MdeModulePkg/Bus/Isa/IsaBusDxe/IsaBusDxe.c - edk2 - Git at Google

 /** @file
   This file consumes the ISA Host Controller protocol produced by the ISA Host
   Controller and installs the ISA Host Controller Service Binding protocol
   on the ISA Host Controller's handle.

   Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>
   SPDX-License-Identifier: BSD-2-Clause-Patent


 **/

 #include "IsaBusDxe.h"
 #include "ComponentName.h"

 /**
   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.

   @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
 IsaBusDriverBindingSupported (
   IN EFI_DRIVER_BINDING_PROTOCOL  *This,
   IN EFI_HANDLE                   Controller,
   IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
   )
 {
   EFI_STATUS  Status;
   VOID        *Instance;

   Status = gBS->OpenProtocol (
                   Controller,
                   &gEfiIsaHcProtocolGuid,
                   &Instance,
                   This->DriverBindingHandle,
                   Controller,
                   EFI_OPEN_PROTOCOL_BY_DRIVER
                   );
   if (!EFI_ERROR (Status)) {
     gBS->CloseProtocol (
            Controller,
            &gEfiIsaHcProtocolGuid,
            This->DriverBindingHandle,
            Controller
            );
   }

   if (EFI_ERROR (Status)) {
     return Status;
   }

   Status = gBS->OpenProtocol (
                   Controller,
                   &gEfiDevicePathProtocolGuid,
                   &Instance,
                   This->DriverBindingHandle,
                   Controller,
                   EFI_OPEN_PROTOCOL_BY_DRIVER
                   );
   if (!EFI_ERROR (Status)) {
     gBS->CloseProtocol (
            Controller,
            &gEfiDevicePathProtocolGuid,
            This->DriverBindingHandle,
            Controller
            );
   }

   return Status;
 }

 ISA_BUS_CHILD_PRIVATE_DATA  mIsaBusChildPrivateTemplate = {
   ISA_BUS_CHILD_PRIVATE_DATA_SIGNATURE,
   FALSE
 };

 /**
   Creates a child handle and installs a protocol.

   The CreateChild() function installs a protocol on ChildHandle.
   If ChildHandle is a pointer to NULL, then a new handle is created and returned in ChildHandle.
   If ChildHandle is not a pointer to NULL, then the protocol installs on the existing ChildHandle.

   @param  This        Pointer to the EFI_SERVICE_BINDING_PROTOCOL instance.
   @param  ChildHandle Pointer to the handle of the child to create. If it is NULL,
                       then a new handle is created. If it is a pointer to an existing UEFI handle,
                       then the protocol is added to the existing UEFI handle.

   @retval EFI_SUCCESS           The protocol was added to ChildHandle.
   @retval EFI_INVALID_PARAMETER ChildHandle is NULL.
   @retval EFI_OUT_OF_RESOURCES  There are not enough resources available to create
                                 the child
   @retval other                 The child handle was not created

 **/
 EFI_STATUS
 EFIAPI
 IsaBusCreateChild (
   IN     EFI_SERVICE_BINDING_PROTOCOL  *This,
   IN OUT EFI_HANDLE                    *ChildHandle
   )
 {
   EFI_STATUS                  Status;
   ISA_BUS_PRIVATE_DATA        *Private;
   EFI_ISA_HC_PROTOCOL         *IsaHc;
   ISA_BUS_CHILD_PRIVATE_DATA  *Child;

   Private = ISA_BUS_PRIVATE_DATA_FROM_THIS (This);

   Child = AllocateCopyPool (sizeof (mIsaBusChildPrivateTemplate), &mIsaBusChildPrivateTemplate);
   if (Child == NULL) {
     return EFI_OUT_OF_RESOURCES;
   }

   Status = gBS->InstallMultipleProtocolInterfaces (
                   ChildHandle,
                   &gEfiIsaHcProtocolGuid,
                   Private->IsaHc,
                   &gEfiCallerIdGuid,
                   Child,
                   NULL
                   );
   if (EFI_ERROR (Status)) {
     FreePool (Child);
     return Status;
   }

   return gBS->OpenProtocol (
                 Private->IsaHcHandle,
                 &gEfiIsaHcProtocolGuid,
                 (VOID **)&IsaHc,
                 gIsaBusDriverBinding.DriverBindingHandle,
                 *ChildHandle,
                 EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
                 );
 }

 /**
   Destroys a child handle with a protocol installed on it.

