freeldr/freeldr/disk.h

   1 /*
   2  *  FreeLoader
   3  *  Copyright (C) 1998-2002  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 __DISK_H
  21 #define __DISK_H
  22
  23
  24 typedef struct _GEOMETRY
  25 {
  26         ULONG   Cylinders;
  27         ULONG   Heads;
  28         ULONG   Sectors;
  29         ULONG   BytesPerSector;
  30
  31 } GEOMETRY, *PGEOMETRY;
  32
  33 //
  34 // Define the structure of a partition table entry
  35 //
  36 typedef struct _PARTITION_TABLE_ENTRY
  37 {
  38         BYTE    BootIndicator;                                  // 0x00 - non-bootable partition, 0x80 - bootable partition (one partition only)
  39         BYTE    StartHead;                                              // Beginning head number
  40         BYTE    StartSector;                                    // Beginning sector (2 high bits of cylinder #)
  41         BYTE    StartCylinder;                                  // Beginning cylinder# (low order bits of cylinder #)
  42         BYTE    SystemIndicator;                                // System indicator
  43         BYTE    EndHead;                                                // Ending head number
  44         BYTE    EndSector;                                              // Ending sector (2 high bits of cylinder #)
  45         BYTE    EndCylinder;                                    // Ending cylinder# (low order bits of cylinder #)
  46         DWORD   SectorCountBeforePartition;             // Number of sectors preceding the partition
  47         DWORD   PartitionSectorCount;                   // Number of sectors in the partition
  48
  49 } PACKED PARTITION_TABLE_ENTRY, *PPARTITION_TABLE_ENTRY;
  50
  51 //
  52 // Define the structure of the master boot record
  53 //
  54 typedef struct _MASTER_BOOT_RECORD
  55 {
  56         BYTE                                    MasterBootRecordCodeAndData[0x1be];
  57         PARTITION_TABLE_ENTRY   PartitionTable[4];
  58         WORD                                    MasterBootRecordMagic;
  59
  60 } PACKED MASTER_BOOT_RECORD, *PMASTER_BOOT_RECORD;
  61
  62 //
  63 // Partition type defines
  64 //
  65 #define PARTITION_ENTRY_UNUSED          0x00      // Entry unused
  66 #define PARTITION_FAT_12                0x01      // 12-bit FAT entries
  67 #define PARTITION_XENIX_1               0x02      // Xenix
  68 #define PARTITION_XENIX_2               0x03      // Xenix
  69 #define PARTITION_FAT_16                0x04      // 16-bit FAT entries
  70 #define PARTITION_EXTENDED              0x05      // Extended partition entry
  71 #define PARTITION_HUGE                  0x06      // Huge partition MS-DOS V4
  72 #define PARTITION_IFS                   0x07      // IFS Partition
  73 #define PARTITION_OS2BOOTMGR            0x0A      // OS/2 Boot Manager/OPUS/Coherent swap
  74 #define PARTITION_FAT32                 0x0B      // FAT32
  75 #define PARTITION_FAT32_XINT13          0x0C      // FAT32 using extended int13 services
  76 #define PARTITION_XINT13                0x0E      // Win95 partition using extended int13 services
  77 #define PARTITION_XINT13_EXTENDED       0x0F      // Same as type 5 but uses extended int13 services
  78 #define PARTITION_PREP                  0x41      // PowerPC Reference Platform (PReP) Boot Partition
  79 #define PARTITION_LDM                   0x42      // Logical Disk Manager partition
  80 #define PARTITION_UNIX                  0x63      // Unix
  81
  82 ///////////////////////////////////////////////////////////////////////////////////////
  83 //
  84 // BIOS Disk Functions
  85 //
  86 ///////////////////////////////////////////////////////////////////////////////////////
  87 int             biosdisk(int cmd, int drive, int head, int track, int sector, int nsects, void *buffer); // Implemented in asmcode.S
  88
  89 BOOL    BiosInt13Read(ULONG Drive, ULONG Head, ULONG Track, ULONG Sector, ULONG SectorCount, PVOID Buffer); // Implemented in asmcode.S
  90 BOOL    BiosInt13ReadExtended(ULONG Drive, ULONG Sector, ULONG SectorCount, PVOID Buffer); // Implemented in asmcode.S
  91 BOOL    BiosInt13ExtensionsSupported(ULONG Drive);
  92 ULONG   BiosInt13GetLastErrorCode(VOID);
  93
  94 void    stop_floppy(void);                      // Implemented in asmcode.S
  95 int             get_heads(int drive);           // Implemented in asmcode.S
  96 int             get_cylinders(int drive);       // Implemented in asmcode.S
  97 int             get_sectors(int drive);         // Implemented in asmcode.S
  98 BOOL    BiosInt13GetDriveParameters(ULONG Drive, PGEOMETRY Geometry);   // Implemented in disk.S
  99
 100 ///////////////////////////////////////////////////////////////////////////////////////
 101 //
 102 // FreeLoader Disk Functions
 103 //
 104 ///////////////////////////////////////////////////////////////////////////////////////
 105 VOID    DiskError(PUCHAR ErrorString);
 106 BOOL    DiskGetDriveGeometry(ULONG DriveNumber, PGEOMETRY DriveGeometry);
 107 BOOL    DiskReadLogicalSectors(ULONG DriveNumber, ULONG SectorNumber, ULONG SectorCount, PVOID Buffer);
 108
 109 ///////////////////////////////////////////////////////////////////////////////////////
 110 //
 111 // Fixed Disk Partition Management Functions
 112 //
 113 ///////////////////////////////////////////////////////////////////////////////////////
 114 BOOL    DiskIsDriveRemovable(ULONG DriveNumber);
 115 BOOL    DiskGetActivePartitionEntry(ULONG DriveNumber, PPARTITION_TABLE_ENTRY PartitionTableEntry);
 116 BOOL    DiskGetPartitionEntry(ULONG DriveNumber, ULONG PartitionNumber, PPARTITION_TABLE_ENTRY PartitionTableEntry);
 117 BOOL    DiskGetFirstPartitionEntry(PMASTER_BOOT_RECORD MasterBootRecord, PPARTITION_TABLE_ENTRY PartitionTableEntry);
 118 BOOL    DiskGetFirstExtendedPartitionEntry(PMASTER_BOOT_RECORD MasterBootRecord, PPARTITION_TABLE_ENTRY PartitionTableEntry);
 119 BOOL    DiskReadBootRecord(ULONG DriveNumber, ULONG LogicalSectorNumber, PMASTER_BOOT_RECORD BootRecord);
 120
 121 #endif  // defined __DISK_H