-/*++\r
-\r
-Copyright (c) 2006, 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
-Module Name:\r
-\r
- DiskIo.c\r
-\r
-Abstract:\r
-\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
-\r
- UnderRun - The first byte is not on a sector boundary or the read request is\r
- less than a sector in length.\r
-\r
- Aligned - A read of N contiguous sectors.\r
-\r
- OverRun - The last byte is not on a sector boundary.\r
-\r
---*/\r
-\r
-#include "DiskIo.h"\r
-\r
-//\r
-// Prototypes\r
-// Driver model protocol interface\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\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\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
-//\r
-// Disk I/O Protocol Interface\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\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_DRIVER_BINDING_PROTOCOL gDiskIoDriverBinding = {\r
- DiskIoDriverBindingSupported,\r
- DiskIoDriverBindingStart,\r
- DiskIoDriverBindingStop,\r
- 0x10,\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
-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
-\r
- Routine Description:\r
- Test to see if this driver supports ControllerHandle. Any ControllerHandle\r
- than contains a BlockIo protocol can be supported.\r
-\r
- Arguments:\r
- This - Protocol instance pointer.\r
- ControllerHandle - Handle of device to test.\r
- RemainingDevicePath - Not used.\r
-\r
- Returns:\r
- EFI_SUCCESS - This driver supports this device.\r
- EFI_ALREADY_STARTED - This driver is already running on this device.\r
- other - This driver does not support this device.\r
-\r
---*/\r
-{\r
- EFI_STATUS Status;\r
- EFI_BLOCK_IO_PROTOCOL *BlockIo;\r
-/*\r
- DEBUG_CODE_BEGIN\r
- UINT32 Bar;\r
- UINT32 Foo;\r
- UINT32 HotPlug;\r
-\r
- //\r
- // Get TYPE 0\r
- //\r
- Bar = PcdGet32 (PciExpressBaseVersion);\r
- DEBUG ((EFI_D_ERROR, "PciExpressBaseVersion = %08x\n", Bar));\r
-\r
- //\r
- // Get TYPE 1\r
- //\r
- Foo = PcdGet32 (PciExpressBaseAddress);\r
- DEBUG ((EFI_D_ERROR, "PciExpressBaseAddress = %08x\n", Foo));\r
-\r
- //\r
- // Set TYPE 1\r
- //\r
- PcdSet32 (PciExpressBaseAddress, Foo + 1);\r
-\r
- //\r
- // Get TYPE 1\r
- //\r
- Foo = PcdGet32 (PciExpressBaseAddress);\r
- DEBUG ((EFI_D_ERROR, "PciExpressBaseAddress = %08x\n", Foo));\r
-\r
- //\r
- // Get TYPE 2\r
- //\r
- HotPlug = PcdGet32 (PciExpressBaseHotPlug);\r
- DEBUG ((EFI_D_ERROR, "PciExpressHotPlug = %08x\n", HotPlug));\r
-\r
- //\r
- // Set TYPE 1\r
- //\r
- PcdSet32 (PciExpressBaseHotPlug, HotPlug + 1);\r
-\r
- //\r
- // Get TYPE 1\r
- //\r
- HotPlug = PcdGet32 (PciExpressBaseHotPlug);\r
- DEBUG ((EFI_D_ERROR, "PciExpressHotPlug = %08x\n", HotPlug));\r
-\r
- DEBUG_CODE_END\r
-\r
- DEBUG_CODE_BEGIN\r
- UINT32 MyVariable;\r
-\r
- if (ControllerHandle == NULL) {\r
- MyVariable = 32 * (UINTN)This;\r
- ControllerHandle = (EFI_HANDLE)MyVariable;\r
- DEBUG ((EFI_D_ERROR, "DiskIoSupported-DebugCode. MyVariable = %08x\n", MyVariable));\r
- ASSERT (MyVariable != 32);\r
- }\r
- DEBUG_CODE_END\r
-*/\r
- DEBUG ((EFI_D_ERROR, "DiskIoSupported\n"));\r
-\r
-// Io8Or (0x400, 1);\r
-// Io8And (0x400, 1);\r
-// Io8AndThenOr (0x400, 1, 2);\r
