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mihaipmihaip
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Allow an arbitrary number of partitions to work with a single disk device
Uses the MetaImgFile approach from joevt/dingusppc@c0773fe and mihaip/dingusppc@51019e4 to use a single disk device to open multiple images (specified via colon separators)
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‎src/system/osapi/js/AppleDiskPartitions.h‎

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/*
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File: AppleDiskPartitions.h
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Contains: The Apple disk partition scheme as defined in Inside Macintosh: Volume V.
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Version: Technology: Mac OS 9
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Release: Universal Interfaces 3.4.2
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Copyright: © 2000-2002 by Apple Computer, Inc., all rights reserved
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Bugs?: For bug reports, consult the following page on
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the World Wide Web:
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http://developer.apple.com/bugreporter/
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*/
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#ifndef __APPLEDISKPARTITIONS__
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#define __APPLEDISKPARTITIONS__
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#include "HFSVolumes.h"
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#include <cinttypes>
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#pragma pack(push, 1)
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/* Block 0 Definitions */
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enum {
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sbSIGWord = 0x4552, /* signature word for Block 0 ('ER') */
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sbMac = 1 /* system type for Mac */
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};
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/* Partition Map Signatures */
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enum {
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pMapSIG = 0x504D, /* partition map signature ('PM') */
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pdSigWord = 0x5453, /* partition map signature ('TS') */
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oldPMSigWord = pdSigWord,
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newPMSigWord = pMapSIG
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};
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/* Driver Descriptor Map */
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struct Block0 {
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uint16_t sbSig; /* 00 unique value for SCSI block 0 */
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uint16_t sbBlkSize; /* 02 block size of device */
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uint32_t sbBlkCount; /* 04 number of blocks on device */
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uint16_t sbDevType; /* 08 device type */
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uint16_t sbDevId; /* 0A device id */
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uint32_t sbData; /* 0C not used */
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uint16_t sbDrvrCount; /* 10 driver descriptor count */
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uint32_t ddBlock; /* 12 1st driver's starting block */
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uint16_t ddSize; /* 16 size of 1st driver (512-byte blks) */
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uint16_t ddType; /* 18 system type (1 for Mac+) */
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uint16_t ddPad[243]; /* 1A ARRAY[0..242] OF INTEGER; not used */
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};
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typedef struct Block0 Block0;
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static_assert(sizeof(Block0) == 0x200);
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/* Driver descriptor */
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struct DDMap {
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uint32_t ddBlock; /* 1st driver's starting block */
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uint16_t ddSize; /* size of 1st driver (512-byte blks) */
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uint16_t ddType; /* system type (1 for Mac+) */
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};
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typedef struct DDMap DDMap;
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/* Constants for the ddType field of the DDMap structure. */
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enum {
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kDriverTypeMacSCSI = 0x0001,
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kDriverTypeMacATA = 0x0701,
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kDriverTypeMacSCSIChained = 0xFFFF,
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kDriverTypeMacATAChained = 0xF8FF
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};
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/* Partition Map Entry */
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struct Partition {
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uint16_t pmSig; /* 0 unique value for map entry blk */
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uint16_t pmSigPad; /* 2 currently unused */
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uint32_t pmMapBlkCnt; /* 4 # of blks in partition map */
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uint32_t pmPyPartStart; /* 8 physical start blk of partition */
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uint32_t pmPartBlkCnt; /* C # of blks in this partition */
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uint8_t pmPartName[32]; /* 0x10 ASCII partition name */
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uint8_t pmParType[32]; /* 0x30 ASCII partition type */
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uint32_t pmLgDataStart; /* 0x50 log. # of partition's 1st data blk */
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uint32_t pmDataCnt; /* 0x54 # of blks in partition's data area */
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uint32_t pmPartStatus; /* 0x58 bit field for partition status */
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uint32_t pmLgBootStart; /* 0x5C log. blk of partition's boot code */
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uint32_t pmBootSize; /* 0x60 number of bytes in boot code */
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uint32_t pmBootAddr; /* 0x64 memory load address of boot code */
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uint32_t pmBootAddr2; /* 0x68 currently unused */
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uint32_t pmBootEntry; /* 0x6C entry point of boot code */
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uint32_t pmBootEntry2; /* 0x70 currently unused */
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uint32_t pmBootCksum; /* 0x74 checksum of boot code */
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uint8_t pmProcessor[16]; /* 0x78 ASCII for the processor type */
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uint16_t pmPad[188]; /* 0x88 ARRAY[0..187] OF INTEGER; not used */
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}; /* 0x200 */
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typedef struct Partition Partition;
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/* Flags for the pmPartStatus field of the Partition data structure. */
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enum {
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kPartitionAUXIsValid = 0x00000001,
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kPartitionAUXIsAllocated = 0x00000002,
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kPartitionAUXIsInUse = 0x00000004,
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kPartitionAUXIsBootValid = 0x00000008,
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kPartitionAUXIsReadable = 0x00000010,
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kPartitionAUXIsWriteable = 0x00000020,
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kPartitionAUXIsBootCodePositionIndependent = 0x00000040,
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kPartitionIsWriteable = 0x00000020,
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kPartitionIsMountedAtStartup = 0x40000000,
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kPartitionIsStartup = (long)0x80000000,
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kPartitionIsChainCompatible = 0x00000100,
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kPartitionIsRealDeviceDriver = 0x00000200,
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kPartitionCanChainToNext = 0x00000400
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};
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/* Well known driver signatures, stored in the first four byte of pmPad. */
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enum {
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kPatchDriverSignature = FOUR_CHAR_CODE('ptDR'), /* SCSI and ATA[PI] patch driver */
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kSCSIDriverSignature = 0x00010600, /* SCSI hard disk driver */
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kATADriverSignature = FOUR_CHAR_CODE('wiki'), /* ATA hard disk driver */
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kSCSICDDriverSignature = FOUR_CHAR_CODE('CDvr'), /* SCSI CD-ROM driver */
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kATAPIDriverSignature = FOUR_CHAR_CODE('ATPI'), /* ATAPI CD-ROM driver */
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kDriveSetupHFSSignature = FOUR_CHAR_CODE('DSU1') /* Drive Setup HFS partition */
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};
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#pragma pack(pop)
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#endif /* __APPLEDISKPARTITIONS__ */

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