New PDF release: 8080 8085 Assembly Language Programming

By Intel Corporation

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The Registry String takes the form HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\ DriverName. What a DriverEntry Routine Does Although the exact details vary based on whether a driver is WDM or kernel-mode, in general the following steps are taken in a DriverEntry routine. 1. DriverEntry locates hardware that it will be controlling. That hardware is allocated—it is marked as under the control of this driver. 2. The driver object is initialized by announcing other driver entry points. The announcements are accomplished by storing function pointers directly into the driver object.

The only exception occurs for read-only data. Otherwise, the attempt by one thread of execution to store into the global variable interferes with another thread's attempt to read or write the same data. Of course, local static variables in a driver function are just as bad. State for a driver must be kept elsewhere, such as in a device extension as just described. Working with the Kernel Stack On the x86 platform, the kernel stack is only 12 KB in size. On other platforms, the stack size is 16 KB.

Execution Context The I/O Manager calls a Shutdown routine during a system shutdown. 5, the Shutdown routine runs at PASSIVE_LEVEL IRQL, which means it has access to paged system resources. 5. Function Prototype for Shutdown Routine NTSTATUS Shutdown Parameter IN PRDRIVE_OBJECT pDriverObject IN PIRP pIrp Return value IRQL == PASSIVE_LEVEL Description Pointer to driver object for this driver Pointer to shutdown IRP • STATUS_SUCCESS -or• STATUS_XXX - some error code What a Shutdown Routine Does The main purpose of the Shutdown routine is to put the device into a quiescent state and perhaps store some device information into the system Registry.

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8080 8085 Assembly Language Programming by Intel Corporation

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