OvmfPkg/BlockMmioToBlockIoDxe/BlockIo.c - third_party/edk2 - Git at Google

 /** @file
   The driver wrappers BlockMmio protocol instances to produce
   Block I/O Protocol instances.

   Copyright (c) 2007 - 2012, Intel Corporation. All rights reserved.<BR>
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
   which accompanies this distribution.  The full text of the license may be found at
   http://opensource.org/licenses/bsd-license.php

   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

 **/

 #include "BlockIo.h"

 EFI_DRIVER_BINDING_PROTOCOL gBlockIoDriverBinding = {
   BlockIoDriverBindingSupported,
   BlockIoDriverBindingStart,
   BlockIoDriverBindingStop,
   0x11,
   NULL,
   NULL
 };

 /**
   Reset the block device.

   This function implements EFI_BLOCK_IO_PROTOCOL.Reset().
   It resets the block device hardware.
   ExtendedVerification is ignored in this implementation.

   @param  This                   Indicates a pointer to the calling context.
   @param  ExtendedVerification   Indicates that the driver may perform a more exhaustive
                                  verification operation of the device during reset.

   @retval EFI_SUCCESS            The block device was reset.
   @retval EFI_DEVICE_ERROR       The block device is not functioning correctly and could not be reset.

 **/
 EFI_STATUS
 EFIAPI
 BlockIoReset (
   IN EFI_BLOCK_IO_PROTOCOL    *This,
   IN BOOLEAN                  ExtendedVerification
   )
 {
   return EFI_SUCCESS;
 }

 /**
   Reads the requested number of blocks from the device.

   This function implements EFI_BLOCK_IO_PROTOCOL.ReadBlocks().
   It reads the requested number of blocks from the device.
   All the blocks are read, or an error is returned.

   @param  This                   Indicates a pointer to the calling context.
   @param  ReadData               If TRUE then read data.  If FALSE then write data.
   @param  MediaId                The media ID that the read request is for.
   @param  Lba                    The starting logical block address to read from on the device.
   @param  BufferSize             The size of the Buffer in bytes.
                                  This must be a multiple of the intrinsic block size of the device.
   @param  Buffer                 A pointer to the destination buffer for the data. The caller is
                                  responsible for either having implicit or explicit ownership of the buffer.

   @retval EFI_SUCCESS            The data was read correctly from the device.
   @retval EFI_DEVICE_ERROR       The device reported an error while attempting to perform the read operation.
   @retval EFI_NO_MEDIA           There is no media in the device.
   @retval EFI_MEDIA_CHANGED      The MediaId is not for the current media.
   @retval EFI_BAD_BUFFER_SIZE    The BufferSize parameter is not a multiple of the intrinsic block size of the device.
   @retval EFI_INVALID_PARAMETER  The read request contains LBAs that are not valid,
                                  or the buffer is not on proper alignment.

 **/
 EFI_STATUS
 EFIAPI
 ReadOrWriteBlocks (
   IN EFI_BLOCK_IO_PROTOCOL    *This,
   IN BOOLEAN                  ReadData,
   IN UINT32                   MediaId,
   IN EFI_LBA                  Lba,
   IN UINTN                    BufferSize,
   OUT VOID                    *Buffer
   )
 {
   EFI_STATUS                    Status;
   BLOCK_MMIO_TO_BLOCK_IO_DEVICE *Private;
   UINTN                         TotalBlock;
   EFI_BLOCK_IO_MEDIA            *Media;
   UINT64                        Address;
   UINTN                         Count;
   EFI_CPU_IO_PROTOCOL_IO_MEM    CpuAccessFunction;

   //
   // First, validate the parameters
   //
   if ((Buffer == NULL) || (BufferSize == 0)) {
     return EFI_INVALID_PARAMETER;
   }

   //
   // Get private data structure
   //
   Private = PRIVATE_FROM_BLOCK_IO (This);
   Media   = Private->BlockMmio->Media;

   //
   // BufferSize must be a multiple of the intrinsic block size of the device.
   //
   if (ModU64x32 (BufferSize, Media->BlockSize) != 0) {
     return EFI_BAD_BUFFER_SIZE;
   }

   TotalBlock = (UINTN) DivU64x32 (BufferSize, Media->BlockSize);

