2 * ReactOS Floppy Driver
3 * Copyright (C) 2004, Vizzini (vizzini@plasmic.com)
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 * PROJECT: ReactOS Floppy Driver
21 * PURPOSE: Main floppy driver routines
22 * PROGRAMMER: Vizzini (vizzini@plasmic.com)
24 * 15-Feb-2004 vizzini - Created
26 * - This driver is only designed to work with ISA-bus floppy controllers. This
27 * won't work on PCI-based controllers or on anything else with level-sensitive
28 * interrupts without modification. I don't think these controllers exist.
30 * ---- General to-do items ----
31 * TODO: Figure out why CreateClose isn't called any more. Seems to correspond
32 * with the driver not being unloadable.
33 * TODO: Think about StopDpcQueued -- could be a race; too tired atm to tell
34 * TODO: Clean up drive start/stop responsibilities (currently a mess...)
36 * ---- Support for proper media detection ----
37 * TODO: Handle MFM flag
38 * TODO: Un-hardcode the data rate from various places
39 * TODO: Proper media detection (right now we're hardcoded to 1.44)
40 * TODO: Media detection based on sector 1
49 #include "readwrite.h"
52 * Global controller info structures. Each controller gets one. Since the system
53 * will probably have only one, with four being a very unlikely maximum, a static
54 * global array is easiest to deal with.
56 static CONTROLLER_INFO gControllerInfo
[MAX_CONTROLLERS
];
57 static ULONG gNumberOfControllers
= 0;
59 /* Queue thread management */
60 static KEVENT QueueThreadTerminate
;
61 static PVOID QueueThreadObject
;
65 MotorStopDpcFunc(PKDPC UnusedDpc
, PVOID DeferredContext
, PVOID SystemArgument1
, PVOID SystemArgument2
)
67 * FUNCTION: Stop the floppy motor
69 * UnusedDpc: DPC object that's going off
70 * DeferredContext: called with DRIVE_INFO for drive to turn off
71 * SystemArgument1: unused
72 * SystemArgument2: unused
74 * - Must set an event to let other threads know we're done turning off the motor
75 * - Called back at DISPATCH_LEVEL
78 PCONTROLLER_INFO ControllerInfo
= (PCONTROLLER_INFO
)DeferredContext
;
80 UNREFERENCED_PARAMETER(SystemArgument1
);
81 UNREFERENCED_PARAMETER(SystemArgument2
);
82 UNREFERENCED_PARAMETER(UnusedDpc
);
84 ASSERT(KeGetCurrentIrql() == DISPATCH_LEVEL
);
85 ASSERT(ControllerInfo
);
87 TRACE_(FLOPPY
, "MotorStopDpcFunc called\n");
89 HwTurnOffMotor(ControllerInfo
);
90 ControllerInfo
->StopDpcQueued
= FALSE
;
91 KeSetEvent(&ControllerInfo
->MotorStoppedEvent
, EVENT_INCREMENT
, FALSE
);
96 StartMotor(PDRIVE_INFO DriveInfo
)
98 * FUNCTION: Start the motor, taking into account proper handling of the timer race
100 * DriveInfo: drive to start
102 * - Never call HwTurnOnMotor() directly
103 * - This protocol manages a race between the cancel timer and the requesting thread.
104 * You wouldn't want to turn on the motor and then cancel the timer, because the
105 * cancel dpc might fire in the meantime, and that'd un-do what you just did. If you
106 * cancel the timer first, but KeCancelTimer returns false, the dpc is already running,
107 * so you have to wait until the dpc is completly done running, or else you'll race
108 * with the turner-offer
109 * - PAGED_CODE because we wait
115 TRACE_(FLOPPY
, "StartMotor called\n");
117 if(DriveInfo
->ControllerInfo
->StopDpcQueued
&& !KeCancelTimer(&DriveInfo
->ControllerInfo
->MotorTimer
))
119 /* Motor turner-offer is already running; wait for it to finish */
120 INFO_(FLOPPY
, "StartMotor: motor turner-offer is already running; waiting for it\n");
121 KeWaitForSingleObject(&DriveInfo
->ControllerInfo
->MotorStoppedEvent
, Executive
, KernelMode
, FALSE
, NULL
);
122 INFO_(FLOPPY
, "StartMotor: wait satisfied\n");
125 DriveInfo
->ControllerInfo
->StopDpcQueued
= FALSE
;
127 if(HwTurnOnMotor(DriveInfo
) != STATUS_SUCCESS
)
129 WARN_(FLOPPY
, "StartMotor(): warning: HwTurnOnMotor failed\n");
135 StopMotor(PCONTROLLER_INFO ControllerInfo
)
137 * FUNCTION: Stop all motors on the controller
139 * DriveInfo: Drive to stop
141 * - Never call HwTurnOffMotor() directly
142 * - This manages the timer cancelation race (see StartMotor for details).
143 * All we have to do is set up a timer.
146 LARGE_INTEGER StopTime
;
148 ASSERT(ControllerInfo
);
150 TRACE_(FLOPPY
, "StopMotor called\n");
152 /* one relative second, in 100-ns units */
153 StopTime
.QuadPart
= 10000000;
154 StopTime
.QuadPart
*= -1;
156 KeClearEvent(&ControllerInfo
->MotorStoppedEvent
);
157 KeSetTimer(&ControllerInfo
->MotorTimer
, StopTime
, &ControllerInfo
->MotorStopDpc
);
158 ControllerInfo
->StopDpcQueued
= TRUE
;
163 WaitForControllerInterrupt(PCONTROLLER_INFO ControllerInfo
)
165 * FUNCTION: Wait for the controller to interrupt, and then clear the event
167 * ControllerInfo: Controller to wait for
169 * - There is a small chance that an unexpected or spurious interrupt could
170 * be lost with this clear/wait/clear scheme used in this driver. This is
171 * deemed to be an acceptable risk due to the unlikeliness of the scenario,
172 * and the fact that it'll probably work fine next time.
173 * - PAGED_CODE because it waits
177 ASSERT(ControllerInfo
);
179 KeWaitForSingleObject(&ControllerInfo
->SynchEvent
, Executive
, KernelMode
, FALSE
, NULL
);
180 KeClearEvent(&ControllerInfo
->SynchEvent
);
183 static DRIVER_DISPATCH CreateClose
;
184 static NTSTATUS NTAPI
CreateClose(PDEVICE_OBJECT DeviceObject
,
187 * FUNCTION: Dispatch function called for Create and Close IRPs
189 * DeviceObject: DeviceObject that is the target of the IRP
190 * Irp: IRP to process
192 * STATUS_SUCCESS in all cases
194 * - The Microsoft sample drivers tend to return FILE_OPENED in Information, so I do too.
