2 Produce Simple File System abstractions for directories on your PC using Posix APIs.
3 The configuration of what devices to mount or emulate comes from UNIX
4 environment variables. The variables must be visible to the Microsoft*
5 Developer Studio for them to work.
7 Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
8 Portions copyright (c) 2011, Apple Inc. All rights reserved.
9 This program and the accompanying materials
10 are licensed and made available under the terms and conditions of the BSD License
11 which accompanies this distribution. The full text of the license may be found at
12 http://opensource.org/licenses/bsd-license.php
14 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
15 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
19 #include "EmuSimpleFileSystem.h"
25 Opens a new file relative to the source file's location.
27 @param This The protocol instance pointer.
28 @param NewHandle Returns File Handle for FileName.
29 @param FileName Null terminated string. "\", ".", and ".." are supported.
30 @param OpenMode Open mode for file.
31 @param Attributes Only used for EFI_FILE_MODE_CREATE.
33 @retval EFI_SUCCESS The device was opened.
34 @retval EFI_NOT_FOUND The specified file could not be found on the device.
35 @retval EFI_NO_MEDIA The device has no media.
36 @retval EFI_MEDIA_CHANGED The media has changed.
37 @retval EFI_DEVICE_ERROR The device reported an error.
38 @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.
39 @retval EFI_ACCESS_DENIED The service denied access to the file.
40 @retval EFI_OUT_OF_RESOURCES The volume was not opened due to lack of resources.
41 @retval EFI_VOLUME_FULL The volume is full.
46 EmuSimpleFileSystemOpen (
47 IN EFI_FILE_PROTOCOL
*This
,
48 OUT EFI_FILE_PROTOCOL
**NewHandle
,
54 EMU_EFI_FILE_PRIVATE
*PrivateFile
;
57 // Check for obvious invalid parameters.
59 if (This
== NULL
|| NewHandle
== NULL
|| FileName
== NULL
) {
60 return EFI_INVALID_PARAMETER
;
64 case EFI_FILE_MODE_CREATE
| EFI_FILE_MODE_READ
| EFI_FILE_MODE_WRITE
:
65 if (Attributes
&~EFI_FILE_VALID_ATTR
) {
66 return EFI_INVALID_PARAMETER
;
69 if (Attributes
& EFI_FILE_READ_ONLY
) {
70 return EFI_INVALID_PARAMETER
;
76 case EFI_FILE_MODE_READ
:
77 case EFI_FILE_MODE_READ
| EFI_FILE_MODE_WRITE
:
81 return EFI_INVALID_PARAMETER
;
84 PrivateFile
= EMU_EFI_FILE_PRIVATE_DATA_FROM_THIS (This
);
86 return PrivateFile
->Io
->Open (PrivateFile
->Io
, NewHandle
, FileName
, OpenMode
, Attributes
);
94 @param This Protocol instance pointer.
96 @retval EFI_SUCCESS The file was closed.
101 EmuSimpleFileSystemClose (
102 IN EFI_FILE_PROTOCOL
*This
106 EMU_EFI_FILE_PRIVATE
*PrivateFile
;
110 return EFI_INVALID_PARAMETER
;
113 PrivateFile
= EMU_EFI_FILE_PRIVATE_DATA_FROM_THIS (This
);
115 OldTpl
= gBS
->RaiseTPL (TPL_CALLBACK
);
117 Status
= PrivateFile
->Io
->Close (PrivateFile
->Io
);
118 if (!EFI_ERROR (Status
)) {
119 gBS
->FreePool (PrivateFile
);
122 gBS
->RestoreTPL (OldTpl
);
129 Close and delete the file handle.
131 @param This Protocol instance pointer.
133 @retval EFI_SUCCESS The file was closed and deleted.
134 @retval EFI_WARN_DELETE_FAILURE The handle was closed but the file was not deleted.