   //
   // Make sure the range to read is valid.
   //
   if (Lba + TotalBlock - 1 > Media->LastBlock) {
     return EFI_INVALID_PARAMETER;
   }

   if (!(Media->MediaPresent)) {
     return EFI_NO_MEDIA;
   }

   if (MediaId != Media->MediaId) {
     return EFI_MEDIA_CHANGED;
   }

   Address = Private->BlockMmio->BaseAddress;
   Address += MultU64x32 (Lba, Media->BlockSize);

   Count = BufferSize >> 3;

   if (ReadData) {
     CpuAccessFunction = Private->CpuIo->Mem.Read;
   } else {
     CpuAccessFunction = Private->CpuIo->Mem.Write;
   }

   Status = (CpuAccessFunction) (
              Private->CpuIo,
              EfiCpuIoWidthUint64,
              Address,
              Count,
              Buffer
              );

   return Status;
 }


 /**
   Reads the requested number of blocks from the device.

   This function implements EFI_BLOCK_IO_PROTOCOL.ReadBlocks().
   It reads the requested number of blocks from the device.
   All the blocks are read, or an error is returned.

   @param  This                   Indicates a pointer to the calling context.
   @param  MediaId                The media ID that the read request is for.
   @param  Lba                    The starting logical block address to read from on the device.
   @param  BufferSize             The size of the Buffer in bytes.
                                  This must be a multiple of the intrinsic block size of the device.
   @param  Buffer                 A pointer to the destination buffer for the data. The caller is
                                  responsible for either having implicit or explicit ownership of the buffer.

   @retval EFI_SUCCESS            The data was read correctly from the device.
   @retval EFI_DEVICE_ERROR       The device reported an error while attempting to perform the read operation.
   @retval EFI_NO_MEDIA           There is no media in the device.
   @retval EFI_MEDIA_CHANGED      The MediaId is not for the current media.
   @retval EFI_BAD_BUFFER_SIZE    The BufferSize parameter is not a multiple of the intrinsic block size of the device.
   @retval EFI_INVALID_PARAMETER  The read request contains LBAs that are not valid,
                                  or the buffer is not on proper alignment.

 **/
 EFI_STATUS
 EFIAPI
 BlockIoReadBlocks (
   IN EFI_BLOCK_IO_PROTOCOL    *This,
   IN UINT32                   MediaId,
   IN EFI_LBA                  Lba,
   IN UINTN                    BufferSize,
   OUT VOID                    *Buffer
   )
 {
   DEBUG ((EFI_D_INFO, "BlockIo (MMIO) ReadBlocks: lba=0x%Lx, size=0x%Lx\n",
     Lba, (UINT64)BufferSize));
   return ReadOrWriteBlocks (
     This,
     TRUE,
     MediaId,
     Lba,
     BufferSize,
     Buffer
     );
 }


 /**
   Writes a specified number of blocks to the device.

   This function implements EFI_BLOCK_IO_PROTOCOL.WriteBlocks().
   It writes a specified number of blocks to the device.
   All blocks are written, or an error is returned.

   @param  This                   Indicates a pointer to the calling context.
   @param  MediaId                The media ID that the write request is for.
   @param  Lba                    The starting logical block address to be written.
   @param  BufferSize             The size of the Buffer in bytes.
                                  This must be a multiple of the intrinsic block size of the device.
   @param  Buffer                 Pointer to the source buffer for the data.

   @retval EFI_SUCCESS            The data were written correctly to the device.
   @retval EFI_WRITE_PROTECTED    The device cannot be written to.
   @retval EFI_NO_MEDIA           There is no media in the device.
   @retval EFI_MEDIA_CHANGED      The MediaId is not for the current media.
   @retval EFI_DEVICE_ERROR       The device reported an error while attempting to perform the write operation.
   @retval EFI_BAD_BUFFER_SIZE    The BufferSize parameter is not a multiple of the intrinsic
                                  block size of the device.
   @retval EFI_INVALID_PARAMETER  The write request contains LBAs that are not valid,
                                  or the buffer is not on proper alignment.

 **/
 EFI_STATUS
 EFIAPI
 BlockIoWriteBlocks (
   IN EFI_BLOCK_IO_PROTOCOL    *This,
   IN UINT32                   MediaId,
   IN EFI_LBA                  Lba,
   IN UINTN                    BufferSize,
   IN VOID                     *Buffer
   )
 {
   DEBUG ((EFI_D_INFO, "BlockIo (MMIO) WriteBlocks: lba=0x%Lx, size=0x%Lx\n",
     Lba, (UINT64)BufferSize));
   return ReadOrWriteBlocks (
     This,
     FALSE,
     MediaId,
     Lba,
     BufferSize,
     Buffer
     );
 }

 /**
   Flushes all modified data to a physical block device.

