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audk/MdeModulePkg/Universal/FirmwareVolume/FaultTolerantWriteDxe/FtwLite.c

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/** @file
This is a simple fault tolerant write driver.
And it only supports write BufferSize <= SpareAreaLength.
This boot service only protocol provides fault tolerant write capability for
block devices. The protocol has internal non-volatile intermediate storage
of the data and private information. It should be able to recover
automatically from a critical fault, such as power failure.
The implementation uses an FTW Lite (Fault Tolerant Write) Work Space.
This work space is a memory copy of the work space on the Woring Block,
the size of the work space is the FTW_WORK_SPACE_SIZE bytes.
Copyright (c) 2006 - 2008, 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 <FtwLite.h>
//
// In write function, we should check the target range to prevent the user
// from writing Spare block and Working space directly.
//
//
// Fault Tolerant Write Protocol API
//
/**
Starts a target block update. This function will record data about write
in fault tolerant storage and will complete the write in a recoverable
manner, ensuring at all times that either the original contents or
the modified contents are available.
@param This Calling context
@param FvbHandle The handle of FVB protocol that provides services for
reading, writing, and erasing the target block.
@param Lba The logical block address of the target block.
@param Offset The offset within the target block to place the data.
@param NumBytes The number of bytes to write to the target block.
@param Buffer The data to write.
@retval EFI_SUCCESS The function completed successfully
@retval EFI_BAD_BUFFER_SIZE The write would span a target block, which is not
a valid action.
@retval EFI_ACCESS_DENIED No writes have been allocated.
@retval EFI_NOT_FOUND Cannot find FVB by handle.
@retval EFI_OUT_OF_RESOURCES Cannot allocate memory.
@retval EFI_ABORTED The function could not complete successfully.
**/
EFI_STATUS
EFIAPI
FtwLiteWrite (
IN EFI_FTW_LITE_PROTOCOL *This,
IN EFI_HANDLE FvbHandle,
IN EFI_LBA Lba,
IN UINTN Offset,
IN OUT UINTN *NumBytes,
IN VOID *Buffer
)
{
EFI_STATUS Status;
EFI_FTW_LITE_DEVICE *FtwLiteDevice;
EFI_FTW_LITE_RECORD *Record;
EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *Fvb;
EFI_PHYSICAL_ADDRESS FvbPhysicalAddress;
UINTN MyLength;
UINTN MyOffset;
UINTN MyBufferSize;
UINT8 *MyBuffer;
UINTN SpareBufferSize;
UINT8 *SpareBuffer;
UINTN Index;
UINT8 *Ptr;
EFI_DEV_PATH_PTR DevPtr;
//
// Refresh work space and get last record
//
FtwLiteDevice = FTW_LITE_CONTEXT_FROM_THIS (This);
Status = WorkSpaceRefresh (FtwLiteDevice);
if (EFI_ERROR (Status)) {
return EFI_ABORTED;
}
Record = FtwLiteDevice->FtwLastRecord;
//
// Check the flags of last write record
//
if ((Record->WriteAllocated == FTW_VALID_STATE) || (Record->SpareCompleted == FTW_VALID_STATE)) {
return EFI_ACCESS_DENIED;
}
//
// IF former record has completed, THEN use next record
//
if (Record->WriteCompleted == FTW_VALID_STATE) {
Record++;
FtwLiteDevice->FtwLastRecord = Record;
}
MyOffset = (UINT8 *) Record - FtwLiteDevice->FtwWorkSpace;
//
// Check if the input data can fit within the target block
//
if ((Offset +*NumBytes) > FtwLiteDevice->SpareAreaLength) {
return EFI_BAD_BUFFER_SIZE;
}
//
// Check if there is enough free space for allocate a record
//
if ((MyOffset + WRITE_TOTAL_SIZE) > FtwLiteDevice->FtwWorkSpaceSize) {
Status = FtwReclaimWorkSpace (FtwLiteDevice);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_ERROR, "FtwLite: Reclaim work space - %r", Status));
return EFI_ABORTED;
}
}
//
// Get the FVB protocol by handle
//
Status = FtwGetFvbByHandle (FvbHandle, &Fvb);
if (EFI_ERROR (Status)) {
return EFI_NOT_FOUND;
}
//
// Allocate a write record in workspace.
