646 lines
16 KiB
C
646 lines
16 KiB
C
/* $NetBSD: mbr.c,v 1.30 2003/01/10 20:00:28 christos Exp $ */
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/*
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* Copyright 1997 Piermont Information Systems Inc.
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* All rights reserved.
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*
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* Written by Philip A. Nelson for Piermont Information Systems Inc.
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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 by
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* Piermont Information Systems Inc.
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* 4. The name of Piermont Information Systems Inc. may not be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY PIERMONT INFORMATION SYSTEMS INC. ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL PIERMONT INFORMATION SYSTEMS INC. BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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/*
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* Following applies to the geometry guessing code
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*/
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/*
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* Mach Operating System
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* Copyright (c) 1992 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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/* mbr.c -- DOS Master Boot Record editing code */
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#include <sys/param.h>
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#include <sys/types.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <util.h>
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#include "defs.h"
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#include "mbr.h"
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#include "md.h"
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#include "msg_defs.h"
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#include "menu_defs.h"
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#include "endian.h"
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struct part_id {
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int id;
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char *name;
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} part_ids[] = {
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{0, "unused"},
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{MBR_PTYPE_FAT12, "DOS FAT12"},
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{MBR_PTYPE_FAT16S, "DOS FAT16, <32M"},
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{MBR_PTYPE_EXT, "Extended partition"},
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{MBR_PTYPE_FAT16B, "DOS FAT16, >32M"},
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{MBR_PTYPE_NTFS, "NTFS"},
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{MBR_PTYPE_FAT32, "Windows FAT32"},
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{MBR_PTYPE_FAT32L, "Windows FAT32, LBA"},
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{MBR_PTYPE_FAT16L, "Windows FAT16, LBA"},
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{MBR_PTYPE_EXT_LBA, "Extended partition, LBA"},
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{MBR_PTYPE_LNXSWAP, "Linux swap"},
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{MBR_PTYPE_LNXEXT2, "Linux native"},
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{MBR_PTYPE_NTFSVOL, "NTFS volume set"},
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{MBR_PTYPE_386BSD, "old NetBSD/FreeBSD/386BSD"},
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{MBR_PTYPE_NETBSD, "NetBSD"},
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{-1, "Unknown"},
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};
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int dosptyp_nbsd = MBR_PTYPE_NETBSD;
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static int get_mapping (struct mbr_partition *, int, int *, int *, int *,
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long *absolute);
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static void convert_mbr_chs (int, int, int, u_int8_t *, u_int8_t *,
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u_int8_t *, u_int32_t);
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#ifdef notdef
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/*
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* First, geometry stuff...
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*/
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int
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check_geom()
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{
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return bcyl <= 1024 && bsec < 64 && bcyl > 0 && bhead > 0 && bsec > 0;
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}
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#endif
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/*
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* get C/H/S geometry from user via menu interface and
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* store in globals.
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*/
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void
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set_bios_geom(cyl, head, sec)
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int cyl, head, sec;
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{
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char res[80];
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msg_display_add(MSG_setbiosgeom);
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snprintf(res, 80, "%d", cyl);
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msg_prompt_add(MSG_cylinders, res, res, 80);
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bcyl = atoi(res);
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snprintf(res, 80, "%d", head);
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msg_prompt_add(MSG_heads, res, res, 80);
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bhead = atoi(res);
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snprintf(res, 80, "%d", sec);
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msg_prompt_add(MSG_sectors, res, res, 80);
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bsec = atoi(res);
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}
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#ifdef notdef
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void
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disp_cur_geom()
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{
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msg_display_add(MSG_realgeom, dlcyl, dlhead, dlsec);
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msg_display_add(MSG_biosgeom, bcyl, bhead, bsec);
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}
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#endif
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/*
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* Then, the partition stuff...
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*/
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int
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otherpart(id)
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int id;
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{
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return (id != 0 && id != MBR_PTYPE_386BSD && id != MBR_PTYPE_NETBSD);
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}
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int
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ourpart(id)
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int id;
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{
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return (id == MBR_PTYPE_386BSD || id == MBR_PTYPE_NETBSD);
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}
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/*
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* Let user change incore Master Boot Record partitions via menu.