   @param  This                   Indicates a pointer to the calling context.

   @retval EFI_SUCCESS            All outstanding data were written correctly to the device.
   @retval EFI_DEVICE_ERROR       The device reported an error while attempting to write data.
   @retval EFI_NO_MEDIA           There is no media in the device.

 **/
 EFI_STATUS
 EFIAPI
 BlockIoFlushBlocks (
   IN EFI_BLOCK_IO_PROTOCOL  *This
   )
 {
   return EFI_SUCCESS;
 }


 /**
   Initialize data for device that does not support multiple LUNSs.

   @param  This            The Driver Binding Protocol instance.
   @param  Controller      The device to initialize.
   @param  BlockMmio       Pointer to USB_MASS_TRANSPORT.
   @param  Context         Parameter for USB_MASS_DEVICE.Context.

   @retval EFI_SUCCESS     Initialization succeeds.
   @retval Other           Initialization fails.

 **/
 EFI_STATUS
 BlockIoInit (
   IN EFI_DRIVER_BINDING_PROTOCOL   *This,
   IN EFI_HANDLE                    Controller
   )
 {
   EFI_STATUS                     Status;
   BLOCK_MMIO_TO_BLOCK_IO_DEVICE  *Private;
   BLOCK_MMIO_PROTOCOL            *BlockMmio;

   Private = (BLOCK_MMIO_TO_BLOCK_IO_DEVICE*) AllocateZeroPool (sizeof (*Private));
   ASSERT (Private != NULL);

   Status = gBS->LocateProtocol (
                   &gEfiCpuIo2ProtocolGuid,
                   NULL,
                   (VOID **) &(Private->CpuIo)
                   );
   ASSERT_EFI_ERROR (Status);

   Status = gBS->OpenProtocol (
                   Controller,
                   &gBlockMmioProtocolGuid,
                   (VOID **) &BlockMmio,
                   This->DriverBindingHandle,
                   Controller,
                   EFI_OPEN_PROTOCOL_BY_DRIVER
                   );
   if (EFI_ERROR (Status)) {
     DEBUG ((EFI_D_ERROR, "BlockIoInit: OpenBlockMmioProtocol By Driver (%r)\n", Status));
     goto ON_ERROR;
   }
   DEBUG ((EFI_D_INFO, "BlockMmio: %p\n", BlockMmio));
   DEBUG ((EFI_D_INFO, "BlockMmio->Media->LastBlock: 0x%lx\n", BlockMmio->Media->LastBlock));

   Private->Signature            = BLOCK_MMIO_TO_BLOCK_IO_SIGNATURE;
   Private->Controller           = Controller;
   Private->BlockMmio            = BlockMmio;
   Private->BlockIo.Media        = BlockMmio->Media;
   Private->BlockIo.Reset        = BlockIoReset;
   Private->BlockIo.ReadBlocks   = BlockIoReadBlocks;
   Private->BlockIo.WriteBlocks  = BlockIoWriteBlocks;
   Private->BlockIo.FlushBlocks  = BlockIoFlushBlocks;

   DEBUG ((EFI_D_INFO, "Private->BlockIo.Media->LastBlock: 0x%lx\n", Private->BlockIo.Media->LastBlock));

   Status = gBS->InstallProtocolInterface (
                   &Controller,
                   &gEfiBlockIoProtocolGuid,
                   EFI_NATIVE_INTERFACE,
                   &Private->BlockIo
                   );
   if (EFI_ERROR (Status)) {
     goto ON_ERROR;
   }

   return EFI_SUCCESS;

 ON_ERROR:
   if (Private != NULL) {
     FreePool (Private);
   }
   if (BlockMmio != NULL) {
     gBS->CloseProtocol (
            Controller,
            &gBlockMmioProtocolGuid,
            This->DriverBindingHandle,
            Controller
            );
   }
   return Status;
 }


 /**
   Check whether the controller is a supported USB mass storage.

   @param  This                   The USB mass storage driver binding protocol.
   @param  Controller             The controller handle to check.
   @param  RemainingDevicePath    The remaining device path.

   @retval EFI_SUCCESS            The driver supports this controller.
   @retval other                  This device isn't supported.