// Update Header->WriteAllocated as VALID
//
Status = FtwUpdateFvState (
FtwLiteDevice->FtwFvBlock,
FtwLiteDevice->FtwWorkSpaceLba,
FtwLiteDevice->FtwWorkSpaceBase + MyOffset,
WRITE_ALLOCATED
);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_FTW_LITE, "FtwLite: Allocate record - %r\n", Status));
return EFI_ABORTED;
}
Record->WriteAllocated = FTW_VALID_STATE;
//
// Prepare data of write record, filling DevPath with memory mapped address.
//
DevPtr.MemMap = (MEMMAP_DEVICE_PATH *) &Record->DevPath;
DevPtr.MemMap->Header.Type = HARDWARE_DEVICE_PATH;
DevPtr.MemMap->Header.SubType = HW_MEMMAP_DP;
SetDevicePathNodeLength (&DevPtr.MemMap->Header, sizeof (MEMMAP_DEVICE_PATH));
Status = Fvb->GetPhysicalAddress (Fvb, &FvbPhysicalAddress);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_FTW_LITE, "FtwLite: Get FVB physical address - %r\n", Status));
return EFI_ABORTED;
}
DevPtr.MemMap->MemoryType = EfiMemoryMappedIO;
DevPtr.MemMap->StartingAddress = FvbPhysicalAddress;
DevPtr.MemMap->EndingAddress = FvbPhysicalAddress +*NumBytes;
//
// ignored!
//
Record->Lba = Lba;
Record->Offset = Offset;
Record->NumBytes = *NumBytes;
//
// Write the record to the work space.
//
MyOffset = (UINT8 *) Record - FtwLiteDevice->FtwWorkSpace;
MyLength = FTW_LITE_RECORD_SIZE;
Status = FtwLiteDevice->FtwFvBlock->Write (
FtwLiteDevice->FtwFvBlock,
FtwLiteDevice->FtwWorkSpaceLba,
FtwLiteDevice->FtwWorkSpaceBase + MyOffset,
&MyLength,
(UINT8 *) Record
);
if (EFI_ERROR (Status)) {
return EFI_ABORTED;
}
//
// Record has been written to working block, then write data.
//
//
// Allocate a memory buffer
//
MyBufferSize = FtwLiteDevice->SpareAreaLength;
MyBuffer = AllocatePool (MyBufferSize);
if (MyBuffer == NULL) {
return EFI_OUT_OF_RESOURCES;
}
//
// Starting at Lba, if the number of the rest blocks on Fvb is less
// than NumberOfSpareBlock.
//
//
// Read all original data from target block to memory buffer
//
if (IsInWorkingBlock (FtwLiteDevice, Fvb, Lba)) {
//
// If target block falls into working block, we must follow the process of
// updating working block.
//
Ptr = MyBuffer;
for (Index = 0; Index < FtwLiteDevice->NumberOfSpareBlock; Index += 1) {
MyLength = FtwLiteDevice->SizeOfSpareBlock;
Status = FtwLiteDevice->FtwFvBlock->Read (
FtwLiteDevice->FtwFvBlock,
FtwLiteDevice->FtwWorkBlockLba + Index,
0,
&MyLength,
Ptr
);
if (EFI_ERROR (Status)) {
FreePool (MyBuffer);
return EFI_ABORTED;
}
Ptr += MyLength;
}
//
// Update Offset by adding the offset from the start LBA of working block to
// the target LBA. The target block can not span working block!