139 EmuSimpleFileSystemDelete (
140 IN EFI_FILE_PROTOCOL
*This
144 EMU_EFI_FILE_PRIVATE
*PrivateFile
;
148 return EFI_INVALID_PARAMETER
;
151 OldTpl
= gBS
->RaiseTPL (TPL_CALLBACK
);
153 PrivateFile
= EMU_EFI_FILE_PRIVATE_DATA_FROM_THIS (This
);
155 Status
= PrivateFile
->Io
->Delete (PrivateFile
->Io
);
156 if (!EFI_ERROR (Status
)) {
157 gBS
->FreePool (PrivateFile
);
160 gBS
->RestoreTPL (OldTpl
);
167 Read data from the file.
169 @param This Protocol instance pointer.
170 @param BufferSize On input size of buffer, on output amount of data in buffer.
171 @param Buffer The buffer in which data is read.
173 @retval EFI_SUCCESS Data was read.
174 @retval EFI_NO_MEDIA The device has no media.
175 @retval EFI_DEVICE_ERROR The device reported an error.
176 @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.
177 @retval EFI_BUFFER_TO_SMALL BufferSize is too small. BufferSize contains required size.
182 EmuSimpleFileSystemRead (
183 IN EFI_FILE_PROTOCOL
*This
,
184 IN OUT UINTN
*BufferSize
,
189 EMU_EFI_FILE_PRIVATE
*PrivateFile
;
192 if (This
== NULL
|| BufferSize
== NULL
) {
193 return EFI_INVALID_PARAMETER
;
196 if ((*BufferSize
!= 0) && (Buffer
== NULL
)) {
197 // Buffer can be NULL if *BufferSize is zero
198 return EFI_INVALID_PARAMETER
;
201 OldTpl
= gBS
->RaiseTPL (TPL_CALLBACK
);
203 PrivateFile
= EMU_EFI_FILE_PRIVATE_DATA_FROM_THIS (This
);
205 Status
= PrivateFile
->Io
->Read (PrivateFile
->Io
, BufferSize
, Buffer
);
207 gBS
->RestoreTPL (OldTpl
);
213 Write data to a file.
215 @param This Protocol instance pointer.
216 @param BufferSize On input size of buffer, on output amount of data in buffer.
217 @param Buffer The buffer in which data to write.
219 @retval EFI_SUCCESS Data was written.
220 @retval EFI_UNSUPPORTED Writes to Open directory are not supported.
221 @retval EFI_NO_MEDIA The device has no media.
222 @retval EFI_DEVICE_ERROR The device reported an error.
223 @retval EFI_DEVICE_ERROR An attempt was made to write to a deleted file.
224 @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.
225 @retval EFI_WRITE_PROTECTED The device is write protected.
226 @retval EFI_ACCESS_DENIED The file was open for read only.
227 @retval EFI_VOLUME_FULL The volume is full.
232 EmuSimpleFileSystemWrite (
233 IN EFI_FILE_PROTOCOL
*This
,
234 IN OUT UINTN
*BufferSize
,
239 EMU_EFI_FILE_PRIVATE
*PrivateFile
;
242 if (This
== NULL
|| BufferSize
== NULL
|| Buffer
== NULL
) {
243 return EFI_INVALID_PARAMETER
;
246 OldTpl
= gBS
->RaiseTPL (TPL_CALLBACK
);
248 PrivateFile
= EMU_EFI_FILE_PRIVATE_DATA_FROM_THIS (This
);
250 Status
= PrivateFile
->Io
->Write (PrivateFile
->Io
, BufferSize
, Buffer
);
252 gBS
->RestoreTPL (OldTpl
);
258 Get a file's current position
260 @param This Protocol instance pointer.
261 @param Position Byte position from the start of the file.
263 @retval EFI_SUCCESS Position was updated.
264 @retval EFI_UNSUPPORTED Seek request for non-zero is not valid on open.
269 EmuSimpleFileSystemGetPosition (
270 IN EFI_FILE_PROTOCOL
*This
,
275 EMU_EFI_FILE_PRIVATE
*PrivateFile
;
278 if (This
== NULL
|| Position
== NULL
) {
279 return EFI_INVALID_PARAMETER
;
282 OldTpl
= gBS
->RaiseTPL (TPL_CALLBACK
);
284 PrivateFile
= EMU_EFI_FILE_PRIVATE_DATA_FROM_THIS (This
);
286 Status
= PrivateFile
->Io
->GetPosition (PrivateFile
->Io
, Position
);
288 gBS
->RestoreTPL (OldTpl
);
295 Set file's current position
297 @param This Protocol instance pointer.
