/** @file | |
Internal functions to operate Working Block Space. | |
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 "FaultTolerantWrite.h" | |
/** | |
Check to see if it is a valid work space. | |
@param WorkingHeader Pointer of working block header | |
@retval EFI_SUCCESS The function completed successfully | |
@retval EFI_ABORTED The function could not complete successfully. | |
**/ | |
BOOLEAN | |
IsValidWorkSpace ( | |
IN EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER *WorkingHeader | |
) | |
{ | |
EFI_STATUS Status; | |
EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER WorkingBlockHeader; | |
if (WorkingHeader == NULL) { | |
return FALSE; | |
} | |
if (WorkingHeader->WorkingBlockValid != FTW_VALID_STATE) { | |
DEBUG ((EFI_D_ERROR, "Ftw: Work block header valid bit check error\n")); | |
return FALSE; | |
} | |
// | |
// Check signature with gEfiSystemNvDataFvGuid | |
// | |
if (!CompareGuid (&gEfiSystemNvDataFvGuid, &WorkingHeader->Signature)) { | |
DEBUG ((EFI_D_ERROR, "Ftw: Work block header signature check error\n")); | |
return FALSE; | |
} | |
// | |
// Check the CRC of header | |
// | |
CopyMem ( | |
&WorkingBlockHeader, | |
WorkingHeader, | |
sizeof (EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER) | |
); | |
// | |
// Filter out the Crc and State fields | |
// | |
SetMem ( | |
&WorkingBlockHeader.Crc, | |
sizeof (UINT32), | |
FTW_ERASED_BYTE | |
); | |
WorkingBlockHeader.WorkingBlockValid = FTW_ERASE_POLARITY; | |
WorkingBlockHeader.WorkingBlockInvalid = FTW_ERASE_POLARITY; | |
// | |
// Calculate the Crc of woking block header | |
// | |
Status = gBS->CalculateCrc32 ( | |
(UINT8 *) &WorkingBlockHeader, | |
sizeof (EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER), | |
&WorkingBlockHeader.Crc | |
); | |
if (EFI_ERROR (Status)) { | |
return FALSE; | |
} | |
if (WorkingBlockHeader.Crc != WorkingHeader->Crc) { | |
DEBUG ((EFI_D_ERROR, "Ftw: Work block header CRC check error\n")); | |
return FALSE; | |
} | |
return TRUE; | |
} | |
/** | |
Initialize a work space when there is no work space. | |
@param WorkingHeader Pointer of working block header | |
@retval EFI_SUCCESS The function completed successfully | |
@retval EFI_ABORTED The function could not complete successfully. | |
**/ | |
EFI_STATUS | |
InitWorkSpaceHeader ( | |
IN EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER *WorkingHeader | |
) | |
{ | |
EFI_STATUS Status; | |
if (WorkingHeader == NULL) { | |
return EFI_INVALID_PARAMETER; | |
} | |
// | |
// Here using gEfiSystemNvDataFvGuid as the signature. | |
// | |
CopyMem ( | |
&WorkingHeader->Signature, | |
&gEfiSystemNvDataFvGuid, | |
sizeof (EFI_GUID) | |
); | |
WorkingHeader->WriteQueueSize = (UINT64) (PcdGet32 (PcdFlashNvStorageFtwWorkingSize) - sizeof (EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER)); | |
// | |
// Crc is calculated with all the fields except Crc and STATE | |
// | |
WorkingHeader->WorkingBlockValid = FTW_ERASE_POLARITY; | |
WorkingHeader->WorkingBlockInvalid = FTW_ERASE_POLARITY; | |
SetMem ( | |
&WorkingHeader->Crc, | |
sizeof (UINT32), | |