 **/
 EFI_STATUS
 EFIAPI
 BlockIoDriverBindingSupported (
   IN EFI_DRIVER_BINDING_PROTOCOL  *This,
   IN EFI_HANDLE                   Controller,
   IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
   )
 {
   EFI_STATUS                    Status;
   BLOCK_MMIO_PROTOCOL           *BlockMmio;

   Status = gBS->OpenProtocol (
                   Controller,
                   &gBlockMmioProtocolGuid,
                   (VOID **) &BlockMmio,
                   This->DriverBindingHandle,
                   Controller,
                   EFI_OPEN_PROTOCOL_BY_DRIVER
                   );
   if (EFI_ERROR (Status)) {
     return Status;
   }

   gBS->CloseProtocol (
          Controller,
          &gBlockMmioProtocolGuid,
          This->DriverBindingHandle,
          Controller
          );

   return Status;
 }

 /**
   Starts the USB mass storage device with this driver.

   This function consumes USB I/O Portocol, intializes USB mass storage device,
   installs Block I/O Protocol, and submits Asynchronous Interrupt
   Transfer to manage the USB mass storage device.

   @param  This                  The USB mass storage driver binding protocol.
   @param  Controller            The USB mass storage device to start on
   @param  RemainingDevicePath   The remaining device path.

   @retval EFI_SUCCESS           This driver supports this device.
   @retval EFI_UNSUPPORTED       This driver does not support this device.
   @retval EFI_DEVICE_ERROR      This driver cannot be started due to device Error.
   @retval EFI_OUT_OF_RESOURCES  Can't allocate memory resources.
   @retval EFI_ALREADY_STARTED   This driver has been started.

 **/
 EFI_STATUS
 EFIAPI
 BlockIoDriverBindingStart (
   IN EFI_DRIVER_BINDING_PROTOCOL  *This,
   IN EFI_HANDLE                   Controller,
   IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
   )
 {
   EFI_STATUS                    Status;

   Status = BlockIoInit (This, Controller);
   if (EFI_ERROR (Status)) {
     DEBUG ((EFI_D_ERROR, "BlockIoDriverBindingStart: BlockIoInit (%r)\n", Status));
     return Status;
   }

   DEBUG ((EFI_D_INIT, "BlockIoDriverBindingStart: Successfully started\n"));
   return Status;
 }


 /**
   Stop controlling the device.

   @param  This                   The USB mass storage driver binding
   @param  Controller             The device controller controlled by the driver.
   @param  NumberOfChildren       The number of children of this device
   @param  ChildHandleBuffer      The buffer of children handle.

   @retval EFI_SUCCESS            The driver stopped from controlling the device.
   @retval EFI_DEVICE_ERROR       The device could not be stopped due to a device error.
   @retval EFI_UNSUPPORTED        Block I/O Protocol is not installed on Controller.
   @retval Others                 Failed to stop the driver

 **/
 EFI_STATUS
 EFIAPI
 BlockIoDriverBindingStop (
   IN  EFI_DRIVER_BINDING_PROTOCOL *This,
   IN  EFI_HANDLE                  Controller,
   IN  UINTN                       NumberOfChildren,
   IN  EFI_HANDLE                  *ChildHandleBuffer
   )
 {
   EFI_STATUS                    Status;
   BLOCK_MMIO_TO_BLOCK_IO_DEVICE *Private;

   Private = PRIVATE_FROM_BLOCK_IO (This);

   //
   // Uninstall Block I/O protocol from the device handle,
   // then call the transport protocol to stop itself.
   //
   Status = gBS->UninstallProtocolInterface (
                   Controller,
                   &gEfiBlockIoProtocolGuid,
                   &Private->BlockIo
                   );
   if (EFI_ERROR (Status)) {
     return Status;
   }

   gBS->CloseProtocol (
         Controller,
         &gBlockMmioProtocolGuid,
         This->DriverBindingHandle,
         Controller
         );

   FreePool (Private);

   DEBUG ((EFI_D_INFO, "Successfully stopped BlockIo on BlockMmio\n"));
   return EFI_SUCCESS;
 }

 /**
   Entrypoint of Block MMIO to Block IO Driver.

   This function is the entrypoint of USB Mass Storage Driver. It installs Driver Binding
   Protocol together with Component Name Protocols.

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

   @retval EFI_SUCCESS       The entry point is executed successfully.