195 * - No reason to fail the device open
196 * - No state to track, so this routine is easy
197 * - Can be called <= DISPATCH_LEVEL
199 * TODO: Figure out why this isn't getting called
202 UNREFERENCED_PARAMETER(DeviceObject
);
204 TRACE_(FLOPPY
, "CreateClose called\n");
206 Irp
->IoStatus
.Status
= STATUS_SUCCESS
;
207 Irp
->IoStatus
.Information
= FILE_OPENED
;
209 IoCompleteRequest(Irp
, IO_DISK_INCREMENT
);
211 return STATUS_SUCCESS
;
215 static NTSTATUS NTAPI
216 Recalibrate(PDRIVE_INFO DriveInfo
)
218 * FUNCTION: Start the recalibration process
220 * DriveInfo: Pointer to the driveinfo struct associated with the targeted drive
222 * STATUS_SUCCESS on successful starting of the process
223 * STATUS_IO_DEVICE_ERROR if it fails
225 * - Sometimes you have to do two recalibrations, particularly if the disk has <80 tracks.
226 * - PAGED_CODE because we wait
235 /* first turn on the motor */
236 /* Must stop after every start, prior to return */
237 StartMotor(DriveInfo
);
239 /* set the data rate */
240 WARN_(FLOPPY
, "FIXME: UN-HARDCODE DATA RATE\n");
241 if(HwSetDataRate(DriveInfo
->ControllerInfo
, 0) != STATUS_SUCCESS
)
243 WARN_(FLOPPY
, "Recalibrate: HwSetDataRate failed\n");
244 StopMotor(DriveInfo
->ControllerInfo
);
245 return STATUS_IO_DEVICE_ERROR
;
248 /* clear the event just in case the last call forgot */
249 KeClearEvent(&DriveInfo
->ControllerInfo
->SynchEvent
);
251 /* sometimes you have to do this twice; we'll just do it twice all the time since
252 * we don't know if the people calling this Recalibrate routine expect a disk to
253 * even be in the drive, and if so, if that disk is formatted.
255 for(i
= 0; i
< 2; i
++)
257 /* Send the command */
258 Status
= HwRecalibrate(DriveInfo
);
259 if(Status
!= STATUS_SUCCESS
)
261 WARN_(FLOPPY
, "Recalibrate: HwRecalibrate returned error\n");
265 WaitForControllerInterrupt(DriveInfo
->ControllerInfo
);
267 /* Get the results */
268 Status
= HwRecalibrateResult(DriveInfo
->ControllerInfo
);
269 if(Status
!= STATUS_SUCCESS
)
271 WARN_(FLOPPY
, "Recalibrate: HwRecalibrateResult returned error\n");
276 KeClearEvent(&DriveInfo
->ControllerInfo
->SynchEvent
);
278 /* Must stop after every start, prior to return */
279 StopMotor(DriveInfo
->ControllerInfo
);
286 ResetChangeFlag(PDRIVE_INFO DriveInfo
)
288 * FUNCTION: Reset the drive's change flag (as reflected in the DIR)
290 * DriveInfo: the drive to reset
292 * STATUS_SUCCESS if the changeline is cleared
293 * STATUS_NO_MEDIA_IN_DEVICE if the changeline cannot be cleared
294 * STATUS_IO_DEVICE_ERROR if the controller cannot be communicated with
296 * - Change reset procedure: recalibrate, seek 1, seek 0
297 * - If the line is still set after that, there's clearly no disk in the
298 * drive, so we return STATUS_NO_MEDIA_IN_DEVICE
299 * - PAGED_CODE because we wait
307 TRACE_(FLOPPY
, "ResetChangeFlag called\n");
309 /* Try to recalibrate. We don't care if it works. */
310 Recalibrate(DriveInfo
);
312 /* clear spurious interrupts in prep for seeks */
313 KeClearEvent(&DriveInfo
->ControllerInfo
->SynchEvent
);
315 /* must re-start the drive because Recalibrate() stops it */
316 StartMotor(DriveInfo
);
319 if(HwSeek(DriveInfo
, 1) != STATUS_SUCCESS
)
321 WARN_(FLOPPY
, "ResetChangeFlag(): HwSeek failed; returning STATUS_IO_DEVICE_ERROR\n");
322 StopMotor(DriveInfo
->ControllerInfo
);
323 return STATUS_IO_DEVICE_ERROR
;
326 WaitForControllerInterrupt(DriveInfo
->ControllerInfo
);
328 if(HwSenseInterruptStatus(DriveInfo
->ControllerInfo
) != STATUS_SUCCESS
)
330 WARN_(FLOPPY
, "ResetChangeFlag(): HwSenseInterruptStatus failed; bailing out\n");
331 StopMotor(DriveInfo
->ControllerInfo
);
332 return STATUS_IO_DEVICE_ERROR
;
336 if(HwSeek(DriveInfo
, 0) != STATUS_SUCCESS
)
338 WARN_(FLOPPY
, "ResetChangeFlag(): HwSeek failed; returning STATUS_IO_DEVICE_ERROR\n");
339 StopMotor(DriveInfo
->ControllerInfo
);
340 return STATUS_IO_DEVICE_ERROR
;
343 WaitForControllerInterrupt(DriveInfo
->ControllerInfo
);
345 if(HwSenseInterruptStatus(DriveInfo
->ControllerInfo
) != STATUS_SUCCESS
)
347 WARN_(FLOPPY
, "ResetChangeFlag(): HwSenseInterruptStatus #2 failed; bailing\n");
348 StopMotor(DriveInfo
->ControllerInfo
);
349 return STATUS_IO_DEVICE_ERROR
;
352 /* Check the change bit */
353 if(HwDiskChanged(DriveInfo
, &DiskChanged
) != STATUS_SUCCESS
)
355 WARN_(FLOPPY
, "ResetChangeFlag(): HwDiskChanged failed; returning STATUS_IO_DEVICE_ERROR\n");
356 StopMotor(DriveInfo
->ControllerInfo
);
357 return STATUS_IO_DEVICE_ERROR
;
360 StopMotor(DriveInfo
->ControllerInfo
);
362 /* if the change flag is still set, there's probably no media in the drive. */
364 return STATUS_NO_MEDIA_IN_DEVICE
;
366 /* else we're done! */
367 return STATUS_SUCCESS
;
372 Unload(PDRIVER_OBJECT DriverObject
)
374 * FUNCTION: Unload the driver from memory
376 * DriverObject - The driver that is being unloaded