-\r
-// Mmio8Or (0xa0000000, 1);\r
-// Mmio8And (0xa0000000, 1);\r
-// Mmio8AndThenOr (0xa0000000, 1, 2);\r
-\r
-/*\r
- PciRead8 (PCI_LIB_ADDRESS (1,2,3,4));\r
- PciRead16 (PCI_LIB_ADDRESS (1,2,3,4));\r
- PciRead32 (PCI_LIB_ADDRESS (1,2,3,4));\r
-\r
- PciWrite8 (PCI_LIB_ADDRESS (1,2,3,4), 0xAA);\r
- PciWrite16 (PCI_LIB_ADDRESS (1,2,3,4), 0xAA55);\r
- PciWrite32 (PCI_LIB_ADDRESS (1,2,3,4), 0xAA55A55A);\r
-\r
- Pci8Or (PCI_LIB_ADDRESS (1,2,3,4), 0xAA);\r
- Pci8And (PCI_LIB_ADDRESS (1,2,3,4), 0x55);\r
- Pci8AndThenOr (PCI_LIB_ADDRESS (1,2,3,4), 0xAA, 0x55);\r
-\r
- Pci16Or (PCI_LIB_ADDRESS (1,2,3,4), 0xAA55);\r
- Pci16And (PCI_LIB_ADDRESS (1,2,3,4), 0x55AA);\r
- Pci16AndThenOr (PCI_LIB_ADDRESS (1,2,3,4), 0xAA55, 0x55AA);\r
-\r
- Pci32Or (PCI_LIB_ADDRESS (1,2,3,4), 0xAA55A55A);\r
- Pci32And (PCI_LIB_ADDRESS (1,2,3,4), 0x55AA5AA5);\r
- Pci32AndThenOr (PCI_LIB_ADDRESS (1,2,3,4), 0xAA555AA5, 0x55AAA55A);\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
- // 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
-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
-\r
- Routine Description:\r
- Start this driver on ControllerHandle by opening a Block IO protocol and\r
- installing a Disk IO protocol on ControllerHandle.\r
-\r
- Arguments:\r
- This - Protocol instance pointer.\r
- ControllerHandle - Handle of device to bind driver to.\r
- RemainingDevicePath - Not used, always produce all possible children.\r
-\r
- Returns:\r
- EFI_SUCCESS - This driver is added to ControllerHandle.\r
- EFI_ALREADY_STARTED - This driver is already running on ControllerHandle.\r
- other - This driver does not support this device.\r
-\r
---*/\r
-{\r
- EFI_STATUS Status;\r
- DISK_IO_PRIVATE_DATA *Private;\r
-\r
- Private = NULL;\r
-\r
- DEBUG ((EFI_D_ERROR, "DiskIoStart\n"));\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
- // 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
- // 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
- gBS->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
-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
-\r
- Routine Description:\r
- Stop this driver on ControllerHandle by removing Disk IO protocol and closing\r
- the Block IO protocol on ControllerHandle.\r
-\r
- Arguments:\r
- This - Protocol instance pointer.\r
- ControllerHandle - Handle of device to stop driver on.\r
- NumberOfChildren - Not used.\r
- ChildHandleBuffer - Not used.\r
-\r
- Returns:\r
- EFI_SUCCESS - This driver is removed ControllerHandle.\r
- other - This driver was not removed from this device.\r
- EFI_UNSUPPORTED\r
-\r
---*/\r
-{\r
- EFI_STATUS Status;\r
- EFI_DISK_IO_PROTOCOL *DiskIo;\r
- DISK_IO_PRIVATE_DATA *Private;\r
-\r
- DEBUG ((EFI_D_ERROR, "DiskIoStop\n"));\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
- gBS->FreePool (Private);\r
- }\r
-\r
- return Status;\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
-\r
- Routine Description:\r
- Read BufferSize bytes from Offset into Buffer.\r
-\r
- Reads may support reads that are not aligned on\r
- sector boundaries. There are three cases:\r
-\r
- UnderRun - The first byte is not on a sector boundary or the read request is\r
