Writing Windows WDM Device Drivers

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#pragma code_seg() // end PAGE section

Listing 4.9 Pnp.cpp

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//Copyright © 1998 Chris Cant, PHD Computer Consultants Ltd
//WDM Book for R&D Books, Miller Freeman Inc
//
//Wdm1 example
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//pnp.cpp:Plug and Play and Power IRP handlers
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//Wdm1AddDeviceAdd device routine
//Wdm1PnpPNP IRP dispatcher
//Wdm1PowerPOWER IRP dispatcher
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//Version history //27-Apr-991.0.0CCcreation
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#define INITGUID// initialize WDM1_GUID in this module
#include 'wdm1.h'
#pragma code_seg('PAGE')// start PAGE section
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//Wdm1AddDevice:
//
//Description:
//Cope with a new Pnp device being added here.
//Usually just attach to the top of the driver stack.
//Do not talk to device here!
//
//Arguments:
//Pointer to the Driver object
//Pointer to Physical Device Object
//
//Return Value:
//This function returns STATUS_XXX
NTSTATUS WdmlAddDevice(IN PDRIVER_OBJECT DriverObject, IN PDEVICE_OBJECT pdo) {
 DebugPrint('AddDevice');
 NTSTATUS status;
 PDEVICE_OBJECT fdo;
 // Create our Functional Device Object in fdo
 status = IoCreateDevice(DriverObject, sizeof(WDM1_DEVICE_EXTENSION),
  NULL,// No Name
  FILE_DEVICE_UNKNOWN, 0,
  FALSE,// Not exclusive
  &fdo);
 if (!NT_SUCCESS(status)) return status;
 // Remember fdo in our device extension
 PWDM1_DEVICE_EXTENSION dx = (PWDM1_DEVICE_EXTENSION)fdo->DeviceExtension;
 dx->fdo = fdo;
 DebugPrint('FDO is %x',fdo);
 // Register and enable our device interface
 status = IoRegisterDeviceInterface(pdo, &WDM1_GUID, NULL, &dx->ifSymLinkName);
 if (!NT_SUCCESS(status)) {
  IoDeleteDevice(fdo);
  return status;
 }
 IoSetDeviceInterfaceState(&dx->ifSymLinkName, TRUE);
 DebugPrint('Symbolic Link Name is %T', &dx->ifSymLinkName);
 // Attach to the driver stack below us
 dx->NextStackDevice = IoAttachDeviceToDeviceStack(fdo.pdo);
 // Set fdo flags appropriately
 fdo->Flags &= ~DO_DEVICE_INITIALIZING;
 fdo->Flags |= DO_BUFFERED_IO;
 return STATUS_SUCCESS;
}
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//Wdm1Pnp:
//
//Description:
//Handle IRP_MJ_PNP requests
//
//Arguments:
//Pointer to our FDO
//Pointer to the IRP
//Various minor codes
//IrpStack->Parameters.QueryDeviceRelations
//IrpStack->Parameters.QueryInterface
//IrpStack->Parameters.DeviceCapabilities
//IrpStack->Parameters.FilterResourceRequirements
//IrpStack->Parameters.ReadWriteConfig
//IrpStack->Parameters.SetLock
//IrpStack->Parameters.QueryId
//IrpStack->Parameters.QueryDeviceText
//IrpStack->Parameters.UsageNotification
//
//Return Value:
//This function returns STATUS_XXX
NTSTATUS Wdm1Pnp(IN PDEVICE_OBJECT fdo, IN PIRP Irp) {
 DebugPrint('PnP %I', Irp);