382 UNREFERENCED_PARAMETER(DriverObject
);
384 TRACE_(FLOPPY
, "unloading\n");
386 KeSetEvent(&QueueThreadTerminate
, 0, FALSE
);
387 KeWaitForSingleObject(QueueThreadObject
, Executive
, KernelMode
, FALSE
, 0);
388 ObDereferenceObject(QueueThreadObject
);
390 for(i
= 0; i
< gNumberOfControllers
; i
++)
392 if(!gControllerInfo
[i
].Initialized
)
395 for(j
= 0; j
< gControllerInfo
[i
].NumberOfDrives
; j
++)
397 if(!gControllerInfo
[i
].DriveInfo
[j
].Initialized
)
400 if(gControllerInfo
[i
].DriveInfo
[j
].DeviceObject
)
404 RtlInitUnicodeString(&Link
, gControllerInfo
[i
].DriveInfo
[j
].SymLinkBuffer
);
405 IoDeleteSymbolicLink(&Link
);
407 RtlInitUnicodeString(&Link
, gControllerInfo
[i
].DriveInfo
[j
].ArcPathBuffer
);
408 IoDeassignArcName(&Link
);
410 IoDeleteDevice(gControllerInfo
[i
].DriveInfo
[j
].DeviceObject
);
414 IoDisconnectInterrupt(gControllerInfo
[i
].InterruptObject
);
416 /* Power down the controller */
417 if(HwPowerOff(&gControllerInfo
[i
]) != STATUS_SUCCESS
)
419 WARN_(FLOPPY
, "unload: warning: HwPowerOff failed\n");
425 static NTSTATUS NTAPI
426 ConfigCallback(PVOID Context
,
427 PUNICODE_STRING PathName
,
428 INTERFACE_TYPE BusType
,
430 PKEY_VALUE_FULL_INFORMATION
*BusInformation
,
431 CONFIGURATION_TYPE ControllerType
,
432 ULONG ControllerNumber
,
433 PKEY_VALUE_FULL_INFORMATION
*ControllerInformation
,
434 CONFIGURATION_TYPE PeripheralType
,
435 ULONG PeripheralNumber
,
436 PKEY_VALUE_FULL_INFORMATION
*PeripheralInformation
)
438 * FUNCTION: Callback to IoQueryDeviceDescription, which tells us about our controllers
442 * BusType: Type of the bus that our controller is on
443 * BusNumber: Number of the bus that our controller is on
444 * BusInformation: Unused
445 * ControllerType: Unused
446 * ControllerNumber: Number of the controller that we're adding
447 * ControllerInformation: Full configuration information for our controller
448 * PeripheralType: Unused
449 * PeripheralNumber: Unused
450 * PeripheralInformation: Full configuration information for each drive on our controller
452 * STATUS_SUCCESS in all cases
454 * - The only documentation I've found about the contents of these structures is
455 * from the various Microsoft floppy samples and from the DDK headers. They're
456 * very vague, though, so I'm only mostly sure that this stuff is correct, as
457 * the MS samples do things completely differently than I have done them. Seems
458 * to work in my VMWare, though.
459 * - Basically, the function gets all of the information (port, dma, irq) about the
460 * controller, and then loops through all of the drives presented in PeripheralInformation.
461 * - Each controller has a CONTROLLER_INFO created for it, and each drive has a DRIVE_INFO.
462 * - Device objects are created for each drive (not controller), as that's the targeted
463 * device in the eyes of the rest of the OS. Each DRIVE_INFO points to a single CONTROLLER_INFO.
464 * - We only support up to four controllers in the whole system, each of which supports up to four
468 PKEY_VALUE_FULL_INFORMATION ControllerFullDescriptor
= ControllerInformation
[IoQueryDeviceConfigurationData
];
469 PCM_FULL_RESOURCE_DESCRIPTOR ControllerResourceDescriptor
= (PCM_FULL_RESOURCE_DESCRIPTOR
)((PCHAR
)ControllerFullDescriptor
+
470 ControllerFullDescriptor
->DataOffset
);
472 PKEY_VALUE_FULL_INFORMATION PeripheralFullDescriptor
= PeripheralInformation
[IoQueryDeviceConfigurationData
];
473 PCM_FULL_RESOURCE_DESCRIPTOR PeripheralResourceDescriptor
= (PCM_FULL_RESOURCE_DESCRIPTOR
)((PCHAR
)PeripheralFullDescriptor
+
474 PeripheralFullDescriptor
->DataOffset
);
476 PCM_PARTIAL_RESOURCE_DESCRIPTOR PartialDescriptor
;
477 PCM_FLOPPY_DEVICE_DATA FloppyDeviceData
;
481 UNREFERENCED_PARAMETER(PeripheralType
);
482 UNREFERENCED_PARAMETER(PeripheralNumber
);
483 UNREFERENCED_PARAMETER(BusInformation
);
484 UNREFERENCED_PARAMETER(Context
);
485 UNREFERENCED_PARAMETER(ControllerType
);
486 UNREFERENCED_PARAMETER(PathName
);
489 TRACE_(FLOPPY
, "ConfigCallback called with ControllerNumber %d\n", ControllerNumber
);
491 gControllerInfo
[gNumberOfControllers
].ControllerNumber
= ControllerNumber
;
492 gControllerInfo
[gNumberOfControllers
].InterfaceType
= BusType
;
493 gControllerInfo
[gNumberOfControllers
].BusNumber
= BusNumber
;
495 /* Get controller interrupt level/vector, dma channel, and port base */
496 for(i
= 0; i
< ControllerResourceDescriptor
->PartialResourceList
.Count
; i
++)
498 KeInitializeEvent(&gControllerInfo
[gNumberOfControllers
].SynchEvent
, NotificationEvent
, FALSE
);
500 PartialDescriptor
= &ControllerResourceDescriptor
->PartialResourceList
.PartialDescriptors
[i
];
502 if(PartialDescriptor
->Type
== CmResourceTypeInterrupt
)
504 gControllerInfo
[gNumberOfControllers
].Level
= PartialDescriptor
->u
.Interrupt
.Level
;
505 gControllerInfo
[gNumberOfControllers
].Vector
