diff options
Diffstat (limited to 'MdeModulePkg/Universal/FaultTolerantWriteDxe/FtwMisc.c')
| -rw-r--r-- | MdeModulePkg/Universal/FaultTolerantWriteDxe/FtwMisc.c | 971 |
1 files changed, 971 insertions, 0 deletions
diff --git a/MdeModulePkg/Universal/FaultTolerantWriteDxe/FtwMisc.c b/MdeModulePkg/Universal/FaultTolerantWriteDxe/FtwMisc.c new file mode 100644 index 0000000000..de768e12ea --- /dev/null +++ b/MdeModulePkg/Universal/FaultTolerantWriteDxe/FtwMisc.c @@ -0,0 +1,971 @@ +/** @file
+
+ Internal generic functions to operate flash block.
+
+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 whether a flash buffer is erased.
+
+ @param Buffer Buffer to check
+ @param BufferSize Size of the buffer
+
+ @return A BOOLEAN value indicating erased or not.
+
+**/
+BOOLEAN
+IsErasedFlashBuffer (
+ IN UINT8 *Buffer,
+ IN UINTN BufferSize
+ )
+{
+ BOOLEAN IsEmpty;
+ UINT8 *Ptr;
+ UINTN Index;
+
+ Ptr = Buffer;
+ IsEmpty = TRUE;
+ for (Index = 0; Index < BufferSize; Index += 1) {
+ if (*Ptr++ != FTW_ERASED_BYTE) {
+ IsEmpty = FALSE;
+ break;
+ }
+ }
+
+ return IsEmpty;
+}
+
+/**
+ To erase the block with the spare block size.
+
+
+ @param FtwDevice The private data of FTW driver
+ @param FvBlock FVB Protocol interface
+ @param Lba Lba of the firmware block
+
+ @retval EFI_SUCCESS Block LBA is Erased successfully
+ @retval Others Error occurs
+
+**/
+EFI_STATUS
+FtwEraseBlock (
+ IN EFI_FTW_DEVICE *FtwDevice,
+ EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *FvBlock,
+ EFI_LBA Lba
+ )
+{
+ return FvBlock->EraseBlocks (
+ FvBlock,
+ Lba,
+ FtwDevice->NumberOfSpareBlock,
+ EFI_LBA_LIST_TERMINATOR
+ );
+}
+
+/**
+ Erase spare block.
+
+ @param FtwDevice The private data of FTW driver
+
+ @retval EFI_SUCCESS The erase request was successfully completed.
+ @retval EFI_ACCESS_DENIED The firmware volume is in the WriteDisabled state.
+ @retval EFI_DEVICE_ERROR The block device is not functioning
+ correctly and could not be written.
+ The firmware device may have been
+ partially erased.
+ @retval EFI_INVALID_PARAMETER One or more of the LBAs listed
+ in the variable argument list do
+ not exist in the firmware volume.
+
+
+**/
+EFI_STATUS
+FtwEraseSpareBlock (
+ IN EFI_FTW_DEVICE *FtwDevice
+ )
+{
+ return FtwDevice->FtwBackupFvb->EraseBlocks (
+ FtwDevice->FtwBackupFvb,
+ FtwDevice->FtwSpareLba,
+ FtwDevice->NumberOfSpareBlock,
+ EFI_LBA_LIST_TERMINATOR
+ );
+}
+
+/**
+ Retrive the proper FVB protocol interface by HANDLE.
+
+
+ @param FvBlockHandle The handle of FVB protocol that provides services for
+ reading, writing, and erasing the target block.
+ @param FvBlock The interface of FVB protocol
+
+ @retval EFI_SUCCESS The function completed successfully
+ @retval EFI_ABORTED The function could not complete successfully
+
+**/
+EFI_STATUS
+FtwGetFvbByHandle (
+ IN EFI_HANDLE FvBlockHandle,
+ OUT EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL **FvBlock
+ )
+{
+ //
+ // To get the FVB protocol interface on the handle
+ //
+ return gBS->HandleProtocol (
+ FvBlockHandle,
+ &gEfiFirmwareVolumeBlockProtocolGuid,
+ (VOID **) FvBlock
+ );
+}
+
+/**
+
+ Is it in working block?
