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[USB-BRINGUP]

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- Move attributes / device description to common struct
- Partly implement IRP_MJ_CREATE, IRP_MJ_CLOSE, IRP_MJ_READ

svn path=/branches/usb-bringup/; revision=54798
This commit is contained in:
Johannes Anderwald 2011-12-31 19:09:26 +00:00
parent eb5e8a089b
commit f687f32e69
4 changed files with 465 additions and 56 deletions
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6
drivers/hid/hidclass/fdo.c
View file

@ -268,7 +268,7 @@ HidClassFDO_GetDescriptors(
//
IoStack->Parameters.DeviceIoControl.IoControlCode = IOCTL_HID_GET_DEVICE_ATTRIBUTES;
IoStack->Parameters.DeviceIoControl.OutputBufferLength = sizeof(HID_DEVICE_ATTRIBUTES);
Irp->UserBuffer = &FDODeviceExtension->Attributes;
Irp->UserBuffer = &FDODeviceExtension->Common.Attributes;
//
// send request
@ -357,7 +357,7 @@ HidClassFDO_StartDevice(
//
// lets start the lower device too
//
IoCopyCurrentIrpStackLocationToNext(Irp);
IoSkipCurrentIrpStackLocation(Irp);
Status = HidClassFDO_DispatchRequestSynchronous(DeviceObject, Irp);
ASSERT(Status == STATUS_SUCCESS);
@ -370,7 +370,7 @@ HidClassFDO_StartDevice(
//
// now get the the collection description
//
Status = HidP_GetCollectionDescription(FDODeviceExtension->ReportDescriptor, FDODeviceExtension->HidDescriptor.DescriptorList[0].wReportLength, NonPagedPool, &FDODeviceExtension->DeviceDescription);
Status = HidP_GetCollectionDescription(FDODeviceExtension->ReportDescriptor, FDODeviceExtension->HidDescriptor.DescriptorList[0].wReportLength, NonPagedPool, &FDODeviceExtension->Common.DeviceDescription);
ASSERT(Status == STATUS_SUCCESS);
//

414
drivers/hid/hidclass/hidclass.c
View file

@ -126,11 +126,80 @@ HidClass_Create(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp)
{
UNIMPLEMENTED
ASSERT(FALSE);
Irp->IoStatus.Status = STATUS_NOT_IMPLEMENTED;
PIO_STACK_LOCATION IoStack;
PHIDCLASS_COMMON_DEVICE_EXTENSION CommonDeviceExtension;
PHIDCLASS_PDO_DEVICE_EXTENSION PDODeviceExtension;
PHIDCLASS_FILEOP_CONTEXT Context;
//
// get device extension
//
CommonDeviceExtension = (PHIDCLASS_COMMON_DEVICE_EXTENSION)DeviceObject->DeviceExtension;
if (CommonDeviceExtension->IsFDO)
{
//
// only supported for PDO
//
DPRINT1("[HIDCLASS] IRP_MJ_CREATE for FDO\n");
Irp->IoStatus.Status = STATUS_UNSUCCESSFUL;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return STATUS_UNSUCCESSFUL;
}
//
// must be a PDO
//
ASSERT(CommonDeviceExtension->IsFDO == FALSE);
//
// get device extension
//
PDODeviceExtension = (PHIDCLASS_PDO_DEVICE_EXTENSION)CommonDeviceExtension;
//
// get stack location
//
IoStack = IoGetCurrentIrpStackLocation(Irp);
DPRINT1("ShareAccess %x\n", IoStack->Parameters.Create.ShareAccess);
DPRINT1("Options %x\n", IoStack->Parameters.Create.Options);
DPRINT1("DesiredAccess %x\n", IoStack->Parameters.Create.SecurityContext->DesiredAccess);
//
// allocate context
//
Context = (PHIDCLASS_FILEOP_CONTEXT)ExAllocatePool(NonPagedPool, sizeof(HIDCLASS_FILEOP_CONTEXT));
if (!Context)
{
//
// no memory
//
