+/** @file\r
+ DiskIo driver that layers it's self on every Block IO protocol in the system.\r
+ DiskIo converts a block oriented device to a byte oriented device.\r
+\r
+ ReadDisk may have to do reads that are not aligned on sector boundaries.\r
+ There are three cases:\r
+ UnderRun - The first byte is not on a sector boundary or the read request is\r
+ less than a sector in length.\r
+ Aligned - A read of N contiguous sectors.\r
+ OverRun - The last byte is not on a sector boundary.\r
+\r
+ Copyright (c) 2006 - 2007, Intel Corporation \r
+ All rights reserved. This program and the accompanying materials \r
+ are licensed and made available under the terms and conditions of the BSD License \r
+ which accompanies this distribution. The full text of the license may be found at \r
+ http://opensource.org/licenses/bsd-license.php \r
+\r
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r
+ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r
+\r
+**/\r
+\r
+#include "DiskIo.h"\r
+\r
+EFI_DRIVER_BINDING_PROTOCOL gDiskIoDriverBinding = {\r
+ DiskIoDriverBindingSupported,\r
+ DiskIoDriverBindingStart,\r
+ DiskIoDriverBindingStop,\r
+ 0xa,\r
+ NULL,\r
+ NULL\r
+};\r
+\r
+DISK_IO_PRIVATE_DATA gDiskIoPrivateDataTemplate = {\r
+ DISK_IO_PRIVATE_DATA_SIGNATURE,\r
+ {\r
+ EFI_DISK_IO_PROTOCOL_REVISION,\r
+ DiskIoReadDisk,\r
+ DiskIoWriteDisk\r
+ },\r
+ NULL\r
+};\r
+\r
+\r
+/**\r
+ Test to see if this driver supports ControllerHandle. \r
+\r
+ @param This Protocol instance pointer.\r
+ @param ControllerHandle Handle of device to test\r
+ @param RemainingDevicePath Optional parameter use to pick a specific child\r
+ device to start.\r
+\r
+ @retval EFI_SUCCESS This driver supports this device\r
+ @retval EFI_ALREADY_STARTED This driver is already running on this device\r
+ @retval other This driver does not support this device\r
+\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+DiskIoDriverBindingSupported (\r
+ IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
+ IN EFI_HANDLE ControllerHandle,\r
+ IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+ EFI_BLOCK_IO_PROTOCOL *BlockIo;\r
+\r
+ //\r
+ // Open the IO Abstraction(s) needed to perform the supported test.\r
+ //\r
+ Status = gBS->OpenProtocol (\r
+ ControllerHandle,\r
+ &gEfiBlockIoProtocolGuid,\r
+ (VOID **) &BlockIo,\r
+ This->DriverBindingHandle,\r
+ ControllerHandle,\r
+ EFI_OPEN_PROTOCOL_BY_DRIVER\r
+ );\r
+ if (EFI_ERROR (Status)) {\r
+ return Status;\r
+ }\r
+\r
+ //\r
+ // Close the I/O Abstraction(s) used to perform the supported test.\r
+ //\r
+ gBS->CloseProtocol (\r
+ ControllerHandle,\r
+ &gEfiBlockIoProtocolGuid,\r
+ This->DriverBindingHandle,\r
+ ControllerHandle\r
+ );\r
+ return EFI_SUCCESS;\r
+}\r
+\r
+\r
+/**\r
+ Start this driver on ControllerHandle by opening a Block IO protocol and\r
+ installing a Disk IO protocol on ControllerHandle.\r
+\r
+ @param This Protocol instance pointer.\r
+ @param ControllerHandle Handle of device to bind driver to\r
+ @param RemainingDevicePath Optional parameter use to pick a specific child\r