+
+ @param FtwDevice The private data of FTW driver
+ @param FvBlock Fvb protocol instance
+ @param Lba The block specified
+
+ @return A BOOLEAN value indicating in working block or not.
+
+**/
+BOOLEAN
+IsWorkingBlock (
+ EFI_FTW_DEVICE *FtwDevice,
+ EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *FvBlock,
+ EFI_LBA Lba
+ )
+{
+ //
+ // If matching the following condition, the target block is in working block.
+ // 1. Target block is on the FV of working block (Using the same FVB protocol instance).
+ // 2. Lba falls into the range of working block.
+ //
+ return (BOOLEAN)
+ (
+ (FvBlock == FtwDevice->FtwFvBlock) &&
+ (Lba >= FtwDevice->FtwWorkBlockLba) &&
+ (Lba <= FtwDevice->FtwWorkSpaceLba)
+ );
+}
+
+/**
+
+ Get firmware block by address.
+
+
+ @param Address Address specified the block
+ @param FvBlock The block caller wanted
+
+ @retval EFI_SUCCESS The protocol instance if found.
+ @retval EFI_NOT_FOUND Block not found
+
+**/
+EFI_HANDLE
+GetFvbByAddress (
+ IN EFI_PHYSICAL_ADDRESS Address,
+ OUT EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL **FvBlock
+ )
+{
+ EFI_STATUS Status;
+ EFI_HANDLE *HandleBuffer;
+ UINTN HandleCount;
+ UINTN Index;
+ EFI_PHYSICAL_ADDRESS FvbBaseAddress;
+ EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *Fvb;
+ EFI_FIRMWARE_VOLUME_HEADER *FwVolHeader;
+ EFI_HANDLE FvbHandle;
+
+ *FvBlock = NULL;
+ FvbHandle = NULL;
+ //
+ // Locate all handles of Fvb protocol
+ //
+ Status = gBS->LocateHandleBuffer (
+ ByProtocol,
+ &gEfiFirmwareVolumeBlockProtocolGuid,
+ NULL,
+ &HandleCount,
+ &HandleBuffer
+ );
+ if (EFI_ERROR (Status)) {
+ return NULL;
+ }
+ //
+ // Get the FVB to access variable store
+ //
+ for (Index = 0; Index < HandleCount; Index += 1) {
+ Status = gBS->HandleProtocol (
+ HandleBuffer[Index],
+ &gEfiFirmwareVolumeBlockProtocolGuid,
+ (VOID **) &Fvb
+ );
+ if (EFI_ERROR (Status)) {
+ break;
+ }
+ //
+ // Compare the address and select the right one
+ //
+ Status = Fvb->GetPhysicalAddress (Fvb, &FvbBaseAddress);
+ if (EFI_ERROR (Status)) {
+ continue;
+ }
+
+ FwVolHeader = (EFI_FIRMWARE_VOLUME_HEADER *) ((UINTN) FvbBaseAddress);
+ if ((Address >= FvbBaseAddress) && (Address <= (FvbBaseAddress + (FwVolHeader->FvLength - 1)))) {
+ *FvBlock = Fvb;
+ FvbHandle = HandleBuffer[Index];
+ break;
+ }
+ }
+
+ FreePool (HandleBuffer);
+ return FvbHandle;
+}
+
+/**
+
+ Is it in boot block?
+
+ @param FtwDevice The private data of FTW driver
+ @param FvBlock Fvb protocol instance
+ @param Lba The block specified
+
+ @return A BOOLEAN value indicating in boot block or not.