Irp->IoStatus.Status = STATUS_INSUFFICIENT_RESOURCES;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return STATUS_INSUFFICIENT_RESOURCES;
}
//
// init context
//
RtlZeroMemory(Context, sizeof(HIDCLASS_FILEOP_CONTEXT));
Context->DeviceExtension = PDODeviceExtension;
KeInitializeSpinLock(&Context->Lock);
InitializeListHead(&Context->ReadPendingIrpListHead);
InitializeListHead(&Context->IrpCompletedListHead);
//
// store context
//
ASSERT(IoStack->FileObject);
IoStack->FileObject->FsContext = (PVOID)Context;
//
// done
//
Irp->IoStatus.Status = STATUS_SUCCESS;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return STATUS_NOT_IMPLEMENTED;
return STATUS_SUCCESS;
}
NTSTATUS
@ -139,24 +208,327 @@ HidClass_Close(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp)
{
PIO_STACK_LOCATION IoStack;
PHIDCLASS_COMMON_DEVICE_EXTENSION CommonDeviceExtension;
PHIDCLASS_IRP_CONTEXT IrpContext;
//
// get device extension
//
CommonDeviceExtension = (PHIDCLASS_COMMON_DEVICE_EXTENSION)DeviceObject->DeviceExtension;
//
// is it a FDO request
//
if (CommonDeviceExtension->IsFDO)
{
//
// how did the request get there
//
Irp->IoStatus.Status = STATUS_INVALID_PARAMETER_1;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return STATUS_INVALID_PARAMETER_1;
}
//
// get stack location
//
IoStack = IoGetCurrentIrpStackLocation(Irp);
//
// sanity checks
//
ASSERT(IoStack->FileObject);
ASSERT(IoStack->FileObject->FsContext);
//
// get irp context
//
IrpContext = (PHIDCLASS_IRP_CONTEXT)IoStack->FileObject->FsContext;
//
// cancel pending irps
//
UNIMPLEMENTED
ASSERT(FALSE);
Irp->IoStatus.Status = STATUS_NOT_IMPLEMENTED;
//
// remove context
//
IoStack->FileObject->FsContext = NULL;
//
// free context
//
ExFreePool(IrpContext);
//
// complete request
//
Irp->IoStatus.Status = STATUS_SUCCESS;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return STATUS_NOT_IMPLEMENTED;
return STATUS_SUCCESS;
}
NTSTATUS
NTAPI
HidClass_ReadCompleteIrp(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp,
IN PVOID Ctx)
{
PHIDCLASS_IRP_CONTEXT IrpContext;
KIRQL OldLevel;
//
// get irp context
//
IrpContext = (PHIDCLASS_IRP_CONTEXT)Ctx;
DPRINT1("HidClass_ReadCompleteIrp Irql %lu\n", KeGetCurrentIrql());
DPRINT1("HidClass_ReadCompleteIrp Status %lx\n", Irp->IoStatus.Status);
DPRINT1("HidClass_ReadCompleteIrp Length %lu\n", Irp->IoStatus.Information);
DPRINT1("HidClass_ReadCompleteIrp Irp %p\n", Irp);
DPRINT1("HidClass_ReadCompleteIrp InputReportBuffer %p\n", IrpContext->InputReportBuffer);
DPRINT1("HidClass_ReadCompleteIrp InputReportBufferLength %li\n", IrpContext->InputReportBufferLength);
DPRINT1("HidClass_ReadCompleteIrp OriginalIrp %p\n", IrpContext->OriginalIrp);
//
// copy result
//
if (Irp->IoStatus.Information)
{
//
// copy result
//
RtlCopyMemory(IrpContext->OriginalIrp->UserBuffer, IrpContext->InputReportBuffer, IrpContext->InputReportBufferLength);
}
//
// copy result status
//
IrpContext->OriginalIrp->IoStatus.Status = Irp->IoStatus.Status;
Irp->IoStatus.Information = Irp->IoStatus.Information;
//
// free input report buffer
//
ExFreePool(IrpContext->InputReportBuffer);
//