 **/
 EFI_STATUS
 EFIAPI
 BlockMmioToBlockIoEntryPoint (
   IN EFI_HANDLE               ImageHandle,
   IN EFI_SYSTEM_TABLE         *SystemTable
   )
 {
   EFI_STATUS  Status;

   //
   // Install driver binding protocol
   //
   Status = EfiLibInstallDriverBindingComponentName2 (
              ImageHandle,
              SystemTable,
              &gBlockIoDriverBinding,
              ImageHandle,
              &gBlockMmioToBlockIoComponentName,
              &gBlockMmioToBlockIoComponentName2
              );
   ASSERT_EFI_ERROR (Status);

   return EFI_SUCCESS;
 }
	/** @file
	The driver wrappers BlockMmio protocol instances to produce
	Block I/O Protocol instances.

	Copyright (c) 2007 - 2012, Intel Corporation. All rights reserved.<BR>
	This program and the accompanying materials
	are licensed and made available under the terms and conditions of the BSD License
	which accompanies this distribution. The full text of the license may be found at
	http://opensource.org/licenses/bsd-license.php

	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

	**/

	#include "BlockIo.h"

	EFI_DRIVER_BINDING_PROTOCOL gBlockIoDriverBinding = {
	BlockIoDriverBindingSupported,
	BlockIoDriverBindingStart,
	BlockIoDriverBindingStop,
	0x11,
	NULL,
	NULL
	};

	/**
	Reset the block device.

	This function implements EFI_BLOCK_IO_PROTOCOL.Reset().
	It resets the block device hardware.
	ExtendedVerification is ignored in this implementation.

	@param This Indicates a pointer to the calling context.
	@param ExtendedVerification Indicates that the driver may perform a more exhaustive
	verification operation of the device during reset.

	@retval EFI_SUCCESS The block device was reset.
	@retval EFI_DEVICE_ERROR The block device is not functioning correctly and could not be reset.

	**/
	EFI_STATUS
	EFIAPI
	BlockIoReset (
	IN EFI_BLOCK_IO_PROTOCOL *This,
	IN BOOLEAN ExtendedVerification
	)
	{
	return EFI_SUCCESS;
	}

	/**
	Reads the requested number of blocks from the device.

	This function implements EFI_BLOCK_IO_PROTOCOL.ReadBlocks().
	It reads the requested number of blocks from the device.
	All the blocks are read, or an error is returned.

	@param This Indicates a pointer to the calling context.
	@param ReadData If TRUE then read data. If FALSE then write data.
	@param MediaId The media ID that the read request is for.
	@param Lba The starting logical block address to read from on the device.
	@param BufferSize The size of the Buffer in bytes.
	This must be a multiple of the intrinsic block size of the device.
	@param Buffer A pointer to the destination buffer for the data. The caller is
	responsible for either having implicit or explicit ownership of the buffer.

	@retval EFI_SUCCESS The data was read correctly from the device.
	@retval EFI_DEVICE_ERROR The device reported an error while attempting to perform the read operation.
	@retval EFI_NO_MEDIA There is no media in the device.
	@retval EFI_MEDIA_CHANGED The MediaId is not for the current media.
	@retval EFI_BAD_BUFFER_SIZE The BufferSize parameter is not a multiple of the intrinsic block size of the device.
	@retval EFI_INVALID_PARAMETER The read request contains LBAs that are not valid,
	or the buffer is not on proper alignment.

	**/
	EFI_STATUS
	EFIAPI
	ReadOrWriteBlocks (
	IN EFI_BLOCK_IO_PROTOCOL *This,
	IN BOOLEAN ReadData,
	IN UINT32 MediaId,
	IN EFI_LBA Lba,
	IN UINTN BufferSize,
	OUT VOID *Buffer
	)
	{
	EFI_STATUS Status;
	BLOCK_MMIO_TO_BLOCK_IO_DEVICE *Private;
	UINTN TotalBlock;
	EFI_BLOCK_IO_MEDIA *Media;
	UINT64 Address;
	UINTN Count;
	EFI_CPU_IO_PROTOCOL_IO_MEM CpuAccessFunction;

	//
	// First, validate the parameters
	//
	if ((Buffer == NULL) \|\| (BufferSize == 0)) {
	return EFI_INVALID_PARAMETER;
	}

	//
	// Get private data structure
	//
	Private = PRIVATE_FROM_BLOCK_IO (This);
	Media = Private->BlockMmio->Media;

	//
	// BufferSize must be a multiple of the intrinsic block size of the device.
	//
	if (ModU64x32 (BufferSize, Media->BlockSize) != 0) {
	return EFI_BAD_BUFFER_SIZE;
	}

	TotalBlock = (UINTN) DivU64x32 (BufferSize, Media->BlockSize);

