usr/src/cmd/fs.d/pcfs/fsck/pcfs_bpb.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 1999 by Sun Microsystems, Inc.
  24  * All rights reserved.
  25  */
  26
  27 #ifndef _PCFS_BPB_H
  28 #define _PCFS_BPB_H
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 #ifdef __cplusplus
  33 extern "C" {
  34 #endif
  35
  36 /*
  37  * Common Bios Parameter Block definitions for the pcfs user-level utilities
  38  *
  39  * At press time these definitions are duplicated in mkfs_pcfs.h.  They really
  40  * need to be separated out of mkfs_pcfs.h and then it should reference this
  41  * file.
  42  */
  43 #define BPSEC           512     /* Assumed # of bytes per sector */
  44
  45 #define OPCODE1         0xE9
  46 #define OPCODE2         0xEB
  47 #define BOOTSECSIG      0xAA55
  48
  49 /*
  50  * Offset (in bytes) from address of boot sector to where we put
  51  * the backup copy of that sector.  (FAT32 only)
  52  */
  53 #define BKUP_BOOTSECT_OFFSET    0xC00
  54
  55 #define uppercase(c)    ((c) >= 'a' && (c) <= 'z' ? (c) - 'a' + 'A' : (c))
  56
  57 #define FAT12_TYPE_STRING       "FAT12   "
  58 #define FAT16_TYPE_STRING       "FAT16   "
  59 #define FAT32_TYPE_STRING       "FAT32   "
  60
  61 #define FAT12_ENTSPERSECT       341
  62 #define FAT16_ENTSPERSECT       256
  63 #define FAT32_ENTSPERSECT       128
  64
  65 #ifndef SUNIXOSBOOT
  66 #define SUNIXOSBOOT     190     /* Solaris UNIX boot partition */
  67 #endif
  68
  69 /*
  70  *      MS-DOS Disk layout:
  71  *
  72  *      ---------------------
  73  *      |    Boot sector    |
  74  *      |-------------------|
  75  *      |   Reserved area   |
  76  *      |-------------------|
  77  *      |       FAT #1      |
  78  *      |-------------------|
  79  *      |       FAT #2      |
  80  *      |-------------------|
  81  *      |   Root directory  |
  82  *      |-------------------|
  83  *      |                   |
  84  *      |     File area     |
  85  *      |___________________|
  86  */
  87 #ifdef i386
  88 #pragma pack(1)
  89 #endif
  90 struct _orig_bios_param_blk {
  91         uint16_t bytes_per_sector;
  92         uchar_t  sectors_per_cluster;
  93         uint16_t resv_sectors;
  94         uchar_t  num_fats;
  95         uint16_t num_root_entries;
  96 /*
  97  *  The sectors_in_volume field will be zero on larger volumes (>32Mb)
  98  *  and newer file systems (>=MSDOS4.0).  In these cases the
  99  *  sectors_in_logical_volume field should be used instead.
 100  */
 101         uint16_t sectors_in_volume;
 102         uchar_t  media;
 103         uint16_t sectors_per_fat;
 104         uint16_t sectors_per_track;
 105         uint16_t heads;
 106 /*
 107  *  Number of sectors in the partition prior to the start of the logical disk
 108  */
 109         uint32_t hidden_sectors;
 110         uint32_t sectors_in_logical_volume;
 111 };
 112 #ifdef i386
 113 #pragma pack()
 114 #endif
 115
 116 #ifdef i386
 117 #pragma pack(1)
 118 #endif
 119 struct _bpb32_extensions {
 120         uint32_t big_sectors_per_fat;
 121         uint16_t ext_flags;
 122         uchar_t  fs_vers_lo;
 123         uchar_t  fs_vers_hi;
 124         uint32_t root_dir_clust;
 125         uint16_t fsinfosec;
 126         uint16_t backupboot;
 127         uint16_t reserved[6];
 128 };
 129 #ifdef i386
 130 #pragma pack()
 131 #endif
 132
 133 #ifdef i386
 134 #pragma pack(1)
 135 #endif
 136 struct _bpb_extensions {
 137         uchar_t  phys_drive_num;
 138         uchar_t  reserved;
 139         uchar_t  ext_signature;
 140         uint32_t volume_id;
 141         uchar_t  volume_label[11];
 142         uchar_t  type[8];
 143 };
 144 #ifdef i386
 145 #pragma pack()
 146 #endif
 147
 148 #ifdef i386
 149 #pragma pack(1)
 150 #endif
 151 struct _sun_bpb_extensions {
 152         uint16_t  bs_offset_high;
 153         uint16_t  bs_offset_low;
 154 };
 155 #ifdef i386
 156 #pragma pack()
 157 #endif
 158
 159 /*
 160  * bpb_t is a conglomeration of all the fields a bpb can have.  Every
 161  * bpb will have the orig_bios struct, but only FAT32's will have bpb32,
 162  * and only Solaris boot diskettes will have the sunbpb structure.
 163  */
 164 typedef struct _bios_param_blk {
 165         struct _orig_bios_param_blk bpb;
 166         struct _bpb32_extensions    bpb32;
 167         struct _bpb_extensions      ebpb;
 168         struct _sun_bpb_extensions  sunbpb;
 169 } bpb_t;
 170
 171 #ifdef i386
 172 #pragma pack(1)
 173 struct _bpb_head {
 174         uchar_t                     bs_jump_code[3];
 175         uchar_t                     bs_oem_name[8];
 176         struct _orig_bios_param_blk bs_bpb;
 177 };
 178 #pragma pack()
 179
 180 #pragma pack(1)
 181 struct _boot_sector {
 182         struct _bpb_head            bs_front;
 183         struct _bpb_extensions      bs_ebpb;
 184         struct _sun_bpb_extensions  bs_sebpb;
 185         uchar_t                     bs_bootstrap[444];
 186         uchar_t                     bs_signature[2];
 187 };
 188 #pragma pack()
 189
 190 #pragma pack(1)
 191 struct _boot_sector32 {
 192         struct _bpb_head            bs_front;
 193         struct _bpb32_extensions    bs_bpb32;
 194         struct _bpb_extensions      bs_ebpb;
 195         uchar_t                     bs_bootstrap[420];
 196         uchar_t                     bs_signature[2];
 197 };
 198 #pragma pack()
 199 #else
 200 #define ORIG_BPB_START_INDEX    8       /* index into filler field */
 201 #define EXT_BPB_START_INDEX     33      /* index into filler field */
 202 #define BPB_32_START_INDEX      33      /* index into filler field */
 203 #define EXT_BPB_32_START_INDEX  61      /* index into filler field */
 204 struct _boot_sector {
 205         uchar_t  bs_jump_code[3];
 206         uchar_t  bs_filler[59];
 207         uchar_t  bs_sun_bpb[4];
 208         uchar_t  bs_bootstrap[444];
 209         uchar_t  bs_signature[2];
 210 };
 211
 212 struct _boot_sector32 {
 213         uchar_t  bs_jump_code[3];
 214         uchar_t  bs_filler[87];
 215         uchar_t  bs_bootstrap[420];
 216         uchar_t  bs_signature[2];
 217 };
 218 #endif
 219
 220 typedef union _ubso {
 221         struct _boot_sector     bs;
 222         struct _boot_sector32   bs32;
 223         struct mboot            mb;
 224         uchar_t                 buf[BPSEC];
 225 } boot_sector_t;
 226
 227 #ifdef __cplusplus
 228 }
 229 #endif
 230
 231 #endif /* _PCFS_BPB_H */