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audk/EdkModulePkg/Universal/FirmwareVolume/FaultTolerantWriteLite/Dxe/FtwMisc.c

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/*++
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:
FtwMisc.c
Abstract:
Internal functions to support fault tolerant write.
Revision History
--*/
#include <FtwLite.h>
BOOLEAN
IsErasedFlashBuffer (
IN BOOLEAN Polarity,
IN UINT8 *Buffer,
IN UINTN BufferSize
)
/*++
Routine Description:
Check whether a flash buffer is erased.
Arguments:
Polarity - All 1 or all 0
Buffer - Buffer to check
BufferSize - Size of the buffer
Returns:
Erased or not.
--*/
{
UINT8 ErasedValue;
UINT8 *Ptr;
if (Polarity) {
ErasedValue = 0xFF;
} else {
ErasedValue = 0;
}
Ptr = Buffer;
while (BufferSize--) {
if (*Ptr++ != ErasedValue) {
return FALSE;
}
}
return TRUE;
}
EFI_STATUS
FtwEraseBlock (
IN EFI_FTW_LITE_DEVICE *FtwLiteDevice,
EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *FvBlock,
EFI_LBA Lba
)
/*++
Routine Description:
To Erase one block. The size is FTW_BLOCK_SIZE
Arguments:
FtwLiteDevice - Calling context
FvBlock - FVB Protocol interface
Lba - Lba of the firmware block
Returns:
EFI_SUCCESS - Block LBA is Erased successfully
Others - Error occurs
--*/
{
return FvBlock->EraseBlocks (
FvBlock,
Lba,
FtwLiteDevice->NumberOfSpareBlock,
EFI_LBA_LIST_TERMINATOR
);
}
EFI_STATUS
FtwEraseSpareBlock (
IN EFI_FTW_LITE_DEVICE *FtwLiteDevice
)
/*++
Routine Description:
Erase spare block.
Arguments:
FtwLiteDevice - Calling context
Returns:
Status code
--*/
{
return FtwLiteDevice->FtwBackupFvb->EraseBlocks (
FtwLiteDevice->FtwBackupFvb,
FtwLiteDevice->FtwSpareLba,
FtwLiteDevice->NumberOfSpareBlock,
EFI_LBA_LIST_TERMINATOR
);
}
EFI_STATUS
FtwGetFvbByHandle (
IN EFI_HANDLE FvBlockHandle,
OUT EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL **FvBlock
)
/*++
Routine Description:
Retrive the proper FVB protocol interface by HANDLE.
Arguments:
FvBlockHandle - The handle of FVB protocol that provides services for
reading, writing, and erasing the target block.
FvBlock - The interface of FVB protocol
Returns:
EFI_SUCCESS - The function completed successfully
EFI_ABORTED - The function could not complete successfully
--*/
{
//
// To get the FVB protocol interface on the handle
//
return gBS->HandleProtocol (
FvBlockHandle,
&gEfiFirmwareVolumeBlockProtocolGuid,
(VOID **) FvBlock
);
}
EFI_STATUS
GetFvbByAddress (
IN EFI_PHYSICAL_ADDRESS Address,
OUT EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL **FvBlock
)
/*++
Routine Description:
Get firmware block by address.
Arguments:
Address - Address specified the block
FvBlock - The block caller wanted
Returns:
Status code
EFI_NOT_FOUND - Block not found
--*/
{
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;
*FvBlock = NULL;
//
// Locate all handles of Fvb protocol
//
Status = gBS->LocateHandleBuffer (
ByProtocol,
&gEfiFirmwareVolumeBlockProtocolGuid,
NULL,
&HandleCount,
&HandleBuffer
);
if (EFI_ERROR (Status)) {
return EFI_NOT_FOUND;
}
//
// Search all FVB until find the right one
//
for (Index = 0; Index < HandleCount; Index += 1) {
Status = gBS->HandleProtocol (
HandleBuffer[Index],
&gEfiFirmwareVolumeBlockProtocolGuid,
(VOID **) &Fvb
);
if (EFI_ERROR (Status)) {
Status = EFI_NOT_FOUND;
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;
Status = EFI_SUCCESS;
break;
}
}
gBS->FreePool (HandleBuffer);
return Status;
}
BOOLEAN
IsInWorkingBlock (
EFI_FTW_LITE_DEVICE *FtwLiteDevice,
EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *FvBlock,
EFI_LBA Lba
)
/*++
Routine Description:
Is it in working block?
