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CloverBootloader/Ext4Pkg/Ext4Dxe/Ext4Dxe.c

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/** @file
Driver entry point
Copyright (c) 2021 - 2023 Pedro Falcato All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "Ext4Dxe.h"
GLOBAL_REMOVE_IF_UNREFERENCED EFI_UNICODE_STRING_TABLE mExt4DriverNameTable[] = {
{
"eng;en",
L"Ext4 File System Driver"
},
{
NULL,
NULL
}
};
GLOBAL_REMOVE_IF_UNREFERENCED EFI_UNICODE_STRING_TABLE mExt4ControllerNameTable[] = {
{
"eng;en",
L"Ext4 File System"
},
{
NULL,
NULL
}
};
// Needed by gExt4ComponentName*
/**
Retrieves a Unicode string that is the user-readable name of the EFI Driver.
@param[in] This A pointer to the EFI_COMPONENT_NAME_PROTOCOL instance.
@param[in] Language A pointer to a three-character ISO 639-2 language identifier.
This is the language of the driver name that that the caller
is requesting, and it must match one of the languages specified
in SupportedLanguages. The number of languages supported by a
driver is up to the driver writer.
@param[out] DriverName A pointer to the Unicode string to return. This Unicode string
is the name of the driver specified by This in the language
specified by Language.
@retval EFI_SUCCESS The Unicode string for the Driver specified by This
and the language specified by Language was returned
in DriverName.
@retval EFI_INVALID_PARAMETER Language is NULL.
@retval EFI_INVALID_PARAMETER DriverName is NULL.
@retval EFI_UNSUPPORTED The driver specified by This does not support the
language specified by Language.
**/
EFI_STATUS
EFIAPI
Ext4ComponentNameGetDriverName (
IN EFI_COMPONENT_NAME_PROTOCOL *This,
IN CHAR8 *Language,
OUT CHAR16 **DriverName
);
/**
Retrieves a Unicode string that is the user readable name of the controller
that is being managed by an EFI Driver.
@param[in] This A pointer to the EFI_COMPONENT_NAME_PROTOCOL instance.
@param[in] ControllerHandle The handle of a controller that the driver specified by
This is managing. This handle specifies the controller
whose name is to be returned.
@param[in] ChildHandle The handle of the child controller to retrieve the name
of. This is an optional parameter that may be NULL. It
will be NULL for device drivers. It will also be NULL
for a bus drivers that wish to retrieve the name of the
bus controller. It will not be NULL for a bus driver
that wishes to retrieve the name of a child controller.
@param[in] Language A pointer to a three character ISO 639-2 language
identifier. This is the language of the controller name
that the caller is requesting, and it must match one
of the languages specified in SupportedLanguages. The
number of languages supported by a driver is up to the
driver writer.
@param[out] ControllerName A pointer to the Unicode string to return. This Unicode
string is the name of the controller specified by
ControllerHandle and ChildHandle in the language specified
by Language, from the point of view of the driver specified
by This.
@retval EFI_SUCCESS The Unicode string for the user-readable name in the
language specified by Language for the driver
specified by This was returned in DriverName.
@retval EFI_INVALID_PARAMETER ControllerHandle is NULL.
@retval EFI_INVALID_PARAMETER ChildHandle is not NULL and it is not a valid EFI_HANDLE.
@retval EFI_INVALID_PARAMETER Language is NULL.
@retval EFI_INVALID_PARAMETER ControllerName is NULL.
@retval EFI_UNSUPPORTED The driver specified by This is not currently managing
the controller specified by ControllerHandle and
ChildHandle.
@retval EFI_UNSUPPORTED The driver specified by This does not support the
language specified by Language.