- less than a sector in length.\r
-\r
- Aligned - A read of N contiguous sectors.\r
-\r
- OverRun - The last byte is not on a sector boundary.\r
-\r
-\r
- Arguments:\r
- This - Protocol instance pointer.\r
- MediaId - Id of the media, changes every time the media is replaced.\r
- Offset - The starting byte offset to read from.\r
- BufferSize - Size of Buffer.\r
- Buffer - Buffer containing read data.\r
-\r
- Returns:\r
- EFI_SUCCESS - The data was read correctly from the device.\r
- EFI_DEVICE_ERROR - The device reported an error while performing the read.\r
- EFI_NO_MEDIA - There is no media in the device.\r
- EFI_MEDIA_CHNAGED - The MediaId does not matched the current device.\r
- EFI_INVALID_PARAMETER - The read request contains device addresses that are not\r
- valid for the device.\r
- EFI_OUT_OF_RESOURCES\r
-\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
- DEBUG ((EFI_D_ERROR, "DiskIoReadDisk\n"));\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
- gBS->FreePool (PreData);\r
- }\r
-\r
- return Status;\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
-\r
- Routine Description:\r
- Read BufferSize bytes from Offset into Buffer.\r
-\r
- Writes may require a read modify write to support writes that are not\r
- aligned on sector boundaries. There are three cases:\r
-\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
-\r
- Aligned - A write of N contiguous sectors.\r
-\r
- OverRun - The last byte is not on a sector boundary. Read modified write\r
- required.\r
-\r
- Arguments:\r
- This - Protocol instance pointer.\r
- MediaId - Id of the media, changes every time the media is replaced.\r
- Offset - The starting byte offset to read from.\r
- BufferSize - Size of Buffer.\r
- Buffer - Buffer containing read data.\r
-\r
- Returns:\r
- EFI_SUCCESS - The data was written correctly to the device.\r
- EFI_WRITE_PROTECTED - The device can not be written to.\r
- EFI_DEVICE_ERROR - The device reported an error while performing the write.\r
- EFI_NO_MEDIA - There is no media in the device.\r
- EFI_MEDIA_CHNAGED - The MediaId does not matched the current device.\r
- EFI_INVALID_PARAMETER - The write request contains device addresses that are not\r
- valid for the device.\r
- EFI_OUT_OF_RESOURCES\r
-\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
- DEBUG ((EFI_D_ERROR, "DiskIoWriteDisk\n"));\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
- gBS->FreePool (PreData);\r
- }\r
-\r
- return Status;\r
-}\r
+/*++
+
+Copyright (c) 2006, Intel Corporation
+All rights reserved. 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.
+
+Module Name:
+
+ DiskIo.c
+
+Abstract:
+
+ DiskIo driver that layers it's self on every Block IO protocol in the system.
+ DiskIo converts a block oriented device to a byte oriented device.
+
+ ReadDisk may have to do reads that are not aligned on sector boundaries.
+ There are three cases:
+
+ UnderRun - The first byte is not on a sector boundary or the read request is
+ less than a sector in length.
+
+ Aligned - A read of N contiguous sectors.
+
+ OverRun - The last byte is not on a sector boundary.