   The DestroyChild() function does the opposite of CreateChild(). It removes a protocol
   that was installed by CreateChild() from ChildHandle. If the removed protocol is the
   last protocol on ChildHandle, then ChildHandle is destroyed.

   @param  This        Pointer to the EFI_SERVICE_BINDING_PROTOCOL instance.
   @param  ChildHandle Handle of the child to destroy

   @retval EFI_SUCCESS           The protocol was removed from ChildHandle.
   @retval EFI_UNSUPPORTED       ChildHandle does not support the protocol that is being removed.
   @retval EFI_INVALID_PARAMETER Child handle is NULL.
   @retval EFI_ACCESS_DENIED     The protocol could not be removed from the ChildHandle
                                 because its services are being used.
   @retval other                 The child handle was not destroyed

 **/
 EFI_STATUS
 EFIAPI
 IsaBusDestroyChild (
   IN EFI_SERVICE_BINDING_PROTOCOL  *This,
   IN EFI_HANDLE                    ChildHandle
   )
 {
   EFI_STATUS                  Status;
   ISA_BUS_PRIVATE_DATA        *Private;
   EFI_ISA_HC_PROTOCOL         *IsaHc;
   ISA_BUS_CHILD_PRIVATE_DATA  *Child;

   Private = ISA_BUS_PRIVATE_DATA_FROM_THIS (This);

   Status = gBS->OpenProtocol (
                   ChildHandle,
                   &gEfiCallerIdGuid,
                   (VOID **)&Child,
                   gIsaBusDriverBinding.DriverBindingHandle,
                   ChildHandle,
                   EFI_OPEN_PROTOCOL_GET_PROTOCOL
                   );
   if (EFI_ERROR (Status)) {
     return Status;
   }

   ASSERT (Child->Signature == ISA_BUS_CHILD_PRIVATE_DATA_SIGNATURE);

   if (Child->InDestroying) {
     return EFI_SUCCESS;
   }

   Child->InDestroying = TRUE;
   Status              = gBS->CloseProtocol (
                                Private->IsaHcHandle,
                                &gEfiIsaHcProtocolGuid,
                                gIsaBusDriverBinding.DriverBindingHandle,
                                ChildHandle
                                );
   ASSERT_EFI_ERROR (Status);
   if (!EFI_ERROR (Status)) {
     Status = gBS->UninstallMultipleProtocolInterfaces (
                     ChildHandle,
                     &gEfiIsaHcProtocolGuid,
                     Private->IsaHc,
                     &gEfiCallerIdGuid,
                     Child,
                     NULL
                     );
     if (EFI_ERROR (Status)) {
       gBS->OpenProtocol (
              Private->IsaHcHandle,
              &gEfiIsaHcProtocolGuid,
              (VOID **)&IsaHc,
              gIsaBusDriverBinding.DriverBindingHandle,
              ChildHandle,
              EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
              );
     }
   }

   if (EFI_ERROR (Status)) {
     Child->InDestroying = FALSE;
   } else {
     FreePool (Child);
   }

   return Status;
 }

 ISA_BUS_PRIVATE_DATA  mIsaBusPrivateTemplate = {
   ISA_BUS_PRIVATE_DATA_SIGNATURE,
   {
     IsaBusCreateChild,
     IsaBusDestroyChild
   }
 };

 /**
   Starts a device controller or a bus controller.

   @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 failed to start the device.

 **/
 EFI_STATUS
 EFIAPI
 IsaBusDriverBindingStart (
   IN EFI_DRIVER_BINDING_PROTOCOL  *This,
   IN EFI_HANDLE                   Controller,
   IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
   )
 {
   EFI_STATUS                Status;
   EFI_DEVICE_PATH_PROTOCOL  *DevicePath;
   ISA_BUS_PRIVATE_DATA      *Private;

   Status = gBS->OpenProtocol (
                   Controller,
                   &gEfiIsaHcProtocolGuid,
                   (VOID **)&mIsaBusPrivateTemplate.IsaHc,
                   This->DriverBindingHandle,
                   Controller,
                   EFI_OPEN_PROTOCOL_BY_DRIVER
                   );
   if (EFI_ERROR (Status)) {
     return Status;
   }