**/
EFI_STATUS
EFIAPI
Ext4ComponentNameGetControllerName (
IN EFI_COMPONENT_NAME_PROTOCOL *This,
IN EFI_HANDLE ControllerHandle,
IN EFI_HANDLE ChildHandle OPTIONAL,
IN CHAR8 *Language,
OUT CHAR16 **ControllerName
);
extern EFI_COMPONENT_NAME_PROTOCOL gExt4ComponentName;
GLOBAL_REMOVE_IF_UNREFERENCED EFI_COMPONENT_NAME_PROTOCOL gExt4ComponentName = {
Ext4ComponentNameGetDriverName,
Ext4ComponentNameGetControllerName,
"eng"
};
//
// EFI Component Name 2 Protocol
//
GLOBAL_REMOVE_IF_UNREFERENCED EFI_COMPONENT_NAME2_PROTOCOL gExt4ComponentName2 = {
(EFI_COMPONENT_NAME2_GET_DRIVER_NAME)Ext4ComponentNameGetDriverName,
(EFI_COMPONENT_NAME2_GET_CONTROLLER_NAME)Ext4ComponentNameGetControllerName,
"en"
};
// Needed by gExt4BindingProtocol
/**
Tests to see if this driver supports a given controller. If a child device is provided,
it further tests to see if this driver supports creating a handle for the specified child device.
This function checks to see if the driver specified by This supports the device specified by
ControllerHandle. Drivers will typically use the device path attached to
ControllerHandle and/or the services from the bus I/O abstraction attached to
ControllerHandle to determine if the driver supports ControllerHandle. This function
may be called many times during platform initialization. In order to reduce boot times, the tests
performed by this function must be very small, and take as little time as possible to execute. This
function must not change the state of any hardware devices, and this function must be aware that the
device specified by ControllerHandle may already be managed by the same driver or a
different driver. This function must match its calls to AllocatePages() with FreePages(),
AllocatePool() with FreePool(), and OpenProtocol() with CloseProtocol().
Because ControllerHandle may have been previously started by the same driver, if a protocol is
already in the opened state, then it must not be closed with CloseProtocol(). This is required
to guarantee the state of ControllerHandle is not modified by this function.
@param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
@param[in] ControllerHandle The handle of the controller to test. This handle
must support a protocol interface that supplies
an I/O abstraction to the driver.
@param[in] RemainingDevicePath A pointer to the remaining portion of a device path. This
parameter is ignored by device drivers, and is optional for bus
drivers. For bus drivers, if this parameter is not NULL, then
the bus driver must determine if the bus controller specified
by ControllerHandle and the child controller specified
by RemainingDevicePath are both supported by this
bus driver.
@retval EFI_SUCCESS The device specified by ControllerHandle and
RemainingDevicePath is supported by the driver specified by This.
@retval EFI_ALREADY_STARTED The device specified by ControllerHandle and
RemainingDevicePath is already being managed by the driver
specified by This.
@retval EFI_ACCESS_DENIED The device specified by ControllerHandle and
RemainingDevicePath is already being managed by a different
driver or an application that requires exclusive access.
Currently not implemented.
@retval EFI_UNSUPPORTED The device specified by ControllerHandle and
RemainingDevicePath is not supported by the driver specified by This.
**/
EFI_STATUS
EFIAPI
Ext4IsBindingSupported (
IN EFI_DRIVER_BINDING_PROTOCOL *BindingProtocol,
IN EFI_HANDLE ControllerHandle,
IN EFI_DEVICE_PATH *RemainingDevicePath OPTIONAL
);
/**
Starts a device controller or a bus controller.
The Start() function is designed to be invoked from the EFI boot service ConnectController().
As a result, much of the error checking on the parameters to Start() has been moved into this
common boot service. It is legal to call Start() from other locations,
but the following calling restrictions must be followed, or the system behavior will not be deterministic.
1. ControllerHandle must be a valid EFI_HANDLE.
2. If RemainingDevicePath is not NULL, then it must be a pointer to a naturally aligned
EFI_DEVICE_PATH_PROTOCOL.
3. Prior to calling Start(), the Supported() function for the driver specified by This must
have been called with the same calling parameters, and Supported() must have returned EFI_SUCCESS.
@param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
@param[in] ControllerHandle The handle of the controller to start. This handle
must support a protocol interface that supplies
an I/O abstraction to the driver.
@param[in] RemainingDevicePath A pointer to the remaining portion of a device path. This
parameter is ignored by device drivers, and is optional for bus
drivers. For a bus driver, if this parameter is NULL, then handles
for all the children of Controller are created by this driver.