+
+**/
+BOOLEAN
+IsBootBlock (
+ EFI_FTW_DEVICE *FtwDevice,
+ EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *FvBlock,
+ EFI_LBA Lba
+ )
+{
+ EFI_STATUS Status;
+ EFI_SWAP_ADDRESS_RANGE_PROTOCOL *SarProtocol;
+ EFI_PHYSICAL_ADDRESS BootBlockBase;
+ UINTN BootBlockSize;
+ EFI_PHYSICAL_ADDRESS BackupBlockBase;
+ UINTN BackupBlockSize;
+ EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *BootFvb;
+ BOOLEAN IsSwapped;
+ EFI_HANDLE FvbHandle;
+
+ if (!FeaturePcdGet(PcdFullFtwServiceEnable)) {
+ return FALSE;
+ }
+
+ Status = gBS->LocateProtocol (&gEfiSwapAddressRangeProtocolGuid, NULL, (VOID **) &SarProtocol);
+ if (EFI_ERROR (Status)) {
+ return FALSE;
+ }
+ //
+ // Get the boot block range
+ //
+ Status = SarProtocol->GetRangeLocation (
+ SarProtocol,
+ &BootBlockBase,
+ &BootBlockSize,
+ &BackupBlockBase,
+ &BackupBlockSize
+ );
+ if (EFI_ERROR (Status)) {
+ return FALSE;
+ }
+
+ Status = SarProtocol->GetSwapState (SarProtocol, &IsSwapped);
+ if (EFI_ERROR (Status)) {
+ return FALSE;
+ }
+ //
+ // Get FVB by address
+ //
+ if (!IsSwapped) {
+ FvbHandle = GetFvbByAddress (BootBlockBase, &BootFvb);
+ } else {
+ FvbHandle = GetFvbByAddress (BackupBlockBase, &BootFvb);
+ }
+
+ if (FvbHandle == NULL) {
+ return FALSE;
+ }
+ //
+ // Compare the Fvb
+ //
+ return (BOOLEAN) (FvBlock == BootFvb);
+}
+
+/**
+ Copy the content of spare block to a boot block. Size is FTW_BLOCK_SIZE.
+ Spare block is accessed by FTW working FVB protocol interface. LBA is 1.
+ Target block is accessed by FvbBlock protocol interface. LBA is Lba.
+
+ FTW will do extra work on boot block update.
+ FTW should depend on a protocol of EFI_ADDRESS_RANGE_SWAP_PROTOCOL,
+ which is produced by a chipset driver.
+ FTW updating boot block steps may be:
+ 1. GetRangeLocation(), if the Range is inside the boot block, FTW know
+ that boot block will be update. It shall add a FLAG in the working block.
+ 2. When spare block is ready,
+ 3. SetSwapState(EFI_SWAPPED)
+ 4. erasing boot block,
+ 5. programming boot block until the boot block is ok.
+ 6. SetSwapState(UNSWAPPED)
+ FTW shall not allow to update boot block when battery state is error.
+
+ @param FtwDevice The private data of FTW driver
+
+ @retval EFI_SUCCESS Spare block content is copied to boot block
+ @retval EFI_INVALID_PARAMETER Input parameter error
+ @retval EFI_OUT_OF_RESOURCES Allocate memory error
+ @retval EFI_ABORTED The function could not complete successfully
+
+**/
+EFI_STATUS
+FlushSpareBlockToBootBlock (
+ EFI_FTW_DEVICE *FtwDevice
+ )
+{
+ EFI_STATUS Status;
+ UINTN Length;
+ UINT8 *Buffer;
+ UINTN Count;
+ UINT8 *Ptr;
+ UINTN Index;
+ BOOLEAN TopSwap;
+ EFI_SWAP_ADDRESS_RANGE_PROTOCOL *SarProtocol;
+ EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *BootFvb;
+ EFI_LBA BootLba;
+
+ if (!FeaturePcdGet(PcdFullFtwServiceEnable)) {
+ return EFI_UNSUPPORTED;
+ }
