Windows ce 6.0 3g modem driver

A monolithic driver is one that does not separate the source code inthis fashion. However, this does make the drivermore difficult to maintain and less portable to future versions ofWindows CE. The device type or device model code is theoretically thesame regardless of the underlying hardware.

For example all serial drivers will need to process receive andtransmit buffers and handle flow control logic. These operations areindependent of the hardware and should be isolated into a MDD modulefor code reuse. Because the MDD module is at the topmost layer of thedriver it exposes the stream interface to the Device Manager.

Someexamples of tasks performed by the MDD module are:. Contain code that iscommon to all drivers of a given type. Call PDD functions to accessthe hardware. Other parts ofthe OS can call these functions. Related devices can share the sameDDI.

Monolithic drivers also expose the DDI functions. Handle interrupt processing. Provide for reuse bydevelopers. Can link to multiple PDDs.

Generally require nochanges. If changed, you might have trouble migrating drivers tofuture versions. Contain any interruptservice threads ISTs. Consist of hardwareplatform specific code. Might require modificationfor your hardware platform.

Are designed to work withspecific MDD implementations. Monolithic drivers do not expose the DDSIfunctions. If multiple types of serial ports exist on ahardware platform, you can either create several different serialdrivers, one for each serial port type, or create several differentlower layers PDD and link them to a single upper layer MDD.

Thiscreates one multipurpose serial driver. Creating separate drivers cansimplify debugging and maintenance because each driver supports onlyone type of port. Creating a multipurpose driver, such as the sampleserial port driver, is more complex but gives a small memory savings.

Because the functionality of serial ports maps to the functionalityprovided by standard stream interface functions, the serial port driveruses the stream interface as its device interface. Because the MDD is designed to support the most common subset offunctions that audio devices require there is bound to be functionalityon more complex audio devices that is not covered.

Instead of forcingdevelopers to modify the MDD in that situation the unified audio modelwas created. A driver that conforms to the UAM is a structuredmonolithic driver.

The UAM gives the developer complete control overthe audio device but in a structured manner. Figure 2a and 2b belowillustrate the subtle differences in the two driver models.

This makes portingnetwork device drivers from the desktop to Windows CE verystraightforward. NDIS performs a set of external functions for network adapterdrivers, such as registering and intercepting hardware interrupts andcommunicating with underlying network adapters.

This high levelof structure makes NDIS drivers very portable. The only thing constant is change Windows CE 6. These drivers run in theuser space of memory and it is very difficult for these drivers tocrash the system. The traditional kernel-mode drivers share the samememory space as the kernel and other drivers and could potentiallyoverwrite the memory of other processes and crash the system. The new virtualmemory architecture hassignificant implications for device drivers.

Previous versions of theOS used special processes to add functionality to the base kernel. Forexample, one process managed loadable device drivers, another managedregistry and file systems, another managed the windowing system,another managed system services, and so forth. In Windows CE 6 Beta,many system services execute in the context of the kernel. Thisimproves the performance of intra-kernel calls that, in previousreleases, required multiple traps into the kernel.

In Windows CE 6Beta, devicedrivers need to be aware of any process that passes them pointers tomemory buffers. In previous versions, each process had a unique virtualaddress space, so this was not a significant consideration. In WindowsCE 6 Beta, a particular user-mode address might be valid in multipleprocesses. Changes to drivers are documented in detail in the Help.

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