If this parameter is not NULL and the first Device Path Node is
not the End of Device Path Node, then only the handle for the
child device specified by the first Device Path Node of
RemainingDevicePath is created by this driver.
If the first Device Path Node of RemainingDevicePath is
the End of Device Path Node, no child handle is created by this
driver.
@retval EFI_SUCCESS The device was started.
@retval EFI_DEVICE_ERROR The device could not be started due to a device error.Currently not implemented.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
@retval Others The driver failded to start the device.
**/
EFI_STATUS
EFIAPI
Ext4Bind (
IN EFI_DRIVER_BINDING_PROTOCOL *BindingProtocol,
IN EFI_HANDLE ControllerHandle,
IN EFI_DEVICE_PATH *RemainingDevicePath OPTIONAL
);
/**
Stops a device controller or a bus controller.
The Stop() function is designed to be invoked from the EFI boot service DisconnectController().
As a result, much of the error checking on the parameters to Stop() has been moved
into this common boot service. It is legal to call Stop() from other locations,
but the following calling restrictions must be followed, or the system behavior will not be deterministic.
1. ControllerHandle must be a valid EFI_HANDLE that was used on a previous call to this
same driver's Start() function.
2. The first NumberOfChildren handles of ChildHandleBuffer must all be a valid
EFI_HANDLE. In addition, all of these handles must have been created in this driver's
Start() function, and the Start() function must have called OpenProtocol() on
ControllerHandle with an Attribute of EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER.
@param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
@param[in] ControllerHandle A handle to the device being stopped. The handle must
support a bus specific I/O protocol for the driver
to use to stop the device.
@param[in] NumberOfChildren The number of child device handles in ChildHandleBuffer.
@param[in] ChildHandleBuffer An array of child handles to be freed. May be NULL
if NumberOfChildren is 0.
@retval EFI_SUCCESS The device was stopped.
@retval EFI_DEVICE_ERROR The device could not be stopped due to a device error.
**/
EFI_STATUS
EFIAPI
Ext4Stop (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE ControllerHandle,
IN UINTN NumberOfChildren,
IN EFI_HANDLE *ChildHandleBuffer OPTIONAL
);
EFI_DRIVER_BINDING_PROTOCOL gExt4BindingProtocol =
{
.Supported = Ext4IsBindingSupported,
.Start = Ext4Bind,
.Stop = Ext4Stop,
.Version = EXT4_DRIVER_VERSION,
.ImageHandle = NULL,
.DriverBindingHandle = NULL
};
/**
Retrieves a Unicode string that is the user readable name of the controller
that is being managed by an EFI Driver.
@param[in] This A pointer to the EFI_COMPONENT_NAME_PROTOCOL instance.
@param[in] ControllerHandle The handle of a controller that the driver specified by
This is managing. This handle specifies the controller
whose name is to be returned.
@param[in] ChildHandle The handle of the child controller to retrieve the name
of. This is an optional parameter that may be NULL. It
will be NULL for device drivers. It will also be NULL
for a bus drivers that wish to retrieve the name of the
bus controller. It will not be NULL for a bus driver
that wishes to retrieve the name of a child controller.
@param[in] Language A pointer to a three character ISO 639-2 language
identifier. This is the language of the controller name
that the caller is requesting, and it must match one
of the languages specified in SupportedLanguages. The
number of languages supported by a driver is up to the
driver writer.
@param[out] ControllerName A pointer to the Unicode string to return. This Unicode
string is the name of the controller specified by
ControllerHandle and ChildHandle in the language specified
by Language, from the point of view of the driver specified
by This.
@retval EFI_SUCCESS The Unicode string for the user-readable name in the
language specified by Language for the driver
specified by This was returned in DriverName.
@retval EFI_INVALID_PARAMETER ControllerHandle is NULL.
@retval EFI_INVALID_PARAMETER ChildHandle is not NULL and it is not a valid EFI_HANDLE.
@retval EFI_INVALID_PARAMETER Language is NULL.
@retval EFI_INVALID_PARAMETER ControllerName is NULL.
@retval EFI_UNSUPPORTED The driver specified by This is not currently managing
the controller specified by ControllerHandle and
ChildHandle.
