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13.3.3 Local media LDD
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Figure 13.7 shows the main classes that comprise the local media LDD. The diagram also includes the TBusLocalDrive class and the main NAND media driver class to show the relationships between the local media LDD and these other components. I will now describe these classes.
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13.3.3.1 The DLocalDrive class
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The class DLocalDrive is the local drive logical channel abstraction. An instance of this class is created each time a TBusLocalDrive object is connected to a local drive, and destroyed each time it is disconnected. If two channels are connected to the same drive, then two instances of this class will exist. DLocalDrive is derived from the abstract base class for a logical channel, DLogicalChannelBase. In this case, however,
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TBusLocalDrive 1 user kernel 1 DLocalDrive n iDrive Local Media LDD 1 TLocDrv iPartitionNumber : TInt n DMedia 1 iPartitionInfo TPartitionInfo iDriver iDfcQ iMsgQ iCurrentReq TLocDrvRequest DPrimaryMediaBase 1 iMedia
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1 DMediaDriver
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iQueue TDfcQue TMessageQue
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DNandMediaDriver NAND Media Driver
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Figure 13.7 Class diagram for the local media LDD
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MEDIA DRIVERS AND THE LOCAL MEDIA SUB-SYSTEM
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the fact that it derives from this rather than DLogicalChannel does not imply that requests on the channel are always executed in the context of the client thread. Media drivers can also be con gured to perform requests in a kernel thread as we will see shortly. The DLocalDrive class contains the member iDrive, a pointer to an associated TLocDrv object.
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13.3.3.2 The TLocDrv class
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TLocDrv encapsulates the local drive itself and, unlike the DLocalDrive class, there is always just a single instance of this class per local drive. When a driver or extension registers for a set of local drives (normally during kernel boot), a TLocDrv instance is created for each. Since it is not possible to de-register drives, these objects are never destroyed. Each TLocDrv instance represents an individual partition on a media device, so if a media device contains multiple partitions, then a separate TLocDrv object is required for each one. The TLocDrv class contains the member iMedia, a pointer to its associated DMedia object.
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13.3.3.3 The DMedia class
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The DMedia class is the abstraction for a media device. It owns a single media driver, iDriver, which it uses to perform any access to the media hardware. It also owns a TPartitionInfo object, iPartitionInfo, which holds information on each of the partitions contained on the media. Here is the class de nition:
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class TPartitionEntry { public: // Start address of partition, described as the relative //offset in bytes, from the start of the media. Int64 iPartitionBaseAddr; // The length of the partition, in bytes. Int64 iPartitionLen; // Boot Indicator record, currently unused. TUint16 iBootIndicator; // Describes the type of partition. TUint16 iPartitionType; }; const TInt KMaxPartitionEntries=0x4; class TPartitionInfo { public: TPartitionInfo();
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public: Int64 iMediaSizeInBytes; //Total size of media in bytes. TInt iPartitionCount; //No of partitions on media. TPartitionEntry iEntry[KMaxPartitionEntries]; };
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The TLocDrv class contains a partition number, iPartitionNumber. This indicates the element of the partition array in the associated DMedia object, TPartitionInfo::iEntry[], which holds the data for that partition. Local drive requests are speci ed in terms of an offset relative to the start of the partition. By retrieving partition information from the appropriate DMedia object, the request is converted into an absolute address on the media device and then passed on to the media driver. When a driver or extension registers for a set of local drives, it must also specify the number of associated DMedia objects required. Hence, drive registration is also the point at which the DMedia objects are allocated and again, they are never destroyed. A peripheral bus controller must specify at least one separate media object for each card slot that it controls. Some peripheral bus controllers may need to register for more than one media object per card slot if they are required to support dual media cards. For example, a single SD card, containing both a user and a protected area, requires separate media drivers for both areas, and so needs at least two DMedia objects available. As far as Symbian OS is concerned, this is effectively a dual function, or dual media card. Where removable media are concerned, the relationship between TLocDrv and DMedia objects can change as the user of the phone removes one memory card and inserts another. The SD card con guration that I ve just described requires two DMedia objects, with each having a single associated TLocDrv object. If this card were removed and replaced by a MultiMediaCard containing two partitions, then this would require only one DMedia object, with two associated TLocDrv objects. Figure 13.8 shows various TLocDrv and DMedia combinations that could result from different cards being inserted into a single card slot.
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