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388 lines
8.9 KiB
C
388 lines
8.9 KiB
C
/* $NetBSD: biosdisk.c,v 1.3 2011/07/17 20:54:43 joerg Exp $ */
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/*
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* Copyright (c) 1996, 1998
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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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*
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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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* A lot of this must match sys/kern/subr_disk_mbr.c
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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 <lib/libsa/loadfile.h>
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#include <machine/disklabel.h>
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#include "biosdisk.h"
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#include "biosdisk_ll.h"
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#include "bootinfo.h"
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#define BUFSIZE (1 * BIOSDISK_SECSIZE)
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struct biosdisk {
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int dev;
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int boff;
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char buf[BUFSIZE];
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};
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static struct btinfo_bootdisk bi_disk;
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#define RF_PROTECTED_SECTORS 64 /* XXX refer to <.../rf_optnames.h> */
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static struct biosdisk *
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alloc_biosdisk(int dev)
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{
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struct biosdisk *d;
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d = (struct biosdisk *)ALLOC(sizeof(*d));
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if (d == NULL)
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return (NULL);
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memset(d, 0, sizeof(*d));
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d->dev = dev;
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return (d);
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}
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static int
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check_label(struct biosdisk *d, int sector)
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{
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struct disklabel *lp;
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/* find partition in NetBSD disklabel */
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if (readsects(d->dev, sector + LABELSECTOR, d->buf, 1)) {
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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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return (EIO);
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}
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lp = (struct disklabel *)(d->buf + LABELOFFSET);
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if (lp->d_magic != DISKMAGIC || dkcksum(lp)) {
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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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return (-1);
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}
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d->boff = sector;
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return (0);
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}
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static int
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read_label(struct biosdisk *d)
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{
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struct mbr_sector *mbr_sect;
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struct disklabel dflt_lbl;
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struct mbr_partition mbr[MBR_PART_COUNT];
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struct partition *p;
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int sector, i;
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int error;
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int typ;
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int ext_base, this_ext, next_ext;
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#ifdef COMPAT_386BSD_MBRPART
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int sector_386bsd = -1;
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#endif
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memset(&dflt_lbl, 0, sizeof dflt_lbl);
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dflt_lbl.d_npartitions = 8;
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d->boff = 0;
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/*
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* find NetBSD Partition in DOS partition table
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* XXX check magic???
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*/
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ext_base = 0;
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next_ext = 0;
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for (;;) {
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this_ext = ext_base + next_ext;
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next_ext = 0;
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mbr_sect = (struct mbr_sector *)d->buf;
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memcpy(&mbr, mbr_sect->mbr_parts, sizeof(mbr));
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if (readsects(d->dev, this_ext, d->buf, 1)) {
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#ifdef DISK_DEBUG
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printf("error reading MBR sector %d\n", this_ext);
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#endif
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return (EIO);
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}
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memcpy(&mbr, mbr_sect->mbr_parts, sizeof(mbr));
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/* Look for NetBSD partition ID */
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for (i = 0; i < MBR_PART_COUNT; i++) {
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typ = mbr[i].mbrp_type;
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if (typ == 0)
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continue;
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sector = this_ext + mbr[i].mbrp_start;
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if (typ == MBR_PTYPE_NETBSD) {
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error = check_label(d, sector);
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if (error >= 0)
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return error;
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}
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if (MBR_IS_EXTENDED(typ)) {
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next_ext = mbr[i].mbrp_start;
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continue;
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}
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#ifdef COMPAT_386BSD_MBRPART
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if (this_ext == 0 && typ == MBR_PTYPE_386BSD)
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sector_386bsd = sector;
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#endif
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if (this_ext != 0) {
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if (dflt_lbl.d_npartitions >= MAXPARTITIONS)
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continue;
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p = &dflt_lbl.d_partitions[dflt_lbl.d_npartitions++];
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} else
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p = &dflt_lbl.d_partitions[i];
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p->p_offset = sector;
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p->p_size = mbr[i].mbrp_size;
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p->p_fstype = xlat_mbr_fstype(typ);
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}
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if (next_ext == 0)
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break;
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if (ext_base == 0) {
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ext_base = next_ext;
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next_ext = 0;
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}
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}
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sector = 0;
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#ifdef COMPAT_386BSD_MBRPART
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if (sector_386bsd != -1) {
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printf("old BSD partition ID!\n");
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sector = sector_386bsd;
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}
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#endif
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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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error = check_label(d, sector);
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if (error >= 0)
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return (error);
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/*
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* Nothing at start of disk, return info from mbr partitions.