= PartialDescriptor
->u
.Interrupt
.Vector
;
507 if(PartialDescriptor
->Flags
& CM_RESOURCE_INTERRUPT_LATCHED
)
508 gControllerInfo
[gNumberOfControllers
].InterruptMode
= Latched
;
510 gControllerInfo
[gNumberOfControllers
].InterruptMode
= LevelSensitive
;
513 else if(PartialDescriptor
->Type
== CmResourceTypePort
)
515 PHYSICAL_ADDRESS TranslatedAddress
;
516 ULONG AddressSpace
= 0x1; /* I/O Port Range */
518 if(!HalTranslateBusAddress(BusType
, BusNumber
, PartialDescriptor
->u
.Port
.Start
, &AddressSpace
, &TranslatedAddress
))
520 WARN_(FLOPPY
, "HalTranslateBusAddress failed; returning\n");
521 return STATUS_IO_DEVICE_ERROR
;
524 if(AddressSpace
== 0)
525 gControllerInfo
[gNumberOfControllers
].BaseAddress
= MmMapIoSpace(TranslatedAddress
, FDC_PORT_BYTES
, MmNonCached
);
527 gControllerInfo
[gNumberOfControllers
].BaseAddress
= (PUCHAR
)(ULONG_PTR
)TranslatedAddress
.QuadPart
;
530 else if(PartialDescriptor
->Type
== CmResourceTypeDma
)
531 gControllerInfo
[gNumberOfControllers
].Dma
= PartialDescriptor
->u
.Dma
.Channel
;
534 /* Start with 0 drives, then go looking */
535 gControllerInfo
[gNumberOfControllers
].NumberOfDrives
= 0;
537 /* learn about drives attached to controller */
538 for(i
= 0; i
< PeripheralResourceDescriptor
->PartialResourceList
.Count
; i
++)
540 PDRIVE_INFO DriveInfo
= &gControllerInfo
[gNumberOfControllers
].DriveInfo
[i
];
542 PartialDescriptor
= &PeripheralResourceDescriptor
->PartialResourceList
.PartialDescriptors
[i
];
544 if(PartialDescriptor
->Type
!= CmResourceTypeDeviceSpecific
)
547 FloppyDeviceData
= (PCM_FLOPPY_DEVICE_DATA
)(PartialDescriptor
+ 1);
549 DriveInfo
->ControllerInfo
= &gControllerInfo
[gNumberOfControllers
];
550 DriveInfo
->UnitNumber
= i
;
552 DriveInfo
->FloppyDeviceData
.MaxDensity
= FloppyDeviceData
->MaxDensity
;
553 DriveInfo
->FloppyDeviceData
.MountDensity
= FloppyDeviceData
->MountDensity
;
554 DriveInfo
->FloppyDeviceData
.StepRateHeadUnloadTime
= FloppyDeviceData
->StepRateHeadUnloadTime
;
555 DriveInfo
->FloppyDeviceData
.HeadLoadTime
= FloppyDeviceData
->HeadLoadTime
;
556 DriveInfo
->FloppyDeviceData
.MotorOffTime
= FloppyDeviceData
->MotorOffTime
;
557 DriveInfo
->FloppyDeviceData
.SectorLengthCode
= FloppyDeviceData
->SectorLengthCode
;
558 DriveInfo
->FloppyDeviceData
.SectorPerTrack
= FloppyDeviceData
->SectorPerTrack
;
559 DriveInfo
->FloppyDeviceData
.ReadWriteGapLength
= FloppyDeviceData
->ReadWriteGapLength
;
560 DriveInfo
->FloppyDeviceData
.FormatGapLength
= FloppyDeviceData
->FormatGapLength
;
561 DriveInfo
->FloppyDeviceData
.FormatFillCharacter
= FloppyDeviceData
->FormatFillCharacter
;
562 DriveInfo
->FloppyDeviceData
.HeadSettleTime
= FloppyDeviceData
->HeadSettleTime
;
563 DriveInfo
->FloppyDeviceData
.MotorSettleTime
= FloppyDeviceData
->MotorSettleTime
;
564 DriveInfo
->FloppyDeviceData
.MaximumTrackValue
= FloppyDeviceData
->MaximumTrackValue
;
565 DriveInfo
->FloppyDeviceData
.DataTransferLength
= FloppyDeviceData
->DataTransferLength
;
567 /* Once it's all set up, acknowledge its existance in the controller info object */
568 gControllerInfo
[gNumberOfControllers
].NumberOfDrives
++;
571 gControllerInfo
[gNumberOfControllers
].Populated
= TRUE
;
572 gNumberOfControllers
++;
574 return STATUS_SUCCESS
;
579 Isr(PKINTERRUPT Interrupt
, PVOID ServiceContext
)
581 * FUNCTION: Interrupt service routine for the controllers
583 * Interrupt: Interrupt object representing the interrupt that occured
584 * ServiceContext: Pointer to the ControllerInfo object that caused the interrupt
586 * TRUE in all cases (see notes)
588 * - We should always be the target of the interrupt, being an edge-triggered ISA interrupt, but
589 * this won't be the case with a level-sensitive system like PCI
590 * - Note that it probably doesn't matter if the interrupt isn't dismissed, as it's edge-triggered.
591 * It probably won't keep re-interrupting.
592 * - There are two different ways to dismiss a floppy interrupt. If the command has a result phase
593 * (see intel datasheet), you dismiss the interrupt by reading the first data byte. If it does
594 * not, you dismiss the interrupt by doing a Sense Interrupt command. Again, because it's edge-
595 * triggered, this is safe to not do here, as we can just wait for the DPC.
596 * - Either way, we don't want to do this here. The controller shouldn't interrupt again, so we'll
597 * schedule a DPC to take care of it.
598 * - This driver really cannot shrare interrupts, as I don't know how to conclusively say
599 * whether it was our controller that interrupted or not. I just have to assume that any time
600 * my ISR gets called, it was my board that called it. Dumb design, yes, but it goes back to
601 * the semantics of ISA buses. That, and I don't know much about ISA drivers. :-)
602 * UPDATE: The high bit of Status Register A seems to work on non-AT controllers.