298 @param Position Byte position from the start of the file.
300 @retval EFI_SUCCESS Position was updated.
301 @retval EFI_UNSUPPORTED Seek request for non-zero is not valid on open..
306 EmuSimpleFileSystemSetPosition (
307 IN EFI_FILE_PROTOCOL
*This
,
312 EMU_EFI_FILE_PRIVATE
*PrivateFile
;
316 return EFI_INVALID_PARAMETER
;
319 OldTpl
= gBS
->RaiseTPL (TPL_CALLBACK
);
321 PrivateFile
= EMU_EFI_FILE_PRIVATE_DATA_FROM_THIS (This
);
323 Status
= PrivateFile
->Io
->SetPosition (PrivateFile
->Io
, Position
);
325 gBS
->RestoreTPL (OldTpl
);
331 Get information about a file.
333 @param This Protocol instance pointer.
334 @param InformationType Type of information to return in Buffer.
335 @param BufferSize On input size of buffer, on output amount of data in buffer.
336 @param Buffer The buffer to return data.
338 @retval EFI_SUCCESS Data was returned.
339 @retval EFI_UNSUPPORTED InformationType is not supported.
340 @retval EFI_NO_MEDIA The device has no media.
341 @retval EFI_DEVICE_ERROR The device reported an error.
342 @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.
343 @retval EFI_WRITE_PROTECTED The device is write protected.
344 @retval EFI_ACCESS_DENIED The file was open for read only.
345 @retval EFI_BUFFER_TOO_SMALL Buffer was too small; required size returned in BufferSize.
350 EmuSimpleFileSystemGetInfo (
351 IN EFI_FILE_PROTOCOL
*This
,
352 IN EFI_GUID
*InformationType
,
353 IN OUT UINTN
*BufferSize
,
358 EMU_EFI_FILE_PRIVATE
*PrivateFile
;
361 if (This
== NULL
|| InformationType
== NULL
|| BufferSize
== NULL
) {
362 return EFI_INVALID_PARAMETER
;
365 OldTpl
= gBS
->RaiseTPL (TPL_CALLBACK
);
367 PrivateFile
= EMU_EFI_FILE_PRIVATE_DATA_FROM_THIS (This
);
369 Status
= PrivateFile
->Io
->GetInfo (PrivateFile
->Io
, InformationType
, BufferSize
, Buffer
);
371 gBS
->RestoreTPL (OldTpl
);
377 Set information about a file
379 @param File Protocol instance pointer.
380 @param InformationType Type of information in Buffer.
381 @param BufferSize Size of buffer.
382 @param Buffer The data to write.
384 @retval EFI_SUCCESS Data was set.
385 @retval EFI_UNSUPPORTED InformationType is not supported.
386 @retval EFI_NO_MEDIA The device has no media.
387 @retval EFI_DEVICE_ERROR The device reported an error.
388 @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.
389 @retval EFI_WRITE_PROTECTED The device is write protected.
390 @retval EFI_ACCESS_DENIED The file was open for read only.
395 EmuSimpleFileSystemSetInfo (
396 IN EFI_FILE_PROTOCOL
*This
,
397 IN EFI_GUID
*InformationType
,
403 EMU_EFI_FILE_PRIVATE
*PrivateFile
;
407 // Check for invalid parameters.
409 if (This
== NULL
|| InformationType
== NULL
|| BufferSize
== 0 || Buffer
== NULL
) {
410 return EFI_INVALID_PARAMETER
;
413 OldTpl
= gBS
->RaiseTPL (TPL_CALLBACK
);
415 PrivateFile
= EMU_EFI_FILE_PRIVATE_DATA_FROM_THIS (This
);
417 Status
= PrivateFile
->Io
->SetInfo (PrivateFile
->Io
, InformationType
, BufferSize
, Buffer
);
419 gBS
->RestoreTPL (OldTpl
);
425 Flush data back for the file handle.
427 @param This Protocol instance pointer.
429 @retval EFI_SUCCESS Data was flushed.
430 @retval EFI_UNSUPPORTED Writes to Open directory are not supported.