//
Offset = (((UINTN) (Lba - FtwLiteDevice->FtwWorkBlockLba)) * FtwLiteDevice->SizeOfSpareBlock + Offset);
ASSERT ((Offset +*NumBytes) <= FtwLiteDevice->SpareAreaLength);
} else {
Ptr = MyBuffer;
for (Index = 0; Index < FtwLiteDevice->NumberOfSpareBlock; Index += 1) {
MyLength = FtwLiteDevice->SizeOfSpareBlock;
Status = Fvb->Read (Fvb, Lba + Index, 0, &MyLength, Ptr);
if (EFI_ERROR (Status)) {
FreePool (MyBuffer);
return EFI_ABORTED;
}
Ptr += MyLength;
}
}
//
// Overwrite the updating range data with
// the input buffer content
//
CopyMem (MyBuffer + Offset, Buffer, *NumBytes);
//
// Try to keep the content of spare block
// Save spare block into a spare backup memory buffer (Sparebuffer)
//
SpareBufferSize = FtwLiteDevice->SpareAreaLength;
SpareBuffer = AllocatePool (SpareBufferSize);
if (SpareBuffer == NULL) {
FreePool (MyBuffer);
return EFI_OUT_OF_RESOURCES;
}
Ptr = SpareBuffer;
for (Index = 0; Index < FtwLiteDevice->NumberOfSpareBlock; Index += 1) {
MyLength = FtwLiteDevice->SizeOfSpareBlock;
Status = FtwLiteDevice->FtwBackupFvb->Read (
FtwLiteDevice->FtwBackupFvb,
FtwLiteDevice->FtwSpareLba + Index,
0,
&MyLength,
Ptr
);
if (EFI_ERROR (Status)) {
FreePool (MyBuffer);
FreePool (SpareBuffer);
return EFI_ABORTED;
}
Ptr += MyLength;
}
//
// Write the memory buffer to spare block
// Don't forget to erase Flash first.
//
Status = FtwEraseSpareBlock (FtwLiteDevice);
Ptr = MyBuffer;
for (Index = 0; Index < FtwLiteDevice->NumberOfSpareBlock; Index += 1) {
MyLength = FtwLiteDevice->SizeOfSpareBlock;
Status = FtwLiteDevice->FtwBackupFvb->Write (
FtwLiteDevice->FtwBackupFvb,
FtwLiteDevice->FtwSpareLba + Index,
0,
&MyLength,
Ptr
);
if (EFI_ERROR (Status)) {
FreePool (MyBuffer);
FreePool (SpareBuffer);
return EFI_ABORTED;
}
Ptr += MyLength;
}
//
// Free MyBuffer
//
FreePool (MyBuffer);
//
// Set the SpareCompleteD in the FTW record,
//
MyOffset = (UINT8 *) Record - FtwLiteDevice->FtwWorkSpace;
Status = FtwUpdateFvState (
FtwLiteDevice->FtwFvBlock,
FtwLiteDevice->FtwWorkSpaceLba,
FtwLiteDevice->FtwWorkSpaceBase + MyOffset,
SPARE_COMPLETED
);
if (EFI_ERROR (Status)) {
FreePool (SpareBuffer);
return EFI_ABORTED;
}
Record->SpareCompleted = FTW_VALID_STATE;
//
// Since the content has already backuped in spare block, the write is
// guaranteed to be completed with fault tolerant manner.
//
Status = FtwWriteRecord (FtwLiteDevice, Fvb);
if (EFI_ERROR (Status)) {
FreePool (SpareBuffer);
return EFI_ABORTED;
}
Record++;
FtwLiteDevice->FtwLastRecord = Record;
//
// Restore spare backup buffer into spare block , if no failure happened during FtwWrite.
//
Status = FtwEraseSpareBlock (FtwLiteDevice);
Ptr = SpareBuffer;
for (Index = 0; Index < FtwLiteDevice->NumberOfSpareBlock; Index += 1) {
MyLength = FtwLiteDevice->SizeOfSpareBlock;
Status = FtwLiteDevice->FtwBackupFvb->Write (
FtwLiteDevice->FtwBackupFvb,
FtwLiteDevice->FtwSpareLba + Index,
0,
&MyLength,
Ptr
);
if (EFI_ERROR (Status)) {
FreePool (SpareBuffer);
return EFI_ABORTED;
}
Ptr += MyLength;
}
//
// All success.