+
+--*/
+
+#include "DiskIo.h"
+
+//
+// Prototypes
+// Driver model protocol interface
+//
+EFI_STATUS
+EFIAPI
+DiskIoDriverBindingSupported (
+ IN EFI_DRIVER_BINDING_PROTOCOL *This,
+ IN EFI_HANDLE ControllerHandle,
+ IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
+ );
+
+EFI_STATUS
+EFIAPI
+DiskIoDriverBindingStart (
+ IN EFI_DRIVER_BINDING_PROTOCOL *This,
+ IN EFI_HANDLE ControllerHandle,
+ IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
+ );
+
+EFI_STATUS
+EFIAPI
+DiskIoDriverBindingStop (
+ IN EFI_DRIVER_BINDING_PROTOCOL *This,
+ IN EFI_HANDLE ControllerHandle,
+ IN UINTN NumberOfChildren,
+ IN EFI_HANDLE *ChildHandleBuffer
+ );
+
+//
+// Disk I/O Protocol Interface
+//
+EFI_STATUS
+EFIAPI
+DiskIoReadDisk (
+ IN EFI_DISK_IO_PROTOCOL *This,
+ IN UINT32 MediaId,
+ IN UINT64 Offset,
+ IN UINTN BufferSize,
+ OUT VOID *Buffer
+ );
+
+EFI_STATUS
+EFIAPI
+DiskIoWriteDisk (
+ IN EFI_DISK_IO_PROTOCOL *This,
+ IN UINT32 MediaId,
+ IN UINT64 Offset,
+ IN UINTN BufferSize,
+ IN VOID *Buffer
+ );
+
+EFI_DRIVER_BINDING_PROTOCOL gDiskIoDriverBinding = {
+ DiskIoDriverBindingSupported,
+ DiskIoDriverBindingStart,
+ DiskIoDriverBindingStop,
+ 0x10,
+ NULL,
+ NULL
+};
+
+DISK_IO_PRIVATE_DATA gDiskIoPrivateDataTemplate = {
+ DISK_IO_PRIVATE_DATA_SIGNATURE,
+ {
+ EFI_DISK_IO_PROTOCOL_REVISION,
+ DiskIoReadDisk,
+ DiskIoWriteDisk
+ },
+ NULL
+};
+
+EFI_STATUS
+EFIAPI
+DiskIoDriverBindingSupported (
+ IN EFI_DRIVER_BINDING_PROTOCOL *This,
+ IN EFI_HANDLE ControllerHandle,
+ IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL
+ )
+/*++
+
+ Routine Description:
+ Test to see if this driver supports ControllerHandle. Any ControllerHandle
+ than contains a BlockIo protocol can be supported.
+
+ Arguments:
+ This - Protocol instance pointer.
+ ControllerHandle - Handle of device to test.
+ RemainingDevicePath - Not used.
+
+ Returns:
+ EFI_SUCCESS - This driver supports this device.
+ EFI_ALREADY_STARTED - This driver is already running on this device.
+ other - This driver does not support this device.
+
+--*/
+{
+ EFI_STATUS Status;
+ EFI_BLOCK_IO_PROTOCOL *BlockIo;
+
+ //
+ // Open the IO Abstraction(s) needed to perform the supported test.
+ //
+ Status = gBS->OpenProtocol (
+ ControllerHandle,
+ &gEfiBlockIoProtocolGuid,
+ (VOID **) &BlockIo,
+ This->DriverBindingHandle,
+ ControllerHandle,
+ EFI_OPEN_PROTOCOL_BY_DRIVER
+ );
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+ //
+ // Close the I/O Abstraction(s) used to perform the supported test.
+ //
+ gBS->CloseProtocol (
+ ControllerHandle,
+ &gEfiBlockIoProtocolGuid,
+ This->DriverBindingHandle,
+ ControllerHandle
+ );
+ return EFI_SUCCESS;
+}
+
+EFI_STATUS
+EFIAPI
+DiskIoDriverBindingStart (
+ IN EFI_DRIVER_BINDING_PROTOCOL *This,
+ IN EFI_HANDLE ControllerHandle,
+ IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL
+ )
+/*++
+
+ Routine Description:
+ Start this driver on ControllerHandle by opening a Block IO protocol and
+ installing a Disk IO protocol on ControllerHandle.
+
+ Arguments:
+ This - Protocol instance pointer.
+ ControllerHandle - Handle of device to bind driver to.
+ RemainingDevicePath - Not used, always produce all possible children.
+
+ Returns:
+ EFI_SUCCESS - This driver is added to ControllerHandle.
+ EFI_ALREADY_STARTED - This driver is already running on ControllerHandle.
+ other - This driver does not support this device.
+
+--*/
+{
+ EFI_STATUS Status;
+ DISK_IO_PRIVATE_DATA *Private;
+
+ Private = NULL;
+
+ //
+ // Connect to the Block IO interface on ControllerHandle.
+ //
+ Status = gBS->OpenProtocol (
+ ControllerHandle,
+ &gEfiBlockIoProtocolGuid,
+ (VOID **) &gDiskIoPrivateDataTemplate.BlockIo,
+ This->DriverBindingHandle,
+ ControllerHandle,
+ EFI_OPEN_PROTOCOL_BY_DRIVER
+ );
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+ //
+ // Initialize the Disk IO device instance.
