1 /* $NetBSD: mbr.h,v 1.6 2020/10/12 16:14:32 martin 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 57 #define MBR_DEV_LEN 16 /* for wedge names */ 58 59 typedef struct mbr_info_t mbr_info_t; 60 struct mbr_info_t { 61 struct mbr_sector mbr; 62 #ifdef BOOTSEL 63 struct mbr_bootsel mbrb; /* writeable for any mbr code */ 64 uint oflags; 65 #endif 66 uint sector; /* where we read this from */ 67 mbr_info_t *extended; /* next in extended partition list */ 68 const char *last_mounted[MBR_PART_COUNT]; 69 uint fs_type[MBR_PART_COUNT], fs_sub_type[MBR_PART_COUNT]; 70 #ifdef BOOTSEL 71 /* only in first item... */ 72 uint bootsec; /* start sector of bootmenu default */ 73 #endif 74 /* for temporary access */ 75 char wedge[MBR_PART_COUNT][MBR_DEV_LEN]; 76 }; 77 78 #ifdef BOOTSEL 79 extern struct mbr_bootsel *mbs; 80 81 /* sync with src/sbin/fdisk/fdisk.c */ 82 #define DEFAULT_BOOTDIR "/usr/mdec" 83 #define DEFAULT_BOOTCODE "mbr" 84 #define DEFAULT_BOOTSELCODE "mbr_bootsel" 85 #define DEFAULT_BOOTEXTCODE "mbr_ext" 86 87 /* Scan values for the various keys we use, as returned by the BIOS */ 88 #define SCAN_ENTER 0x1c 89 #define SCAN_F1 0x3b 90 #define SCAN_1 0x2 91 92 #endif /* BOOTSEL */ 93 94 /* from mbr.c */ 95 void set_fdisk_geom(void); /* edit incore BIOS geometry */ 96 void disp_cur_geom(void); 97 int check_geom(void); /* primitive geometry sanity-check */ 98 99 void disp_cur_part(struct mbr_partition *, int, int); 100 int partsoverlap(struct mbr_partition *, int, int); 101 102 /* from mbr.c */ 103 104 int guess_biosgeom_from_parts(struct disk_partitions*, int *, int *, int *); 105 /* same return values as edit_outer_parts() */ 106 int set_bios_geom_with_mbr_guess(struct disk_partitions*); 107 void set_bios_geom(struct disk_partitions *, int *cyl, int *head, int *sec); 108 int otherpart(int); 109 int ourpart(int); 110 void edit_ptn_bounds(void); 111 #ifdef BOOTSEL 112 void disp_bootsel(void); 113 void edit_bootsel_entry(int); 114 void edit_bootsel_timeout(void); 115 void edit_bootsel_default_ptn(int); 116 void edit_bootsel_default_disk(int); 117 void configure_bootsel(void); 118 #endif 119 120 /* 121 * MBR specific: check if the chosen partitioning will work 122 * and perform any MD queries/fixup. 123 * With quiet = true, try to avoid user interaction and 124 * never return 1. 125 * 126 * Return value: 127 * 0 -> abort 128 * 1 -> re-edit 129 * 2 -> continue installation 130 */ 131 int md_check_mbr(struct disk_partitions*, mbr_info_t*, bool quiet); 132 133 /* 134 * Called early during updates (before md_pre_update), 135 * returns true if partitions have been modified. 136 */ 137 bool md_mbr_update_check(struct disk_partitions*, mbr_info_t*); 138 139 #endif 140