//
FreePool (SpareBuffer);
DEBUG (
(EFI_D_FTW_LITE,
"FtwLite: Write() success, (Lba:Offset)=(%lx:0x%x), NumBytes: 0x%x\n",
Lba,
Offset,
*NumBytes)
);
return EFI_SUCCESS;
}
/**
Write a record with fault tolerant mannaer.
Since the content has already backuped in spare block, the write is
guaranteed to be completed with fault tolerant manner.
@param FtwLiteDevice The private data of FTW_LITE driver
@param Fvb The FVB protocol that provides services for
reading, writing, and erasing the target block.
@retval EFI_SUCCESS The function completed successfully
@retval EFI_ABORTED The function could not complete successfully
**/
EFI_STATUS
FtwWriteRecord (
IN EFI_FTW_LITE_DEVICE *FtwLiteDevice,
IN EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *Fvb
)
{
EFI_STATUS Status;
EFI_FTW_LITE_RECORD *Record;
EFI_LBA WorkSpaceLbaOffset;
UINTN Offset;
//
// Spare Complete but Destination not complete,
// Recover the targt block with the spare block.
//
Record = FtwLiteDevice->FtwLastRecord;
//
// IF target block is working block, THEN Flush Spare Block To Working Block;
// ELSE IF target block is boot block, THEN Flush Spare Block To boot Block;
// ELSE flush spare block to normal target block.ENDIF
//
if (IsInWorkingBlock (FtwLiteDevice, Fvb, Record->Lba)) {
//
// If target block is working block, Attention:
// it's required to set SPARE_COMPLETED to spare block.
//
WorkSpaceLbaOffset = FtwLiteDevice->FtwWorkSpaceLba - FtwLiteDevice->FtwWorkBlockLba;
Offset = (UINT8 *) Record - FtwLiteDevice->FtwWorkSpace;
Status = FtwUpdateFvState (
FtwLiteDevice->FtwBackupFvb,
FtwLiteDevice->FtwSpareLba + WorkSpaceLbaOffset,
FtwLiteDevice->FtwWorkSpaceBase + Offset,
SPARE_COMPLETED
);
ASSERT_EFI_ERROR (Status);
Status = FlushSpareBlockToWorkingBlock (FtwLiteDevice);
} else if (IsBootBlock (FtwLiteDevice, Fvb, Record->Lba)) {
//
// Update boot block
//
Status = FlushSpareBlockToBootBlock (FtwLiteDevice);
} else {
//
// Update blocks other than working block or boot block
//
Status = FlushSpareBlockToTargetBlock (FtwLiteDevice, Fvb, Record->Lba);
}
ASSERT_EFI_ERROR (Status);
//
// Set WriteCompleted flag in record
//
Offset = (UINT8 *) Record - FtwLiteDevice->FtwWorkSpace;
Status = FtwUpdateFvState (
FtwLiteDevice->FtwFvBlock,
FtwLiteDevice->FtwWorkSpaceLba,
FtwLiteDevice->FtwWorkSpaceBase + Offset,
WRITE_COMPLETED
);
ASSERT_EFI_ERROR (Status);
Record->WriteCompleted = FTW_VALID_STATE;
return EFI_SUCCESS;
}
/**
Restarts a previously interrupted write. The caller must provide the
block protocol needed to complete the interrupted write.
@param FtwLiteDevice The private data of FTW_LITE driver
FvbHandle - The handle of FVB protocol that provides services for
reading, writing, and erasing the target block.
@retval EFI_SUCCESS The function completed successfully
@retval EFI_ACCESS_DENIED No pending writes exist
@retval EFI_NOT_FOUND FVB protocol not found by the handle
@retval EFI_ABORTED The function could not complete successfully
**/
EFI_STATUS
FtwRestart (
IN EFI_FTW_LITE_DEVICE *FtwLiteDevice
)
{
EFI_STATUS Status;
EFI_FTW_LITE_RECORD *Record;
EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *Fvb;
EFI_DEV_PATH_PTR DevPathPtr;
//
// Spare Completed but Destination not complete,
// Recover the targt block with the spare block.