+ device to start.\r
+\r
+ @retval EFI_SUCCESS This driver is added to ControllerHandle\r
+ @retval EFI_ALREADY_STARTED This driver is already running on ControllerHandle\r
+ @retval other This driver does not support this device\r
+\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+DiskIoDriverBindingStart (\r
+ IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
+ IN EFI_HANDLE ControllerHandle,\r
+ IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+ DISK_IO_PRIVATE_DATA *Private;\r
+\r
+ Private = NULL;\r
+\r
+ //\r
+ // Connect to the Block IO interface on ControllerHandle.\r
+ //\r
+ Status = gBS->OpenProtocol (\r
+ ControllerHandle,\r
+ &gEfiBlockIoProtocolGuid,\r
+ (VOID **) &gDiskIoPrivateDataTemplate.BlockIo,\r
+ This->DriverBindingHandle,\r
+ ControllerHandle,\r
+ EFI_OPEN_PROTOCOL_BY_DRIVER\r
+ );\r
+ if (EFI_ERROR (Status)) {\r
+ return Status;\r
+ }\r
+ \r
+ //\r
+ // Initialize the Disk IO device instance.\r
+ //\r
+ Private = AllocateCopyPool (sizeof (DISK_IO_PRIVATE_DATA), &gDiskIoPrivateDataTemplate);\r
+ if (Private == NULL) {\r
+ Status = EFI_OUT_OF_RESOURCES;\r
+ goto ErrorExit;\r
+ }\r
+ \r
+ //\r
+ // Install protocol interfaces for the Disk IO device.\r
+ //\r
+ Status = gBS->InstallProtocolInterface (\r
+ &ControllerHandle,\r
+ &gEfiDiskIoProtocolGuid,\r
+ EFI_NATIVE_INTERFACE,\r
+ &Private->DiskIo\r
+ );\r
+\r
+ErrorExit:\r
+ if (EFI_ERROR (Status)) {\r
+\r
+ if (Private != NULL) {\r
+ FreePool (Private);\r
+ }\r
+\r
+ gBS->CloseProtocol (\r
+ ControllerHandle,\r
+ &gEfiBlockIoProtocolGuid,\r
+ This->DriverBindingHandle,\r
+ ControllerHandle\r
+ );\r
+ }\r
+\r
+ return Status;\r
+}\r
+\r
+\r
+/**\r
+ Stop this driver on ControllerHandle by removing Disk IO protocol and closing\r
+ the Block IO protocol on ControllerHandle.\r
+\r
+ @param This Protocol instance pointer.\r
+ @param ControllerHandle Handle of device to stop driver on\r
+ @param NumberOfChildren Number of Handles in ChildHandleBuffer. If number of\r
+ children is zero stop the entire bus driver.\r
+ @param ChildHandleBuffer List of Child Handles to Stop.\r
+\r
+ @retval EFI_SUCCESS This driver is removed ControllerHandle\r
+ @retval other This driver was not removed from this device\r
+\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+DiskIoDriverBindingStop (\r
+ IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
+ IN EFI_HANDLE ControllerHandle,\r
+ IN UINTN NumberOfChildren,\r
+ IN EFI_HANDLE *ChildHandleBuffer\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+ EFI_DISK_IO_PROTOCOL *DiskIo;\r
+ DISK_IO_PRIVATE_DATA *Private;\r
+\r
+ //\r
+ // Get our context back.\r
+ //\r
+ Status = gBS->OpenProtocol (\r
+ ControllerHandle,\r
+ &gEfiDiskIoProtocolGuid,\r
+ (VOID **) &DiskIo,\r
+ This->DriverBindingHandle,\r
+ ControllerHandle,\r
+ EFI_OPEN_PROTOCOL_GET_PROTOCOL\r
+ );\r
+ if (EFI_ERROR (Status)) {\r
+ return EFI_UNSUPPORTED;\r
+ }\r
+\r
+ Private = DISK_IO_PRIVATE_DATA_FROM_THIS (DiskIo);\r
+\r
+ Status = gBS->UninstallProtocolInterface (\r
