *) alloc(sizeof(struct biosdisk));
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if (!d) {
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#ifdef DEBUG
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printf("biosdiskopen: no memory\n");
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#endif
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return (ENOMEM);
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}
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d->ll.dev = biosdev;
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if (set_geometry(&d->ll)) {
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#ifdef DISK_DEBUG
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printf("no geometry information\n");
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#endif
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error = ENXIO;
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goto out;
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}
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/*
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* find NetBSD Partition in DOS partition table XXX check magic???
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*/
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if (readsects(&d->ll, 0, 1, d->buf, 0)) {
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#ifdef DISK_DEBUG
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printf("error reading mbr\n");
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#endif
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error = EIO;
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goto out;
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}
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dptr = (struct dos_partition *) & d->buf[DOSPARTOFF];
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sector = -1;
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for (i = 0; i < NDOSPART; i++, dptr++)
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if (dptr->dp_typ == DOSPTYP_NETBSD) {
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sector = dptr->dp_start;
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break;
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}
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if (sector == -1) {
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/*
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* One of two things:
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* 1. no MBR
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* 2. no NetBSD partition in MBR
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*
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* We simply default to "start of disk" in this case and
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* press on.
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*/
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sector = 0;
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}
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#ifdef NO_DISKLABEL
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d->boff = sector;
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#else
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/* find partition in NetBSD disklabel */
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if (readsects(&d->ll, sector + LABELSECTOR, 1, d->buf, 0)) {
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#ifdef DISK_DEBUG
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printf("Error reading disklabel\n");
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#endif
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error = EIO;
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goto out;
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}
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lp = (struct disklabel *) (d->buf + LABELOFFSET);
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if (lp->d_magic != DISKMAGIC) {
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#ifdef DISK_DEBUG
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printf("warning: no disklabel\n");
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#endif
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d->boff = sector;
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} else if (partition >= lp->d_npartitions ||
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lp->d_partitions[partition].p_fstype == FS_UNUSED) {
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#ifdef DISK_DEBUG
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printf("illegal partition\n");
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#endif
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error = EPART;
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goto out;
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} else {
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d->boff = lp->d_partitions[partition].p_offset;
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#ifdef COMPAT_OLDBOOT
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d->disktype = lp->d_type;
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#endif
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}
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#endif /* NO_DISKLABEL */
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#ifdef DISK_DEBUG
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printf("partition @%d\n", d->boff);
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#endif
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f->f_devdata = d;
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out:
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if (error)
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free(d, sizeof(struct biosdisk));
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return (error);
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}
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int
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biosdiskclose(f)
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struct open_file *f;
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{
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struct biosdisk *d = f->f_devdata;
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if (!(d->ll.dev & 0x80))/* let the floppy drive go off */
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delay(3000000); /* 2s is enough on all PCs I found */
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free(d, sizeof(struct biosdisk));
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f->f_devdata = NULL;
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return (0);
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}
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int
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biosdiskioctl(f, cmd, arg)
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struct open_file *f;
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u_long cmd;
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void *arg;
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{
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return EIO;
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}
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