-/*++
-
-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;
-}
+/*++\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
+ //\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
+ //\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
+ //\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
+ 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
+ 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
projects / mirror_edk2.git / blobdiff