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*/
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/* XXX fill it to make checksum match kernel one */
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dflt_lbl.d_checksum = dkcksum(&dflt_lbl);
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memcpy(d->buf, &dflt_lbl, sizeof(dflt_lbl));
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return (-1);
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}
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/*
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* Determine likely partition for possible sector number of dos
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* partition.
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*/
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u_int
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biosdisk_findptn(int biosdev, u_int sector)
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{
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struct biosdisk *d;
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u_int partition = 0;
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struct disklabel *lp;
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/* Look for netbsd partition that is the dos boot one */
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d = alloc_biosdisk(biosdev);
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if (d == NULL)
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return (0);
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if (read_label(d) == 0) {
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lp = (struct disklabel *)(d->buf + LABELOFFSET);
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for (partition = lp->d_npartitions; --partition;){
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if (lp->d_partitions[partition].p_fstype == FS_UNUSED)
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continue;
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if (lp->d_partitions[partition].p_offset == sector)
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break;
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}
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}
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DEALLOC(d, sizeof(*d));
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return (partition);
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}
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int
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biosdisk_open(struct open_file *f, ...)
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{
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va_list ap;
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struct biosdisk *d;
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struct disklabel *lp;
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int dev;
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int partition;
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int error = 0;
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va_start(ap, f);
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dev = va_arg(ap, int);
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d = alloc_biosdisk(dev);
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if (d == NULL) {
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error = ENXIO;
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goto out;
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}
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partition = va_arg(ap, int);
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bi_disk.biosdev = d->dev;
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bi_disk.partition = partition;
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bi_disk.labelsector = -1;
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if (partition == RAW_PART)
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goto nolabel;
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error = read_label(d);
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if (error == -1) {
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error = 0;
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goto nolabel;
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}
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if (error)
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goto out;
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lp = (struct disklabel *)(d->buf + LABELOFFSET);
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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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}
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bi_disk.labelsector = d->boff + LABELSECTOR;
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bi_disk.label.type = lp->d_type;
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memcpy(bi_disk.label.packname, lp->d_packname, 16);
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bi_disk.label.checksum = lp->d_checksum;
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d->boff = lp->d_partitions[partition].p_offset;
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if (lp->d_partitions[partition].p_fstype == FS_RAID) {
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d->boff += RF_PROTECTED_SECTORS;
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}
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nolabel:
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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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BI_ADD(&bi_disk, BTINFO_BOOTDISK, sizeof(bi_disk));
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f->f_devdata = d;
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out:
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va_end(ap);
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if (error)
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DEALLOC(d, sizeof(struct biosdisk));
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return (error);
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}
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int
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biosdisk_close(struct open_file *f)
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{
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struct biosdisk *d = f->f_devdata;
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DEALLOC(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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biosdisk_ioctl(struct open_file *f, u_long cmd, void *arg)
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{
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return (EIO);
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}
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int
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biosdisk_strategy(void *devdata, int flag, daddr_t dblk, size_t size, void *buf, size_t *rsize)
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{
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struct biosdisk *d;
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int blks;
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int 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->dev, dblk, buf, blks)) {
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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->dev, dblk + blks, d->buf, 1)) {
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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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memcpy(buf + blks * BIOSDISK_SECSIZE, d->buf, 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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