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*/
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int
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edit_mbr(partition)
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struct mbr_partition *partition;
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{
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int i, j;
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/* Ask full/part */
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/* XXX this sucks ("part" is used in menus, no param passing there) */
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part = partition;
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msg_display(MSG_fullpart, diskdev);
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process_menu(MENU_fullpart);
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/* DOS fdisk label checking and value setting. */
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if (usefull) {
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int otherparts = 0;
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int ourparts = 0;
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/* Count nonempty, non-BSD partitions. */
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for (i = 0; i < NMBRPART; i++) {
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otherparts += otherpart(part[i].mbrp_typ);
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/* check for dualboot *bsd too */
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ourparts += ourpart(part[i].mbrp_typ);
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}
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/* Ask if we really want to blow away non-NetBSD stuff */
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if (otherparts != 0 || ourparts > 1) {
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msg_display(MSG_ovrwrite);
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process_menu(MENU_noyes);
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if (!yesno) {
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if (logging)
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(void)fprintf(logfp, "User answered no to destroy other data, aborting.\n");
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return 0;
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}
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}
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/* Set the partition information for full disk usage. */
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part[0].mbrp_typ = part[0].mbrp_flag = 0;
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part[0].mbrp_start = part[0].mbrp_size = 0;
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part[1].mbrp_typ = part[0].mbrp_flag = 0;
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part[1].mbrp_start = part[0].mbrp_size = 0;
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part[2].mbrp_typ = part[0].mbrp_flag = 0;
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part[2].mbrp_start = part[0].mbrp_size = 0;
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part[3].mbrp_typ = dosptyp_nbsd;
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part[3].mbrp_size = bsize - bsec;
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part[3].mbrp_start = bsec;
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part[3].mbrp_flag = 0x80;
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ptstart = bsec;
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ptsize = bsize - bsec;
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fsdsize = dlsize;
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fsptsize = dlsize - bsec;
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fsdmb = fsdsize / MEG;
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activepart = 3;
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} else {
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int numbsd, overlap;
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int numfreebsd, freebsdpart; /* dual-boot */
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/* Ask for sizes, which partitions, ... */
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ask_sizemult(bcylsize);
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bsdpart = freebsdpart = -1;
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activepart = -1;
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for (i = 0; i<4; i++)
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if (part[i].mbrp_flag != 0) {
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activepart = i;
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part[i].mbrp_flag = 0;
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}
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do {
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process_menu (MENU_editparttable);
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numbsd = 0;
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bsdpart = -1;
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freebsdpart = -1;
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numfreebsd = 0;
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overlap = 0;
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yesno = 0;
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for (i=0; i<4; i++) {
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/* Count 386bsd/FreeBSD/NetBSD(old) partitions */
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if (part[i].mbrp_typ == MBR_PTYPE_386BSD) {
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freebsdpart = i;
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numfreebsd++;
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}
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/* Count NetBSD-only partitions */
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if (part[i].mbrp_typ == MBR_PTYPE_NETBSD) {
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bsdpart = i;
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numbsd++;
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}
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for (j = i+1; j<4; j++)
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if (partsoverlap(part, i,j))
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overlap = 1;
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}
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/* If no new-NetBSD partition, use 386bsd instead */
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if (numbsd == 0 && numfreebsd > 0) {
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numbsd = numfreebsd;
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bsdpart = freebsdpart;
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/* XXX check partition type? */
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}
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/* Check for overlap or multiple native partitions */
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if (overlap || numbsd != 1) {
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msg_display(MSG_reeditpart);
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process_menu(MENU_yesno);
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}
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} while (yesno && (numbsd != 1 || overlap));
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if (numbsd == 0) {
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msg_display(MSG_nobsdpart);
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process_menu(MENU_ok);
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return 0;
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}
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if (numbsd > 1) {
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msg_display(MSG_multbsdpart, bsdpart);
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process_menu(MENU_ok);
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}
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if (activepart == -1) {
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msg_display(MSG_noactivepart);
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process_menu(MENU_yesno);
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if (yesno)
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part[bsdpart].mbrp_flag = 0x80;
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} else
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part[activepart].mbrp_flag = 0x80;
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if (bsdpart == freebsdpart) {
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msg_display(MSG_upgradeparttype);
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process_menu(MENU_yesno);
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if (yesno)
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part[bsdpart].mbrp_typ = dosptyp_nbsd;
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}
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ptstart = part[bsdpart].mbrp_start;
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ptsize = part[bsdpart].mbrp_size;
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fsdsize = dlsize;
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if (ptstart + ptsize < bsize)
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fsptsize = ptsize;
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else
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fsptsize = dlsize - ptstart;
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fsdmb = fsdsize / MEG;
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/* Ask if a boot selector is wanted. XXXX */
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}
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/* Compute minimum NetBSD partition sizes (in sectors). */
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minfsdmb = (80 + 4*rammb) * (MEG / sectorsize);
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return 1;
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}
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int
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partsoverlap(part, i, j)
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struct mbr_partition *part;
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int i;
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int j;
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{
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/*
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* If the size or type of either partition is zero, they don't
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* overlap by definition.
