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104 lines
3.6 KiB
104 lines
3.6 KiB
/*++
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Copyright (c) 1999 Microsoft Corporation
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Module Name:
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layout.hxx
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Abstract:
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This contains definitions and constants for the efiformat utility.
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Revision History:
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--*/
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#ifndef __LAYOUT__
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#define __LAYOUT__
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#include "efiwintypes.hxx"
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//
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// types and defines for format
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//
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#define FAT_TYPE_ILLEGAL 0
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#define FAT_TYPE_F12 1
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#define FAT_TYPE_F16 2
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#define FAT_TYPE_F32 3
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typedef struct _PART_DESCRIPTOR {
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ULONGLONG SectorCount; // number of sectors in the partition
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UINT32 SectorSize; // bytes per sector, one of 512, 1024, 2048, 4096
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UINT32 HeaderCount; // sectors before 1st fat (total), NOT counting FATs
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UINT32 FatEntrySize; // 4 or 2, this code isn't for FAT12
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UINT32 MinClusterCount; // Minimum allowed clusters - count, NOT index
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UINT32 MaxClusterCount; // Maximum allowed clusters - count, NOT index
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// MinClusterCount <= ClusterCount <= MaxClusterCount
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UINT32 SectorsPerCluster; // 1 to 128
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UINT32 FatSectorCount; // Size of ONE Fat table IN SECTORS
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UINT32 FatType; // one of
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} PART_DESCRIPTOR, *PPART_DESCRIPTOR;
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//
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// All FAT constants
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//
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#define MAX_CLUSTER_BYTES (32*1024)
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//
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// FAT32 Constants
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//
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#define MIN_CLUSTER_F32 65525
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#define SAFE_MIN_CLUSTER_F32 (MIN_CLUSTER_F32 + 16)
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#define SMALLEST_FAT32_BYTES SAFE_MIN_CLUSTER_F32 * 4
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#define HEADER_F32 33 // 1 boot, 32 free reserved
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#define MAX_CLUSTER_F32 (0xfffffff-1) // max 28 bit number, -2 (first used index),
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// +1 it's an inclusive count.
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// max of 0xffffffe named 2 to 0xfffffff
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#define FATS_F32 2 // number of FATS
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//
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// FAT16 Constants
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//
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#define MIN_CLUSTER_F16 4085
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#define SAFE_MIN_CLUSTER_F16 (MIN_CLUSTER_F16 + 16)
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#define SMALLEST_FAT16_BYTES SAFE_MIN_CLUSTER_F16 * 2
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#define HEADER_F16 1 // boot sector only
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#define MAX_CLUSTER_F16 65524
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#define FATS_F16 2 // number of FATS
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// prototypes
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// layout choice functions
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// found in layout.c
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BOOLEAN // TRUE if success, FALSE if failure
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ChooseLayout(
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PPART_DESCRIPTOR PartDes // Pointer to characteristic description of partition
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);
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UINT32 // Min. # of sectors for Fat32 part. for given sector size
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MinSectorsFat32(
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UINT32 SectorSize // The Sector size in question
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);
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UINT32 // Min. # of sectors for Fat16 part. for given sector size
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MinSectorsFat16(
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UINT32 SectorSize // Sector size to compute for
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);
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BOOLEAN // TRUE for success, FALSE for failure
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PickClusterSize(
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PPART_DESCRIPTOR PartDes, // characteristics of part. at hand
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PUINT32 ReturnedSectorsPerCluster, // RETURNED = number of sectors per cluster
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PUINT32 ReturnedFatSize // RETURNED = number of sectors for FAT
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);
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BOOLEAN // FALSE if ERROR, TRUE if SUCCESS
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ComputeFatSize(
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PPART_DESCRIPTOR PartDes, // partition characteristics to compute for
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UINT32 SectorsPerCluster, // number of sectors per cluster
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PUINT32 ReturnedFatSectorCount // RETURN Number of FAT sectors in each fat
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);
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#endif //__LAYOUT__
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