+ //
+ Private = AllocateCopyPool (sizeof (DISK_IO_PRIVATE_DATA), &gDiskIoPrivateDataTemplate);
+ if (Private == NULL) {
+ Status = EFI_OUT_OF_RESOURCES;
+ goto ErrorExit;
+ }
+ //
+ // Install protocol interfaces for the Disk IO device.
+ //
+ Status = gBS->InstallProtocolInterface (
+ &ControllerHandle,
+ &gEfiDiskIoProtocolGuid,
+ EFI_NATIVE_INTERFACE,
+ &Private->DiskIo
+ );
+
+ErrorExit:
+ if (EFI_ERROR (Status)) {
+
+ if (Private != NULL) {
+ gBS->FreePool (Private);
+ }
+
+ gBS->CloseProtocol (
+ ControllerHandle,
+ &gEfiBlockIoProtocolGuid,
+ This->DriverBindingHandle,
+ ControllerHandle
+ );
+ }
+
+ return Status;
+}
+
+EFI_STATUS
+EFIAPI
+DiskIoDriverBindingStop (
+ IN EFI_DRIVER_BINDING_PROTOCOL *This,
+ IN EFI_HANDLE ControllerHandle,
+ IN UINTN NumberOfChildren,
+ IN EFI_HANDLE *ChildHandleBuffer
+ )
+/*++
+
+ Routine Description:
+ Stop this driver on ControllerHandle by removing Disk IO protocol and closing
+ the Block IO protocol on ControllerHandle.
+
+ Arguments:
+ This - Protocol instance pointer.
+ ControllerHandle - Handle of device to stop driver on.
+ NumberOfChildren - Not used.
+ ChildHandleBuffer - Not used.
+
+ Returns:
+ EFI_SUCCESS - This driver is removed ControllerHandle.
+ other - This driver was not removed from this device.
+ EFI_UNSUPPORTED
+
+--*/
+{
+ EFI_STATUS Status;
+ EFI_DISK_IO_PROTOCOL *DiskIo;
+ DISK_IO_PRIVATE_DATA *Private;
+
+ //
+ // Get our context back.
+ //
+ Status = gBS->OpenProtocol (
+ ControllerHandle,
+ &gEfiDiskIoProtocolGuid,
+ (VOID **) &DiskIo,
+ This->DriverBindingHandle,
+ ControllerHandle,
+ EFI_OPEN_PROTOCOL_GET_PROTOCOL
+ );
+ if (EFI_ERROR (Status)) {
+ return EFI_UNSUPPORTED;
+ }
+
+ Private = DISK_IO_PRIVATE_DATA_FROM_THIS (DiskIo);
+
+ Status = gBS->UninstallProtocolInterface (
+ ControllerHandle,
+ &gEfiDiskIoProtocolGuid,
+ &Private->DiskIo
+ );
+ if (!EFI_ERROR (Status)) {
+
+ Status = gBS->CloseProtocol (
+ ControllerHandle,
+ &gEfiBlockIoProtocolGuid,
+ This->DriverBindingHandle,
+ ControllerHandle
+ );
+ }
+
+ if (!EFI_ERROR (Status)) {
+ gBS->FreePool (Private);
+ }
+
+ return Status;
+}
+
+EFI_STATUS
+EFIAPI
+DiskIoReadDisk (
+ IN EFI_DISK_IO_PROTOCOL *This,
+ IN UINT32 MediaId,
+ IN UINT64 Offset,
+ IN UINTN BufferSize,
+ OUT VOID *Buffer
+ )
+/*++
+
+ Routine Description:
+ Read BufferSize bytes from Offset into Buffer.
+
+ Reads may support reads that are not aligned on
+ sector boundaries. There are three cases:
+
+ UnderRun - The first byte is not on a sector boundary or the read request is
+ less than a sector in length.
+
+ Aligned - A read of N contiguous sectors.
+
+ OverRun - The last byte is not on a sector boundary.
+
+
+ Arguments:
+ This - Protocol instance pointer.
+ MediaId - Id of the media, changes every time the media is replaced.
+ Offset - The starting byte offset to read from.
+ BufferSize - Size of Buffer.
+ Buffer - Buffer containing read data.