@retval EFI_UNSUPPORTED The driver specified by This does not support the
language specified by Language.
**/
EFI_STATUS
EFIAPI
Ext4ComponentNameGetControllerName (
IN EFI_COMPONENT_NAME_PROTOCOL *This,
IN EFI_HANDLE ControllerHandle,
IN EFI_HANDLE ChildHandle OPTIONAL,
IN CHAR8 *Language,
OUT CHAR16 **ControllerName
)
{
EFI_STATUS Status;
if (ChildHandle != NULL) {
return EFI_UNSUPPORTED;
}
// Test if the driver manages ControllHandle
Status = EfiTestManagedDevice (
ControllerHandle,
gExt4BindingProtocol.DriverBindingHandle,
&gEfiDiskIoProtocolGuid
);
if (EFI_ERROR (Status)) {
return Status;
}
return LookupUnicodeString2 (
Language,
This->SupportedLanguages,
mExt4ControllerNameTable,
ControllerName,
(BOOLEAN)(This == &gExt4ComponentName)
);
}
/**
Retrieves a Unicode string that is the user-readable name of the EFI Driver.
@param[in] This A pointer to the EFI_COMPONENT_NAME_PROTOCOL instance.
@param[in] Language A pointer to a three-character ISO 639-2 language identifier.
This is the language of the driver name that that the caller
is requesting, and it must match one of the languages specified
in SupportedLanguages. The number of languages supported by a
driver is up to the driver writer.
@param[out] DriverName A pointer to the Unicode string to return. This Unicode string
is the name of the driver specified by This in the language
specified by Language.
@retval EFI_SUCCESS The Unicode string for the Driver specified by This
and the language specified by Language was returned
in DriverName.
@retval EFI_INVALID_PARAMETER Language is NULL.
@retval EFI_INVALID_PARAMETER DriverName is NULL.
@retval EFI_UNSUPPORTED The driver specified by This does not support the
language specified by Language.
**/
EFI_STATUS
EFIAPI
Ext4ComponentNameGetDriverName (
IN EFI_COMPONENT_NAME_PROTOCOL *This,
IN CHAR8 *Language,
OUT CHAR16 **DriverName
)
{
return LookupUnicodeString2 (
Language,
This->SupportedLanguages,
mExt4DriverNameTable,
DriverName,
(BOOLEAN)(This == &gExt4ComponentName)
);
}
/**
Stops a device controller or a bus controller.
The Stop() function is designed to be invoked from the EFI boot service DisconnectController().
As a result, much of the error checking on the parameters to Stop() has been moved
into this common boot service. It is legal to call Stop() from other locations,
but the following calling restrictions must be followed, or the system behavior will not be deterministic.
1. ControllerHandle must be a valid EFI_HANDLE that was used on a previous call to this
same driver's Start() function.
2. The first NumberOfChildren handles of ChildHandleBuffer must all be a valid
EFI_HANDLE. In addition, all of these handles must have been created in this driver's
Start() function, and the Start() function must have called OpenProtocol() on
ControllerHandle with an Attribute of EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER.
@param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
@param[in] ControllerHandle A handle to the device being stopped. The handle must
support a bus specific I/O protocol for the driver
to use to stop the device.
@param[in] NumberOfChildren The number of child device handles in ChildHandleBuffer.
@param[in] ChildHandleBuffer An array of child handles to be freed. May be NULL
if NumberOfChildren is 0.
@retval EFI_SUCCESS The device was stopped.
@retval EFI_DEVICE_ERROR The device could not be stopped due to a device error.