//
Record = FtwLiteDevice->FtwLastRecord;
//
// Only support memory mapped FVB device path by now.
//
DevPathPtr.MemMap = (MEMMAP_DEVICE_PATH *) &Record->DevPath;
if (!((DevPathPtr.MemMap->Header.Type == HARDWARE_DEVICE_PATH) && (DevPathPtr.MemMap->Header.SubType == HW_MEMMAP_DP))
) {
DEBUG ((EFI_D_FTW_LITE, "FtwLite: FVB Device Path is not memory mapped\n"));
return EFI_ABORTED;
}
Status = GetFvbByAddress (DevPathPtr.MemMap->StartingAddress, &Fvb);
if (EFI_ERROR (Status)) {
return EFI_NOT_FOUND;
}
//
// Since the content has already backuped in spare block, the write is
// guaranteed to be completed with fault tolerant manner.
//
Status = FtwWriteRecord (FtwLiteDevice, Fvb);
DEBUG ((EFI_D_FTW_INFO, "FtwLite: Restart() - %r\n", Status));
Record++;
FtwLiteDevice->FtwLastRecord = Record;
//
// Erase Spare block
// This is restart, no need to keep spareblock content.
//
FtwEraseSpareBlock (FtwLiteDevice);
return Status;
}
/**
Aborts all previous allocated writes.
@param FtwLiteDevice The private data of FTW_LITE driver
@retval EFI_SUCCESS The function completed successfully
@retval EFI_ABORTED The function could not complete successfully.
@retval EFI_NOT_FOUND No allocated writes exist.
**/
EFI_STATUS
FtwAbort (
IN EFI_FTW_LITE_DEVICE *FtwLiteDevice
)
{
EFI_STATUS Status;
UINTN Offset;
if (FtwLiteDevice->FtwLastRecord->WriteCompleted == FTW_VALID_STATE) {
return EFI_NOT_FOUND;
}
//
// Update the complete state of the header as VALID and abort.
//
Offset = (UINT8 *) FtwLiteDevice->FtwLastRecord - FtwLiteDevice->FtwWorkSpace;
Status = FtwUpdateFvState (
FtwLiteDevice->FtwFvBlock,
FtwLiteDevice->FtwWorkSpaceLba,
FtwLiteDevice->FtwWorkSpaceBase + Offset,
WRITE_COMPLETED
);
if (EFI_ERROR (Status)) {
return EFI_ABORTED;
}
FtwLiteDevice->FtwLastRecord->WriteCompleted = FTW_VALID_STATE;
Status = FtwGetLastRecord (FtwLiteDevice, &FtwLiteDevice->FtwLastRecord);
//
// Erase the spare block
//
Status = FtwEraseSpareBlock (FtwLiteDevice);
DEBUG ((EFI_D_FTW_INFO, "FtwLite: Abort() success \n"));
return EFI_SUCCESS;
}
/**
This function is the entry point of the Fault Tolerant Write driver.
@param ImageHandle EFI_HANDLE: A handle for the image that is initializing
this driver
@param SystemTable EFI_SYSTEM_TABLE: A pointer to the EFI system table
@retval EFI_SUCCESS FTW has finished the initialization
@retval EFI_ABORTED FTW initialization error
**/
EFI_STATUS
EFIAPI
InitializeFtwLite (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *Fvb;
UINTN Index;
EFI_HANDLE *HandleBuffer;
UINTN HandleCount;
EFI_FIRMWARE_VOLUME_HEADER *FwVolHeader;
EFI_PHYSICAL_ADDRESS BaseAddress;
EFI_FTW_LITE_DEVICE *FtwLiteDevice;
EFI_FTW_LITE_RECORD *Record;
UINTN Length;
EFI_STATUS Status;
UINTN Offset;
EFI_FV_BLOCK_MAP_ENTRY *FvbMapEntry;
UINT32 LbaIndex;
//
// Allocate Private data of this driver,
// INCLUDING THE FtwWorkSpace[FTW_WORK_SPACE_SIZE].