+
+ Returns:
+ EFI_SUCCESS - The data was read correctly from the device.
+ EFI_DEVICE_ERROR - The device reported an error while performing the read.
+ EFI_NO_MEDIA - There is no media in the device.
+ EFI_MEDIA_CHNAGED - The MediaId does not matched the current device.
+ EFI_INVALID_PARAMETER - The read request contains device addresses that are not
+ valid for the device.
+ EFI_OUT_OF_RESOURCES
+
+--*/
+{
+ EFI_STATUS Status;
+ DISK_IO_PRIVATE_DATA *Private;
+ EFI_BLOCK_IO_PROTOCOL *BlockIo;
+ EFI_BLOCK_IO_MEDIA *Media;
+ UINT32 BlockSize;
+ UINT64 Lba;
+ UINT64 OverRunLba;
+ UINT32 UnderRun;
+ UINT32 OverRun;
+ BOOLEAN TransactionComplete;
+ UINTN WorkingBufferSize;
+ UINT8 *WorkingBuffer;
+ UINTN Length;
+ UINT8 *Data;
+ UINT8 *PreData;
+ UINTN IsBufferAligned;
+ UINTN DataBufferSize;
+ BOOLEAN LastRead;
+
+ Private = DISK_IO_PRIVATE_DATA_FROM_THIS (This);
+
+ BlockIo = Private->BlockIo;
+ Media = BlockIo->Media;
+ BlockSize = Media->BlockSize;
+
+ if (Media->MediaId != MediaId) {
+ return EFI_MEDIA_CHANGED;
+ }
+
+ WorkingBuffer = Buffer;
+ WorkingBufferSize = BufferSize;
+
+ //
+ // Allocate a temporary buffer for operation
+ //
+ DataBufferSize = BlockSize * DATA_BUFFER_BLOCK_NUM;
+
+ if (Media->IoAlign > 1) {
+ PreData = AllocatePool (DataBufferSize + Media->IoAlign);
+ Data = PreData - ((UINTN) PreData & (Media->IoAlign - 1)) + Media->IoAlign;
+ } else {
+ PreData = AllocatePool (DataBufferSize);
+ Data = PreData;
+ }
+
+ if (PreData == NULL) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ Lba = DivU64x32Remainder (Offset, BlockSize, &UnderRun);
+
+ Length = BlockSize - UnderRun;
+ TransactionComplete = FALSE;
+
+ Status = EFI_SUCCESS;
+ if (UnderRun != 0) {
+ //
+ // Offset starts in the middle of an Lba, so read the entire block.
+ //
+ Status = BlockIo->ReadBlocks (
+ BlockIo,
+ MediaId,
+ Lba,
+ BlockSize,
+ Data
+ );
+
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+
+ if (Length > BufferSize) {
+ Length = BufferSize;
+ TransactionComplete = TRUE;
+ }
+
+ CopyMem (WorkingBuffer, Data + UnderRun, Length);
+
+ WorkingBuffer += Length;
+
+ WorkingBufferSize -= Length;
+ if (WorkingBufferSize == 0) {
+ goto Done;
+ }
+
+ Lba += 1;
+ }
+
+ OverRunLba = Lba + DivU64x32Remainder (WorkingBufferSize, BlockSize, &OverRun);
+
+ if (!TransactionComplete && WorkingBufferSize >= BlockSize) {
+ //
+ // If the DiskIo maps directly to a BlockIo device do the read.
+ //
+ if (OverRun != 0) {
+ WorkingBufferSize -= OverRun;
+ }
+ //
+ // Check buffer alignment
+ //
+ IsBufferAligned = (UINTN) WorkingBuffer & (UINTN) (Media->IoAlign - 1);
+
+ if (Media->IoAlign <= 1 || IsBufferAligned == 0) {
+ //
+ // Alignment is satisfied, so read them together
+ //
+ Status = BlockIo->ReadBlocks (
+ BlockIo,
+ MediaId,
+ Lba,
+ WorkingBufferSize,
+ WorkingBuffer
+ );
+
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+
+ WorkingBuffer += WorkingBufferSize;
+
+ } else {
+ //
+ // Use the allocated buffer instead of the original buffer
+ // to avoid alignment issue.
