www.pudn.com > Windows 2000设备驱动程序设计指南 .zip > Driver.h

// Driver.h - Chapter 12 
// 
// Copyright (C) 2000 by Jerry Lozano 
// 
 
#pragma once 
 
extern "C" { 
#include  
} 
#include "Unicode.h" 
 
enum DRIVER_STATE {Stopped, Started, Removed}; 
 
typedef struct _DEVICE_EXTENSION { 
	PDEVICE_OBJECT pDevice; 
	PDEVICE_OBJECT pLowerDevice; 
	ULONG DeviceNumber; 
	CUString ustrDeviceName;	// internal name 
	CUString ustrSymLinkName;	// external name 
 
	PUCHAR portBase;				// I/O register address 
	ULONG  portLength; 
	KIRQL IRQL;					// Irq for parallel port 
	ULONG Vector; 
	KAFFINITY Affinity; 
	PKINTERRUPT pIntObj;	// the interrupt object 
	BOOLEAN bInterruptExpected;	// TRUE iff this driver is expecting interrupt 
	DRIVER_STATE state;		// current state of driver 
 
	PDMA_ADAPTER pDmaAdapter; 
	ULONG mapRegisterCount; 
	ULONG dmaChannel; 
 
	// This is the "handle" assigned to the map registers 
	// when the AdapterControl routine is called back 
	PVOID mapRegisterBase; 
 
	ULONG bytesRequested; 
	ULONG bytesRemaining; 
	ULONG transferSize; 
	PUCHAR transferVA; 
 
	// This flag is TRUE if writing, FALSE if reading 
	BOOLEAN bWriting; 
 
} DEVICE_EXTENSION, *PDEVICE_EXTENSION; 
 
#define MAX_DMA_LENGTH (4096 * 4) 
 
#define DEVICE_FAIL( pDevExt ) FALSE