//
FtwLiteDevice = NULL;
FtwLiteDevice = AllocatePool (sizeof (EFI_FTW_LITE_DEVICE) + FTW_WORK_SPACE_SIZE);
if (FtwLiteDevice != NULL) {
Status = EFI_SUCCESS;
} else {
Status = EFI_OUT_OF_RESOURCES;
}
ASSERT_EFI_ERROR (Status);
ZeroMem (FtwLiteDevice, sizeof (EFI_FTW_LITE_DEVICE));
FtwLiteDevice->Signature = FTW_LITE_DEVICE_SIGNATURE;
//
// Initialize other parameters, and set WorkSpace as FTW_ERASED_BYTE.
//
FtwLiteDevice->FtwWorkSpace = (UINT8 *) (FtwLiteDevice + 1);
FtwLiteDevice->FtwWorkSpaceSize = FTW_WORK_SPACE_SIZE;
SetMem (
FtwLiteDevice->FtwWorkSpace,
FtwLiteDevice->FtwWorkSpaceSize,
FTW_ERASED_BYTE
);
FtwLiteDevice->FtwWorkSpaceHeader = (EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER *) FtwLiteDevice->FtwWorkSpace;
FtwLiteDevice->FtwLastRecord = NULL;
FtwLiteDevice->WorkSpaceAddress = (EFI_PHYSICAL_ADDRESS) PcdGet32 (PcdFlashNvStorageFtwWorkingBase);
FtwLiteDevice->WorkSpaceLength = (UINTN) PcdGet32 (PcdFlashNvStorageFtwWorkingSize);
FtwLiteDevice->SpareAreaAddress = (EFI_PHYSICAL_ADDRESS) PcdGet32 (PcdFlashNvStorageFtwSpareBase);
FtwLiteDevice->SpareAreaLength = (UINTN) PcdGet32 (PcdFlashNvStorageFtwSpareSize);
ASSERT ((FtwLiteDevice->WorkSpaceLength != 0) && (FtwLiteDevice->SpareAreaLength != 0));
//
// Locate FVB protocol
//
Status = gBS->LocateHandleBuffer (
ByProtocol,
&gEfiFirmwareVolumeBlockProtocolGuid,
NULL,
&HandleCount,
&HandleBuffer
);
ASSERT_EFI_ERROR (Status);
ASSERT (HandleCount > 0);
FtwLiteDevice->FtwFvBlock = NULL;
FtwLiteDevice->FtwBackupFvb = NULL;
FtwLiteDevice->FtwWorkSpaceLba = (EFI_LBA) (-1);
FtwLiteDevice->FtwSpareLba = (EFI_LBA) (-1);
for (Index = 0; Index < HandleCount; Index += 1) {
Status = gBS->HandleProtocol (
HandleBuffer[Index],
&gEfiFirmwareVolumeBlockProtocolGuid,
(VOID **) &Fvb
);
ASSERT_EFI_ERROR (Status);
Status = Fvb->GetPhysicalAddress (Fvb, &BaseAddress);
if (EFI_ERROR (Status)) {
continue;
}
FwVolHeader = (EFI_FIRMWARE_VOLUME_HEADER *) ((UINTN) BaseAddress);
if ((FtwLiteDevice->WorkSpaceAddress >= BaseAddress) &&
(FtwLiteDevice->WorkSpaceAddress <= (BaseAddress + FwVolHeader->FvLength))
) {
FtwLiteDevice->FtwFvBlock = Fvb;
//
// To get the LBA of work space
//
if ((FwVolHeader->FvLength) > (FwVolHeader->HeaderLength)) {
//
// FV may have multiple types of BlockLength
//
FvbMapEntry = &FwVolHeader->BlockMap[0];
while (!((FvbMapEntry->NumBlocks == 0) && (FvbMapEntry->Length == 0))) {
for (LbaIndex = 1; LbaIndex <= FvbMapEntry->NumBlocks; LbaIndex += 1) {
if (FtwLiteDevice->WorkSpaceAddress < (BaseAddress + FvbMapEntry->Length * LbaIndex)) {
FtwLiteDevice->FtwWorkSpaceLba = LbaIndex - 1;
//
// Get the Work space size and Base(Offset)
//
FtwLiteDevice->FtwWorkSpaceSize = FtwLiteDevice->WorkSpaceLength;