+ // Here, the allocated buffer (8-byte align) can satisfy the alignment
+ //
+ LastRead = FALSE;
+ do {
+ if (WorkingBufferSize <= DataBufferSize) {
+ //
+ // It is the last calling to readblocks in this loop
+ //
+ DataBufferSize = WorkingBufferSize;
+ LastRead = TRUE;
+ }
+
+ Status = BlockIo->ReadBlocks (
+ BlockIo,
+ MediaId,
+ Lba,
+ DataBufferSize,
+ Data
+ );
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+
+ CopyMem (WorkingBuffer, Data, DataBufferSize);
+ WorkingBufferSize -= DataBufferSize;
+ WorkingBuffer += DataBufferSize;
+ Lba += DATA_BUFFER_BLOCK_NUM;
+ } while (!LastRead);
+ }
+ }
+
+ if (!TransactionComplete && OverRun != 0) {
+ //
+ // Last read is not a complete block.
+ //
+ Status = BlockIo->ReadBlocks (
+ BlockIo,
+ MediaId,
+ OverRunLba,
+ BlockSize,
+ Data
+ );
+
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+
+ CopyMem (WorkingBuffer, Data, OverRun);
+ }
+
+Done:
+ if (PreData != NULL) {
+ gBS->FreePool (PreData);
+ }
+
+ return Status;
+}
+
+EFI_STATUS
+EFIAPI
+DiskIoWriteDisk (
+ IN EFI_DISK_IO_PROTOCOL *This,
+ IN UINT32 MediaId,
+ IN UINT64 Offset,
+ IN UINTN BufferSize,
+ IN VOID *Buffer
+ )
+/*++
+
+ Routine Description:
+ Read BufferSize bytes from Offset into Buffer.
+
+ Writes may require a read modify write to support writes that are not
+ aligned on sector boundaries. There are three cases:
+
+ UnderRun - The first byte is not on a sector boundary or the write request
+ is less than a sector in length. Read modify write is required.
+
+ Aligned - A write of N contiguous sectors.
+
+ OverRun - The last byte is not on a sector boundary. Read modified write
+ required.
+
+ Arguments:
+ This - Protocol instance pointer.
+ MediaId - Id of the media, changes every time the media is replaced.
+ Offset - The starting byte offset to read from.
+ BufferSize - Size of Buffer.
+ Buffer - Buffer containing read data.
+
+ Returns:
+ EFI_SUCCESS - The data was written correctly to the device.
+ EFI_WRITE_PROTECTED - The device can not be written to.
+ EFI_DEVICE_ERROR - The device reported an error while performing the write.
+ EFI_NO_MEDIA - There is no media in the device.
+ EFI_MEDIA_CHNAGED - The MediaId does not matched the current device.
+ EFI_INVALID_PARAMETER - The write request contains device addresses that are not
+ valid for the device.
+ EFI_OUT_OF_RESOURCES
+
+--*/
+{
+ EFI_STATUS Status;
+ DISK_IO_PRIVATE_DATA *Private;
+ EFI_BLOCK_IO_PROTOCOL *BlockIo;
+ EFI_BLOCK_IO_MEDIA *Media;
+ UINT32 BlockSize;
+ UINT64 Lba;
+ UINT64 OverRunLba;
+ UINT32 UnderRun;
+ UINT32 OverRun;
+ BOOLEAN TransactionComplete;
+ UINTN WorkingBufferSize;
+ UINT8 *WorkingBuffer;
+ UINTN Length;
+ UINT8 *Data;
+ UINT8 *PreData;
+ UINTN IsBufferAligned;
+ UINTN DataBufferSize;
+ BOOLEAN LastWrite;
+
+ Private = DISK_IO_PRIVATE_DATA_FROM_THIS (This);
+
+ BlockIo = Private->BlockIo;
+ Media = BlockIo->Media;
+ BlockSize = Media->BlockSize;
+
+ if (Media->ReadOnly) {
+ return EFI_WRITE_PROTECTED;
+ }
+
+ if (Media->MediaId != MediaId) {
+ return EFI_MEDIA_CHANGED;
+ }
+
+ DataBufferSize = BlockSize * DATA_BUFFER_BLOCK_NUM;
+
+ if (Media->IoAlign > 1) {
+ PreData = AllocatePool (DataBufferSize + Media->IoAlign);
+ Data = PreData - ((UINTN) PreData & (Media->IoAlign - 1)) + Media->IoAlign;
+ } else {
+ PreData = AllocatePool (DataBufferSize);
+ Data = PreData;
+ }
+
+ if (PreData == NULL) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ WorkingBuffer = Buffer;
+ WorkingBufferSize = BufferSize;
+
+ Lba = DivU64x32Remainder (Offset, BlockSize, &UnderRun);
+
+ Length = BlockSize - UnderRun;
+ TransactionComplete = FALSE;
+
+ Status = EFI_SUCCESS;
+ if (UnderRun != 0) {
+ //
+ // Offset starts in the middle of an Lba, so do read modify write.