431 @retval EFI_NO_MEDIA The device has no media.
432 @retval EFI_DEVICE_ERROR The device reported an error.
433 @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.
434 @retval EFI_WRITE_PROTECTED The device is write protected.
435 @retval EFI_ACCESS_DENIED The file was open for read only.
436 @retval EFI_VOLUME_FULL The volume is full.
441 EmuSimpleFileSystemFlush (
442 IN EFI_FILE_PROTOCOL
*This
446 EMU_EFI_FILE_PRIVATE
*PrivateFile
;
450 return EFI_INVALID_PARAMETER
;
453 OldTpl
= gBS
->RaiseTPL (TPL_CALLBACK
);
455 PrivateFile
= EMU_EFI_FILE_PRIVATE_DATA_FROM_THIS (This
);
457 Status
= PrivateFile
->Io
->Flush (PrivateFile
->Io
);
459 gBS
->RestoreTPL (OldTpl
);
466 Open the root directory on a volume.
468 @param This Protocol instance pointer.
469 @param Root Returns an Open file handle for the root directory
471 @retval EFI_SUCCESS The device was opened.
472 @retval EFI_UNSUPPORTED This volume does not support the file system.
473 @retval EFI_NO_MEDIA The device has no media.
474 @retval EFI_DEVICE_ERROR The device reported an error.
475 @retval EFI_VOLUME_CORRUPTED The file system structures are corrupted.
476 @retval EFI_ACCESS_DENIED The service denied access to the file.
477 @retval EFI_OUT_OF_RESOURCES The volume was not opened due to lack of resources.
482 EmuSimpleFileSystemOpenVolume (
483 IN EFI_SIMPLE_FILE_SYSTEM_PROTOCOL
*This
,
484 OUT EFI_FILE_PROTOCOL
**Root
488 EMU_SIMPLE_FILE_SYSTEM_PRIVATE
*Private
;
489 EMU_EFI_FILE_PRIVATE
*PrivateFile
;
492 Status
= EFI_UNSUPPORTED
;
494 if (This
== NULL
|| Root
== NULL
) {
495 return EFI_INVALID_PARAMETER
;
498 OldTpl
= gBS
->RaiseTPL (TPL_CALLBACK
);
500 Private
= EMU_SIMPLE_FILE_SYSTEM_PRIVATE_DATA_FROM_THIS (This
);
502 PrivateFile
= AllocatePool (sizeof (EMU_EFI_FILE_PRIVATE
));
503 if (PrivateFile
== NULL
) {
504 Status
= EFI_OUT_OF_RESOURCES
;
508 PrivateFile
->Signature
= EMU_EFI_FILE_PRIVATE_SIGNATURE
;
509 PrivateFile
->IoThunk
= Private
->IoThunk
;
510 PrivateFile
->SimpleFileSystem
= This
;
511 PrivateFile
->EfiFile
.Revision
= EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_REVISION
;
512 PrivateFile
->EfiFile
.Open
= EmuSimpleFileSystemOpen
;
513 PrivateFile
->EfiFile
.Close
= EmuSimpleFileSystemClose
;
514 PrivateFile
->EfiFile
.Delete
= EmuSimpleFileSystemDelete
;
515 PrivateFile
->EfiFile
.Read
= EmuSimpleFileSystemRead
;
516 PrivateFile
->EfiFile
.Write
= EmuSimpleFileSystemWrite
;
517 PrivateFile
->EfiFile
.GetPosition
= EmuSimpleFileSystemGetPosition
;
518 PrivateFile
->EfiFile
.SetPosition
= EmuSimpleFileSystemSetPosition
;
519 PrivateFile
->EfiFile
.GetInfo
= EmuSimpleFileSystemGetInfo
;
520 PrivateFile
->EfiFile
.SetInfo
= EmuSimpleFileSystemSetInfo
;
521 PrivateFile
->EfiFile
.Flush
= EmuSimpleFileSystemFlush
;
523 *Root
= &PrivateFile
->EfiFile
;
525 Status
= Private
->Io
->OpenVolume (Private
->Io
, &PrivateFile
->Io
);
526 if (EFI_ERROR (Status
)) {
532 gEmuSimpleFileSystemComponentName
.SupportedLanguages
,
533 &Private
->ControllerNameTable
,
534 Private
->IoThunk
->ConfigString
,
540 gEmuSimpleFileSystemComponentName
.SupportedLanguages
,
541 &Private
->ControllerNameTable
,
542 Private
->IoThunk
->ConfigString
,
548 if (EFI_ERROR (Status
)) {
550 gBS
->FreePool (PrivateFile
);
556 gBS
->RestoreTPL (OldTpl
);
562 Tests to see if this driver supports a given controller. If a child device is provided,
563 it further tests to see if this driver supports creating a handle for the specified child device.