+ ControllerHandle,\r
+ &gEfiDiskIoProtocolGuid,\r
+ &Private->DiskIo\r
+ );\r
+ if (!EFI_ERROR (Status)) {\r
+\r
+ Status = gBS->CloseProtocol (\r
+ ControllerHandle,\r
+ &gEfiBlockIoProtocolGuid,\r
+ This->DriverBindingHandle,\r
+ ControllerHandle\r
+ );\r
+ }\r
+\r
+ if (!EFI_ERROR (Status)) {\r
+ FreePool (Private);\r
+ }\r
+\r
+ return Status;\r
+}\r
+\r
+\r
+\r
+/**\r
+ Read BufferSize bytes from Offset into Buffer.\r
+ Reads may support reads that are not aligned on\r
+ sector boundaries. There are three cases:\r
+ UnderRun - The first byte is not on a sector boundary or the read request is\r
+ less than a sector in length.\r
+ Aligned - A read of N contiguous sectors.\r
+ OverRun - The last byte is not on a sector boundary.\r
+\r
+ @param This Protocol instance pointer.\r
+ @param MediaId Id of the media, changes every time the media is replaced.\r
+ @param Offset The starting byte offset to read from\r
+ @param BufferSize Size of Buffer\r
+ @param Buffer Buffer containing read data\r
+\r
+ @retval EFI_SUCCESS The data was read correctly from the device.\r
+ @retval EFI_DEVICE_ERROR The device reported an error while performing the read.\r
+ @retval EFI_NO_MEDIA There is no media in the device.\r
+ @retval EFI_MEDIA_CHNAGED The MediaId does not matched the current device.\r
+ @retval EFI_INVALID_PARAMETER The read request contains device addresses that are not\r
+ valid for the device.\r
+\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+DiskIoReadDisk (\r
+ IN EFI_DISK_IO_PROTOCOL *This,\r
+ IN UINT32 MediaId,\r
+ IN UINT64 Offset,\r
+ IN UINTN BufferSize,\r
+ OUT VOID *Buffer\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+ DISK_IO_PRIVATE_DATA *Private;\r
+ EFI_BLOCK_IO_PROTOCOL *BlockIo;\r
+ EFI_BLOCK_IO_MEDIA *Media;\r
+ UINT32 BlockSize;\r
+ UINT64 Lba;\r
+ UINT64 OverRunLba;\r
+ UINT32 UnderRun;\r
+ UINT32 OverRun;\r
+ BOOLEAN TransactionComplete;\r
+ UINTN WorkingBufferSize;\r
+ UINT8 *WorkingBuffer;\r
+ UINTN Length;\r
+ UINT8 *Data;\r
+ UINT8 *PreData;\r
+ UINTN IsBufferAligned;\r
+ UINTN DataBufferSize;\r
+ BOOLEAN LastRead;\r
+\r
+ Private = DISK_IO_PRIVATE_DATA_FROM_THIS (This);\r
+\r
+ BlockIo = Private->BlockIo;\r
+ Media = BlockIo->Media;\r
+ BlockSize = Media->BlockSize;\r
+\r
+ if (Media->MediaId != MediaId) {\r
+ return EFI_MEDIA_CHANGED;\r
+ }\r
+\r
+ WorkingBuffer = Buffer;\r
+ WorkingBufferSize = BufferSize;\r
+\r
+ //\r
+ // Allocate a temporary buffer for operation\r
+ //\r
+ DataBufferSize = BlockSize * DATA_BUFFER_BLOCK_NUM;\r
+\r
+ if (Media->IoAlign > 1) {\r
+ PreData = AllocatePool (DataBufferSize + Media->IoAlign);\r
+ Data = PreData - ((UINTN) PreData & (Media->IoAlign - 1)) + Media->IoAlign;\r
+ } else {\r
+ PreData = AllocatePool (DataBufferSize);\r
+ Data = PreData;\r
+ }\r
+\r
+ if (PreData == NULL) {\r
+ return EFI_OUT_OF_RESOURCES;\r
+ }\r
+\r
+ Lba = DivU64x32Remainder (Offset, BlockSize, &UnderRun);\r
+\r
+ Length = BlockSize - UnderRun;\r
+ TransactionComplete = FALSE;\r
+\r
+ Status = EFI_SUCCESS;\r
+ if (UnderRun != 0) {\r
+ //\r