Arguments:
FtwLiteDevice - Calling context
FvBlock - Fvb protocol instance
Lba - The block specified
Returns:
In working block or not
--*/
{
//
// 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 == FtwLiteDevice->FtwFvBlock) &&
(Lba >= FtwLiteDevice->FtwWorkBlockLba) &&
(Lba <= FtwLiteDevice->FtwWorkSpaceLba)
);
}
EFI_STATUS
FlushSpareBlockToTargetBlock (
EFI_FTW_LITE_DEVICE *FtwLiteDevice,
EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *FvBlock,
EFI_LBA Lba
)
/*++
Routine Description:
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
FtwLiteDevice->FtwSpareLba.
Target block is accessed by FvBlock protocol interface. LBA is Lba.
Arguments:
FtwLiteDevice - The private data of FTW_LITE driver
FvBlock - FVB Protocol interface to access target block
Lba - Lba of the target block
Returns:
EFI_SUCCESS - Spare block content is copied to target block
EFI_INVALID_PARAMETER - Input parameter error
EFI_OUT_OF_RESOURCES - Allocate memory error
EFI_ABORTED - The function could not complete successfully
--*/
{
EFI_STATUS Status;
UINTN Length;
UINT8 *Buffer;
UINTN Count;
UINT8 *Ptr;
UINTN Index;
if ((FtwLiteDevice == NULL) || (FvBlock == NULL)) {
return EFI_INVALID_PARAMETER;
}
//
// Allocate a memory buffer
//
Length = FtwLiteDevice->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 < FtwLiteDevice->NumberOfSpareBlock; Index += 1) {
Count = FtwLiteDevice->SizeOfSpareBlock;
Status = FtwLiteDevice->FtwBackupFvb->Read (
FtwLiteDevice->FtwBackupFvb,
FtwLiteDevice->FtwSpareLba + Index,
0,
&Count,
Ptr
);
if (EFI_ERROR (Status)) {
gBS->FreePool (Buffer);
return Status;
}
Ptr += Count;
}
//
// Erase the target block
//
Status = FtwEraseBlock (FtwLiteDevice, FvBlock, Lba);
if (EFI_ERROR (Status)) {
gBS->FreePool (Buffer);
return EFI_ABORTED;
}
//
// Write memory buffer to block, using the FvbBlock protocol interface
//
Ptr = Buffer;
for (Index = 0; Index < FtwLiteDevice->NumberOfSpareBlock; Index += 1) {
Count = FtwLiteDevice->SizeOfSpareBlock;
Status = FvBlock->Write (FvBlock, Lba + Index, 0, &Count, Ptr);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_FTW_LITE, "FtwLite: FVB Write block - %r\n", Status));
gBS->FreePool (Buffer);
return Status;
}
Ptr += Count;
}
gBS->FreePool (Buffer);
return Status;
}
EFI_STATUS
FlushSpareBlockToWorkingBlock (
EFI_FTW_LITE_DEVICE *FtwLiteDevice
)
/*++
Routine Description:
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
FtwLiteDevice->FtwSpareLba.
Working block is accessed by FTW working FVB protocol interface. LBA is
FtwLiteDevice->FtwWorkBlockLba.
Arguments:
FtwLiteDevice - The private data of FTW_LITE driver
Returns:
EFI_SUCCESS - Spare block content is copied to target block
EFI_OUT_OF_RESOURCES - Allocate memory error
EFI_ABORTED - The function could not complete successfully
Notes:
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.