565 This function checks to see if the driver specified by This supports the device specified by
566 ControllerHandle. Drivers will typically use the device path attached to
567 ControllerHandle and/or the services from the bus I/O abstraction attached to
568 ControllerHandle to determine if the driver supports ControllerHandle. This function
569 may be called many times during platform initialization. In order to reduce boot times, the tests
570 performed by this function must be very small, and take as little time as possible to execute. This
571 function must not change the state of any hardware devices, and this function must be aware that the
572 device specified by ControllerHandle may already be managed by the same driver or a
573 different driver. This function must match its calls to AllocatePages() with FreePages(),
574 AllocatePool() with FreePool(), and OpenProtocol() with CloseProtocol().
575 Because ControllerHandle may have been previously started by the same driver, if a protocol is
576 already in the opened state, then it must not be closed with CloseProtocol(). This is required
577 to guarantee the state of ControllerHandle is not modified by this function.
579 @param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
580 @param[in] ControllerHandle The handle of the controller to test. This handle
581 must support a protocol interface that supplies
582 an I/O abstraction to the driver.
583 @param[in] RemainingDevicePath A pointer to the remaining portion of a device path. This
584 parameter is ignored by device drivers, and is optional for bus
585 drivers. For bus drivers, if this parameter is not NULL, then
586 the bus driver must determine if the bus controller specified
587 by ControllerHandle and the child controller specified
588 by RemainingDevicePath are both supported by this
591 @retval EFI_SUCCESS The device specified by ControllerHandle and
592 RemainingDevicePath is supported by the driver specified by This.
593 @retval EFI_ALREADY_STARTED The device specified by ControllerHandle and
594 RemainingDevicePath is already being managed by the driver
596 @retval EFI_ACCESS_DENIED The device specified by ControllerHandle and
597 RemainingDevicePath is already being managed by a different
598 driver or an application that requires exclusive access.
599 Currently not implemented.
600 @retval EFI_UNSUPPORTED The device specified by ControllerHandle and
601 RemainingDevicePath is not supported by the driver specified by This.
605 EmuSimpleFileSystemDriverBindingSupported (
606 IN EFI_DRIVER_BINDING_PROTOCOL
*This
,
607 IN EFI_HANDLE ControllerHandle
,
608 IN EFI_DEVICE_PATH_PROTOCOL
*RemainingDevicePath
612 EMU_IO_THUNK_PROTOCOL
*EmuIoThunk
;
615 // Open the IO Abstraction(s) needed to perform the supported test
617 Status
= gBS
->OpenProtocol (
619 &gEmuIoThunkProtocolGuid
,
620 (VOID
**)&EmuIoThunk
,
621 This
->DriverBindingHandle
,
623 EFI_OPEN_PROTOCOL_BY_DRIVER
625 if (EFI_ERROR (Status
)) {
630 // Make sure GUID is for a File System handle.
632 Status
= EFI_UNSUPPORTED
;
633 if (CompareGuid (EmuIoThunk
->Protocol
, &gEfiSimpleFileSystemProtocolGuid
)) {
634 Status
= EFI_SUCCESS
;
638 // Close the I/O Abstraction(s) used to perform the supported test
642 &gEmuIoThunkProtocolGuid
,
643 This
->DriverBindingHandle
,
653 Starts a device controller or a bus controller.
655 The Start() function is designed to be invoked from the EFI boot service ConnectController().
656 As a result, much of the error checking on the parameters to Start() has been moved into this
657 common boot service. It is legal to call Start() from other locations,
658 but the following calling restrictions must be followed, or the system behavior will not be deterministic.