+ // Offset starts in the middle of an Lba, so read the entire block.\r
+ //\r
+ Status = BlockIo->ReadBlocks (\r
+ BlockIo,\r
+ MediaId,\r
+ Lba,\r
+ BlockSize,\r
+ Data\r
+ );\r
+\r
+ if (EFI_ERROR (Status)) {\r
+ goto Done;\r
+ }\r
+\r
+ if (Length > BufferSize) {\r
+ Length = BufferSize;\r
+ TransactionComplete = TRUE;\r
+ }\r
+\r
+ CopyMem (WorkingBuffer, Data + UnderRun, Length);\r
+\r
+ WorkingBuffer += Length;\r
+\r
+ WorkingBufferSize -= Length;\r
+ if (WorkingBufferSize == 0) {\r
+ goto Done;\r
+ }\r
+\r
+ Lba += 1;\r
+ }\r
+\r
+ OverRunLba = Lba + DivU64x32Remainder (WorkingBufferSize, BlockSize, &OverRun);\r
+\r
+ if (!TransactionComplete && WorkingBufferSize >= BlockSize) {\r
+ //\r
+ // If the DiskIo maps directly to a BlockIo device do the read.\r
+ //\r
+ if (OverRun != 0) {\r
+ WorkingBufferSize -= OverRun;\r
+ }\r
+ //\r
+ // Check buffer alignment\r
+ //\r
+ IsBufferAligned = (UINTN) WorkingBuffer & (UINTN) (Media->IoAlign - 1);\r
+\r
+ if (Media->IoAlign <= 1 || IsBufferAligned == 0) {\r
+ //\r
+ // Alignment is satisfied, so read them together\r
+ //\r
+ Status = BlockIo->ReadBlocks (\r
+ BlockIo,\r
+ MediaId,\r
+ Lba,\r
+ WorkingBufferSize,\r
+ WorkingBuffer\r
+ );\r
+\r
+ if (EFI_ERROR (Status)) {\r
+ goto Done;\r
+ }\r
+\r
+ WorkingBuffer += WorkingBufferSize;\r
+\r
+ } else {\r
+ //\r
+ // Use the allocated buffer instead of the original buffer\r
+ // to avoid alignment issue.\r
+ // Here, the allocated buffer (8-byte align) can satisfy the alignment\r
+ //\r
+ LastRead = FALSE;\r
+ do {\r
+ if (WorkingBufferSize <= DataBufferSize) {\r
+ //\r
+ // It is the last calling to readblocks in this loop\r
+ //\r
+ DataBufferSize = WorkingBufferSize;\r
+ LastRead = TRUE;\r
+ }\r
+\r
+ Status = BlockIo->ReadBlocks (\r
+ BlockIo,\r
+ MediaId,\r
+ Lba,\r
+ DataBufferSize,\r
+ Data\r
+ );\r
+ if (EFI_ERROR (Status)) {\r
+ goto Done;\r
+ }\r
+\r
+ CopyMem (WorkingBuffer, Data, DataBufferSize);\r
+ WorkingBufferSize -= DataBufferSize;\r
+ WorkingBuffer += DataBufferSize;\r
+ Lba += DATA_BUFFER_BLOCK_NUM;\r
+ } while (!LastRead);\r
+ }\r
+ }\r
+\r
+ if (!TransactionComplete && OverRun != 0) {\r
+ //\r
+ // Last read is not a complete block.\r
+ //\r
+ Status = BlockIo->ReadBlocks (\r
+ BlockIo,\r
+ MediaId,\r
+ OverRunLba,\r
+ BlockSize,\r
+ Data\r
+ );\r
+\r
+ if (EFI_ERROR (Status)) {\r
+ goto Done;\r
+ }\r
+\r
+ CopyMem (WorkingBuffer, Data, OverRun);\r
+ }\r
+\r
+Done:\r
+ if (PreData != NULL) {\r
+ FreePool (PreData);\r
+ }\r
+\r
+ return Status;\r
+}\r
+\r
+\r
+/**\r
+ Read BufferSize bytes from Offset into Buffer.\r
+ Writes may require a read modify write to support writes that are not\r
+ aligned on sector boundaries. There are three cases:\r
+ UnderRun - The first byte is not on a sector boundary or the write request\r
+ is less than a sector in length. Read modify write is required.\r
+ Aligned - A write of N contiguous sectors.\r
+ OverRun - The last byte is not on a sector boundary. Read modified write\r
+ required.\r
+\r
+ @param This Protocol instance pointer.\r
