freeldr/freeldr/fs.h

   1 /*
   2  *  FreeLoader
   3  *  Copyright (C) 1999, 2000, 2001  Brian Palmer  <brianp@sginet.com>
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19
  20 #ifndef __FS_H
  21 #define __FS_H
  22
  23 //
  24 // Define the structure of a partition table entry
  25 //
  26 typedef struct _PARTITION_TABLE_ENTRY
  27 {
  28         BYTE    BootIndicator;                                  // 0x00 - non-bootable partition, 0x80 - bootable partition (one partition only)
  29         BYTE    StartHead;                                              // Beginning head number
  30         BYTE    StartSector;                                    // Beginning sector (2 high bits of cylinder #)
  31         BYTE    StartCylinder;                                  // Beginning cylinder# (low order bits of cylinder #)
  32         BYTE    SystemIndicator;                                // System indicator
  33         BYTE    EndHead;                                                // Ending head number
  34         BYTE    EndSector;                                              // Ending sector (2 high bits of cylinder #)
  35         BYTE    EndCylinder;                                    // Ending cylinder# (low order bits of cylinder #)
  36         DWORD   SectorCountBeforePartition;             // Number of sectors preceding the partition
  37         DWORD   PartitionSectorCount;                   // Number of sectors in the partition
  38
  39 } PACKED PARTITION_TABLE_ENTRY, *PPARTITION_TABLE_ENTRY;
  40
  41 //
  42 // This macro will return the cylinder when you pass it a cylinder/sector
  43 // pair where the high 2 bits of the cylinder are stored in the sector byte
  44 //
  45 #define MAKE_CYLINDER(cylinder, sector) ( cylinder + ((((WORD)sector) & 0xC0) << 2) )
  46
  47 //
  48 // Define the structure of the master boot record
  49 //
  50 typedef struct _MASTER_BOOT_RECORD
  51 {
  52         BYTE                                    MasterBootRecordCodeAndData[0x1be];
  53         PARTITION_TABLE_ENTRY   PartitionTable[4];
  54         WORD                                    MasterBootRecordMagic;
  55
  56 } PACKED MASTER_BOOT_RECORD, *PMASTER_BOOT_RECORD;
  57
  58 //
  59 // Partition type defines
  60 //
  61 #define PARTITION_ENTRY_UNUSED          0x00      // Entry unused
  62 #define PARTITION_FAT_12                0x01      // 12-bit FAT entries
  63 #define PARTITION_XENIX_1               0x02      // Xenix
  64 #define PARTITION_XENIX_2               0x03      // Xenix
  65 #define PARTITION_FAT_16                0x04      // 16-bit FAT entries
  66 #define PARTITION_EXTENDED              0x05      // Extended partition entry
  67 #define PARTITION_HUGE                  0x06      // Huge partition MS-DOS V4
  68 #define PARTITION_IFS                   0x07      // IFS Partition
  69 #define PARTITION_OS2BOOTMGR            0x0A      // OS/2 Boot Manager/OPUS/Coherent swap
  70 #define PARTITION_FAT32                 0x0B      // FAT32
  71 #define PARTITION_FAT32_XINT13          0x0C      // FAT32 using extended int13 services
  72 #define PARTITION_XINT13                0x0E      // Win95 partition using extended int13 services
  73 #define PARTITION_XINT13_EXTENDED       0x0F      // Same as type 5 but uses extended int13 services
  74 #define PARTITION_PREP                  0x41      // PowerPC Reference Platform (PReP) Boot Partition
  75 #define PARTITION_LDM                   0x42      // Logical Disk Manager partition
  76 #define PARTITION_UNIX                  0x63      // Unix
  77
  78 typedef struct _GEOMETRY
  79 {
  80         ULONG   Cylinders;
  81         ULONG   Heads;
  82         ULONG   Sectors;
  83         ULONG   BytesPerSector;
  84
  85 } GEOMETRY, *PGEOMETRY;
  86
  87 #define FILE VOID
  88 #define PFILE FILE *
  89
  90 VOID    FileSystemError(PUCHAR ErrorString);
  91 BOOL    OpenDiskDrive(ULONG DriveNumber, ULONG PartitionNumber);
  92 VOID    SetDriveGeometry(ULONG Cylinders, ULONG Heads, ULONG Sectors, ULONG BytesPerSector);
  93 VOID    SetVolumeProperties(ULONG HiddenSectors);
  94 BOOL    ReadMultipleLogicalSectors(ULONG SectorNumber, ULONG SectorCount, PVOID Buffer);
  95 BOOL    ReadLogicalSector(ULONG SectorNumber, PVOID Buffer);
  96 PFILE   OpenFile(PUCHAR FileName);
  97 VOID    CloseFile(PFILE FileHandle);
  98 BOOL    ReadFile(PFILE FileHandle, ULONG BytesToRead, PULONG BytesRead, PVOID Buffer);
  99 ULONG   GetFileSize(PFILE FileHandle);
 100 VOID    SetFilePointer(PFILE FileHandle, ULONG NewFilePointer);
 101 ULONG   GetFilePointer(PFILE FileHandle);
 102 BOOL    IsEndOfFile(PFILE FileHandle);
 103
 104
 105 #define EOF     -1
 106
 107 #define ATTR_NORMAL             0x00
 108 #define ATTR_READONLY   0x01
 109 #define ATTR_HIDDEN             0x02
 110 #define ATTR_SYSTEM             0x04
 111 #define ATTR_VOLUMENAME 0x08
 112 #define ATTR_DIRECTORY  0x10
 113 #define ATTR_ARCHIVE    0x20
 114
 115 #define FS_FAT                  1
 116 #define FS_NTFS                 2
 117 #define FS_EXT2                 3
 118
 119 #define FAT12                   1
 120 #define FAT16                   2
 121 #define FAT32                   3
 122
 123 #endif // #defined __FS_H