659 1. ControllerHandle must be a valid EFI_HANDLE.
660 2. If RemainingDevicePath is not NULL, then it must be a pointer to a naturally aligned
661 EFI_DEVICE_PATH_PROTOCOL.
662 3. Prior to calling Start(), the Supported() function for the driver specified by This must
663 have been called with the same calling parameters, and Supported() must have returned EFI_SUCCESS.
665 @param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
666 @param[in] ControllerHandle The handle of the controller to start. This handle
667 must support a protocol interface that supplies
668 an I/O abstraction to the driver.
669 @param[in] RemainingDevicePath A pointer to the remaining portion of a device path. This
670 parameter is ignored by device drivers, and is optional for bus
671 drivers. For a bus driver, if this parameter is NULL, then handles
672 for all the children of Controller are created by this driver.
673 If this parameter is not NULL and the first Device Path Node is
674 not the End of Device Path Node, then only the handle for the
675 child device specified by the first Device Path Node of
676 RemainingDevicePath is created by this driver.
677 If the first Device Path Node of RemainingDevicePath is
678 the End of Device Path Node, no child handle is created by this
681 @retval EFI_SUCCESS The device was started.
682 @retval EFI_DEVICE_ERROR The device could not be started due to a device error.Currently not implemented.
683 @retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
684 @retval Others The driver failded to start the device.
689 EmuSimpleFileSystemDriverBindingStart (
690 IN EFI_DRIVER_BINDING_PROTOCOL
*This
,
691 IN EFI_HANDLE ControllerHandle
,
692 IN EFI_DEVICE_PATH_PROTOCOL
*RemainingDevicePath
696 EMU_IO_THUNK_PROTOCOL
*EmuIoThunk
;
697 EMU_SIMPLE_FILE_SYSTEM_PRIVATE
*Private
;
702 // Open the IO Abstraction(s) needed
704 Status
= gBS
->OpenProtocol (
706 &gEmuIoThunkProtocolGuid
,
707 (VOID
**)&EmuIoThunk
,
708 This
->DriverBindingHandle
,
710 EFI_OPEN_PROTOCOL_BY_DRIVER
712 if (EFI_ERROR (Status
)) {
719 if (!CompareGuid (EmuIoThunk
->Protocol
, &gEfiSimpleFileSystemProtocolGuid
)) {
720 Status
= EFI_UNSUPPORTED
;
724 Private
= AllocateZeroPool (sizeof (EMU_SIMPLE_FILE_SYSTEM_PRIVATE
));
725 if (Private
== NULL
) {
726 Status
= EFI_OUT_OF_RESOURCES
;
730 Status
= EmuIoThunk
->Open (EmuIoThunk
);
731 if (EFI_ERROR (Status
)) {
735 Private
->Signature
= EMU_SIMPLE_FILE_SYSTEM_PRIVATE_SIGNATURE
;
736 Private
->IoThunk
= EmuIoThunk
;
737 Private
->Io
= EmuIoThunk
->Interface
;
739 Private
->SimpleFileSystem
.Revision
= EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_REVISION
;
740 Private
->SimpleFileSystem
.OpenVolume
= EmuSimpleFileSystemOpenVolume
;
742 Private
->ControllerNameTable
= NULL
;
746 gEmuSimpleFileSystemComponentName
.SupportedLanguages
,
747 &Private
->ControllerNameTable
,
748 EmuIoThunk
->ConfigString
,
754 gEmuSimpleFileSystemComponentName2
.SupportedLanguages
,
755 &Private
->ControllerNameTable
,
756 EmuIoThunk
->ConfigString
,
760 Status
= gBS
->InstallMultipleProtocolInterfaces (
762 &gEfiSimpleFileSystemProtocolGuid
, &Private
->SimpleFileSystem
,
767 if (EFI_ERROR (Status
)) {
768 if (Private
!= NULL
) {
769 if (Private
->ControllerNameTable
!= NULL
) {
770 FreeUnicodeStringTable (Private
->ControllerNameTable
);
773 gBS
->FreePool (Private
);
779 &gEmuIoThunkProtocolGuid
,
780 This
->DriverBindingHandle
,
790 Stops a device controller or a bus controller.
792 The Stop() function is designed to be invoked from the EFI boot service DisconnectController().
793 As a result, much of the error checking on the parameters to Stop() has been moved
794 into this common boot service. It is legal to call Stop() from other locations,
795 but the following calling restrictions must be followed, or the system behavior will not be deterministic.