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*/
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if (part[i].mbrp_size == 0 || part[j].mbrp_size == 0 ||
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part[i].mbrp_typ == 0 || part[j].mbrp_typ == 0)
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return 0;
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return
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(part[i].mbrp_start < part[j].mbrp_start &&
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part[i].mbrp_start + part[i].mbrp_size > part[j].mbrp_start)
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||
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(part[i].mbrp_start > part[j].mbrp_start &&
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part[i].mbrp_start < part[j].mbrp_start + part[j].mbrp_size)
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||
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(part[i].mbrp_start == part[j].mbrp_start);
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}
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char *
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get_partname(i)
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int i;
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{
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int j;
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for (j = 0; part_ids[j].id != -1 &&
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part_ids[j].id != part[i].mbrp_typ; j++);
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return part_ids[j].name;
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}
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void
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disp_cur_part(part, sel, disp)
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struct mbr_partition *part;
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int sel;
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int disp;
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{
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int i, start, stop, rsize, rend;
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if (disp < 0)
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start = 0, stop = 4;
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else
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start = disp, stop = disp+1;
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msg_table_add(MSG_part_header, dlsize/sizemult, multname, multname,
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multname, multname);
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for (i = start; i < stop; i++) {
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if (sel == i)
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msg_standout();
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if (part[i].mbrp_typ == 0 ||
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(part[i].mbrp_size == 0 && part[i].mbrp_start == 0))
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msg_table_add(MSG_part_row_start_unused, i);
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else {
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rsize = part[i].mbrp_size / sizemult;
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if (part[i].mbrp_size % sizemult)
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rsize++;
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rend = (part[i].mbrp_start + part[i].mbrp_size) / sizemult;
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if ((part[i].mbrp_start + part[i].mbrp_size) % sizemult)
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rend++;
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msg_table_add(MSG_part_row_start_used, i,
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part[i].mbrp_start / sizemult, rend, rsize);
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}
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msg_table_add(MSG_part_row_end, get_partname(i));
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if (sel == i)
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msg_standend();
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}
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}
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int
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read_mbr(disk, buf, len)
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char *disk, *buf;
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size_t len;
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{
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char diskpath[MAXPATHLEN];
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int fd, i;
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struct mbr_partition *mbrp;
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/* Open the disk. */
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fd = opendisk(disk, O_RDONLY, diskpath, sizeof(diskpath), 0);
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if (fd < 0)
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return -1;
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if (lseek(fd, (off_t)(MBR_BBSECTOR * MBR_SECSIZE), SEEK_SET) < 0) {
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close(fd);
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return -1;
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}
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if (read(fd, buf, len) < len) {
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close(fd);
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return -1;
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}
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if (valid_mbr(buf)) {
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mbrp = (struct mbr_partition *)(void *)&buf[MBR_PARTOFF];
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for (i = 0; i < NMBRPART; i++) {