   Status = gBS->OpenProtocol (
                   Controller,
                   &gEfiDevicePathProtocolGuid,
                   (VOID **)&DevicePath,
                   This->DriverBindingHandle,
                   Controller,
                   EFI_OPEN_PROTOCOL_BY_DRIVER
                   );
   if (EFI_ERROR (Status)) {
     gBS->CloseProtocol (
            Controller,
            &gEfiIsaHcProtocolGuid,
            This->DriverBindingHandle,
            Controller
            );
     return Status;
   }

   Private = AllocateCopyPool (sizeof (mIsaBusPrivateTemplate), &mIsaBusPrivateTemplate);
   ASSERT (Private != NULL);

   Private->IsaHcHandle = Controller;

   Status = gBS->InstallMultipleProtocolInterfaces (
                   &Controller,
                   &gEfiIsaHcServiceBindingProtocolGuid,
                   &Private->ServiceBinding,
                   NULL
                   );
   ASSERT_EFI_ERROR (Status);

   return Status;
 }

 /**
   Stops a device controller or a bus 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
 IsaBusDriverBindingStop (
   IN  EFI_DRIVER_BINDING_PROTOCOL  *This,
   IN  EFI_HANDLE                   Controller,
   IN  UINTN                        NumberOfChildren,
   IN  EFI_HANDLE                   *ChildHandleBuffer
   )
 {
   EFI_STATUS                    Status;
   EFI_SERVICE_BINDING_PROTOCOL  *ServiceBinding;
   ISA_BUS_PRIVATE_DATA          *Private;
   UINTN                         Index;
   BOOLEAN                       AllChildrenStopped;

   Status = gBS->OpenProtocol (
                   Controller,
                   &gEfiIsaHcServiceBindingProtocolGuid,
                   (VOID **)&ServiceBinding,
                   This->DriverBindingHandle,
                   Controller,
                   EFI_OPEN_PROTOCOL_GET_PROTOCOL
                   );
   if (EFI_ERROR (Status)) {
     return Status;
   }

   Private = ISA_BUS_PRIVATE_DATA_FROM_THIS (ServiceBinding);

   if (NumberOfChildren == 0) {
     Status = gBS->UninstallMultipleProtocolInterfaces (
                     Controller,
                     &gEfiIsaHcServiceBindingProtocolGuid,
                     &Private->ServiceBinding,
                     NULL
                     );
     if (!EFI_ERROR (Status)) {
       gBS->CloseProtocol (
              Controller,
              &gEfiDevicePathProtocolGuid,
              This->DriverBindingHandle,
              Controller
              );
       gBS->CloseProtocol (
              Controller,
              &gEfiIsaHcProtocolGuid,
              This->DriverBindingHandle,
              Controller
              );
       FreePool (Private);
     }

     return Status;
   }

   AllChildrenStopped = TRUE;
   for (Index = 0; Index < NumberOfChildren; Index++) {
     Status = ServiceBinding->DestroyChild (ServiceBinding, ChildHandleBuffer[Index]);
     if (EFI_ERROR (Status)) {
       AllChildrenStopped = FALSE;
     }
   }

   return AllChildrenStopped ? EFI_SUCCESS : EFI_DEVICE_ERROR;
 }

 //
 // ISA Bus Driver Binding Protocol Instance
 //
 EFI_DRIVER_BINDING_PROTOCOL  gIsaBusDriverBinding = {
   IsaBusDriverBindingSupported,
   IsaBusDriverBindingStart,
   IsaBusDriverBindingStop,
   0x10,
   NULL,
   NULL
 };

 /**
   Entry point of the IsaBusDxe driver.

   @param[in] ImageHandle    The firmware allocated handle for the EFI image.
   @param[in] SystemTable    A pointer to the EFI System Table.