606 PCONTROLLER_INFO ControllerInfo
= (PCONTROLLER_INFO
)ServiceContext
;
608 UNREFERENCED_PARAMETER(Interrupt
);
610 ASSERT(ControllerInfo
);
612 TRACE_(FLOPPY
, "ISR called\n");
615 * Due to the stupidity of the drive/controller relationship on the floppy drive, only one device object
616 * can have an active interrupt pending. Due to the nature of these IRPs, though, there will only ever
617 * be one thread expecting an interrupt at a time, and furthermore, Interrupts (outside of spurious ones)
618 * won't ever happen unless a thread is expecting them. Therefore, all we have to do is signal an event
619 * and we're done. Queue a DPC and leave.
621 KeInsertQueueDpc(&ControllerInfo
->Dpc
, NULL
, NULL
);
628 DpcForIsr(PKDPC UnusedDpc
, PVOID Context
, PVOID SystemArgument1
, PVOID SystemArgument2
)
630 * FUNCTION: This DPC gets queued by every ISR. Does the real per-interrupt work.
632 * UnusedDpc: Pointer to the DPC object that represents our function
633 * DeviceObject: Device that this DPC is running for
635 * Context: Pointer to our ControllerInfo struct
637 * - This function just kicks off whatever the SynchEvent is and returns. We depend on
638 * the thing that caused the drive to interrupt to handle the work of clearing the interrupt.
639 * This enables us to get back to PASSIVE_LEVEL and not hog system time on a really stupid,
640 * slow, screwed-up piece of hardare.
641 * - If nothing is waiting for us to set the event, the interrupt is effectively lost and will
642 * never be dismissed. I wonder if this will become a problem.
643 * - Called at DISPATCH_LEVEL
646 PCONTROLLER_INFO ControllerInfo
= (PCONTROLLER_INFO
)Context
;
648 UNREFERENCED_PARAMETER(UnusedDpc
);
649 UNREFERENCED_PARAMETER(SystemArgument1
);
650 UNREFERENCED_PARAMETER(SystemArgument2
);
652 ASSERT(ControllerInfo
);
654 TRACE_(FLOPPY
, "DpcForIsr called\n");
656 KeSetEvent(&ControllerInfo
->SynchEvent
, EVENT_INCREMENT
, FALSE
);
660 static NTSTATUS NTAPI
661 InitController(PCONTROLLER_INFO ControllerInfo
)
663 * FUNCTION: Initialize a newly-found controller
665 * ControllerInfo: pointer to the controller to be initialized
667 * STATUS_SUCCESS if the controller is successfully initialized
668 * STATUS_IO_DEVICE_ERROR otherwise
673 UCHAR HeadUnloadTime
;
675 UCHAR ControllerVersion
;
678 ASSERT(ControllerInfo
);
680 TRACE_(FLOPPY
, "InitController called with Controller 0x%p\n", ControllerInfo
);
682 /* Get controller in a known state */
683 HwConfigure(ControllerInfo
, FALSE
, TRUE
, TRUE
, 0, 0);
685 /* Get the controller version */
686 ControllerVersion
= HwGetVersion(ControllerInfo
);
688 KeClearEvent(&ControllerInfo
->SynchEvent
);
690 /* Reset the controller */
691 if(HwReset(ControllerInfo
) != STATUS_SUCCESS
)
693 WARN_(FLOPPY
, "InitController: unable to reset controller\n");
694 return STATUS_IO_DEVICE_ERROR
;
697 INFO_(FLOPPY
, "InitController: waiting for initial interrupt\n");
699 /* Wait for an interrupt */
700 WaitForControllerInterrupt(ControllerInfo
);
702 /* Reset means you have to clear each of the four interrupts (one per drive) */
703 for(i
= 0; i
< MAX_DRIVES_PER_CONTROLLER
; i
++)
705 INFO_(FLOPPY
, "InitController: Sensing interrupt %d\n", i
);
707 if(HwSenseInterruptStatus(ControllerInfo
) != STATUS_SUCCESS
)
709 WARN_(FLOPPY
, "InitController: Unable to clear interrupt 0x%x\n", i
);
710 return STATUS_IO_DEVICE_ERROR
;
714 INFO_(FLOPPY
, "InitController: done sensing interrupts\n");
716 /* Next, see if we have the right version to do implied seek */
717 if(ControllerVersion
== VERSION_ENHANCED
)
719 /* If so, set that up -- all defaults below except first TRUE for EIS */
720 if(HwConfigure(ControllerInfo
, TRUE
, TRUE
, TRUE
, 0, 0) != STATUS_SUCCESS
)
722 WARN_(FLOPPY
, "InitController: unable to set up implied seek\n");
723 ControllerInfo
->ImpliedSeeks
= FALSE
;
727 INFO_(FLOPPY
, "InitController: implied seeks set!\n");
728 ControllerInfo
->ImpliedSeeks
= TRUE
;
732 * FIXME: Figure out the answer to the below
734 * I must admit that I'm really confused about the Model 30 issue. At least one
735 * important bit (the disk change bit in the DIR) is flipped if this is a Model 30
736 * controller. However, at least one other floppy driver believes that there are only
737 * two computers that are guaranteed to have a Model 30 controller:
741 * ...and another driver only lists a config option for "thinkpad", that flips
742 * the change line. A third driver doesn't mention the Model 30 issue at all.
744 * What I can't tell is whether or not the average, run-of-the-mill computer now has
745 * a Model 30 controller. For the time being, I'm going to wire this to FALSE,
746 * and just not support the computers mentioned above, while I try to figure out
747 * how ubiquitous these newfangled 30 thingies are.