FtwLiteDevice->FtwWorkSpaceBase = (UINTN) (FtwLiteDevice->WorkSpaceAddress - (BaseAddress + FvbMapEntry->Length * (LbaIndex - 1)));
break;
}
}
//
// end for
//
FvbMapEntry++;
}
//
// end while
//
}
}
if ((FtwLiteDevice->SpareAreaAddress >= BaseAddress) &&
(FtwLiteDevice->SpareAreaAddress < (BaseAddress + FwVolHeader->FvLength))
) {
FtwLiteDevice->FtwBackupFvb = Fvb;
//
// To get the LBA of spare
//
if ((FwVolHeader->FvLength) > (FwVolHeader->HeaderLength)) {
//
// FV may have multiple types of BlockLength
//
FvbMapEntry = &FwVolHeader->BlockMap[0];
while (!((FvbMapEntry->NumBlocks == 0) && (FvbMapEntry->Length == 0))) {
for (LbaIndex = 1; LbaIndex <= FvbMapEntry->NumBlocks; LbaIndex += 1) {
if (FtwLiteDevice->SpareAreaAddress < (BaseAddress + FvbMapEntry->Length * LbaIndex)) {
//
// Get the NumberOfSpareBlock and SizeOfSpareBlock
//
FtwLiteDevice->FtwSpareLba = LbaIndex - 1;
FtwLiteDevice->SizeOfSpareBlock = FvbMapEntry->Length;
FtwLiteDevice->NumberOfSpareBlock = FtwLiteDevice->SpareAreaLength / FtwLiteDevice->SizeOfSpareBlock;
//
// Check the range of spare area to make sure that it's in FV range
//
ASSERT ((FtwLiteDevice->FtwSpareLba + FtwLiteDevice->NumberOfSpareBlock) <= FvbMapEntry->NumBlocks);
break;
}
}
FvbMapEntry++;
}
//
// end while
//
}
}
}
//
// Calculate the start LBA of working block. Working block is an area which
// contains working space in its last block and has the same size as spare
// block, unless there are not enough blocks before the block that contains
// working space.
//
FtwLiteDevice->FtwWorkBlockLba = FtwLiteDevice->FtwWorkSpaceLba - FtwLiteDevice->NumberOfSpareBlock + 1;
if ((INT64) (FtwLiteDevice->FtwWorkBlockLba) < 0) {
FtwLiteDevice->FtwWorkBlockLba = 0;
}
if ((FtwLiteDevice->FtwFvBlock == NULL) ||
(FtwLiteDevice->FtwBackupFvb == NULL) ||
(FtwLiteDevice->FtwWorkSpaceLba == (EFI_LBA) (-1)) ||
(FtwLiteDevice->FtwSpareLba == (EFI_LBA) (-1))
) {
DEBUG ((EFI_D_ERROR, "FtwLite: Working or spare FVB not ready\n"));
ASSERT_EFI_ERROR (Status);
}
//
// Refresh workspace data from working block
//
Status = WorkSpaceRefresh (FtwLiteDevice);
ASSERT_EFI_ERROR (Status);
//
// If the working block workspace is not valid, try the spare block
//
if (!IsValidWorkSpace (FtwLiteDevice->FtwWorkSpaceHeader)) {
DEBUG ((EFI_D_FTW_LITE, "FtwLite: Workspace invalid, read from backup\n"));
//
// Read from spare block
//
Length = FtwLiteDevice->FtwWorkSpaceSize;
Status = FtwLiteDevice->FtwBackupFvb->Read (
FtwLiteDevice->FtwBackupFvb,
FtwLiteDevice->FtwSpareLba,
FtwLiteDevice->FtwWorkSpaceBase,
&Length,
FtwLiteDevice->FtwWorkSpace
);
ASSERT_EFI_ERROR (Status);
//
// If spare block is valid, then replace working block content.