   @retval EFI_SUCCESS       The entry point is executed successfully.
   @retval other             Some error occurs when executing this entry point.
 **/
 EFI_STATUS
 EFIAPI
 InitializeIsaBus (
   IN EFI_HANDLE        ImageHandle,
   IN EFI_SYSTEM_TABLE  *SystemTable
   )
 {
   EFI_STATUS  Status;

   Status = EfiLibInstallDriverBindingComponentName2 (
              ImageHandle,
              SystemTable,
              &gIsaBusDriverBinding,
              ImageHandle,
              &gIsaBusComponentName,
              &gIsaBusComponentName2
              );
   ASSERT_EFI_ERROR (Status);
   return Status;
 }
	/** @file
	This file consumes the ISA Host Controller protocol produced by the ISA Host
	Controller and installs the ISA Host Controller Service Binding protocol
	on the ISA Host Controller's handle.

	Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>
	SPDX-License-Identifier: BSD-2-Clause-Patent


	**/

	#include "IsaBusDxe.h"
	#include "ComponentName.h"

	/**
	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.

	@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
	IsaBusDriverBindingSupported (
	IN EFI_DRIVER_BINDING_PROTOCOL *This,
	IN EFI_HANDLE Controller,
	IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
	)
	{
	EFI_STATUS Status;
	VOID *Instance;

	Status = gBS->OpenProtocol (
	Controller,
	&gEfiIsaHcProtocolGuid,
	&Instance,
	This->DriverBindingHandle,
	Controller,
	EFI_OPEN_PROTOCOL_BY_DRIVER
	);
	if (!EFI_ERROR (Status)) {
	gBS->CloseProtocol (
	Controller,
	&gEfiIsaHcProtocolGuid,
	This->DriverBindingHandle,
	Controller
	);
	}

	if (EFI_ERROR (Status)) {
	return Status;
	}

	Status = gBS->OpenProtocol (
	Controller,
	&gEfiDevicePathProtocolGuid,
	&Instance,
	This->DriverBindingHandle,
	Controller,
	EFI_OPEN_PROTOCOL_BY_DRIVER
	);
	if (!EFI_ERROR (Status)) {
	gBS->CloseProtocol (
	Controller,
	&gEfiDevicePathProtocolGuid,
	This->DriverBindingHandle,
	Controller
	);
	}

	return Status;
	}

	ISA_BUS_CHILD_PRIVATE_DATA mIsaBusChildPrivateTemplate = {
	ISA_BUS_CHILD_PRIVATE_DATA_SIGNATURE,
	FALSE
	};

	/**
	Creates a child handle and installs a protocol.

	The CreateChild() function installs a protocol on ChildHandle.
	If ChildHandle is a pointer to NULL, then a new handle is created and returned in ChildHandle.
	If ChildHandle is not a pointer to NULL, then the protocol installs on the existing ChildHandle.

	@param This Pointer to the EFI_SERVICE_BINDING_PROTOCOL instance.
	@param ChildHandle Pointer to the handle of the child to create. If it is NULL,
	then a new handle is created. If it is a pointer to an existing UEFI handle,
	then the protocol is added to the existing UEFI handle.

	@retval EFI_SUCCESS The protocol was added to ChildHandle.
	@retval EFI_INVALID_PARAMETER ChildHandle is NULL.
	@retval EFI_OUT_OF_RESOURCES There are not enough resources available to create
	the child
	@retval other The child handle was not created

	**/
	EFI_STATUS
	EFIAPI
	IsaBusCreateChild (
	IN EFI_SERVICE_BINDING_PROTOCOL *This,
	IN OUT EFI_HANDLE *ChildHandle
	)
	{
	EFI_STATUS Status;
	ISA_BUS_PRIVATE_DATA *Private;
	EFI_ISA_HC_PROTOCOL *IsaHc;
	ISA_BUS_CHILD_PRIVATE_DATA *Child;

	Private = ISA_BUS_PRIVATE_DATA_FROM_THIS (This);

	Child = AllocateCopyPool (sizeof (mIsaBusChildPrivateTemplate), &mIsaBusChildPrivateTemplate);
	if (Child == NULL) {
	return EFI_OUT_OF_RESOURCES;
	}

	Status = gBS->InstallMultipleProtocolInterfaces (
	ChildHandle,
	&gEfiIsaHcProtocolGuid,
	Private->IsaHc,
	&gEfiCallerIdGuid,
	Child,
	NULL
	);
	if (EFI_ERROR (Status)) {
	FreePool (Child);
	return Status;
	}

	return gBS->OpenProtocol (
	Private->IsaHcHandle,
	&gEfiIsaHcProtocolGuid,
	(VOID **)&IsaHc,
	gIsaBusDriverBinding.DriverBindingHandle,
	*ChildHandle,
	EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
	);
	}

	/**
	Destroys a child handle with a protocol installed on it.