	//
	// Make sure the range to read is valid.
	//
	if (Lba + TotalBlock - 1 > Media->LastBlock) {
	return EFI_INVALID_PARAMETER;
	}

	if (!(Media->MediaPresent)) {
	return EFI_NO_MEDIA;
	}

	if (MediaId != Media->MediaId) {
	return EFI_MEDIA_CHANGED;
	}

	Address = Private->BlockMmio->BaseAddress;
	Address += MultU64x32 (Lba, Media->BlockSize);

	Count = BufferSize >> 3;

	if (ReadData) {
	CpuAccessFunction = Private->CpuIo->Mem.Read;
	} else {
	CpuAccessFunction = Private->CpuIo->Mem.Write;
	}

	Status = (CpuAccessFunction) (
	Private->CpuIo,
	EfiCpuIoWidthUint64,
	Address,
	Count,
	Buffer
	);

	return Status;
	}


	/**
	Reads the requested number of blocks from the device.

	This function implements EFI_BLOCK_IO_PROTOCOL.ReadBlocks().
	It reads the requested number of blocks from the device.
	All the blocks are read, or an error is returned.

	@param This Indicates a pointer to the calling context.
	@param MediaId The media ID that the read request is for.
	@param Lba The starting logical block address to read from on the device.
	@param BufferSize The size of the Buffer in bytes.
	This must be a multiple of the intrinsic block size of the device.
	@param Buffer A pointer to the destination buffer for the data. The caller is
	responsible for either having implicit or explicit ownership of the buffer.

	@retval EFI_SUCCESS The data was read correctly from the device.
	@retval EFI_DEVICE_ERROR The device reported an error while attempting to perform the read operation.
	@retval EFI_NO_MEDIA There is no media in the device.
	@retval EFI_MEDIA_CHANGED The MediaId is not for the current media.
	@retval EFI_BAD_BUFFER_SIZE The BufferSize parameter is not a multiple of the intrinsic block size of the device.
	@retval EFI_INVALID_PARAMETER The read request contains LBAs that are not valid,
	or the buffer is not on proper alignment.

	**/
	EFI_STATUS
	EFIAPI
	BlockIoReadBlocks (
	IN EFI_BLOCK_IO_PROTOCOL *This,
	IN UINT32 MediaId,
	IN EFI_LBA Lba,
	IN UINTN BufferSize,
	OUT VOID *Buffer
	)
	{
	DEBUG ((EFI_D_INFO, "BlockIo (MMIO) ReadBlocks: lba=0x%Lx, size=0x%Lx\n",
	Lba, (UINT64)BufferSize));
	return ReadOrWriteBlocks (
	This,
	TRUE,
	MediaId,
	Lba,
	BufferSize,
	Buffer
	);
	}


	/**
	Writes a specified number of blocks to the device.

	This function implements EFI_BLOCK_IO_PROTOCOL.WriteBlocks().
	It writes a specified number of blocks to the device.
	All blocks are written, or an error is returned.

	@param This Indicates a pointer to the calling context.
	@param MediaId The media ID that the write request is for.
	@param Lba The starting logical block address to be written.
	@param BufferSize The size of the Buffer in bytes.
	This must be a multiple of the intrinsic block size of the device.
	@param Buffer Pointer to the source buffer for the data.

	@retval EFI_SUCCESS The data were written correctly to the device.
	@retval EFI_WRITE_PROTECTED The device cannot be written to.
	@retval EFI_NO_MEDIA There is no media in the device.
	@retval EFI_MEDIA_CHANGED The MediaId is not for the current media.
	@retval EFI_DEVICE_ERROR The device reported an error while attempting to perform the write operation.
	@retval EFI_BAD_BUFFER_SIZE The BufferSize parameter is not a multiple of the intrinsic
	block size of the device.
	@retval EFI_INVALID_PARAMETER The write request contains LBAs that are not valid,
	or the buffer is not on proper alignment.

	**/
	EFI_STATUS
	EFIAPI
	BlockIoWriteBlocks (
	IN EFI_BLOCK_IO_PROTOCOL *This,
	IN UINT32 MediaId,
	IN EFI_LBA Lba,
	IN UINTN BufferSize,
	IN VOID *Buffer
	)
	{
	DEBUG ((EFI_D_INFO, "BlockIo (MMIO) WriteBlocks: lba=0x%Lx, size=0x%Lx\n",
	Lba, (UINT64)BufferSize));
	return ReadOrWriteBlocks (
	This,
	FALSE,
	MediaId,
	Lba,
	BufferSize,
	Buffer
	);
	}

	/**
	Flushes all modified data to a physical block device.

