#ifdef __cplusplus
extern "C"
{
#endif
#include <wdm.h>
#include <ntddser.h>
#ifdef __cplusplus
}
#endif 
#define COMBUFLEN 50000
typedef struct _DEVICE_EXTENSION
{
	PDEVICE_OBJECT fdo;
	PDEVICE_OBJECT NextStackDevice;
	UNICODE_STRING ustrDeviceName;	// 設(shè)備名
	UNICODE_STRING ustrSymLinkName;	// 符號(hào)鏈接名

	KSPIN_LOCK IoctlSpinLock;
	KSPIN_LOCK WriteSpinLock;

	ULONG EventMask;
	ULONG HistoryEvents;

	ULONG BaudRate;
	ULONG RTSstate;
	ULONG DTRstate;

	SERIAL_TIMEOUTS Timeouts;
	SERIAL_LINE_CONTROL Lc;

	CHAR Buffer[COMBUFLEN];

	struct _SERIAL_DEVICE_EXTENSION* pOther;

    PIRP pWaitIrp;
    PIRP pReadIrp;

	int IsOpen;
	ULONG uReadWrite;
} DEVICE_EXTENSION, *PDEVICE_EXTENSION;

#define PAGEDCODE code_seg("PAGE")
#define LOCKEDCODE code_seg()
#define INITCODE code_seg("INIT")

#define PAGEDDATA data_seg("PAGE")
#define LOCKEDDATA data_seg()
#define INITDATA data_seg("INIT")

#define arraysize(p) (sizeof(p)/sizeof((p)[0]))

NTSTATUS HelloWDMAddDevice(IN PDRIVER_OBJECT DriverObject,
                           IN PDEVICE_OBJECT PhysicalDeviceObject);
NTSTATUS HelloWDMPnp(IN PDEVICE_OBJECT fdo,
                        IN PIRP Irp);
NTSTATUS HelloWDMDispatchRoutine(IN PDEVICE_OBJECT fdo,
								 IN PIRP Irp);
NTSTATUS HelloWDMDispatchControlp(IN PDEVICE_OBJECT fdo,
								 IN PIRP Irp);
NTSTATUS HelloWDMCreate(IN PDEVICE_OBJECT fdo,
                        IN PIRP Irp);
void HelloWDMUnload(IN PDRIVER_OBJECT DriverObject);

extern "C"
NTSTATUS DriverEntry(IN PDRIVER_OBJECT DriverObject,
                     IN PUNICODE_STRING RegistryPath);
NTSTATUS HelloWDMClose(IN PDEVICE_OBJECT fdo,
                        IN PIRP Irp);

NTSTATUS HelloWDMRead(IN PDEVICE_OBJECT fdo,
                        IN PIRP Irp);
NTSTATUS HelloWDMWrite(IN PDEVICE_OBJECT fdo,
                        IN PIRP Irp);