1/* $NetBSD: mbr.h,v 1.26 2011/06/30 20:09:15 wiz Exp $ */ 2 3/* 4 * Copyright 1997, 1988 Piermont Information Systems Inc. 5 * All rights reserved. 6 * 7 * Written by Philip A. Nelson for Piermont Information Systems Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of Piermont Information Systems Inc. may not be used to endorse 18 * or promote products derived from this software without specific prior 19 * written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY PIERMONT INFORMATION SYSTEMS INC. ``AS IS'' 22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL PIERMONT INFORMATION SYSTEMS INC. BE 25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 31 * THE POSSIBILITY OF SUCH DAMAGE. 32 * 33 */ 34 35#ifndef _MBR_H 36#define _MBR_H 37 38/* 39 * mbr.h -- definitions for reading, writing and editing DOS MBRs. 40 * Use by including from md.h on ports which use MBRs (i386, powerpc, arc) 41 * naming convention: dlxxxx => NetBSD disklabel, bxxxx => bios 42 */ 43 44/* constants and defines */ 45 46#include <sys/bootblock.h> 47 48/* 49 * XXX I (dsl) haven't the foggiest idea what the MBR extended chain 50 * looks like if the sector size isn't 512. 51 */ 52#define MBR_SECSIZE 512 53 54#define MBR_PUT_LSCYL(c) ((c) & 0xff) 55#define MBR_PUT_MSCYLANDSEC(c,s) (((s) & 0x3f) | (((c) >> 2) & 0xc0)) 56 57typedef struct mbr_info_t mbr_info_t; 58struct mbr_info_t { 59 struct mbr_sector mbr; 60#ifdef BOOTSEL 61 struct mbr_bootsel mbrb; /* writeable for any mbr code */ 62 uint oflags; 63#endif 64 uint sector; /* where we read this from */ 65 mbr_info_t *extended; /* next in extended partition list */ 66 mbr_info_t *prev_ext; /* and back ptr */ 67 const char *last_mounted[MBR_PART_COUNT]; 68 /* only in first item... */ 69 int opt; /* entry being edited */ 70 uint install; /* start sector of install partition */ 71#ifdef BOOTSEL 72 uint bootsec; /* start sector of bootmenu default */ 73#endif 74}; 75 76/* incore fdisk (mbr, bios) geometry */ 77int bcyl, bhead, bsec; 78 79mbr_info_t mbr; 80 81#ifdef BOOTSEL 82struct mbr_bootsel *mbs; 83 84 /* sync with src/sbin/fdisk/fdisk.c */ 85#define DEFAULT_BOOTDIR "/usr/mdec" 86#define DEFAULT_BOOTCODE "mbr" 87#define DEFAULT_BOOTSELCODE "mbr_bootsel" 88#define DEFAULT_BOOTEXTCODE "mbr_ext" 89 90/* Scan values for the various keys we use, as returned by the BIOS */ 91#define SCAN_ENTER 0x1c 92#define SCAN_F1 0x3b 93#define SCAN_1 0x2 94 95#endif /* BOOTSEL */ 96 97/* from mbr.c */ 98void set_fdisk_geom(void); /* edit incore BIOS geometry */ 99void disp_cur_geom(void); 100int check_geom(void); /* primitive geometry sanity-check */ 101 102void disp_cur_part(struct mbr_partition *, int, int); 103int edit_mbr(mbr_info_t *); 104int mbr_use_wholedisk(mbr_info_t *); 105int partsoverlap(struct mbr_partition *, int, int); 106 107/* from mbr.c */ 108 109int read_mbr(const char *, mbr_info_t *); 110int write_mbr(const char *, mbr_info_t *, int); 111int valid_mbr(struct mbr_sector *); 112int guess_biosgeom_from_mbr(mbr_info_t *, int *, int *, daddr_t *); 113int set_bios_geom_with_mbr_guess(void); 114void set_bios_geom(int, int, int); 115int otherpart(int); 116int ourpart(int); 117const char *get_partname(int); 118void edit_ptn_bounds(void); 119#ifdef BOOTSEL 120void disp_bootsel(void); 121void edit_bootsel_entry(int); 122void edit_bootsel_timeout(void); 123void edit_bootsel_default_ptn(int); 124void edit_bootsel_default_disk(int); 125void configure_bootsel(void); 126#endif 127 128/* Machine dependent mbr functions */ 129int md_mbr_use_wholedisk(mbr_info_t *mbri); 130int md_check_mbr(mbr_info_t *mbri); 131 132#endif 133