reactos/drivers/dd/ide/partitio.h

   1 /**
   2 *** Partition.h - defines and structs for harddrive partition info
   3 ***
   4 ***  05/30/98  RJJ  Created
   5 **/
   6
   7 #ifndef __PARTITION_H
   8 #define __PARTITION_H
   9
  10 #define  PARTITION_MAGIC    0xaa55
  11 #define  PART_MAGIC_OFFSET  0x01fe
  12 #define  PARTITION_OFFSET   0x01be
  13 #define  PARTITION_TBL_SIZE 4
  14 #define  PTCHSToLBA(c, h, s, scnt, hcnt) ((s) & 0x3f) + \
  15     (scnt) * ( (h) + (hcnt) * ((c) | (((s) & 0xc0) << 2)))
  16 #define  PTLBAToCHS(lba, c, h, s, scnt, hcnt) ( \
  17     (s) = (lba) % (scnt) + 1,  \
  18     (lba) /= (scnt), \
  19     (h) = (lba) % (hcnt), \
  20     (lba) /= (heads), \
  21     (c) = (lba) & 0xff, \
  22     (s) |= ((lba) >> 2) & 0xc0)
  23
  24
  25 typedef enum PartitionTypes {
  26   PTEmpty = 0,
  27   PTDOS3xPrimary = 1,
  28   PT_OLDDOS16Bit = 4,
  29   PTDosExtended = 5,
  30   PTDos5xPrimary = 6
  31 } PARTITIONTYPES;
  32
  33 #define PartitionIsSupported(P) ((P)->PartitionType == PTDOS3xPrimary || \
  34     (P)->PartitionType == PT_OLDDOS16Bit || (P)->PartitionType == PTDos5xPrimary)
  35
  36 typedef struct Partition {
  37   __u8   BootFlags;
  38   __u8   StartingHead;
  39   __u8   StartingSector;
  40   __u8   StartingCylinder;
  41   __u8   PartitionType;
  42   __u8   EndingHead;
  43   __u8   EndingSector;
  44   __u8   EndingCylinder;
  45   unsigned int  StartingBlock;
  46   unsigned int  SectorCount;
  47
  48 } PARTITION;
  49
  50 #endif  // PARTITION_H
  51
  52