+
+ //
+ // Locate swap address range protocol
+ //
+ Status = gBS->LocateProtocol (&gEfiSwapAddressRangeProtocolGuid, NULL, (VOID **) &SarProtocol);
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+ //
+ // Allocate a memory buffer
+ //
+ Length = FtwDevice->SpareAreaLength;
+ Buffer = AllocatePool (Length);
+ if (Buffer == NULL) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+ //
+ // Get TopSwap bit state
+ //
+ Status = SarProtocol->GetSwapState (SarProtocol, &TopSwap);
+ if (EFI_ERROR (Status)) {
+ DEBUG ((EFI_D_ERROR, "Ftw: Get Top Swapped status - %r\n", Status));
+ FreePool (Buffer);
+ return EFI_ABORTED;
+ }
+
+ if (TopSwap) {
+ //
+ // Get FVB of current boot block
+ //
+ if (GetFvbByAddress (FtwDevice->SpareAreaAddress + FtwDevice->SpareAreaLength, &BootFvb) == NULL) {
+ FreePool (Buffer);
+ return EFI_ABORTED;
+ }
+ //
+ // Read data from current boot block
+ //
+ BootLba = 0;
+ Ptr = Buffer;
+ for (Index = 0; Index < FtwDevice->NumberOfSpareBlock; Index += 1) {
+ Count = FtwDevice->BlockSize;
+ Status = BootFvb->Read (
+ BootFvb,
+ BootLba + Index,
+ 0,
+ &Count,
+ Ptr
+ );
+ if (EFI_ERROR (Status)) {
+ FreePool (Buffer);
+ return Status;
+ }
+
+ Ptr += Count;
+ }
+ } else {
+ //
+ // Read data from spare block
+ //
+ Ptr = Buffer;
+ for (Index = 0; Index < FtwDevice->NumberOfSpareBlock; Index += 1) {
+ Count = FtwDevice->BlockSize;
+ Status = FtwDevice->FtwBackupFvb->Read (
+ FtwDevice->FtwBackupFvb,
+ FtwDevice->FtwSpareLba + Index,
+ 0,
+ &Count,
+ Ptr
+ );
+ if (EFI_ERROR (Status)) {
+ FreePool (Buffer);
+ return Status;
+ }
+
+ Ptr += Count;
+ }
+ //
+ // Set TopSwap bit
+ //
+ Status = SarProtocol->SetSwapState (SarProtocol, TRUE);
+ if (EFI_ERROR (Status)) {
+ FreePool (Buffer);
+ return Status;
+ }
+ }
+ //
+ // Erase current spare block
+ // Because TopSwap is set, this actually erase the top block (boot block)!
+ //
+ Status = FtwEraseSpareBlock (FtwDevice);
+ if (EFI_ERROR (Status)) {
+ FreePool (Buffer);
+ return EFI_ABORTED;
+ }
+ //
+ // Write memory buffer currenet spare block. Still top block.
+ //
+ Ptr = Buffer;
+ for (Index = 0; Index < FtwDevice->NumberOfSpareBlock; Index += 1) {
+ Count = FtwDevice->BlockSize;
+ Status = FtwDevice->FtwBackupFvb->Write (
+ FtwDevice->FtwBackupFvb,
+ FtwDevice->FtwSpareLba + Index,
+ 0,
+ &Count,
+ Ptr
+ );
+ if (EFI_ERROR (Status)) {
+ DEBUG ((EFI_D_ERROR, "Ftw: FVB Write boot block - %r\n", Status));
+ FreePool (Buffer);
+ return Status;
+ }
+
+ Ptr += Count;
+ }
+
+ FreePool (Buffer);
+
+ //
+ // Clear TopSwap bit
+ //
+ Status = SarProtocol->SetSwapState (SarProtocol, FALSE);
+
+ return Status;
+}
+
+/**
+ Copy the content of spare block to a target block. Size is FTW_BLOCK_SIZE.
+ Spare block is accessed by FTW backup FVB protocol interface. LBA is 1.
+ Target block is accessed by FvbBlock protocol interface. LBA is Lba.