+ @param MediaId Id of the media, changes every time the media is replaced.\r
+ @param Offset The starting byte offset to read from\r
+ @param BufferSize Size of Buffer\r
+ @param Buffer Buffer containing read data\r
+\r
+ @retval EFI_SUCCESS The data was written correctly to the device.\r
+ @retval EFI_WRITE_PROTECTED The device can not be written to.\r
+ @retval EFI_DEVICE_ERROR The device reported an error while performing the write.\r
+ @retval EFI_NO_MEDIA There is no media in the device.\r
+ @retval EFI_MEDIA_CHNAGED The MediaId does not matched the current device.\r
+ @retval EFI_INVALID_PARAMETER The write request contains device addresses that are not\r
+ valid for the device.\r
+\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+DiskIoWriteDisk (\r
+ IN EFI_DISK_IO_PROTOCOL *This,\r
+ IN UINT32 MediaId,\r
+ IN UINT64 Offset,\r
+ IN UINTN BufferSize,\r
+ IN VOID *Buffer\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+ DISK_IO_PRIVATE_DATA *Private;\r
+ EFI_BLOCK_IO_PROTOCOL *BlockIo;\r
+ EFI_BLOCK_IO_MEDIA *Media;\r
+ UINT32 BlockSize;\r
+ UINT64 Lba;\r
+ UINT64 OverRunLba;\r
+ UINT32 UnderRun;\r
+ UINT32 OverRun;\r
+ BOOLEAN TransactionComplete;\r
+ UINTN WorkingBufferSize;\r
+ UINT8 *WorkingBuffer;\r
+ UINTN Length;\r
+ UINT8 *Data;\r
+ UINT8 *PreData;\r
+ UINTN IsBufferAligned;\r
+ UINTN DataBufferSize;\r
+ BOOLEAN LastWrite;\r
+\r
+ Private = DISK_IO_PRIVATE_DATA_FROM_THIS (This);\r
+\r
+ BlockIo = Private->BlockIo;\r
+ Media = BlockIo->Media;\r
+ BlockSize = Media->BlockSize;\r
+\r
+ if (Media->ReadOnly) {\r
+ return EFI_WRITE_PROTECTED;\r
+ }\r
+\r
+ if (Media->MediaId != MediaId) {\r
+ return EFI_MEDIA_CHANGED;\r
+ }\r
+\r
+ DataBufferSize = BlockSize * DATA_BUFFER_BLOCK_NUM;\r
+\r
+ if (Media->IoAlign > 1) {\r
+ PreData = AllocatePool (DataBufferSize + Media->IoAlign);\r
+ Data = PreData - ((UINTN) PreData & (Media->IoAlign - 1)) + Media->IoAlign;\r
+ } else {\r
+ PreData = AllocatePool (DataBufferSize);\r
+ Data = PreData;\r
+ }\r
+\r
+ if (PreData == NULL) {\r
+ return EFI_OUT_OF_RESOURCES;\r
+ }\r
+\r
+ WorkingBuffer = Buffer;\r
+ WorkingBufferSize = BufferSize;\r
+\r
+ Lba = DivU64x32Remainder (Offset, BlockSize, &UnderRun);\r
+\r
+ Length = BlockSize - UnderRun;\r
+ TransactionComplete = FALSE;\r
+\r
+ Status = EFI_SUCCESS;\r
+ if (UnderRun != 0) {\r
+ //\r
+ // Offset starts in the middle of an Lba, so do read modify write.\r
+ //\r
+ Status = BlockIo->ReadBlocks (\r
+ BlockIo,\r
+ MediaId,\r
+ Lba,\r
+ BlockSize,\r
+ Data\r
+ );\r
+\r
+ if (EFI_ERROR (Status)) {\r
+ goto Done;\r
+ }\r
+\r
+ if (Length > BufferSize) {\r
+ Length = BufferSize;\r
+ TransactionComplete = TRUE;\r
+ }\r
+\r
+ CopyMem (Data + UnderRun, WorkingBuffer, Length);\r
+\r
+ Status = BlockIo->WriteBlocks (\r
+ BlockIo,\r
+ MediaId,\r
+ Lba,\r
+ BlockSize,\r
+ Data\r
+ );\r
+ if (EFI_ERROR (Status)) {\r
+ goto Done;\r
+ }\r
+\r
+ WorkingBuffer += Length;\r
+ WorkingBufferSize -= Length;\r
+ if (WorkingBufferSize == 0) {\r
+ goto Done;\r
+ }\r
+\r
+ Lba += 1;\r
+ }\r
+\r
