about Plx9054 DMA

  
   我写WDM下的PLX9054 驱动，我不知如何做到:

  sets up the address of initial descriptor block in the pci 9054 Descriptor Pointer registers.

  This address is physical address? but how  i can get it?
I know it may be use MmGetPhysicalAddress in NT.

  Pls help me!

     Thanks.