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if (mbrp[i].mbrp_typ != 0) {
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mbrp[i].mbrp_start =
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le_to_native32(mbrp[i].mbrp_start);
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mbrp[i].mbrp_size =
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le_to_native32(mbrp[i].mbrp_size);
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} else {
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/* type is unused, discard scum */
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mbrp[i].mbrp_start = 0;
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mbrp[i].mbrp_size = 0;
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}
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}
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}
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(void)close(fd);
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return 0;
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}
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int
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write_mbr(disk, buf, len, convert)
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char *disk, *buf;
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size_t len;
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int convert;
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{
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char diskpath[MAXPATHLEN];
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int fd, i, ret = 0;
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struct mbr_partition *mbrp;
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u_int32_t pstart, psize;
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/* Open the disk. */
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fd = opendisk(disk, O_WRONLY, diskpath, sizeof(diskpath), 0);
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if (fd < 0)
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return -1;
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if (lseek(fd, (off_t)(MBR_BBSECTOR * MBR_SECSIZE), SEEK_SET) < 0) {
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close(fd);
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return -1;
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}
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mbrp = (struct mbr_partition *)(void *)&buf[MBR_PARTOFF];
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for (i = 0; i < NMBRPART; i++) {
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if (mbrp[i].mbrp_start == 0 &&
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mbrp[i].mbrp_size == 0) {
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mbrp[i].mbrp_scyl = 0;
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mbrp[i].mbrp_shd = 0;
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mbrp[i].mbrp_ssect = 0;
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mbrp[i].mbrp_ecyl = 0;
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mbrp[i].mbrp_ehd = 0;
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mbrp[i].mbrp_esect = 0;
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} else {
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pstart = mbrp[i].mbrp_start;
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psize = mbrp[i].mbrp_size;
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mbrp[i].mbrp_start = native_to_le32(pstart);
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mbrp[i].mbrp_size = native_to_le32(psize);
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if (convert) {
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convert_mbr_chs(bcyl, bhead, bsec,
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&mbrp[i].mbrp_scyl, &mbrp[i].mbrp_shd,
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&mbrp[i].mbrp_ssect, pstart);
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convert_mbr_chs(bcyl, bhead, bsec,
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&mbrp[i].mbrp_ecyl, &mbrp[i].mbrp_ehd,
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&mbrp[i].mbrp_esect, pstart + psize - 1);
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}
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}
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}
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if (write(fd, buf, len) < 0)
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ret = -1;
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(void)close(fd);
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return ret;
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}
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int
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valid_mbr(buf)
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char *buf;
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{
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u_int16_t magic;
|
|
|
|
magic = *((u_int16_t *)(void *)&buf[MBR_MAGICOFF]);
|
|
|
|
return (le_to_native16(magic) == MBR_MAGIC);
|
|
}
|
|
|
|
static void
|
|
convert_mbr_chs(cyl, head, sec, cylp, headp, secp, relsecs)
|
|
int cyl, head, sec;
|
|
u_int8_t *cylp, *headp, *secp;
|
|
u_int32_t relsecs;
|
|
{
|
|
unsigned int tcyl, temp, thead, tsec;
|
|
|
|
temp = cyl * head * sec - 1;
|
|
if (relsecs >= temp)
|
|
relsecs = temp;
|
|
|
|
temp = head * sec;
|
|
tcyl = relsecs / temp;
|
|
|
|
relsecs %= temp;
|
|
thead = relsecs / sec;
|
|
|
|
tsec = (relsecs % sec) + 1;
|
|
|
|
*cylp = MBR_PUT_LSCYL(tcyl);
|
|
*headp = thead;
|
|
*secp = MBR_PUT_MSCYLANDSEC(tcyl, tsec);
|
|
}
|
|
|
|
/*
|
|
* This function is ONLY to be used as a last resort to provide a
|
|
* hint for the user. Ports should provide a more reliable way
|
|
* of getting the BIOS geometry. The i386 code, for example,
|
|
* uses the BIOS geometry as passed on from the bootblocks,
|
|
* and only uses this as a hint to the user when that information
|
|
* is not present, or a match could not be made with a NetBSD
|
|
* device.