+
+
+ @param FtwDevice The private data of FTW driver
+ @param FvBlock FVB Protocol interface to access target block
+ @param Lba Lba of the target block
+
+ @retval EFI_SUCCESS Spare block content is copied to target block
+ @retval EFI_INVALID_PARAMETER Input parameter error
+ @retval EFI_OUT_OF_RESOURCES Allocate memory error
+ @retval EFI_ABORTED The function could not complete successfully
+
+**/
+EFI_STATUS
+FlushSpareBlockToTargetBlock (
+ EFI_FTW_DEVICE *FtwDevice,
+ EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *FvBlock,
+ EFI_LBA Lba
+ )
+{
+ EFI_STATUS Status;
+ UINTN Length;
+ UINT8 *Buffer;
+ UINTN Count;
+ UINT8 *Ptr;
+ UINTN Index;
+
+ if ((FtwDevice == NULL) || (FvBlock == NULL)) {
+ return EFI_INVALID_PARAMETER;
+ }
+ //
+ // Allocate a memory buffer
+ //
+ Length = FtwDevice->SpareAreaLength;
+ Buffer = AllocatePool (Length);
+ if (Buffer == NULL) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+ //
+ // Read all content of spare block to memory buffer
+ //
+ Ptr = Buffer;
+ for (Index = 0; Index < FtwDevice->NumberOfSpareBlock; Index += 1) {
+ Count = FtwDevice->BlockSize;
+ Status = FtwDevice->FtwBackupFvb->Read (
+ FtwDevice->FtwBackupFvb,
+ FtwDevice->FtwSpareLba + Index,
+ 0,
+ &Count,
+ Ptr
+ );
+ if (EFI_ERROR (Status)) {
+ FreePool (Buffer);
+ return Status;
+ }
+
+ Ptr += Count;
+ }
+ //
+ // Erase the target block
+ //
+ Status = FtwEraseBlock (FtwDevice, FvBlock, Lba);
+ if (EFI_ERROR (Status)) {
+ FreePool (Buffer);
+ return EFI_ABORTED;
+ }
+ //
+ // Write memory buffer to block, using the FvbBlock protocol interface
+ //
+ Ptr = Buffer;
+ for (Index = 0; Index < FtwDevice->NumberOfSpareBlock; Index += 1) {
+ Count = FtwDevice->BlockSize;
+ Status = FvBlock->Write (FvBlock, Lba + Index, 0, &Count, Ptr);
+ if (EFI_ERROR (Status)) {
+ DEBUG ((EFI_D_ERROR, "Ftw: FVB Write block - %r\n", Status));
+ FreePool (Buffer);
+ return Status;
+ }
+
+ Ptr += Count;
+ }
+
+ FreePool (Buffer);
+
+ return Status;
+}
+
+/**
+ Copy the content of spare block to working block. Size is FTW_BLOCK_SIZE.
+ Spare block is accessed by FTW backup FVB protocol interface. LBA is
+ FtwDevice->FtwSpareLba.
+ Working block is accessed by FTW working FVB protocol interface. LBA is
+ FtwDevice->FtwWorkBlockLba.
+
+ Since the working block header is important when FTW initializes, the
+ state of the operation should be handled carefully. The Crc value is
+ calculated without STATE element.
+
+ @param FtwDevice The private data of FTW driver
+
+ @retval EFI_SUCCESS Spare block content is copied to target block
+ @retval EFI_OUT_OF_RESOURCES Allocate memory error
+ @retval EFI_ABORTED The function could not complete successfully
+
+**/
+EFI_STATUS
+FlushSpareBlockToWorkingBlock (
+ EFI_FTW_DEVICE *FtwDevice
+ )
+{
+ EFI_STATUS Status;
+ UINTN Length;
+ UINT8 *Buffer;
+ EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER *WorkingBlockHeader;
+ UINTN Count;
+ UINT8 *Ptr;
+ UINTN Index;
+ EFI_LBA WorkSpaceLbaOffset;
+
+ //
+ // Allocate a memory buffer
+ //
+ Length = FtwDevice->SpareAreaLength;
+ Buffer = AllocatePool (Length);
+ if (Buffer == NULL) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+ //
+ // To guarantee that the WorkingBlockValid is set on spare block
+ //
+ // Offset = OFFSET_OF(EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER,
+ // WorkingBlockValid);
+ // To skip Signature and Crc: sizeof(EFI_GUID)+sizeof(UINT32).
+ //
+ FtwUpdateFvState (
+ FtwDevice->FtwBackupFvb,
+ FtwDevice->FtwWorkSpaceLba,
+ FtwDevice->FtwWorkSpaceBase + sizeof (EFI_GUID) + sizeof (UINT32),
+ WORKING_BLOCK_VALID
+ );
+ //
+ // Read from spare block to memory buffer
+ //
+ Ptr = Buffer;
+ for (Index = 0; Index < FtwDevice->NumberOfSpareBlock; Index += 1) {
+ Count = FtwDevice->BlockSize;
+ Status = FtwDevice->FtwBackupFvb->Read (
+ FtwDevice->FtwBackupFvb,
+ FtwDevice->FtwSpareLba + Index,
+ 0,
+ &Count,
+ Ptr
+ );
+ if (EFI_ERROR (Status)) {
+ FreePool (Buffer);
+ return Status;
+ }
+
+ Ptr += Count;
+ }
+ //
+ // Clear the CRC and STATE, copy data from spare to working block.