+ //
+ Status = BlockIo->ReadBlocks (
+ BlockIo,
+ MediaId,
+ Lba,
+ BlockSize,
+ Data
+ );
+
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+
+ if (Length > BufferSize) {
+ Length = BufferSize;
+ TransactionComplete = TRUE;
+ }
+
+ CopyMem (Data + UnderRun, WorkingBuffer, Length);
+
+ Status = BlockIo->WriteBlocks (
+ BlockIo,
+ MediaId,
+ Lba,
+ BlockSize,
+ Data
+ );
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+
+ WorkingBuffer += Length;
+ WorkingBufferSize -= Length;
+ if (WorkingBufferSize == 0) {
+ goto Done;
+ }
+
+ Lba += 1;
+ }
+
+ OverRunLba = Lba + DivU64x32Remainder (WorkingBufferSize, BlockSize, &OverRun);
+
+ if (!TransactionComplete && WorkingBufferSize >= BlockSize) {
+ //
+ // If the DiskIo maps directly to a BlockIo device do the write.
+ //
+ if (OverRun != 0) {
+ WorkingBufferSize -= OverRun;
+ }
+ //
+ // Check buffer alignment
+ //
+ IsBufferAligned = (UINTN) WorkingBuffer & (UINTN) (Media->IoAlign - 1);
+
+ if (Media->IoAlign <= 1 || IsBufferAligned == 0) {
+ //
+ // Alignment is satisfied, so write them together
+ //
+ Status = BlockIo->WriteBlocks (
+ BlockIo,
+ MediaId,
+ Lba,
+ WorkingBufferSize,
+ WorkingBuffer
+ );
+
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+
+ WorkingBuffer += WorkingBufferSize;
+
+ } else {
+ //
+ // The buffer parameter is not aligned with the request
+ // So use the allocated instead.
+ // It can fit almost all the cases.
+ //
+ LastWrite = FALSE;
+ do {
+ if (WorkingBufferSize <= DataBufferSize) {
+ //
+ // It is the last calling to writeblocks in this loop
+ //
+ DataBufferSize = WorkingBufferSize;
+ LastWrite = TRUE;
+ }
+
+ CopyMem (Data, WorkingBuffer, DataBufferSize);
+ Status = BlockIo->WriteBlocks (
+ BlockIo,
+ MediaId,
+ Lba,
+ DataBufferSize,
+ Data
+ );
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+
+ WorkingBufferSize -= DataBufferSize;
+ WorkingBuffer += DataBufferSize;
+ Lba += DATA_BUFFER_BLOCK_NUM;
+ } while (!LastWrite);
+ }
+ }
+
+ if (!TransactionComplete && OverRun != 0) {
+ //
+ // Last bit is not a complete block, so do a read modify write.
+ //
+ Status = BlockIo->ReadBlocks (
+ BlockIo,
+ MediaId,
+ OverRunLba,
+ BlockSize,
+ Data
+ );
+
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+
+ CopyMem (Data, WorkingBuffer, OverRun);
+
+ Status = BlockIo->WriteBlocks (
+ BlockIo,
+ MediaId,
+ OverRunLba,
+ BlockSize,
+ Data
+ );
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+ }
+
+Done:
+ if (PreData != NULL) {
+ gBS->FreePool (PreData);
+ }
+
+ return Status;
+}
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