diff options
Diffstat (limited to 'MdeModulePkg')
| -rw-r--r-- | MdeModulePkg/Universal/Disk/DiskIo/Dxe/DiskIo.c | 737 |
1 files changed, 737 insertions, 0 deletions
diff --git a/MdeModulePkg/Universal/Disk/DiskIo/Dxe/DiskIo.c b/MdeModulePkg/Universal/Disk/DiskIo/Dxe/DiskIo.c new file mode 100644 index 0000000000..0cb49224ca --- /dev/null +++ b/MdeModulePkg/Universal/Disk/DiskIo/Dxe/DiskIo.c @@ -0,0 +1,737 @@ +/** @file
+ 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.
+
+ Copyright (c) 2006 - 2007, 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.
+
+**/
+
+#include "DiskIo.h"
+
+EFI_DRIVER_BINDING_PROTOCOL gDiskIoDriverBinding = {
+ DiskIoDriverBindingSupported,
+ DiskIoDriverBindingStart,
+ DiskIoDriverBindingStop,
+ 0xa,
+ NULL,
+ NULL
+};
+
+DISK_IO_PRIVATE_DATA gDiskIoPrivateDataTemplate = {
+ DISK_IO_PRIVATE_DATA_SIGNATURE,
+ {
+ EFI_DISK_IO_PROTOCOL_REVISION,
+ DiskIoReadDisk,
+ DiskIoWriteDisk
+ },
+ NULL
+};
+
+
+/**
+ Test to see if this driver supports ControllerHandle.
+
+ @param This Protocol instance pointer.
+ @param ControllerHandle Handle of device to test
+ @param RemainingDevicePath Optional parameter use to pick a specific child
+ device to start.
+
+ @retval EFI_SUCCESS This driver supports this device
+ @retval EFI_ALREADY_STARTED This driver is already running on this device
+ @retval other This driver does not support this device
+
+**/
+EFI_STATUS
+EFIAPI
+DiskIoDriverBindingSupported (
+ IN EFI_DRIVER_BINDING_PROTOCOL *This,
+ IN EFI_HANDLE ControllerHandle,
+ IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL
+ )
+{
+ 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;
+}
+
+
+/**
+ Start this driver on ControllerHandle by opening a Block IO protocol and
+ installing a Disk IO protocol on ControllerHandle.
+
+ @param This Protocol instance pointer.
+ @param ControllerHandle Handle of device to bind driver to
+ @param RemainingDevicePath Optional parameter use to pick a specific child
+ device to start.
+
+ @retval EFI_SUCCESS This driver is added to ControllerHandle
+ @retval EFI_ALREADY_STARTED This driver is already running on ControllerHandle
+ @retval other This driver does not support this device
+
+**/
+EFI_STATUS
+EFIAPI
+DiskIoDriverBindingStart (
+ IN EFI_DRIVER_BINDING_PROTOCOL *This,
+ IN EFI_HANDLE ControllerHandle,
+ IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL
+ )
+{
+ 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) {
+ FreePool (Private);
+ }
+
+ gBS->CloseProtocol (
+ ControllerHandle,
+ &gEfiBlockIoProtocolGuid,
+ This->DriverBindingHandle,
+ ControllerHandle
+ );
+ }
+
+ return Status;
+}
+
+
+/**
+ Stop this driver on ControllerHandle by removing Disk IO protocol and closing
+ the Block IO protocol on ControllerHandle.
+
+ @param This Protocol instance pointer.
+ @param ControllerHandle Handle of device to stop driver on
+ @param NumberOfChildren Number of Handles in ChildHandleBuffer. If number of
+ children is zero stop the entire bus driver.
+ @param ChildHandleBuffer List of Child Handles to Stop.
+
+ @retval EFI_SUCCESS This driver is removed ControllerHandle
+ @retval other This driver was not removed from this device
+
+**/
+EFI_STATUS
+EFIAPI
+DiskIoDriverBindingStop (
+ IN EFI_DRIVER_BINDING_PROTOCOL *This,
+ IN EFI_HANDLE ControllerHandle,
+ IN UINTN NumberOfChildren,
+ IN EFI_HANDLE *ChildHandleBuffer
+ )
+{
+ 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)) {
+ FreePool (Private);
+ }
+
+ return Status;
+}
+
+
+
+/**
+ 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.
+
+ @param This Protocol instance pointer.
+ @param MediaId Id of the media, changes every time the media is replaced.
+ @param Offset The starting byte offset to read from
+ @param BufferSize Size of Buffer
+ @param Buffer Buffer containing read data
+
+ @retval EFI_SUCCESS The data was read correctly from the device.
+ @retval EFI_DEVICE_ERROR The device reported an error while performing the read.
+ @retval EFI_NO_MEDIA There is no media in the device.
+ @retval EFI_MEDIA_CHNAGED The MediaId does not matched the current device.
+ @retval EFI_INVALID_PARAMETER The read request contains device addresses that are not
+ valid for the device.
+
+**/
+EFI_STATUS
+EFIAPI
+DiskIoReadDisk (
+ IN EFI_DISK_IO_PROTOCOL *This,
+ IN UINT32 MediaId,
+ IN UINT64 Offset,
+ IN UINTN BufferSize,
+ OUT VOID *Buffer
+ )
+{
+ 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) {
+ FreePool (PreData);
+ }
+
+ return Status;
+}
+
+
+/**
+ 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.
+
+ @param This Protocol instance pointer.
+ @param MediaId Id of the media, changes every time the media is replaced.
+ @param Offset The starting byte offset to read from
+ @param BufferSize Size of Buffer
+ @param Buffer Buffer containing read data
+
+ @retval EFI_SUCCESS The data was written correctly to the device.
+ @retval EFI_WRITE_PROTECTED The device can not be written to.
+ @retval EFI_DEVICE_ERROR The device reported an error while performing the write.
+ @retval EFI_NO_MEDIA There is no media in the device.
+ @retval EFI_MEDIA_CHNAGED The MediaId does not matched the current device.
+ @retval EFI_INVALID_PARAMETER The write request contains device addresses that are not
+ valid for the device.
+
+**/
+EFI_STATUS
+EFIAPI
+DiskIoWriteDisk (
+ IN EFI_DISK_IO_PROTOCOL *This,
+ IN UINT32 MediaId,
+ IN UINT64 Offset,
+ IN UINTN BufferSize,
+ IN VOID *Buffer
+ )
+{
+ 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) {
+ FreePool (PreData);
+ }
+
+ return Status;
+}
+
+
+/**
+ The user Entry Point for module DiskIo. The user code starts with this function.
+
+ @param[in] ImageHandle The firmware allocated handle for the EFI image.
+ @param[in] SystemTable A pointer to the EFI System Table.
+
+ @retval EFI_SUCCESS The entry point is executed successfully.
+ @retval other Some error occurs when executing this entry point.
+
+**/
+EFI_STATUS
+EFIAPI
+InitializeDiskIo (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ EFI_STATUS Status;
+
+ //
+ // Install driver model protocol(s).
+ //
+ Status = EfiLibInstallAllDriverProtocols (
+ ImageHandle,
+ SystemTable,
+ &gDiskIoDriverBinding,
+ ImageHandle,
+ &gDiskIoComponentName,
+ NULL,
+ NULL
+ );
+ ASSERT_EFI_ERROR (Status);
+
+
+ return Status;
+}
+
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