FTW_ERASED_BYTE | |
); | |
// | |
// Calculate the CRC value | |
// | |
Status = gBS->CalculateCrc32 ( | |
(UINT8 *) WorkingHeader, | |
sizeof (EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER), | |
&WorkingHeader->Crc | |
); | |
if (EFI_ERROR (Status)) { | |
return EFI_ABORTED; | |
} | |
// | |
// Restore the WorkingBlockValid flag to VALID state | |
// | |
WorkingHeader->WorkingBlockValid = FTW_VALID_STATE; | |
WorkingHeader->WorkingBlockInvalid = FTW_INVALID_STATE; | |
return EFI_SUCCESS; | |
} | |
/** | |
Read from working block to refresh the work space in memory. | |
@param FtwDevice Point to private data of FTW driver | |
@retval EFI_SUCCESS The function completed successfully | |
@retval EFI_ABORTED The function could not complete successfully. | |
**/ | |
EFI_STATUS | |
WorkSpaceRefresh ( | |
IN EFI_FTW_DEVICE *FtwDevice | |
) | |
{ | |
EFI_STATUS Status; | |
UINTN Length; | |
UINTN Offset; | |
EFI_FAULT_TOLERANT_WRITE_HEADER *FtwHeader; | |
// | |
// Initialize WorkSpace as FTW_ERASED_BYTE | |
// | |
SetMem ( | |
FtwDevice->FtwWorkSpace, | |
FtwDevice->FtwWorkSpaceSize, | |
FTW_ERASED_BYTE | |
); | |
// | |
// Read from working block | |
// | |
Length = FtwDevice->FtwWorkSpaceSize; | |
Status = FtwDevice->FtwFvBlock->Read ( | |
FtwDevice->FtwFvBlock, | |
FtwDevice->FtwWorkSpaceLba, | |
FtwDevice->FtwWorkSpaceBase, | |
&Length, | |
FtwDevice->FtwWorkSpace | |
); | |
if (EFI_ERROR (Status)) { | |
return EFI_ABORTED; | |
} | |
// | |
// Refresh the FtwLastWriteHeader | |
// | |
Status = FtwGetLastWriteHeader ( | |
FtwDevice->FtwWorkSpaceHeader, | |
FtwDevice->FtwWorkSpaceSize, | |
&FtwDevice->FtwLastWriteHeader | |
); | |
FtwHeader = FtwDevice->FtwLastWriteHeader; | |
Offset = (UINTN) (UINT8 *) FtwHeader - (UINTN) FtwDevice->FtwWorkSpace; | |
// | |
// if the Header is out of the workspace limit, call reclaim. | |
// | |
if (EFI_ERROR (Status) && (Offset >= FtwDevice->FtwWorkSpaceSize)) { | |
// | |
// reclaim work space in working block. | |
// | |
Status = FtwReclaimWorkSpace (FtwDevice, TRUE); | |
if (EFI_ERROR (Status)) { | |
DEBUG ((EFI_D_ERROR, "Ftw: Reclaim workspace - %r\n", Status)); | |
return EFI_ABORTED; | |
} | |
// | |
// Read from working block again | |
// | |
Length = FtwDevice->FtwWorkSpaceSize; | |
Status = FtwDevice->FtwFvBlock->Read ( | |
FtwDevice->FtwFvBlock, | |
FtwDevice->FtwWorkSpaceLba, | |
FtwDevice->FtwWorkSpaceBase, | |
&Length, | |
FtwDevice->FtwWorkSpace | |
); | |
if (EFI_ERROR (Status)) { | |
return EFI_ABORTED; | |
} | |
Status = FtwGetLastWriteHeader ( | |
FtwDevice->FtwWorkSpaceHeader, | |
FtwDevice->FtwWorkSpaceSize, | |
&FtwDevice->FtwLastWriteHeader | |
); | |
} | |
// | |
// Refresh the FtwLastWriteRecord | |
// | |
Status = FtwGetLastWriteRecord ( | |
FtwDevice->FtwLastWriteHeader, | |
&FtwDevice->FtwLastWriteRecord | |
); | |
if (EFI_ERROR (Status)) { | |
return EFI_ABORTED; | |
} | |
return EFI_SUCCESS; | |
} | |
/** | |
Reclaim the work space on the working block. | |
@param FtwDevice Point to private data of FTW driver | |
@param PreserveRecord Whether to preserve the working record is needed | |