// complete original request
//
IoCompleteRequest(IrpContext->OriginalIrp, IO_NO_INCREMENT);
//
// remove us from pending list
//
KeAcquireSpinLock(&IrpContext->FileOp->Lock, &OldLevel);
//
// remove from pending list
//
RemoveEntryList(&Irp->Tail.Overlay.ListEntry);
//
// release lock
//
KeReleaseSpinLock(&IrpContext->FileOp->Lock, OldLevel);
//
// free irp context
//
ExFreePool(IrpContext);
//
// done
//
return STATUS_SUCCESS;
}
NTSTATUS
HidClass_BuildIrp(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP RequestIrp,
IN PHIDCLASS_FILEOP_CONTEXT Context,
IN ULONG DeviceIoControlCode,
IN ULONG BufferLength,
OUT PIRP *OutIrp,
OUT PHIDCLASS_IRP_CONTEXT *OutIrpContext)
{
PIRP Irp;
PIO_STACK_LOCATION IoStack;
PHIDCLASS_IRP_CONTEXT IrpContext;
//
// build new irp
//
Irp = IoAllocateIrp(DeviceObject->StackSize, FALSE);
if (!Irp)
{
//
// no memory
//
return STATUS_INSUFFICIENT_RESOURCES;
}
//
// allocate completion context
//
IrpContext = (PHIDCLASS_IRP_CONTEXT)ExAllocatePool(NonPagedPool, sizeof(HIDCLASS_IRP_CONTEXT));
if (!IrpContext)
{
//
// no memory
//
IoFreeIrp(Irp);
return STATUS_INSUFFICIENT_RESOURCES;
}
//
// init irp context
//
RtlZeroMemory(IrpContext, sizeof(HIDCLASS_IRP_CONTEXT));
IrpContext->InputReportBufferLength = BufferLength;
IrpContext->OriginalIrp = RequestIrp;
IrpContext->FileOp = Context;
//
// allocate buffer
//
IrpContext->InputReportBuffer = ExAllocatePool(NonPagedPool, BufferLength);
if (!IrpContext->InputReportBuffer)
{
//
// no memory
//
IoFreeIrp(Irp);
ExFreePool(IrpContext);
return STATUS_INSUFFICIENT_RESOURCES;
}
//
// get stack location
//
IoStack = IoGetNextIrpStackLocation(Irp);
//
// init stack location
//
IoStack->MajorFunction = IRP_MJ_INTERNAL_DEVICE_CONTROL;
IoStack->Parameters.DeviceIoControl.IoControlCode = DeviceIoControlCode;
IoStack->Parameters.DeviceIoControl.OutputBufferLength = IrpContext->InputReportBufferLength;
IoStack->Parameters.DeviceIoControl.InputBufferLength = 0;
IoStack->Parameters.DeviceIoControl.Type3InputBuffer = NULL;
Irp->UserBuffer = IrpContext->InputReportBuffer;
IoStack->DeviceObject = DeviceObject;
//
// store result
//
*OutIrp = Irp;
*OutIrpContext = IrpContext;
DPRINT1("IRP %p Buffer %p\n", Irp, Irp->UserBuffer);
//
// done
//
return STATUS_SUCCESS;
}
NTSTATUS
NTAPI
HidClass_Read(
IN PDEVICE_OBJECT DeviceObject,
IN PIRP Irp)
{
UNIMPLEMENTED
ASSERT(FALSE);
Irp->IoStatus.Status = STATUS_NOT_IMPLEMENTED;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return STATUS_NOT_IMPLEMENTED;
PIO_STACK_LOCATION IoStack;
PHIDCLASS_FILEOP_CONTEXT Context;
KIRQL OldLevel;
NTSTATUS Status;
PIRP NewIrp;
PHIDCLASS_IRP_CONTEXT NewIrpContext;
//
// get current stack location
//
IoStack = IoGetCurrentIrpStackLocation(Irp);
//
// sanity check
//
ASSERT(IoStack->FileObject);
ASSERT(IoStack->FileObject->FsContext);
//
// get context
//
Context = (PHIDCLASS_FILEOP_CONTEXT)IoStack->FileObject->FsContext;
ASSERT(Context);
//
// FIXME support polled devices
//
ASSERT(Context->DeviceExtension->Common.DriverExtension->DevicesArePolled == FALSE);
DPRINT1("[HIDCLASS] IRP_MJ_READ\n");
//
// build irp request