	The DestroyChild() function does the opposite of CreateChild(). It removes a protocol
	that was installed by CreateChild() from ChildHandle. If the removed protocol is the
	last protocol on ChildHandle, then ChildHandle is destroyed.

	@param This Pointer to the EFI_SERVICE_BINDING_PROTOCOL instance.
	@param ChildHandle Handle of the child to destroy

	@retval EFI_SUCCESS The protocol was removed from ChildHandle.
	@retval EFI_UNSUPPORTED ChildHandle does not support the protocol that is being removed.
	@retval EFI_INVALID_PARAMETER Child handle is NULL.
	@retval EFI_ACCESS_DENIED The protocol could not be removed from the ChildHandle
	because its services are being used.
	@retval other The child handle was not destroyed

	**/
	EFI_STATUS
	EFIAPI
	IsaBusDestroyChild (
	IN EFI_SERVICE_BINDING_PROTOCOL *This,
	IN EFI_HANDLE ChildHandle
	)
	{
	EFI_STATUS Status;
	ISA_BUS_PRIVATE_DATA *Private;
	EFI_ISA_HC_PROTOCOL *IsaHc;
	ISA_BUS_CHILD_PRIVATE_DATA *Child;

	Private = ISA_BUS_PRIVATE_DATA_FROM_THIS (This);

	Status = gBS->OpenProtocol (
	ChildHandle,
	&gEfiCallerIdGuid,
	(VOID **)&Child,
	gIsaBusDriverBinding.DriverBindingHandle,
	ChildHandle,
	EFI_OPEN_PROTOCOL_GET_PROTOCOL
	);
	if (EFI_ERROR (Status)) {
	return Status;
	}

	ASSERT (Child->Signature == ISA_BUS_CHILD_PRIVATE_DATA_SIGNATURE);

	if (Child->InDestroying) {
	return EFI_SUCCESS;
	}

	Child->InDestroying = TRUE;
	Status = gBS->CloseProtocol (
	Private->IsaHcHandle,
	&gEfiIsaHcProtocolGuid,
	gIsaBusDriverBinding.DriverBindingHandle,
	ChildHandle
	);
	ASSERT_EFI_ERROR (Status);
	if (!EFI_ERROR (Status)) {
	Status = gBS->UninstallMultipleProtocolInterfaces (
	ChildHandle,
	&gEfiIsaHcProtocolGuid,
	Private->IsaHc,
	&gEfiCallerIdGuid,
	Child,
	NULL
	);
	if (EFI_ERROR (Status)) {
	gBS->OpenProtocol (
	Private->IsaHcHandle,
	&gEfiIsaHcProtocolGuid,
	(VOID **)&IsaHc,
	gIsaBusDriverBinding.DriverBindingHandle,
	ChildHandle,
	EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER
	);
	}
	}

	if (EFI_ERROR (Status)) {
	Child->InDestroying = FALSE;
	} else {
	FreePool (Child);
	}

	return Status;
	}

	ISA_BUS_PRIVATE_DATA mIsaBusPrivateTemplate = {
	ISA_BUS_PRIVATE_DATA_SIGNATURE,
	{
	IsaBusCreateChild,
	IsaBusDestroyChild
	}
	};

	/**
	Starts a device controller or a bus controller.

	@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 failed to start the device.

	**/
	EFI_STATUS
	EFIAPI
	IsaBusDriverBindingStart (
	IN EFI_DRIVER_BINDING_PROTOCOL *This,
	IN EFI_HANDLE Controller,
	IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
	)
	{
	EFI_STATUS Status;
	EFI_DEVICE_PATH_PROTOCOL *DevicePath;
	ISA_BUS_PRIVATE_DATA *Private;

	Status = gBS->OpenProtocol (
	Controller,
	&gEfiIsaHcProtocolGuid,
	(VOID **)&mIsaBusPrivateTemplate.IsaHc,
	This->DriverBindingHandle,
	Controller,
	EFI_OPEN_PROTOCOL_BY_DRIVER
	);
	if (EFI_ERROR (Status)) {
	return Status;
	}