+ //
+ WorkSpaceLbaOffset = FtwDevice->FtwWorkSpaceLba - FtwDevice->FtwWorkBlockLba;
+ WorkingBlockHeader = (EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER *) (Buffer + (UINTN) WorkSpaceLbaOffset * FtwDevice->BlockSize + FtwDevice->FtwWorkSpaceBase);
+ InitWorkSpaceHeader (WorkingBlockHeader);
+ WorkingBlockHeader->WorkingBlockValid = FTW_ERASE_POLARITY;
+ WorkingBlockHeader->WorkingBlockInvalid = FTW_ERASE_POLARITY;
+
+ //
+ // target block is working block, then
+ // Set WorkingBlockInvalid in EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER
+ // before erase the working block.
+ //
+ // Offset = OFFSET_OF(EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER,
+ // WorkingBlockInvalid);
+ // So hardcode offset as sizeof(EFI_GUID)+sizeof(UINT32) to
+ // skip Signature and Crc.
+ //
+ Status = FtwUpdateFvState (
+ FtwDevice->FtwFvBlock,
+ FtwDevice->FtwWorkSpaceLba,
+ FtwDevice->FtwWorkSpaceBase + sizeof (EFI_GUID) + sizeof (UINT32),
+ WORKING_BLOCK_INVALID
+ );
+ if (EFI_ERROR (Status)) {
+ FreePool (Buffer);
+ return EFI_ABORTED;
+ }
+
+ FtwDevice->FtwWorkSpaceHeader->WorkingBlockInvalid = FTW_VALID_STATE;
+
+ //
+ // Erase the working block
+ //
+ Status = FtwEraseBlock (FtwDevice, FtwDevice->FtwFvBlock, FtwDevice->FtwWorkBlockLba);
+ if (EFI_ERROR (Status)) {
+ FreePool (Buffer);
+ return EFI_ABORTED;
+ }
+ //
+ // Write memory buffer to working block, using the FvbBlock protocol interface
+ //
+ Ptr = Buffer;
+ for (Index = 0; Index < FtwDevice->NumberOfSpareBlock; Index += 1) {
+ Count = FtwDevice->BlockSize;
+ Status = FtwDevice->FtwFvBlock->Write (
+ FtwDevice->FtwFvBlock,
+ FtwDevice->FtwWorkBlockLba + Index,
+ 0,
+ &Count,
+ Ptr
+ );
+ if (EFI_ERROR (Status)) {
+ DEBUG ((EFI_D_ERROR, "Ftw: FVB Write block - %r\n", Status));
+ FreePool (Buffer);
+ return Status;
+ }
+
+ Ptr += Count;
+ }
+ //
+ // Since the memory buffer will not be used, free memory Buffer.
+ //
+ FreePool (Buffer);
+
+ //
+ // Update the VALID of the working block
+ //
+ // Offset = OFFSET_OF(EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER, WorkingBlockValid);
+ // So hardcode offset as sizeof(EFI_GUID)+sizeof(UINT32) to skip Signature and Crc.
+ //
+ Status = FtwUpdateFvState (
+ FtwDevice->FtwFvBlock,
+ FtwDevice->FtwWorkSpaceLba,
+ FtwDevice->FtwWorkSpaceBase + sizeof (EFI_GUID) + sizeof (UINT32),
+ WORKING_BLOCK_VALID
+ );
+ if (EFI_ERROR (Status)) {
+ return EFI_ABORTED;
+ }
+
+ FtwDevice->FtwWorkSpaceHeader->WorkingBlockValid = FTW_VALID_STATE;
+
+ return EFI_SUCCESS;
+}
+
+/**
+ Update a bit of state on a block device. The location of the bit is
+ calculated by the (Lba, Offset, bit). Here bit is determined by the
+ the name of a certain bit.
+
+
+ @param FvBlock FVB Protocol interface to access SrcBlock and DestBlock
+ @param Lba Lba of a block
+ @param Offset Offset on the Lba
+ @param NewBit New value that will override the old value if it can be change
+
+ @retval EFI_SUCCESS A state bit has been updated successfully
+ @retval Others Access block device error.
+ Notes:
+ Assume all bits of State are inside the same BYTE.