749 //ControllerInfo->Model30 = TRUE;
750 ControllerInfo
->Model30
= FALSE
;
754 INFO_(FLOPPY
, "InitController: enhanced version not supported; disabling implied seeks\n");
755 ControllerInfo
->ImpliedSeeks
= FALSE
;
756 ControllerInfo
->Model30
= FALSE
;
760 WARN_(FLOPPY
, "FIXME: Figure out speed\n");
761 HeadLoadTime
= SPECIFY_HLT_500K
;
762 HeadUnloadTime
= SPECIFY_HUT_500K
;
763 StepRateTime
= SPECIFY_SRT_500K
;
765 INFO_(FLOPPY
, "InitController: setting data rate\n");
768 if(HwSetDataRate(ControllerInfo
, DRSR_DSEL_500KBPS
) != STATUS_SUCCESS
)
770 WARN_(FLOPPY
, "InitController: unable to set data rate\n");
771 return STATUS_IO_DEVICE_ERROR
;
774 INFO_(FLOPPY
, "InitController: issuing specify command to controller\n");
776 /* Don't disable DMA --> enable dma (dumb & confusing) */
777 if(HwSpecify(ControllerInfo
, HeadLoadTime
, HeadUnloadTime
, StepRateTime
, FALSE
) != STATUS_SUCCESS
)
779 WARN_(FLOPPY
, "InitController: unable to specify options\n");
780 return STATUS_IO_DEVICE_ERROR
;
783 /* Init the stop stuff */
784 KeInitializeDpc(&ControllerInfo
->MotorStopDpc
, MotorStopDpcFunc
, ControllerInfo
);
785 KeInitializeTimer(&ControllerInfo
->MotorTimer
);
786 KeInitializeEvent(&ControllerInfo
->MotorStoppedEvent
, NotificationEvent
, FALSE
);
787 ControllerInfo
->StopDpcQueued
= FALSE
;
790 * Recalibrate each drive on the controller (depends on StartMotor, which depends on the timer stuff above)
791 * We don't even know if there is a disk in the drive, so this may not work, but that's OK.
793 for(i
= 0; i
< ControllerInfo
->NumberOfDrives
; i
++)
795 INFO_(FLOPPY
, "InitController: recalibrating drive 0x%x on controller 0x%p\n", i
, ControllerInfo
);
796 Recalibrate(&ControllerInfo
->DriveInfo
[i
]);
799 INFO_(FLOPPY
, "InitController: done initializing; returning STATUS_SUCCESS\n");
801 return STATUS_SUCCESS
;
806 AddControllers(PDRIVER_OBJECT DriverObject
)
808 * FUNCTION: Called on initialization to find our controllers and build device and controller objects for them
810 * DriverObject: Our driver's DriverObject (so we can create devices against it)
812 * FALSE if we can't allocate a device, adapter, or interrupt object, or if we fail to find any controllers
813 * TRUE otherwise (i.e. we have at least one fully-configured controller)
815 * - Currently we only support ISA buses.
816 * - BUG: Windows 2000 seems to clobber the response from the IoQueryDeviceDescription callback, so now we
817 * just test a boolean value in the first object to see if it was completely populated. The same value
818 * is tested for each controller before we build device objects for it.
820 * - Report resource usage to the HAL
823 INTERFACE_TYPE InterfaceType
= Isa
;
824 CONFIGURATION_TYPE ControllerType
= DiskController
;
825 CONFIGURATION_TYPE PeripheralType
= FloppyDiskPeripheral
;
827 DEVICE_DESCRIPTION DeviceDescription
;
833 /* Find our controllers on all ISA buses */
834 IoQueryDeviceDescription(&InterfaceType
, 0, &ControllerType
, 0, &PeripheralType
, 0, ConfigCallback
, 0);
837 * w2k breaks the return val from ConfigCallback, so we have to hack around it, rather than just
838 * looking for a return value from ConfigCallback. We expect at least one controller.
840 if(!gControllerInfo
[0].Populated
)
842 WARN_(FLOPPY
, "AddControllers: failed to get controller info from registry\n");
846 /* Now that we have a controller, set it up with the system */
847 for(i
= 0; i
< gNumberOfControllers
&& gControllerInfo
[i
].NumberOfDrives
> 0; i
++)
849 /* 0: Report resource usage to the kernel, to make sure they aren't assigned to anyone else */
850 /* FIXME: Implement me. */
852 /* 1: Set up interrupt */
853 gControllerInfo
[i
].MappedVector
= HalGetInterruptVector(gControllerInfo
[i
].InterfaceType
, gControllerInfo
[i
].BusNumber
,
854 gControllerInfo
[i
].Level
, gControllerInfo
[i
].Vector
,
855 &gControllerInfo
[i
].MappedLevel
, &Affinity
);
857 /* Must set up the DPC before we connect the interrupt */
858 KeInitializeDpc(&gControllerInfo
[i
].Dpc
, DpcForIsr
, &gControllerInfo
[i
]);
860 INFO_(FLOPPY
, "Connecting interrupt %d to controller%d (object 0x%p)\n", gControllerInfo
[i
].MappedVector
,
861 i
, &gControllerInfo
[i
]);
863 /* NOTE: We cannot share our interrupt, even on level-triggered buses. See Isr() for details. */
864 if(IoConnectInterrupt(&gControllerInfo
[i
].InterruptObject
, Isr
, &gControllerInfo
[i
], 0, gControllerInfo
[i
].MappedVector
,
865 gControllerInfo
[i
].MappedLevel
, gControllerInfo
[i
].MappedLevel
, gControllerInfo
[i
].InterruptMode
,
866 FALSE
, Affinity
, 0) != STATUS_SUCCESS
)
868 WARN_(FLOPPY
, "AddControllers: unable to connect interrupt\n");
873 memset(&DeviceDescription
, 0, sizeof(DeviceDescription
));
874 DeviceDescription
.Version
= DEVICE_DESCRIPTION_VERSION
;
875 DeviceDescription
.DmaChannel
= gControllerInfo
[i
].Dma
;
876 DeviceDescription
.InterfaceType
= gControllerInfo
[i
].InterfaceType
;
877 DeviceDescription
.BusNumber
= gControllerInfo
[i
].BusNumber
;
878 DeviceDescription
.MaximumLength
= 2*18*512; /* based on a 1.44MB floppy */
880 /* DMA 0,1,2,3 are 8-bit; 4,5,6,7 are 16-bit (4 is chain i think) */
881 DeviceDescription
.DmaWidth
= gControllerInfo
[i
].Dma
> 3 ? Width16Bits
: Width8Bits
;
883 gControllerInfo
[i
].AdapterObject
= HalGetAdapter(&DeviceDescription
, &gControllerInfo
[i
].MapRegisters
);
885 if(!gControllerInfo
[i
].AdapterObject
)
887 WARN_(FLOPPY
, "AddControllers: unable to allocate an adapter object\n");