	Status = gBS->OpenProtocol (
	Controller,
	&gEfiDevicePathProtocolGuid,
	(VOID **)&DevicePath,
	This->DriverBindingHandle,
	Controller,
	EFI_OPEN_PROTOCOL_BY_DRIVER
	);
	if (EFI_ERROR (Status)) {
	gBS->CloseProtocol (
	Controller,
	&gEfiIsaHcProtocolGuid,
	This->DriverBindingHandle,
	Controller
	);
	return Status;
	}

	Private = AllocateCopyPool (sizeof (mIsaBusPrivateTemplate), &mIsaBusPrivateTemplate);
	ASSERT (Private != NULL);

	Private->IsaHcHandle = Controller;

	Status = gBS->InstallMultipleProtocolInterfaces (
	&Controller,
	&gEfiIsaHcServiceBindingProtocolGuid,
	&Private->ServiceBinding,
	NULL
	);
	ASSERT_EFI_ERROR (Status);

	return Status;
	}

	/**
	Stops a device controller or a bus 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
	IsaBusDriverBindingStop (
	IN EFI_DRIVER_BINDING_PROTOCOL *This,
	IN EFI_HANDLE Controller,
	IN UINTN NumberOfChildren,
	IN EFI_HANDLE *ChildHandleBuffer
	)
	{
	EFI_STATUS Status;
	EFI_SERVICE_BINDING_PROTOCOL *ServiceBinding;
	ISA_BUS_PRIVATE_DATA *Private;
	UINTN Index;
	BOOLEAN AllChildrenStopped;

	Status = gBS->OpenProtocol (
	Controller,
	&gEfiIsaHcServiceBindingProtocolGuid,
	(VOID **)&ServiceBinding,
	This->DriverBindingHandle,
	Controller,
	EFI_OPEN_PROTOCOL_GET_PROTOCOL
	);
	if (EFI_ERROR (Status)) {
	return Status;
	}

	Private = ISA_BUS_PRIVATE_DATA_FROM_THIS (ServiceBinding);

	if (NumberOfChildren == 0) {
	Status = gBS->UninstallMultipleProtocolInterfaces (
	Controller,
	&gEfiIsaHcServiceBindingProtocolGuid,
	&Private->ServiceBinding,
	NULL
	);
	if (!EFI_ERROR (Status)) {
	gBS->CloseProtocol (
	Controller,
	&gEfiDevicePathProtocolGuid,
	This->DriverBindingHandle,
	Controller
	);
	gBS->CloseProtocol (
	Controller,
	&gEfiIsaHcProtocolGuid,
	This->DriverBindingHandle,
	Controller
	);
	FreePool (Private);
	}

	return Status;
	}

	AllChildrenStopped = TRUE;
	for (Index = 0; Index < NumberOfChildren; Index++) {
	Status = ServiceBinding->DestroyChild (ServiceBinding, ChildHandleBuffer[Index]);
	if (EFI_ERROR (Status)) {
	AllChildrenStopped = FALSE;
	}
	}

	return AllChildrenStopped ? EFI_SUCCESS : EFI_DEVICE_ERROR;
	}

	//
	// ISA Bus Driver Binding Protocol Instance
	//
	EFI_DRIVER_BINDING_PROTOCOL gIsaBusDriverBinding = {
	IsaBusDriverBindingSupported,
	IsaBusDriverBindingStart,
	IsaBusDriverBindingStop,
	0x10,
	NULL,
	NULL
	};

	/**
	Entry point of the IsaBusDxe driver.

	@param[in] ImageHandle The firmware allocated handle for the EFI image.
	@param[in] SystemTable A pointer to the EFI System Table.

	@retval EFI_SUCCESS The entry point is executed successfully.
	@retval other Some error occurs when executing this entry point.
	**/
	EFI_STATUS
	EFIAPI
	InitializeIsaBus (
	IN EFI_HANDLE ImageHandle,
	IN EFI_SYSTEM_TABLE *SystemTable
	)
	{
	EFI_STATUS Status;

	Status = EfiLibInstallDriverBindingComponentName2 (
	ImageHandle,
	SystemTable,
	&gIsaBusDriverBinding,
	ImageHandle,
	&gIsaBusComponentName,
	&gIsaBusComponentName2
	);
	ASSERT_EFI_ERROR (Status);
	return Status;
	}