**/
EFI_STATUS
EFIAPI
Ext4Stop (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE ControllerHandle,
IN UINTN NumberOfChildren,
IN EFI_HANDLE *ChildHandleBuffer OPTIONAL
)
{
EFI_STATUS Status;
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *Sfs;
EXT4_PARTITION *Partition;
BOOLEAN HasDiskIo2;
Status = gBS->OpenProtocol (
ControllerHandle,
&gEfiSimpleFileSystemProtocolGuid,
(VOID **)&Sfs,
This->DriverBindingHandle,
ControllerHandle,
EFI_OPEN_PROTOCOL_GET_PROTOCOL
);
if (EFI_ERROR (Status)) {
return Status;
}
Partition = (EXT4_PARTITION *)Sfs;
HasDiskIo2 = EXT4_DISK_IO2 (Partition) != NULL;
Status = Ext4UnmountAndFreePartition (Partition);
if (EFI_ERROR (Status)) {
return Status;
}
Status = gBS->UninstallMultipleProtocolInterfaces (
ControllerHandle,
&gEfiSimpleFileSystemProtocolGuid,
&Partition->Interface,
NULL
);
if (EFI_ERROR (Status)) {
return Status;
}
// Close all open protocols (DiskIo, DiskIo2, BlockIo)
Status = gBS->CloseProtocol (
ControllerHandle,
&gEfiDiskIoProtocolGuid,
This->DriverBindingHandle,
ControllerHandle
);
if (EFI_ERROR (Status)) {
return Status;
}
Status = gBS->CloseProtocol (
ControllerHandle,
&gEfiBlockIoProtocolGuid,
This->DriverBindingHandle,
ControllerHandle
);
if (EFI_ERROR (Status)) {
return Status;
}
if (HasDiskIo2) {
Status = gBS->CloseProtocol (
ControllerHandle,
&gEfiDiskIo2ProtocolGuid,
This->DriverBindingHandle,
ControllerHandle
);
if (EFI_ERROR (Status)) {
return Status;
}
}
return Status;
}
/**
Ext4Dxe Driver's entry point.
Called at load time.
@param[in] ImageHandle Handle to the image.
@param[in] SystemTable Pointer to the EFI_SYSTEM_TABLE.
@return Result of the load.
**/
EFI_STATUS
EFIAPI
Ext4EntryPoint (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
return EfiLibInstallAllDriverProtocols2 (
ImageHandle,
SystemTable,
&gExt4BindingProtocol,
ImageHandle,
&gExt4ComponentName,
&gExt4ComponentName2,
NULL,
NULL,
NULL,
NULL
);
}
/**
Ext4Dxe Driver's unload callback.
Called at unload time.
@param[in] ImageHandle Handle to the image.
@return Result of the unload.
**/
EFI_STATUS
EFIAPI
Ext4Unload (
IN EFI_HANDLE ImageHandle
)
{
EFI_STATUS Status;
EFI_HANDLE *DeviceHandleBuffer;
UINTN DeviceHandleCount;
UINTN Index;
EFI_HANDLE Handle;
Status = gBS->LocateHandleBuffer (
AllHandles,
NULL,
NULL,
&DeviceHandleCount,
&DeviceHandleBuffer
);
if (EFI_ERROR (Status)) {
return Status;
}
for (Index = 0; Index < DeviceHandleCount; Index++) {
Handle = DeviceHandleBuffer[Index];
Status = EfiTestManagedDevice (Handle, ImageHandle, &gEfiDiskIoProtocolGuid);
if (Status == EFI_SUCCESS) {
Status = gBS->DisconnectController (Handle, ImageHandle, NULL);
if (EFI_ERROR (Status)) {
break;
}
}
}
FreePool (DeviceHandleBuffer);
Status = EfiLibUninstallAllDriverProtocols2 (
&gExt4BindingProtocol,
&gExt4ComponentName,
&gExt4ComponentName2,
NULL,
NULL,
NULL,
NULL
);
return Status;
}
/**
Tests to see if this driver supports a given controller. If a child device is provided,
it further tests to see if this driver supports creating a handle for the specified child device.
This function checks to see if the driver specified by This supports the device specified by
ControllerHandle. Drivers will typically use the device path attached to
ControllerHandle and/or the services from the bus I/O abstraction attached to
ControllerHandle to determine if the driver supports ControllerHandle. This function
may be called many times during platform initialization. In order to reduce boot times, the tests
performed by this function must be very small, and take as little time as possible to execute. This
function must not change the state of any hardware devices, and this function must be aware that the
device specified by ControllerHandle may already be managed by the same driver or a
different driver. This function must match its calls to AllocatePages() with FreePages(),
AllocatePool() with FreePool(), and OpenProtocol() with CloseProtocol().