--*/
{
EFI_STATUS Status;
UINTN Length;
UINT8 *Buffer;
EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER *WorkingBlockHeader;
EFI_LBA WorkSpaceLbaOffset;
UINTN Count;
UINT8 *Ptr;
UINTN Index;
//
// Allocate a memory buffer
//
Length = FtwLiteDevice->SpareAreaLength;
Buffer = AllocatePool (Length);
if (Buffer == NULL) {
return EFI_OUT_OF_RESOURCES;
}
//
// To guarantee that the WorkingBlockValid is set on spare block
//
WorkSpaceLbaOffset = FtwLiteDevice->FtwWorkSpaceLba - FtwLiteDevice->FtwWorkBlockLba;
FtwUpdateFvState (
FtwLiteDevice->FtwBackupFvb,
FtwLiteDevice->FtwSpareLba + WorkSpaceLbaOffset,
FtwLiteDevice->FtwWorkSpaceBase + sizeof (EFI_GUID) + sizeof (UINT32),
WORKING_BLOCK_VALID
);
//
// Read from spare block to memory buffer
//
Ptr = Buffer;
for (Index = 0; Index < FtwLiteDevice->NumberOfSpareBlock; Index += 1) {
Count = FtwLiteDevice->SizeOfSpareBlock;
Status = FtwLiteDevice->FtwBackupFvb->Read (
FtwLiteDevice->FtwBackupFvb,
FtwLiteDevice->FtwSpareLba + Index,
0,
&Count,
Ptr
);
if (EFI_ERROR (Status)) {
gBS->FreePool (Buffer);
return Status;
}
Ptr += Count;
}
//
// Clear the CRC and STATE, copy data from spare to working block.
//
WorkingBlockHeader = (EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER *) (Buffer + (UINTN) WorkSpaceLbaOffset * FtwLiteDevice->SizeOfSpareBlock + FtwLiteDevice->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 = EFI_FIELD_OFFSET(EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER,
// WorkingBlockInvalid);
// To skip Signature and Crc: sizeof(EFI_GUID)+sizeof(UINT32).
//
Status = FtwUpdateFvState (
FtwLiteDevice->FtwFvBlock,
FtwLiteDevice->FtwWorkSpaceLba,
FtwLiteDevice->FtwWorkSpaceBase + sizeof (EFI_GUID) + sizeof (UINT32),
WORKING_BLOCK_INVALID
);
if (EFI_ERROR (Status)) {
gBS->FreePool (Buffer);
return EFI_ABORTED;
}
FtwLiteDevice->FtwWorkSpaceHeader->WorkingBlockInvalid = FTW_VALID_STATE;
//
// Erase the working block
//
Status = FtwEraseBlock (
FtwLiteDevice,
FtwLiteDevice->FtwFvBlock,
FtwLiteDevice->FtwWorkBlockLba
);
if (EFI_ERROR (Status)) {
gBS->FreePool (Buffer);
return EFI_ABORTED;
}
//
// Write memory buffer to working block, using the FvbBlock protocol interface
//
Ptr = Buffer;
for (Index = 0; Index < FtwLiteDevice->NumberOfSpareBlock; Index += 1) {
Count = FtwLiteDevice->SizeOfSpareBlock;
Status = FtwLiteDevice->FtwFvBlock->Write (
FtwLiteDevice->FtwFvBlock,
FtwLiteDevice->FtwWorkBlockLba + Index,
0,
&Count,
Ptr
);
if (EFI_ERROR (Status)) {
DEBUG ((EFI_D_FTW_LITE, "FtwLite: FVB Write block - %r\n", Status));
gBS->FreePool (Buffer);
return Status;
}
Ptr += Count;
}
//
// Since the memory buffer will not be used, free memory Buffer.
//
gBS->FreePool (Buffer);
//
// Update the VALID of the working block
//
// Offset = EFI_FIELD_OFFSET(EFI_FAULT_TOLERANT_WORKING_BLOCK_HEADER,
// WorkingBlockValid);
// Hardcode offset sizeof(EFI_GUID)+sizeof(UINT32), to skip Signature and Crc
//
Status = FtwUpdateFvState (
FtwLiteDevice->FtwFvBlock,
FtwLiteDevice->FtwWorkSpaceLba,
FtwLiteDevice->FtwWorkSpaceBase + sizeof (EFI_GUID) + sizeof (UINT32),
WORKING_BLOCK_VALID
);
if (EFI_ERROR (Status)) {
return EFI_ABORTED;
}
FtwLiteDevice->FtwWorkSpaceHeader->WorkingBlockValid = FTW_VALID_STATE;
return EFI_SUCCESS;
}
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