//
Status = HidClass_BuildIrp(DeviceObject, Irp, Context, IOCTL_HID_READ_REPORT, IoStack->Parameters.DeviceIoControl.OutputBufferLength, &NewIrp, &NewIrpContext);
if (!NT_SUCCESS(Status))
{
//
// failed
//
DPRINT1("HidClass_BuildIrp failed with %x\n", Status);
Irp->IoStatus.Status = Status;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return Status;
}
//
// acquire lock
//
KeAcquireSpinLock(&Context->Lock, &OldLevel);
//
// insert irp into pending list
//
InsertTailList(&Context->ReadPendingIrpListHead, &NewIrp->Tail.Overlay.ListEntry);
//
// set completion routine
//
IoSetCompletionRoutine(NewIrp, HidClass_ReadCompleteIrp, NewIrpContext, TRUE, TRUE, TRUE);
//
// make next location current
//
IoSetNextIrpStackLocation(NewIrp);
//
// release spin lock
//
KeReleaseSpinLock(&Context->Lock, OldLevel);
//
// mark irp pending
//
IoMarkIrpPending(Irp);
//
// lets dispatch the request
//
ASSERT(Context->DeviceExtension);
Status = Context->DeviceExtension->Common.DriverExtension->MajorFunction[IRP_MJ_INTERNAL_DEVICE_CONTROL](DeviceObject, NewIrp);
//
// complete
//
return Status;
}
NTSTATUS
@ -181,14 +553,11 @@ HidClass_DeviceControl(
PIO_STACK_LOCATION IoStack;
PHIDCLASS_COMMON_DEVICE_EXTENSION CommonDeviceExtension;
PHID_COLLECTION_INFORMATION CollectionInformation;
PHIDCLASS_PDO_DEVICE_EXTENSION PDODeviceExtension;
//
// get device extension
//
CommonDeviceExtension = (PHIDCLASS_COMMON_DEVICE_EXTENSION)DeviceObject->DeviceExtension;
ASSERT(CommonDeviceExtension->IsFDO == FALSE);
PDODeviceExtension = (PHIDCLASS_PDO_DEVICE_EXTENSION)CommonDeviceExtension;
//
// get stack location
@ -221,11 +590,11 @@ HidClass_DeviceControl(
//
// init result buffer
//
CollectionInformation->DescriptorSize = PDODeviceExtension->DeviceDescription.CollectionDesc[0].PreparsedDataLength; //FIXME which collection is to be retrieved for composite devices / multi collection devices?
CollectionInformation->DescriptorSize = CommonDeviceExtension->DeviceDescription.CollectionDesc[0].PreparsedDataLength; //FIXME which collection is to be retrieved for composite devices / multi collection devices?
CollectionInformation->Polled = CommonDeviceExtension->DriverExtension->DevicesArePolled;
CollectionInformation->VendorID = PDODeviceExtension->Attributes.VendorID;
CollectionInformation->ProductID = PDODeviceExtension->Attributes.ProductID;
CollectionInformation->VersionNumber = PDODeviceExtension->Attributes.VersionNumber;
CollectionInformation->VendorID = CommonDeviceExtension->Attributes.VendorID;
CollectionInformation->ProductID = CommonDeviceExtension->Attributes.ProductID;
CollectionInformation->VersionNumber = CommonDeviceExtension->Attributes.VersionNumber;
//
// complete request
@ -244,7 +613,7 @@ HidClass_DeviceControl(
//
// check if output buffer is big enough
//
if (IoStack->Parameters.DeviceIoControl.OutputBufferLength < PDODeviceExtension->DeviceDescription.CollectionDesc[0].PreparsedDataLength)
if (IoStack->Parameters.DeviceIoControl.OutputBufferLength < CommonDeviceExtension->DeviceDescription.CollectionDesc[0].PreparsedDataLength)
{
//
// invalid buffer size