@retval EFI_SUCCESS The function completed successfully | |
@retval EFI_OUT_OF_RESOURCES Allocate memory error | |
@retval EFI_ABORTED The function could not complete successfully | |
**/ | |
EFI_STATUS | |
FtwReclaimWorkSpace ( | |
IN EFI_FTW_DEVICE *FtwDevice, | |
IN BOOLEAN PreserveRecord | |
) | |
{ | |
EFI_STATUS Status; | |
UINTN Length; | |
EFI_FAULT_TOLERANT_WRITE_HEADER *Header; | |
UINT8 *TempBuffer; | |
UINTN TempBufferSize; | |
UINTN SpareBufferSize; | |
UINT8 *SpareBuffer; | |
EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER *WorkingBlockHeader; | |
UINTN Index; | |
UINT8 *Ptr; | |
DEBUG ((EFI_D_ERROR, "Ftw: start to reclaim work space\n")); | |
// | |
// Read all original data from working block to a memory buffer | |
// | |
TempBufferSize = FtwDevice->SpareAreaLength; | |
TempBuffer = AllocateZeroPool (TempBufferSize); | |
if (TempBuffer == NULL) { | |
return EFI_OUT_OF_RESOURCES; | |
} | |
Ptr = TempBuffer; | |
for (Index = 0; Index < FtwDevice->NumberOfSpareBlock; Index += 1) { | |
Length = FtwDevice->BlockSize; | |
Status = FtwDevice->FtwFvBlock->Read ( | |
FtwDevice->FtwFvBlock, | |
FtwDevice->FtwWorkBlockLba + Index, | |
0, | |
&Length, | |
Ptr | |
); | |
if (EFI_ERROR (Status)) { | |
FreePool (TempBuffer); | |
return EFI_ABORTED; | |
} | |
Ptr += Length; | |
} | |
// | |
// Clean up the workspace, remove all the completed records. | |
// | |
Ptr = TempBuffer + | |
((UINTN) (FtwDevice->FtwWorkSpaceLba - FtwDevice->FtwWorkBlockLba)) * FtwDevice->BlockSize + | |
FtwDevice->FtwWorkSpaceBase; | |
// | |
// Clear the content of buffer that will save the new work space data | |
// | |
SetMem (Ptr, FtwDevice->FtwWorkSpaceSize, FTW_ERASED_BYTE); | |
// | |
// Copy EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER to buffer | |
// | |
CopyMem ( | |
Ptr, | |
FtwDevice->FtwWorkSpaceHeader, | |
sizeof (EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER) | |
); | |
if (PreserveRecord) { | |
// | |
// Get the last record following the header, | |
// | |
Status = FtwGetLastWriteHeader ( | |
FtwDevice->FtwWorkSpaceHeader, | |
FtwDevice->FtwWorkSpaceSize, | |
&FtwDevice->FtwLastWriteHeader | |
); | |
Header = FtwDevice->FtwLastWriteHeader; | |
if (!EFI_ERROR (Status) && (Header != NULL) && (Header->Complete != FTW_VALID_STATE)) { | |
CopyMem ( | |
Ptr + sizeof (EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER), | |
FtwDevice->FtwLastWriteHeader, | |
WRITE_TOTAL_SIZE (Header->NumberOfWrites, Header->PrivateDataSize) | |
); | |
} | |
} | |
CopyMem ( | |
FtwDevice->FtwWorkSpace, | |
Ptr, | |
FtwDevice->FtwWorkSpaceSize | |
); | |
FtwGetLastWriteHeader ( | |
FtwDevice->FtwWorkSpaceHeader, | |
FtwDevice->FtwWorkSpaceSize, | |
&FtwDevice->FtwLastWriteHeader | |
); | |
// | |
// Set the WorkingBlockValid and WorkingBlockInvalid as INVALID | |
// | |
WorkingBlockHeader = (EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER *) (TempBuffer + FtwDevice->FtwWorkSpaceBase); | |
WorkingBlockHeader->WorkingBlockValid = FTW_INVALID_STATE; | |
WorkingBlockHeader->WorkingBlockInvalid = FTW_INVALID_STATE; | |
// | |