888 IoDisconnectInterrupt(gControllerInfo
[i
].InterruptObject
);
892 /* 2b: Initialize the new controller */
893 if(InitController(&gControllerInfo
[i
]) != STATUS_SUCCESS
)
895 WARN_(FLOPPY
, "AddControllers(): Unable to set up controller %d - initialization failed\n", i
);
896 IoDisconnectInterrupt(gControllerInfo
[i
].InterruptObject
);
900 /* 2c: Set the controller's initlized flag so we know to release stuff in Unload */
901 gControllerInfo
[i
].Initialized
= TRUE
;
903 /* 3: per-drive setup */
904 for(j
= 0; j
< gControllerInfo
[i
].NumberOfDrives
; j
++)
906 WCHAR DeviceNameBuf
[MAX_DEVICE_NAME
];
907 UNICODE_STRING DeviceName
;
908 UNICODE_STRING LinkName
;
909 UNICODE_STRING ArcPath
;
912 INFO_(FLOPPY
, "AddControllers(): Configuring drive %d on controller %d\n", i
, j
);
915 * 3a: create a device object for the drive
916 * Controllers and drives are 0-based, so the combos are:
928 DriveNumber
= (UCHAR
)(i
*4 + j
); /* loss of precision is OK; there are only 16 of 'em */
930 RtlZeroMemory(&DeviceNameBuf
, MAX_DEVICE_NAME
* sizeof(WCHAR
));
931 swprintf(DeviceNameBuf
, L
"\\Device\\Floppy%d", DriveNumber
);
932 RtlInitUnicodeString(&DeviceName
, DeviceNameBuf
);
934 if(IoCreateDevice(DriverObject
, sizeof(PVOID
), &DeviceName
,
935 FILE_DEVICE_DISK
, FILE_REMOVABLE_MEDIA
| FILE_FLOPPY_DISKETTE
, FALSE
,
936 &gControllerInfo
[i
].DriveInfo
[j
].DeviceObject
) != STATUS_SUCCESS
)
938 WARN_(FLOPPY
, "AddControllers: unable to register a Device object\n");
939 IoDisconnectInterrupt(gControllerInfo
[i
].InterruptObject
);
940 continue; /* continue on to next drive */
943 INFO_(FLOPPY
, "AddControllers: New device: %S (0x%p)\n", DeviceNameBuf
, gControllerInfo
[i
].DriveInfo
[j
].DeviceObject
);
945 /* 3b.5: Create an ARC path in case we're booting from this drive */
946 swprintf(gControllerInfo
[i
].DriveInfo
[j
].ArcPathBuffer
,
947 L
"\\ArcName\\multi(%d)disk(%d)fdisk(%d)", gControllerInfo
[i
].BusNumber
, i
, DriveNumber
);
949 RtlInitUnicodeString(&ArcPath
, gControllerInfo
[i
].DriveInfo
[j
].ArcPathBuffer
);
950 IoAssignArcName(&ArcPath
, &DeviceName
);
952 /* 3c: Set flags up */
953 gControllerInfo
[i
].DriveInfo
[j
].DeviceObject
->Flags
|= DO_DIRECT_IO
;
955 /* 3d: Create a symlink */
956 swprintf(gControllerInfo
[i
].DriveInfo
[j
].SymLinkBuffer
, L
"\\DosDevices\\%c:", DriveNumber
+ 'A');
957 RtlInitUnicodeString(&LinkName
, gControllerInfo
[i
].DriveInfo
[j
].SymLinkBuffer
);
958 if(IoCreateSymbolicLink(&LinkName
, &DeviceName
) != STATUS_SUCCESS
)
960 WARN_(FLOPPY
, "AddControllers: Unable to create a symlink for drive %d\n", DriveNumber
);
961 IoDisconnectInterrupt(gControllerInfo
[i
].InterruptObject
);
962 IoDeassignArcName(&ArcPath
);
963 continue; /* continue to next drive */
966 /* 3e: Increase global floppy drives count */
967 IoGetConfigurationInformation()->FloppyCount
++;
969 /* 3f: Set up the DPC */
970 IoInitializeDpcRequest(gControllerInfo
[i
].DriveInfo
[j
].DeviceObject
, (PIO_DPC_ROUTINE
)DpcForIsr
);
972 /* 3g: Point the device extension at our DriveInfo struct */
973 gControllerInfo
[i
].DriveInfo
[j
].DeviceObject
->DeviceExtension
= &gControllerInfo
[i
].DriveInfo
[j
];
975 /* 3h: neat comic strip */
977 /* 3i: set the initial media type to unknown */
978 memset(&gControllerInfo
[i
].DriveInfo
[j
].DiskGeometry
, 0, sizeof(DISK_GEOMETRY
));
979 gControllerInfo
[i
].DriveInfo
[j
].DiskGeometry
.MediaType
= Unknown
;
981 /* 3j: Now that we're done, set the Initialized flag so we know to free this in Unload */
982 gControllerInfo
[i
].DriveInfo
[j
].Initialized
= TRUE
;
984 /* 3k: Clear the DO_DEVICE_INITIALIZING flag */
985 gControllerInfo
[i
].DriveInfo
[j
].DeviceObject
->Flags
&= ~DO_DEVICE_INITIALIZING
;
989 INFO_(FLOPPY
, "AddControllers: --------------------------------------------> finished adding controllers\n");
991 return (IoGetConfigurationInformation()->FloppyCount
!= 0);
996 SignalMediaChanged(PDEVICE_OBJECT DeviceObject
, PIRP Irp
)
998 * FUNCTION: Process an IRP when the media has changed, and possibly notify the user
1000 * DeviceObject: DeviceObject associated with the IRP
1001 * Irp: IRP that we're failing due to change
1003 * - This procedure is documented in the DDK by "Notifying the File System of Possible Media Changes",
1004 * "IoSetHardErrorOrVerifyDevice", and by "Responding to Check-Verify Requests from the File System".
1005 * - Callable at <= DISPATCH_LEVEL
1008 PDRIVE_INFO DriveInfo
= DeviceObject
->DeviceExtension
;
1010 TRACE_(FLOPPY
, "SignalMediaChanged called\n");
1012 DriveInfo
->DiskChangeCount
++;
1014 /* If volume is not mounted, do NOT set verify and return STATUS_IO_DEVICE_ERROR */
1015 if(!(DeviceObject
->Vpb
->Flags
& VPB_MOUNTED
))
1017 Irp
->IoStatus
.Status
= STATUS_IO_DEVICE_ERROR
;
1018 Irp
->IoStatus
.Information
= 0;
1022 /* Notify the filesystem that it will need to verify the volume */
1023 DeviceObject
->Flags
|= DO_VERIFY_VOLUME
;
1024 Irp
->IoStatus
.Status
= STATUS_VERIFY_REQUIRED
;
1025 Irp
->IoStatus
.Information
= 0;
1028 * If this is a user-based, threaded request, let the IO manager know to pop up a box asking
1029 * the user to supply the correct media, but only if the error (which we just picked out above)
1030 * is deemed by the IO manager to be "user induced". The reason we don't just unconditionally
1031 * call IoSetHardError... is because MS might change the definition of "user induced" some day,
1032 * and we don't want to have to remember to re-code this.