796 1. ControllerHandle must be a valid EFI_HANDLE that was used on a previous call to this
797 same driver's Start() function.
798 2. The first NumberOfChildren handles of ChildHandleBuffer must all be a valid
799 EFI_HANDLE. In addition, all of these handles must have been created in this driver's
800 Start() function, and the Start() function must have called OpenProtocol() on
801 ControllerHandle with an Attribute of EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER.
803 @param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
804 @param[in] ControllerHandle A handle to the device being stopped. The handle must
805 support a bus specific I/O protocol for the driver
806 to use to stop the device.
807 @param[in] NumberOfChildren The number of child device handles in ChildHandleBuffer.
808 @param[in] ChildHandleBuffer An array of child handles to be freed. May be NULL
809 if NumberOfChildren is 0.
811 @retval EFI_SUCCESS The device was stopped.
812 @retval EFI_DEVICE_ERROR The device could not be stopped due to a device error.
817 EmuSimpleFileSystemDriverBindingStop (
818 IN EFI_DRIVER_BINDING_PROTOCOL
*This
,
819 IN EFI_HANDLE ControllerHandle
,
820 IN UINTN NumberOfChildren
,
821 IN EFI_HANDLE
*ChildHandleBuffer
825 EFI_SIMPLE_FILE_SYSTEM_PROTOCOL
*SimpleFileSystem
;
826 EMU_SIMPLE_FILE_SYSTEM_PRIVATE
*Private
;
829 // Get our context back
831 Status
= gBS
->OpenProtocol (
833 &gEfiSimpleFileSystemProtocolGuid
,
834 (VOID
**)&SimpleFileSystem
,
835 This
->DriverBindingHandle
,
837 EFI_OPEN_PROTOCOL_GET_PROTOCOL
839 if (EFI_ERROR (Status
)) {
840 return EFI_UNSUPPORTED
;
843 Private
= EMU_SIMPLE_FILE_SYSTEM_PRIVATE_DATA_FROM_THIS (SimpleFileSystem
);
844 Status
= Private
->IoThunk
->Close (Private
->IoThunk
);
847 // Uninstall the Simple File System Protocol from ControllerHandle
849 Status
= gBS
->UninstallMultipleProtocolInterfaces (
851 &gEfiSimpleFileSystemProtocolGuid
, &Private
->SimpleFileSystem
,
854 if (!EFI_ERROR (Status
)) {
855 Status
= gBS
->CloseProtocol (
857 &gEmuIoThunkProtocolGuid
,
858 This
->DriverBindingHandle
,
863 if (!EFI_ERROR (Status
)) {
865 // Free our instance data
867 FreeUnicodeStringTable (Private
->ControllerNameTable
);
868 gBS
->FreePool (Private
);
875 EFI_DRIVER_BINDING_PROTOCOL gEmuSimpleFileSystemDriverBinding
= {
876 EmuSimpleFileSystemDriverBindingSupported
,
877 EmuSimpleFileSystemDriverBindingStart
,
878 EmuSimpleFileSystemDriverBindingStop
,
888 The user Entry Point for module EmuSimpleFileSystem. The user code starts with this function.
890 @param[in] ImageHandle The firmware allocated handle for the EFI image.
891 @param[in] SystemTable A pointer to the EFI System Table.
893 @retval EFI_SUCCESS The entry point is executed successfully.
894 @retval other Some error occurs when executing this entry point.
899 InitializeEmuSimpleFileSystem(
900 IN EFI_HANDLE ImageHandle
,
901 IN EFI_SYSTEM_TABLE
*SystemTable
906 Status
= EfiLibInstallDriverBindingComponentName2 (
909 &gEmuSimpleFileSystemDriverBinding
,
911 &gEmuSimpleFileSystemComponentName
,
912 &gEmuSimpleFileSystemComponentName2
914 ASSERT_EFI_ERROR (Status
);