@ -258,12 +627,12 @@ HidClass_DeviceControl(
// copy result
//
ASSERT(Irp->UserBuffer);
RtlCopyMemory(Irp->UserBuffer, PDODeviceExtension->DeviceDescription.CollectionDesc[0].PreparsedData, PDODeviceExtension->DeviceDescription.CollectionDesc[0].PreparsedDataLength);
RtlCopyMemory(Irp->UserBuffer, CommonDeviceExtension->DeviceDescription.CollectionDesc[0].PreparsedData, CommonDeviceExtension->DeviceDescription.CollectionDesc[0].PreparsedDataLength);
//
// complete request
//
Irp->IoStatus.Information = PDODeviceExtension->DeviceDescription.CollectionDesc[0].PreparsedDataLength;
Irp->IoStatus.Information = CommonDeviceExtension->DeviceDescription.CollectionDesc[0].PreparsedDataLength;
Irp->IoStatus.Status = STATUS_SUCCESS;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return STATUS_SUCCESS;
@ -271,7 +640,6 @@ HidClass_DeviceControl(
default:
{
DPRINT1("[HIDCLASS] DeviceControl IoControlCode 0x%x not implemented\n", IoStack->Parameters.DeviceIoControl.IoControlCode);
ASSERT(FALSE);
Irp->IoStatus.Status = STATUS_NOT_IMPLEMENTED;
IoCompleteRequest(Irp, IO_NO_INCREMENT);
return STATUS_NOT_IMPLEMENTED;

16
drivers/hid/hidclass/pdo.c
View file

@ -120,12 +120,12 @@ HidClassPDO_HandleQueryHardwareId(
//
// store hardware ids
//
Offset = swprintf(&Buffer[Offset], L"HID\\Vid_%04x&Pid_%04x&Rev_%04x", PDODeviceExtension->Attributes.VendorID, PDODeviceExtension->Attributes.ProductID, PDODeviceExtension->Attributes.VersionNumber) + 1;
Offset += swprintf(&Buffer[Offset], L"HID\\Vid_%04x&Pid_%04x", PDODeviceExtension->Attributes.VendorID, PDODeviceExtension->Attributes.ProductID) + 1;
Offset = swprintf(&Buffer[Offset], L"HID\\Vid_%04x&Pid_%04x&Rev_%04x", PDODeviceExtension->Common.Attributes.VendorID, PDODeviceExtension->Common.Attributes.ProductID, PDODeviceExtension->Common.Attributes.VersionNumber) + 1;
Offset += swprintf(&Buffer[Offset], L"HID\\Vid_%04x&Pid_%04x", PDODeviceExtension->Common.Attributes.VendorID, PDODeviceExtension->Common.Attributes.ProductID) + 1;
if (PDODeviceExtension->DeviceDescription.CollectionDesc[PDODeviceExtension->CollectionIndex].UsagePage == HID_USAGE_PAGE_GENERIC)
if (PDODeviceExtension->Common.DeviceDescription.CollectionDesc[PDODeviceExtension->CollectionIndex].UsagePage == HID_USAGE_PAGE_GENERIC)
{
switch(PDODeviceExtension->DeviceDescription.CollectionDesc[PDODeviceExtension->CollectionIndex].Usage)
switch(PDODeviceExtension->Common.DeviceDescription.CollectionDesc[PDODeviceExtension->CollectionIndex].Usage)
{
case HID_USAGE_GENERIC_POINTER:
case HID_USAGE_GENERIC_MOUSE:
@ -156,7 +156,7 @@ HidClassPDO_HandleQueryHardwareId(
break;
}
}
else if (PDODeviceExtension->DeviceDescription.CollectionDesc[PDODeviceExtension->CollectionIndex].UsagePage == HID_USAGE_PAGE_CONSUMER && PDODeviceExtension->DeviceDescription.CollectionDesc[PDODeviceExtension->CollectionIndex].Usage == HID_USAGE_CONSUMERCTRL)
else if (PDODeviceExtension->Common.DeviceDescription.CollectionDesc[PDODeviceExtension->CollectionIndex].UsagePage == HID_USAGE_PAGE_CONSUMER && PDODeviceExtension->Common.DeviceDescription.CollectionDesc[PDODeviceExtension->CollectionIndex].Usage == HID_USAGE_CONSUMERCTRL)