Because ControllerHandle may have been previously started by the same driver, if a protocol is
already in the opened state, then it must not be closed with CloseProtocol(). This is required
to guarantee the state of ControllerHandle is not modified by this function.
@param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
@param[in] ControllerHandle The handle of the controller to test. This handle
must support a protocol interface that supplies
an I/O abstraction to the driver.
@param[in] RemainingDevicePath A pointer to the remaining portion of a device path. This
parameter is ignored by device drivers, and is optional for bus
drivers. For bus drivers, if this parameter is not NULL, then
the bus driver must determine if the bus controller specified
by ControllerHandle and the child controller specified
by RemainingDevicePath are both supported by this
bus driver.
@retval EFI_SUCCESS The device specified by ControllerHandle and
RemainingDevicePath is supported by the driver specified by This.
@retval EFI_ALREADY_STARTED The device specified by ControllerHandle and
RemainingDevicePath is already being managed by the driver
specified by This.
@retval EFI_ACCESS_DENIED The device specified by ControllerHandle and
RemainingDevicePath is already being managed by a different
driver or an application that requires exclusive access.
@retval EFI_UNSUPPORTED The device specified by ControllerHandle and
RemainingDevicePath is not supported by the driver specified by This.
**/
EFI_STATUS
EFIAPI
Ext4IsBindingSupported (
IN EFI_DRIVER_BINDING_PROTOCOL *BindingProtocol,
IN EFI_HANDLE ControllerHandle,
IN EFI_DEVICE_PATH *RemainingDevicePath OPTIONAL
)
{
EFI_STATUS Status;
EFI_DISK_IO_PROTOCOL *DiskIo;
EFI_BLOCK_IO_PROTOCOL *BlockIo;
DiskIo = NULL;
BlockIo = NULL;
//
// Open the IO Abstraction(s) needed to perform the supported test
//
Status = gBS->OpenProtocol (
ControllerHandle,
&gEfiDiskIoProtocolGuid,
(VOID **)&DiskIo,
BindingProtocol->DriverBindingHandle,
ControllerHandle,
EFI_OPEN_PROTOCOL_BY_DRIVER
);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Open the IO Abstraction(s) needed to perform the supported test
//
Status = gBS->OpenProtocol (
ControllerHandle,
&gEfiBlockIoProtocolGuid,
(VOID **)&BlockIo,
BindingProtocol->DriverBindingHandle,
ControllerHandle,
EFI_OPEN_PROTOCOL_GET_PROTOCOL
);
if (!EFI_ERROR (Status)) {
if (!Ext4SuperblockCheckMagic (DiskIo, BlockIo)) {
Status = EFI_UNSUPPORTED;
}
}
//
// Close the I/O Abstraction(s) used to perform the supported test
//
if (DiskIo != NULL) {
gBS->CloseProtocol (
ControllerHandle,
&gEfiDiskIoProtocolGuid,
BindingProtocol->DriverBindingHandle,
ControllerHandle
);
}
if (BlockIo != NULL) {
gBS->CloseProtocol (
ControllerHandle,
&gEfiBlockIoProtocolGuid,
BindingProtocol->DriverBindingHandle,
ControllerHandle
);
}
return Status;
}
/**
Starts a device controller or a bus controller.
The Start() function is designed to be invoked from the EFI boot service ConnectController().
As a result, much of the error checking on the parameters to Start() has been moved into this
common boot service. It is legal to call Start() from other locations,
but the following calling restrictions must be followed, or the system behavior will not be deterministic.
1. ControllerHandle must be a valid EFI_HANDLE.
2. If RemainingDevicePath is not NULL, then it must be a pointer to a naturally aligned
EFI_DEVICE_PATH_PROTOCOL.
3. Prior to calling Start(), the Supported() function for the driver specified by This must
have been called with the same calling parameters, and Supported() must have returned EFI_SUCCESS.
@param[in] This A pointer to the EFI_DRIVER_BINDING_PROTOCOL instance.
@param[in] ControllerHandle The handle of the controller to start. This handle
must support a protocol interface that supplies
an I/O abstraction to the driver.
