Storage Requirements for AdapterControl Routines

If it has an AdapterControl routine, a driver must provide resident storage for the following:

  • Context information to be used in its DMA operations

  • An adapter object pointer returned by IoGetDmaAdapter

  • A ULONG-type variable to hold the system-determined maximum NumberOfMapRegisters available for any given DMA transfer request

The driver can provide the necessary storage in a device extension, in a controller extension, or in nonpaged pool allocated by the driver.



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