{
//
// Consumer Audio Control
@ -545,15 +545,15 @@ HidClassPDO_CreatePDO(
PDODeviceExtension->Common.HidDeviceExtension.PhysicalDeviceObject = FDODeviceExtension->Common.HidDeviceExtension.PhysicalDeviceObject;
PDODeviceExtension->Common.IsFDO = FALSE;
PDODeviceExtension->Common.DriverExtension = FDODeviceExtension->Common.DriverExtension;
RtlCopyMemory(&PDODeviceExtension->Attributes, &FDODeviceExtension->Attributes, sizeof(HID_DEVICE_ATTRIBUTES));
RtlCopyMemory(&PDODeviceExtension->DeviceDescription, &FDODeviceExtension->DeviceDescription, sizeof(HIDP_DEVICE_DESC));
RtlCopyMemory(&PDODeviceExtension->Common.Attributes, &FDODeviceExtension->Common.Attributes, sizeof(HID_DEVICE_ATTRIBUTES));
RtlCopyMemory(&PDODeviceExtension->Common.DeviceDescription, &FDODeviceExtension->Common.DeviceDescription, sizeof(HIDP_DEVICE_DESC));
RtlCopyMemory(&PDODeviceExtension->Capabilities, &FDODeviceExtension->Capabilities, sizeof(DEVICE_CAPABILITIES));
//
// FIXME: support composite devices
//
PDODeviceExtension->CollectionIndex = 0;
ASSERT(PDODeviceExtension->DeviceDescription.CollectionDescLength == 1);
ASSERT(PDODeviceExtension->Common.DeviceDescription.CollectionDescLength == 1);
//
// store in device relations struct

85
drivers/hid/hidclass/precomp.h
View file

@ -9,8 +9,6 @@
#include <wdmguid.h>
#include <debug.h>
typedef struct
{
PDRIVER_OBJECT DriverObject;
@ -40,6 +38,17 @@ typedef struct
//
PHIDCLASS_DRIVER_EXTENSION DriverExtension;
//
// device description
//
HIDP_DEVICE_DESC DeviceDescription;
//
// hid attributes
//
HID_DEVICE_ATTRIBUTES Attributes;
}HIDCLASS_COMMON_DEVICE_EXTENSION, *PHIDCLASS_COMMON_DEVICE_EXTENSION;
typedef struct
@ -59,21 +68,11 @@ typedef struct
//
HID_DESCRIPTOR HidDescriptor;
//
// hid attributes
//
HID_DEVICE_ATTRIBUTES Attributes;
//
// report descriptor
//
PUCHAR ReportDescriptor;
//
// device description
//
HIDP_DEVICE_DESC DeviceDescription;
//
// device relations
//
@ -88,21 +87,11 @@ typedef struct
//
HIDCLASS_COMMON_DEVICE_EXTENSION Common;
//
// device descriptor
//
HID_DEVICE_ATTRIBUTES Attributes;
//
// device capabilities
//
DEVICE_CAPABILITIES Capabilities;
//
// device description
//
HIDP_DEVICE_DESC DeviceDescription;
//
// collection index
//
@ -114,6 +103,58 @@ typedef struct
UNICODE_STRING DeviceInterface;
}HIDCLASS_PDO_DEVICE_EXTENSION, *PHIDCLASS_PDO_DEVICE_EXTENSION;
typedef struct __HIDCLASS_FILEOP_CONTEXT__
{
//
// device extension
//
PHIDCLASS_PDO_DEVICE_EXTENSION DeviceExtension;
//
// spin lock
//
KSPIN_LOCK Lock;
//
// read irp pending list
//
LIST_ENTRY ReadPendingIrpListHead;
//
// completed irp list
//
LIST_ENTRY IrpCompletedListHead;
}HIDCLASS_FILEOP_CONTEXT, *PHIDCLASS_FILEOP_CONTEXT;
typedef struct
{
//
// original request
//
PIRP OriginalIrp;
//
// file op
//
PHIDCLASS_FILEOP_CONTEXT FileOp;
//
// buffer for reading report
//
PVOID InputReportBuffer;
//
// buffer length
//
ULONG InputReportBufferLength;
//
// work item
//
PIO_WORKITEM CompletionWorkItem;
}HIDCLASS_IRP_CONTEXT, *PHIDCLASS_IRP_CONTEXT;
/* fdo.c */
NTSTATUS