	@param This Indicates a pointer to the calling context.

	@retval EFI_SUCCESS All outstanding data were written correctly to the device.
	@retval EFI_DEVICE_ERROR The device reported an error while attempting to write data.
	@retval EFI_NO_MEDIA There is no media in the device.

	**/
	EFI_STATUS
	EFIAPI
	BlockIoFlushBlocks (
	IN EFI_BLOCK_IO_PROTOCOL *This
	)
	{
	return EFI_SUCCESS;
	}


	/**
	Initialize data for device that does not support multiple LUNSs.

	@param This The Driver Binding Protocol instance.
	@param Controller The device to initialize.
	@param BlockMmio Pointer to USB_MASS_TRANSPORT.
	@param Context Parameter for USB_MASS_DEVICE.Context.

	@retval EFI_SUCCESS Initialization succeeds.
	@retval Other Initialization fails.

	**/
	EFI_STATUS
	BlockIoInit (
	IN EFI_DRIVER_BINDING_PROTOCOL *This,
	IN EFI_HANDLE Controller
	)
	{
	EFI_STATUS Status;
	BLOCK_MMIO_TO_BLOCK_IO_DEVICE *Private;
	BLOCK_MMIO_PROTOCOL *BlockMmio;

	Private = (BLOCK_MMIO_TO_BLOCK_IO_DEVICE) AllocateZeroPool (sizeof (Private));
	ASSERT (Private != NULL);

	Status = gBS->LocateProtocol (
	&gEfiCpuIo2ProtocolGuid,
	NULL,
	(VOID **) &(Private->CpuIo)
	);
	ASSERT_EFI_ERROR (Status);

	Status = gBS->OpenProtocol (
	Controller,
	&gBlockMmioProtocolGuid,
	(VOID **) &BlockMmio,
	This->DriverBindingHandle,
	Controller,
	EFI_OPEN_PROTOCOL_BY_DRIVER
	);
	if (EFI_ERROR (Status)) {
	DEBUG ((EFI_D_ERROR, "BlockIoInit: OpenBlockMmioProtocol By Driver (%r)\n", Status));
	goto ON_ERROR;
	}
	DEBUG ((EFI_D_INFO, "BlockMmio: %p\n", BlockMmio));
	DEBUG ((EFI_D_INFO, "BlockMmio->Media->LastBlock: 0x%lx\n", BlockMmio->Media->LastBlock));

	Private->Signature = BLOCK_MMIO_TO_BLOCK_IO_SIGNATURE;
	Private->Controller = Controller;
	Private->BlockMmio = BlockMmio;
	Private->BlockIo.Media = BlockMmio->Media;
	Private->BlockIo.Reset = BlockIoReset;
	Private->BlockIo.ReadBlocks = BlockIoReadBlocks;
	Private->BlockIo.WriteBlocks = BlockIoWriteBlocks;
	Private->BlockIo.FlushBlocks = BlockIoFlushBlocks;

	DEBUG ((EFI_D_INFO, "Private->BlockIo.Media->LastBlock: 0x%lx\n", Private->BlockIo.Media->LastBlock));

	Status = gBS->InstallProtocolInterface (
	&Controller,
	&gEfiBlockIoProtocolGuid,
	EFI_NATIVE_INTERFACE,
	&Private->BlockIo
	);
	if (EFI_ERROR (Status)) {
	goto ON_ERROR;
	}

	return EFI_SUCCESS;

	ON_ERROR:
	if (Private != NULL) {
	FreePool (Private);
	}
	if (BlockMmio != NULL) {
	gBS->CloseProtocol (
	Controller,
	&gBlockMmioProtocolGuid,
	This->DriverBindingHandle,
	Controller
	);
	}
	return Status;
	}


	/**
	Check whether the controller is a supported USB mass storage.

	@param This The USB mass storage driver binding protocol.
	@param Controller The controller handle to check.
	@param RemainingDevicePath The remaining device path.

	@retval EFI_SUCCESS The driver supports this controller.
	@retval other This device isn't supported.