@param[in] RemainingDevicePath A pointer to the remaining portion of a device path. This
parameter is ignored by device drivers, and is optional for bus
drivers. For a bus driver, if this parameter is NULL, then handles
for all the children of Controller are created by this driver.
If this parameter is not NULL and the first Device Path Node is
not the End of Device Path Node, then only the handle for the
child device specified by the first Device Path Node of
RemainingDevicePath is created by this driver.
If the first Device Path Node of RemainingDevicePath is
the End of Device Path Node, no child handle is created by this
driver.
@retval EFI_SUCCESS The device was started.
@retval EFI_DEVICE_ERROR The device could not be started due to a device error.Currently not implemented.
@retval EFI_OUT_OF_RESOURCES The request could not be completed due to a lack of resources.
@retval Others The driver failded to start the device.
**/
EFI_STATUS
EFIAPI
Ext4Bind (
IN EFI_DRIVER_BINDING_PROTOCOL *BindingProtocol,
IN EFI_HANDLE ControllerHandle,
IN EFI_DEVICE_PATH *RemainingDevicePath OPTIONAL
)
{
EFI_DISK_IO_PROTOCOL *DiskIo;
EFI_DISK_IO2_PROTOCOL *DiskIo2;
EFI_BLOCK_IO_PROTOCOL *BlockIo;
EFI_STATUS Status;
DiskIo2 = NULL;
BlockIo = NULL;
DiskIo = NULL;
// Note: We initialize collation here since this is called in BDS, when we are likely
// to have the Unicode Collation protocols available.
Status = Ext4InitialiseUnicodeCollation (BindingProtocol->ImageHandle);
if (EFI_ERROR (Status)) {
// Lets throw a loud error into the log
// It is very unlikely something like this may fire out of the blue. Chances are either
// the platform configuration is wrong, or we are.
DEBUG ((DEBUG_ERROR, "[ext4] Error: Unicode Collation not available - failure to Start() - error %r\n", Status));
goto Error;
}
Status = gBS->OpenProtocol (
ControllerHandle,
&gEfiDiskIoProtocolGuid,
(VOID **)&DiskIo,
BindingProtocol->ImageHandle,
ControllerHandle,
EFI_OPEN_PROTOCOL_BY_DRIVER
);
if (EFI_ERROR (Status)) {
goto Error;
}
DEBUG ((DEBUG_INFO, "[ext4] Controller supports DISK_IO\n"));
Status = gBS->OpenProtocol (
ControllerHandle,
&gEfiDiskIo2ProtocolGuid,
(VOID **)&DiskIo2,
BindingProtocol->ImageHandle,
ControllerHandle,
EFI_OPEN_PROTOCOL_BY_DRIVER
);
// It's okay to not support DISK_IO2
if (DiskIo2 != NULL) {
DEBUG ((DEBUG_INFO, "[ext4] Controller supports DISK_IO2\n"));
}
Status = gBS->OpenProtocol (
ControllerHandle,
&gEfiBlockIoProtocolGuid,
(VOID **)&BlockIo,
BindingProtocol->ImageHandle,
ControllerHandle,
EFI_OPEN_PROTOCOL_GET_PROTOCOL
);
if (EFI_ERROR (Status)) {
goto Error;
}
Status = Ext4OpenPartition (ControllerHandle, DiskIo, DiskIo2, BlockIo);
if (EFI_ERROR (Status)) {
DEBUG ((DEBUG_ERROR, "[ext4] Error mounting: %r\n", Status));
// Falls through to Error
} else {
return Status;
}
Error:
if (DiskIo) {
gBS->CloseProtocol (
ControllerHandle,
&gEfiDiskIoProtocolGuid,
BindingProtocol->ImageHandle,
ControllerHandle
);
}
if (DiskIo2) {
gBS->CloseProtocol (
ControllerHandle,
&gEfiDiskIo2ProtocolGuid,
BindingProtocol->ImageHandle,
ControllerHandle
);
}
if (BlockIo) {
gBS->CloseProtocol (
ControllerHandle,
&gEfiBlockIoProtocolGuid,
BindingProtocol->ImageHandle,
ControllerHandle
);
}
return Status;
}
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