+ @retval EFI_ABORTED Read block fail
+
+**/
+EFI_STATUS
+FtwUpdateFvState (
+ IN EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *FvBlock,
+ IN EFI_LBA Lba,
+ IN UINTN Offset,
+ IN UINT8 NewBit
+ )
+{
+ EFI_STATUS Status;
+ UINT8 State;
+ UINTN Length;
+
+ //
+ // Read state from device, assume State is only one byte.
+ //
+ Length = sizeof (UINT8);
+ Status = FvBlock->Read (FvBlock, Lba, Offset, &Length, &State);
+ if (EFI_ERROR (Status)) {
+ return EFI_ABORTED;
+ }
+
+ State ^= FTW_POLARITY_REVERT;
+ State = (UINT8) (State | NewBit);
+ State ^= FTW_POLARITY_REVERT;
+
+ //
+ // Write state back to device
+ //
+ Length = sizeof (UINT8);
+ Status = FvBlock->Write (FvBlock, Lba, Offset, &Length, &State);
+
+ return Status;
+}
+
+/**
+ Get the last Write Header pointer.
+ The last write header is the header whose 'complete' state hasn't been set.
+ After all, this header may be a EMPTY header entry for next Allocate.
+
+
+ @param FtwWorkSpaceHeader Pointer of the working block header
+ @param FtwWorkSpaceSize Size of the work space
+ @param FtwWriteHeader Pointer to retrieve the last write header
+
+ @retval EFI_SUCCESS Get the last write record successfully
+ @retval EFI_ABORTED The FTW work space is damaged
+
+**/
+EFI_STATUS
+FtwGetLastWriteHeader (
+ IN EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER *FtwWorkSpaceHeader,
+ IN UINTN FtwWorkSpaceSize,
+ OUT EFI_FAULT_TOLERANT_WRITE_HEADER **FtwWriteHeader
+ )
+{
+ UINTN Offset;
+ EFI_FAULT_TOLERANT_WRITE_HEADER *FtwHeader;
+
+ *FtwWriteHeader = NULL;
+ FtwHeader = (EFI_FAULT_TOLERANT_WRITE_HEADER *) (FtwWorkSpaceHeader + 1);
+ Offset = sizeof (EFI_FAULT_TOLERANT_WRITE_HEADER);
+
+ while (FtwHeader->Complete == FTW_VALID_STATE) {
+ Offset += WRITE_TOTAL_SIZE (FtwHeader->NumberOfWrites, FtwHeader->PrivateDataSize);
+ //
+ // If Offset exceed the FTW work space boudary, return error.
+ //
+ if (Offset > FtwWorkSpaceSize) {
+ *FtwWriteHeader = FtwHeader;
+ return EFI_ABORTED;
+ }
+
+ FtwHeader = (EFI_FAULT_TOLERANT_WRITE_HEADER *) ((UINT8 *) FtwWorkSpaceHeader + Offset);
+ }
+ //
+ // Last write header is found
+ //
+ *FtwWriteHeader = FtwHeader;
+
+ return EFI_SUCCESS;
+}
+
+/**
+ Get the last Write Record pointer. The last write Record is the Record
+ whose DestinationCompleted state hasn't been set. After all, this Record
+ may be a EMPTY record entry for next write.
+
+
+ @param FtwWriteHeader Pointer to the write record header
+ @param FtwWriteRecord Pointer to retrieve the last write record
+
+ @retval EFI_SUCCESS Get the last write record successfully
+ @retval EFI_ABORTED The FTW work space is damaged
+
+**/
+EFI_STATUS
+FtwGetLastWriteRecord (
+ IN EFI_FAULT_TOLERANT_WRITE_HEADER *FtwWriteHeader,
+ OUT EFI_FAULT_TOLERANT_WRITE_RECORD **FtwWriteRecord
+ )
+{
+ UINTN Index;
+ EFI_FAULT_TOLERANT_WRITE_RECORD *FtwRecord;
+
+ *FtwWriteRecord = NULL;
+ FtwRecord = (EFI_FAULT_TOLERANT_WRITE_RECORD *) (FtwWriteHeader + 1);
+
+ //
+ // Try to find the last write record "that has not completed"
+ //
+ for (Index = 0; Index < FtwWriteHeader->NumberOfWrites; Index += 1) {
+ if (FtwRecord->DestinationComplete != FTW_VALID_STATE) {
+ //
+ // The last write record is found
+ //
+ *FtwWriteRecord = FtwRecord;
+ return EFI_SUCCESS;
+ }
+
+ FtwRecord++;
+
+ if (FtwWriteHeader->PrivateDataSize != 0) {
+ FtwRecord = (EFI_FAULT_TOLERANT_WRITE_RECORD *) ((UINTN) FtwRecord + FtwWriteHeader->PrivateDataSize);
+ }
+ }
+ //
+ // if Index == NumberOfWrites, then
+ // the last record has been written successfully,
+ // but the Header->Complete Flag has not been set.