//
if (IsValidWorkSpace (FtwLiteDevice->FtwWorkSpaceHeader)) {
Status = FlushSpareBlockToWorkingBlock (FtwLiteDevice);
DEBUG ((EFI_D_FTW_LITE, "FtwLite: Restart working block in Init() - %r\n", Status));
ASSERT_EFI_ERROR (Status);
FtwAbort (FtwLiteDevice);
//
// Refresh work space.
//
Status = WorkSpaceRefresh (FtwLiteDevice);
if (EFI_ERROR (Status)) {
return EFI_ABORTED;
}
} else {
DEBUG ((EFI_D_FTW_LITE, "FtwLite: Both are invalid, init workspace\n"));
//
// If both are invalid, then initialize work space.
//
SetMem (
FtwLiteDevice->FtwWorkSpace,
FtwLiteDevice->FtwWorkSpaceSize,
FTW_ERASED_BYTE
);
InitWorkSpaceHeader (FtwLiteDevice->FtwWorkSpaceHeader);
//
// Write to work space on the working block
//
Length = FtwLiteDevice->FtwWorkSpaceSize;
Status = FtwLiteDevice->FtwFvBlock->Write (
FtwLiteDevice->FtwFvBlock,
FtwLiteDevice->FtwWorkSpaceLba,
FtwLiteDevice->FtwWorkSpaceBase,
&Length,
FtwLiteDevice->FtwWorkSpace
);
if (EFI_ERROR (Status)) {
return EFI_ABORTED;
}
}
}
//
// Hook the protocol API
//
FtwLiteDevice->FtwLiteInstance.Write = FtwLiteWrite;
//
// Install protocol interface
//
Status = gBS->InstallProtocolInterface (
&FtwLiteDevice->Handle,
&gEfiFaultTolerantWriteLiteProtocolGuid,
EFI_NATIVE_INTERFACE,
&FtwLiteDevice->FtwLiteInstance
);
if (EFI_ERROR (Status)) {
return EFI_ABORTED;
}
//
// If (!SpareCompleted) THEN Abort to rollback.
//
if ((FtwLiteDevice->FtwLastRecord->WriteAllocated == FTW_VALID_STATE) &&
(FtwLiteDevice->FtwLastRecord->SpareCompleted != FTW_VALID_STATE)
) {
DEBUG ((EFI_D_FTW_LITE, "FtwLite: Init.. record not SpareCompleted, abort()\n"));
FtwAbort (FtwLiteDevice);
}
//
// if (SpareCompleted) THEN Restart to fault tolerant write.
//
if ((FtwLiteDevice->FtwLastRecord->SpareCompleted == FTW_VALID_STATE) &&
(FtwLiteDevice->FtwLastRecord->WriteCompleted != FTW_VALID_STATE)
) {
Status = FtwRestart (FtwLiteDevice);
DEBUG ((EFI_D_FTW_LITE, "FtwLite: Restart last write - %r\n", Status));
if (EFI_ERROR (Status)) {
return Status;
}
}
//
// To check the workspace buffer behind last records is EMPTY or not.
// If it's not EMPTY, FTW_LITE also need to call reclaim().
//
Record = FtwLiteDevice->FtwLastRecord;
Offset = (UINT8 *) Record - FtwLiteDevice->FtwWorkSpace;
if (FtwLiteDevice->FtwWorkSpace[Offset] != FTW_ERASED_BYTE) {
Offset += WRITE_TOTAL_SIZE;
}
if (!IsErasedFlashBuffer (
FTW_ERASE_POLARITY,
FtwLiteDevice->FtwWorkSpace + Offset,
FtwLiteDevice->FtwWorkSpaceSize - Offset
)) {
DEBUG ((EFI_D_FTW_LITE, "FtwLite: Workspace is dirty, call reclaim...\n"));
Status = FtwReclaimWorkSpace (FtwLiteDevice);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_FTW_LITE, "FtwLite: Workspace reclaim - %r\n", Status));
return EFI_ABORTED;
}
}
return EFI_SUCCESS;
}
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