	**/
	EFI_STATUS
	EFIAPI
	BlockIoDriverBindingSupported (
	IN EFI_DRIVER_BINDING_PROTOCOL *This,
	IN EFI_HANDLE Controller,
	IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
	)
	{
	EFI_STATUS Status;
	BLOCK_MMIO_PROTOCOL *BlockMmio;

	Status = gBS->OpenProtocol (
	Controller,
	&gBlockMmioProtocolGuid,
	(VOID **) &BlockMmio,
	This->DriverBindingHandle,
	Controller,
	EFI_OPEN_PROTOCOL_BY_DRIVER
	);
	if (EFI_ERROR (Status)) {
	return Status;
	}

	gBS->CloseProtocol (
	Controller,
	&gBlockMmioProtocolGuid,
	This->DriverBindingHandle,
	Controller
	);

	return Status;
	}

	/**
	Starts the USB mass storage device with this driver.

	This function consumes USB I/O Portocol, intializes USB mass storage device,
	installs Block I/O Protocol, and submits Asynchronous Interrupt
	Transfer to manage the USB mass storage device.

	@param This The USB mass storage driver binding protocol.
	@param Controller The USB mass storage device to start on
	@param RemainingDevicePath The remaining device path.

	@retval EFI_SUCCESS This driver supports this device.
	@retval EFI_UNSUPPORTED This driver does not support this device.
	@retval EFI_DEVICE_ERROR This driver cannot be started due to device Error.
	@retval EFI_OUT_OF_RESOURCES Can't allocate memory resources.
	@retval EFI_ALREADY_STARTED This driver has been started.

	**/
	EFI_STATUS
	EFIAPI
	BlockIoDriverBindingStart (
	IN EFI_DRIVER_BINDING_PROTOCOL *This,
	IN EFI_HANDLE Controller,
	IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
	)
	{
	EFI_STATUS Status;

	Status = BlockIoInit (This, Controller);
	if (EFI_ERROR (Status)) {
	DEBUG ((EFI_D_ERROR, "BlockIoDriverBindingStart: BlockIoInit (%r)\n", Status));
	return Status;
	}

	DEBUG ((EFI_D_INIT, "BlockIoDriverBindingStart: Successfully started\n"));
	return Status;
	}


	/**
	Stop controlling the device.

	@param This The USB mass storage driver binding
	@param Controller The device controller controlled by the driver.
	@param NumberOfChildren The number of children of this device
	@param ChildHandleBuffer The buffer of children handle.

	@retval EFI_SUCCESS The driver stopped from controlling the device.
	@retval EFI_DEVICE_ERROR The device could not be stopped due to a device error.
	@retval EFI_UNSUPPORTED Block I/O Protocol is not installed on Controller.
	@retval Others Failed to stop the driver

	**/
	EFI_STATUS
	EFIAPI
	BlockIoDriverBindingStop (
	IN EFI_DRIVER_BINDING_PROTOCOL *This,
	IN EFI_HANDLE Controller,
	IN UINTN NumberOfChildren,
	IN EFI_HANDLE *ChildHandleBuffer
	)
	{
	EFI_STATUS Status;
	BLOCK_MMIO_TO_BLOCK_IO_DEVICE *Private;

	Private = PRIVATE_FROM_BLOCK_IO (This);

	//
	// Uninstall Block I/O protocol from the device handle,
	// then call the transport protocol to stop itself.
	//
	Status = gBS->UninstallProtocolInterface (
	Controller,
	&gEfiBlockIoProtocolGuid,
	&Private->BlockIo
	);
	if (EFI_ERROR (Status)) {
	return Status;
	}

	gBS->CloseProtocol (
	Controller,
	&gBlockMmioProtocolGuid,
	This->DriverBindingHandle,
	Controller
	);

	FreePool (Private);

	DEBUG ((EFI_D_INFO, "Successfully stopped BlockIo on BlockMmio\n"));
	return EFI_SUCCESS;
	}

	/**
	Entrypoint of Block MMIO to Block IO Driver.

	This function is the entrypoint of USB Mass Storage Driver. It installs Driver Binding
	Protocol together with Component Name Protocols.

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

	@retval EFI_SUCCESS The entry point is executed successfully.

	**/
	EFI_STATUS
	EFIAPI
	BlockMmioToBlockIoEntryPoint (
	IN EFI_HANDLE ImageHandle,
	IN EFI_SYSTEM_TABLE *SystemTable
	)
	{
	EFI_STATUS Status;

	//
	// Install driver binding protocol
	//
	Status = EfiLibInstallDriverBindingComponentName2 (
	ImageHandle,
	SystemTable,
	&gBlockIoDriverBinding,
	ImageHandle,
	&gBlockMmioToBlockIoComponentName,
	&gBlockMmioToBlockIoComponentName2
	);
	ASSERT_EFI_ERROR (Status);

	return EFI_SUCCESS;
	}