// Try to keep the content of spare block | |
// Save spare block into a spare backup memory buffer (Sparebuffer) | |
// | |
SpareBufferSize = FtwDevice->SpareAreaLength; | |
SpareBuffer = AllocatePool (SpareBufferSize); | |
if (SpareBuffer == NULL) { | |
FreePool (TempBuffer); | |
return EFI_OUT_OF_RESOURCES; | |
} | |
Ptr = SpareBuffer; | |
for (Index = 0; Index < FtwDevice->NumberOfSpareBlock; Index += 1) { | |
Length = FtwDevice->BlockSize; | |
Status = FtwDevice->FtwBackupFvb->Read ( | |
FtwDevice->FtwBackupFvb, | |
FtwDevice->FtwSpareLba + Index, | |
0, | |
&Length, | |
Ptr | |
); | |
if (EFI_ERROR (Status)) { | |
FreePool (TempBuffer); | |
FreePool (SpareBuffer); | |
return EFI_ABORTED; | |
} | |
Ptr += Length; | |
} | |
// | |
// Write the memory buffer to spare block | |
// | |
Status = FtwEraseSpareBlock (FtwDevice); | |
Ptr = TempBuffer; | |
for (Index = 0; Index < FtwDevice->NumberOfSpareBlock; Index += 1) { | |
Length = FtwDevice->BlockSize; | |
Status = FtwDevice->FtwBackupFvb->Write ( | |
FtwDevice->FtwBackupFvb, | |
FtwDevice->FtwSpareLba + Index, | |
0, | |
&Length, | |
Ptr | |
); | |
if (EFI_ERROR (Status)) { | |
FreePool (TempBuffer); | |
FreePool (SpareBuffer); | |
return EFI_ABORTED; | |
} | |
Ptr += Length; | |
} | |
// | |
// Free TempBuffer | |
// | |
FreePool (TempBuffer); | |
// | |
// Set the WorkingBlockValid in spare block | |
// | |
Status = FtwUpdateFvState ( | |
FtwDevice->FtwBackupFvb, | |
FtwDevice->FtwWorkSpaceLba, | |
FtwDevice->FtwWorkSpaceBase + sizeof (EFI_GUID) + sizeof (UINT32), | |
WORKING_BLOCK_VALID | |
); | |
if (EFI_ERROR (Status)) { | |
FreePool (SpareBuffer); | |
return EFI_ABORTED; | |
} | |
// | |
// Before erase the working block, set WorkingBlockInvalid in working block. | |
// | |
// Offset = OFFSET_OF(EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER, | |
// WorkingBlockInvalid); | |
// | |
Status = FtwUpdateFvState ( | |
FtwDevice->FtwFvBlock, | |
FtwDevice->FtwWorkSpaceLba, | |
FtwDevice->FtwWorkSpaceBase + sizeof (EFI_GUID) + sizeof (UINT32), | |
WORKING_BLOCK_INVALID | |
); | |
if (EFI_ERROR (Status)) { | |
FreePool (SpareBuffer); | |
return EFI_ABORTED; | |
} | |
FtwDevice->FtwWorkSpaceHeader->WorkingBlockInvalid = FTW_VALID_STATE; | |
// | |
// Write the spare block to working block | |
// | |
Status = FlushSpareBlockToWorkingBlock (FtwDevice); | |
if (EFI_ERROR (Status)) { | |
FreePool (SpareBuffer); | |
return Status; | |
} | |
// | |
// Restore spare backup buffer into spare block , if no failure happened during FtwWrite. | |
// | |
Status = FtwEraseSpareBlock (FtwDevice); | |
Ptr = SpareBuffer; | |
for (Index = 0; Index < FtwDevice->NumberOfSpareBlock; Index += 1) { | |
Length = FtwDevice->BlockSize; | |
Status = FtwDevice->FtwBackupFvb->Write ( | |
FtwDevice->FtwBackupFvb, | |
FtwDevice->FtwSpareLba + Index, | |
0, | |
&Length, | |
Ptr | |
); | |
if (EFI_ERROR (Status)) { | |
FreePool (SpareBuffer); | |
return EFI_ABORTED; | |
} | |
Ptr += Length; | |
} | |
FreePool (SpareBuffer); | |
DEBUG ((EFI_D_ERROR, "Ftw: reclaim work space successfully\n")); | |
return EFI_SUCCESS; | |
} |