Write Dext code for my existing Kext

Hi,I am trying to write Dext code for my existing Kext,How to convert this code to be compatible with Dext?

BufferMemoryDescriptorAME_Module = NULL;
IOMemoryMap *MemMap;

BufferMemoryDescriptorAME_Module= IOBufferMemoryDescriptor::inTaskWithPhysicalMask(kernel_task,kIOMemoryPhysicallyContiguous,otal_memory_size);

BufferMemoryDescriptorAME_Module->prepare(kIODirectionInOut);

MemMap = BufferMemoryDescriptorAME_Module->map(kIOMapInhibitCache);

logicalAddressAME_Module = (UInt8 *) MemMap->getVirtualAddress();

physicalAddressAME_Module = MemMap->getPhysicalAddress();

Thanks, Frederic

Write Dext code for my existing Kext
 
 
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