|
|
*/
|
|
int
|
|
guess_biosgeom_from_mbr(buf, cyl, head, sec)
|
|
char *buf;
|
|
int *cyl, *head, *sec;
|
|
{
|
|
struct mbr_partition *parts = (struct mbr_partition *)(void *)&buf[MBR_PARTOFF];
|
|
int cylinders = -1, heads = -1, sectors = -1, i, j;
|
|
int c1, h1, s1, c2, h2, s2;
|
|
long a1, a2;
|
|
quad_t num, denom;
|
|
|
|
*cyl = *head = *sec = -1;
|
|
|
|
/* Try to deduce the number of heads from two different mappings. */
|
|
for (i = 0; i < NMBRPART * 2; i++) {
|
|
if (get_mapping(parts, i, &c1, &h1, &s1, &a1) < 0)
|
|
continue;
|
|
for (j = 0; j < 8; j++) {
|
|
if (get_mapping(parts, j, &c2, &h2, &s2, &a2) < 0)
|
|
continue;
|
|
num = (quad_t)h1*(a2-s2) - (quad_t)h2*(a1-s1);
|
|
denom = (quad_t)c2*(a1-s1) - (quad_t)c1*(a2-s2);
|
|
if (denom != 0 && num % denom == 0) {
|
|
heads = (int)(num / denom);
|
|
break;
|
|
}
|
|
}
|
|
if (heads != -1)
|
|
break;
|
|
}
|
|
|
|
if (heads == -1)
|
|
return -1;
|
|
|
|
/* Now figure out the number of sectors from a single mapping. */
|
|
for (i = 0; i < NMBRPART * 2; i++) {
|
|
if (get_mapping(parts, i, &c1, &h1, &s1, &a1) < 0)
|
|
continue;
|
|
num = a1 - s1;
|
|
denom = c1 * heads + h1;
|
|
if (denom != 0 && num % denom == 0) {
|
|
sectors = (int)(num / denom);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (sectors == -1)
|
|
return -1;
|
|
|
|
/*
|
|
* Estimate the number of cylinders.
|
|
* XXX relies on get_disks having been called.
|
|
*/
|
|
cylinders = disk->dd_totsec / heads / sectors;
|
|
|
|
/* Now verify consistency with each of the partition table entries.
|
|
* Be willing to shove cylinders up a little bit to make things work,
|
|
* but translation mismatches are fatal. */
|
|
for (i = 0; i < NMBRPART * 2; i++) {
|
|
if (get_mapping(parts, i, &c1, &h1, &s1, &a1) < 0)
|
|
continue;
|
|
if (sectors * (c1 * heads + h1) + s1 != a1)
|
|
return -1;
|
|
if (c1 >= cylinders)
|
|
cylinders = c1 + 1;
|
|
}
|
|
|
|
/* Everything checks out. Reset the geometry to use for further
|
|
* calculations. */
|
|
*cyl = cylinders;
|
|
*head = heads;
|
|
*sec = sectors;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
get_mapping(parts, i, cylinder, head, sector, absolute)
|
|
struct mbr_partition *parts;
|
|
int i, *cylinder, *head, *sector;
|
|
long *absolute;
|
|
{
|
|
struct mbr_partition *apart = &parts[i / 2];
|
|
|
|
if (apart->mbrp_typ == 0)
|
|
return -1;
|
|
if (i % 2 == 0) {
|
|
*cylinder = MBR_PCYL(apart->mbrp_scyl, part->mbrp_ssect);
|
|
*head = apart->mbrp_shd;
|
|
*sector = MBR_PSECT(apart->mbrp_ssect) - 1;
|
|
*absolute = apart->mbrp_start;
|
|
} else {
|
|
*cylinder = MBR_PCYL(apart->mbrp_ecyl, apart->mbrp_esect);
|
|
*head = apart->mbrp_ehd;
|
|
*sector = MBR_PSECT(apart->mbrp_esect) - 1;
|
|
*absolute = apart->mbrp_start + apart->mbrp_size - 1;
|
|
}
|
|
return 0;
|
|
}
|