64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
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// mbr.h - minimum stuff to allow diskpart to work on MBRs.
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//
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//
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// MBR:
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// There are 3 kinds of MBRs.
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// 1. GPT Shadow MBR - an MBR filled in with particular values
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// to keep legacy software from puking on GPT disks.
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// 2. MBR base - an MBR that allows for up to 4 paritions.
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// 3. Extended MBR - nested inside other MBRs to allow more than
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// 4 partitions on a non-GPT disk.
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//
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// This program, and therefore this header file, is only concerned
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// with case 1, and a limited subset of case 2.
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//
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//
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// MBR contains code, with a table of 4 Partition entries and
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// a signature at the end.
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//
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#pragma pack (1)
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typedef struct _MBR_ENTRY {
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CHAR8 ActiveFlag; // Bootable or not
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CHAR8 StartingTrack; // Not used
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CHAR8 StartingCylinderLsb; // Not used
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CHAR8 StartingCylinderMsb; // Not used
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CHAR8 PartitionType; // 12 bit FAT, 16 bit FAT etc.
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CHAR8 EndingTrack; // Not used
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CHAR8 EndingCylinderLsb; // Not used
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CHAR8 EndingCylinderMsb; // Not used
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UINT32 StartingSector; // Hidden sectors
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UINT32 PartitionLength; // Sectors in this partition
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} MBR_ENTRY;
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//
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// Number of partition table entries
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//
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#define NUM_PARTITION_TABLE_ENTRIES 4
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//
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// Partition table record and boot signature offsets in bytes
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//
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#define MBR_TABLE_OFFSET (0x1be)
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#define MBR_SIGNATURE_OFFSET (0x200 - 2)
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//
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// Boot record signature value.
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//
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#define BOOT_RECORD_SIGNATURE (0xaa55)
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//
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// Special Partition type used only on GPT disks
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//
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#define PARTITION_TYPE_GPT_SHADOW (0xEE)
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#pragma pack ()
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