1034 if(Irp
->Tail
.Overlay
.Thread
&& IoIsErrorUserInduced(Irp
->IoStatus
.Status
))
1035 IoSetHardErrorOrVerifyDevice(Irp
, DeviceObject
);
1040 QueueThread(PVOID Context
)
1042 * FUNCTION: Thread that manages the queue and dispatches any queued requests
1048 PIO_STACK_LOCATION Stack
;
1049 PDEVICE_OBJECT DeviceObject
;
1053 UNREFERENCED_PARAMETER(Context
);
1055 Objects
[0] = &QueueSemaphore
;
1056 Objects
[1] = &QueueThreadTerminate
;
1060 KeWaitForMultipleObjects(2, Objects
, WaitAny
, Executive
, KernelMode
, FALSE
, NULL
, NULL
);
1062 if(KeReadStateEvent(&QueueThreadTerminate
))
1064 INFO_(FLOPPY
, "QueueThread terminating\n");
1068 INFO_(FLOPPY
, "QueueThread: servicing an IRP\n");
1070 Irp
= IoCsqRemoveNextIrp(&Csq
, 0);
1072 /* we won't get an irp if it was canceled */
1075 INFO_(FLOPPY
, "QueueThread: IRP queue empty\n");
1079 DeviceObject
= (PDEVICE_OBJECT
)Irp
->Tail
.Overlay
.DriverContext
[0];
1081 ASSERT(DeviceObject
);
1083 Stack
= IoGetCurrentIrpStackLocation(Irp
);
1085 /* Decide what to do with the IRP */
1086 switch(Stack
->MajorFunction
)
1090 ReadWritePassive(DeviceObject
->DeviceExtension
, Irp
);
1093 case IRP_MJ_DEVICE_CONTROL
:
1094 DeviceIoctlPassive(DeviceObject
->DeviceExtension
, Irp
);
1098 WARN_(FLOPPY
, "QueueThread(): Unrecognized irp: mj: 0x%x\n", Stack
->MajorFunction
);
1099 Irp
->IoStatus
.Status
= STATUS_NOT_SUPPORTED
;
1100 Irp
->IoStatus
.Information
= 0;
1101 IoCompleteRequest(Irp
, IO_NO_INCREMENT
);
1108 DriverEntry(PDRIVER_OBJECT DriverObject
, PUNICODE_STRING RegistryPath
)
1110 * FUNCTION: Entry-point for the driver
1112 * DriverObject: Our driver object
1113 * RegistryPath: Unused
1115 * STATUS_SUCCESS on successful initialization of at least one drive
1116 * STATUS_NO_SUCH_DEVICE if we didn't find even one drive
1117 * STATUS_UNSUCCESSFUL otherwise
1120 HANDLE ThreadHandle
;
1122 UNREFERENCED_PARAMETER(RegistryPath
);
1125 * Set up dispatch routines
1127 DriverObject
->MajorFunction
[IRP_MJ_CREATE
] = (PDRIVER_DISPATCH
)CreateClose
;
1128 DriverObject
->MajorFunction
[IRP_MJ_CLOSE
] = (PDRIVER_DISPATCH
)CreateClose
;
1129 DriverObject
->MajorFunction
[IRP_MJ_READ
] = (PDRIVER_DISPATCH
)ReadWrite
;
1130 DriverObject
->MajorFunction
[IRP_MJ_WRITE
] = (PDRIVER_DISPATCH
)ReadWrite
;
1131 DriverObject
->MajorFunction
[IRP_MJ_DEVICE_CONTROL
] = (PDRIVER_DISPATCH
)DeviceIoctl
;
1133 DriverObject
->DriverUnload
= Unload
;
1136 * We depend on some zeroes in these structures. I know this is supposed to be
1137 * initialized to 0 by the complier but this makes me feel beter.
1139 memset(&gControllerInfo
, 0, sizeof(gControllerInfo
));
1142 * Set up queue. This routine cannot fail (trust me, I wrote it).
1144 IoCsqInitialize(&Csq
, CsqInsertIrp
, CsqRemoveIrp
, CsqPeekNextIrp
,
1145 CsqAcquireLock
, CsqReleaseLock
, CsqCompleteCanceledIrp
);
1150 KeInitializeSpinLock(&IrpQueueLock
);
1153 * ...and the queue list itself
1155 InitializeListHead(&IrpQueue
);
1158 * The queue is counted by a semaphore. The queue management thread
1159 * blocks on this semaphore, so if requests come in faster than the queue
1160 * thread can handle them, the semaphore count goes up.
1162 KeInitializeSemaphore(&QueueSemaphore
, 0, 0x7fffffff);
1165 * Event to terminate that thread
1167 KeInitializeEvent(&QueueThreadTerminate
, NotificationEvent
, FALSE
);
1170 * Create the queue processing thread. Save its handle in the global variable
1171 * ThreadHandle so we can wait on its termination during Unload.
1173 if(PsCreateSystemThread(&ThreadHandle
, THREAD_ALL_ACCESS
, 0, 0, 0, QueueThread
, 0) != STATUS_SUCCESS
)
1175 WARN_(FLOPPY
, "Unable to create system thread; failing init\n");
1176 return STATUS_INSUFFICIENT_RESOURCES
;
1179 if(ObReferenceObjectByHandle(ThreadHandle
, STANDARD_RIGHTS_ALL
, *PsThreadType
, KernelMode
, &QueueThreadObject
, NULL
) != STATUS_SUCCESS
)
1181 WARN_(FLOPPY
, "Unable to reference returned thread handle; failing init\n");
1182 return STATUS_UNSUCCESSFUL
;
1186 * Close the handle, now that we have the object pointer and a reference of our own.
1187 * The handle will certainly not be valid in the context of the caller next time we
1188 * need it, as handles are process-specific.
1190 ZwClose(ThreadHandle
);
1193 * Start the device discovery proces. Returns STATUS_SUCCESS if
1194 * it finds even one drive attached to one controller.
1196 if(!AddControllers(DriverObject
))
1197 return STATUS_NO_SUCH_DEVICE
;
1199 return STATUS_SUCCESS
;