+ OverRunLba = Lba + DivU64x32Remainder (WorkingBufferSize, BlockSize, &OverRun);\r
+\r
+ if (!TransactionComplete && WorkingBufferSize >= BlockSize) {\r
+ //\r
+ // If the DiskIo maps directly to a BlockIo device do the write.\r
+ //\r
+ if (OverRun != 0) {\r
+ WorkingBufferSize -= OverRun;\r
+ }\r
+ //\r
+ // Check buffer alignment\r
+ //\r
+ IsBufferAligned = (UINTN) WorkingBuffer & (UINTN) (Media->IoAlign - 1);\r
+\r
+ if (Media->IoAlign <= 1 || IsBufferAligned == 0) {\r
+ //\r
+ // Alignment is satisfied, so write them together\r
+ //\r
+ Status = BlockIo->WriteBlocks (\r
+ BlockIo,\r
+ MediaId,\r
+ Lba,\r
+ WorkingBufferSize,\r
+ WorkingBuffer\r
+ );\r
+\r
+ if (EFI_ERROR (Status)) {\r
+ goto Done;\r
+ }\r
+\r
+ WorkingBuffer += WorkingBufferSize;\r
+\r
+ } else {\r
+ //\r
+ // The buffer parameter is not aligned with the request\r
+ // So use the allocated instead.\r
+ // It can fit almost all the cases.\r
+ //\r
+ LastWrite = FALSE;\r
+ do {\r
+ if (WorkingBufferSize <= DataBufferSize) {\r
+ //\r
+ // It is the last calling to writeblocks in this loop\r
+ //\r
+ DataBufferSize = WorkingBufferSize;\r
+ LastWrite = TRUE;\r
+ }\r
+\r
+ CopyMem (Data, WorkingBuffer, DataBufferSize);\r
+ Status = BlockIo->WriteBlocks (\r
+ BlockIo,\r
+ MediaId,\r
+ Lba,\r
+ DataBufferSize,\r
+ Data\r
+ );\r
+ if (EFI_ERROR (Status)) {\r
+ goto Done;\r
+ }\r
+\r
+ WorkingBufferSize -= DataBufferSize;\r
+ WorkingBuffer += DataBufferSize;\r
+ Lba += DATA_BUFFER_BLOCK_NUM;\r
+ } while (!LastWrite);\r
+ }\r
+ }\r
+\r
+ if (!TransactionComplete && OverRun != 0) {\r
+ //\r
+ // Last bit is not a complete block, so do a read modify write.\r
+ //\r
+ Status = BlockIo->ReadBlocks (\r
+ BlockIo,\r
+ MediaId,\r
+ OverRunLba,\r
+ BlockSize,\r
+ Data\r
+ );\r
+\r
+ if (EFI_ERROR (Status)) {\r
+ goto Done;\r
+ }\r
+\r
+ CopyMem (Data, WorkingBuffer, OverRun);\r
+\r
+ Status = BlockIo->WriteBlocks (\r
+ BlockIo,\r
+ MediaId,\r
+ OverRunLba,\r
+ BlockSize,\r
+ Data\r
+ );\r
+ if (EFI_ERROR (Status)) {\r
+ goto Done;\r
+ }\r
+ }\r
+\r
+Done:\r
+ if (PreData != NULL) {\r
+ FreePool (PreData);\r
+ }\r
+\r
+ return Status;\r
+}\r
+\r
+\r
+/**\r
+ The user Entry Point for module DiskIo. The user code starts with this function.\r
+\r
+ @param[in] ImageHandle The firmware allocated handle for the EFI image. \r
+ @param[in] SystemTable A pointer to the EFI System Table.\r
+ \r
+ @retval EFI_SUCCESS The entry point is executed successfully.\r
+ @retval other Some error occurs when executing this entry point.\r
+\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+InitializeDiskIo (\r
+ IN EFI_HANDLE ImageHandle,\r
+ IN EFI_SYSTEM_TABLE *SystemTable\r
+ )\r
+{\r
+ EFI_STATUS Status;\r
+\r
+ //\r
+ // Install driver model protocol(s).\r
+ //\r
+ Status = EfiLibInstallAllDriverProtocols (\r
+ ImageHandle,\r
+ SystemTable,\r
+ &gDiskIoDriverBinding,\r
+ ImageHandle,\r
+ &gDiskIoComponentName,\r
+ NULL,\r
+ NULL\r
+ );\r
+ ASSERT_EFI_ERROR (Status);\r
+\r
+\r
+ return Status;\r
+}\r
+\r
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