+ // also return the last record.
+ //
+ if (Index == FtwWriteHeader->NumberOfWrites) {
+ *FtwWriteRecord = (EFI_FAULT_TOLERANT_WRITE_RECORD *) ((UINTN) FtwRecord - RECORD_SIZE (FtwWriteHeader->PrivateDataSize));
+ return EFI_SUCCESS;
+ }
+
+ return EFI_ABORTED;
+}
+
+/**
+ To check if FtwRecord is the first record of FtwHeader.
+
+ @param FtwHeader Pointer to the write record header
+ @param FtwRecord Pointer to the write record
+
+ @retval TRUE FtwRecord is the first Record of the FtwHeader
+ @retval FALSE FtwRecord is not the first Record of the FtwHeader
+
+**/
+BOOLEAN
+IsFirstRecordOfWrites (
+ IN EFI_FAULT_TOLERANT_WRITE_HEADER *FtwHeader,
+ IN EFI_FAULT_TOLERANT_WRITE_RECORD *FtwRecord
+ )
+{
+ UINT8 *Head;
+ UINT8 *Ptr;
+
+ Head = (UINT8 *) FtwHeader;
+ Ptr = (UINT8 *) FtwRecord;
+
+ Head += sizeof (EFI_FAULT_TOLERANT_WRITE_HEADER);
+ return (BOOLEAN) (Head == Ptr);
+}
+
+/**
+ To check if FtwRecord is the last record of FtwHeader. Because the
+ FtwHeader has NumberOfWrites & PrivateDataSize, the FtwRecord can be
+ determined if it is the last record of FtwHeader.
+
+ @param FtwHeader Pointer to the write record header
+ @param FtwRecord Pointer to the write record
+
+ @retval TRUE FtwRecord is the last Record of the FtwHeader
+ @retval FALSE FtwRecord is not the last Record of the FtwHeader
+
+**/
+BOOLEAN
+IsLastRecordOfWrites (
+ IN EFI_FAULT_TOLERANT_WRITE_HEADER *FtwHeader,
+ IN EFI_FAULT_TOLERANT_WRITE_RECORD *FtwRecord
+ )
+{
+ UINT8 *Head;
+ UINT8 *Ptr;
+
+ Head = (UINT8 *) FtwHeader;
+ Ptr = (UINT8 *) FtwRecord;
+
+ Head += WRITE_TOTAL_SIZE (FtwHeader->NumberOfWrites - 1, FtwHeader->PrivateDataSize);
+ return (BOOLEAN) (Head == Ptr);
+}
+
+/**
+ To check if FtwRecord is the first record of FtwHeader.
+
+ @param FtwHeader Pointer to the write record header
+ @param FtwRecord Pointer to retrieve the previous write record
+
+ @retval EFI_ACCESS_DENIED Input record is the first record, no previous record is return.
+ @retval EFI_SUCCESS The previous write record is found.
+
+**/
+EFI_STATUS
+GetPreviousRecordOfWrites (
+ IN EFI_FAULT_TOLERANT_WRITE_HEADER *FtwHeader,
+ IN OUT EFI_FAULT_TOLERANT_WRITE_RECORD **FtwRecord
+ )
+{
+ UINT8 *Ptr;
+
+ if (IsFirstRecordOfWrites (FtwHeader, *FtwRecord)) {
+ *FtwRecord = NULL;
+ return EFI_ACCESS_DENIED;
+ }
+
+ Ptr = (UINT8 *) (*FtwRecord);
+ Ptr -= RECORD_SIZE (FtwHeader->PrivateDataSize);
+ *FtwRecord = (EFI_FAULT_TOLERANT_WRITE_RECORD *) Ptr;
+ return EFI_SUCCESS;
+}
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