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/** @file
Copyright (c) 2014 - 2021, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <PiDxe.h>
#include <Protocol/FirmwareVolumeBlock.h>
#include <Library/PcdLib.h>
#include <Library/DebugLib.h>
#include <Library/BaseLib.h>
#include <Guid/FirmwareFileSystem2.h>
#include <Guid/SystemNvDataGuid.h>
#define FVB_MEDIA_BLOCK_SIZE 0x1000
typedef struct {
EFI_FIRMWARE_VOLUME_HEADER FvInfo;
EFI_FV_BLOCK_MAP_ENTRY End[1];
} EFI_FVB2_MEDIA_INFO;
//
// This data structure contains a template of FV header which is used to restore
// Fv header if it's corrupted.
//
EFI_FVB2_MEDIA_INFO mFvbMediaInfo = {
{
{ 0, }, // ZeroVector[16]
EFI_SYSTEM_NV_DATA_FV_GUID,
0,
EFI_FVH_SIGNATURE,
0x0004feff, // check PiFirmwareVolume.h for details on EFI_FVB_ATTRIBUTES_2
sizeof (EFI_FIRMWARE_VOLUME_HEADER) + sizeof (EFI_FV_BLOCK_MAP_ENTRY),
0, // CheckSum which will be calucated dynamically.
0, // ExtHeaderOffset
{ 0, },
EFI_FVH_REVISION,
{
{
0,
FVB_MEDIA_BLOCK_SIZE,
}
}
},
{
{
0,
0
}
}
};
/**
Get a heathy FV header used for variable store recovery
@retval The FV header.
**/
EFI_FIRMWARE_VOLUME_HEADER *
GetFvHeaderTemplate (
VOID
)
{
EFI_FIRMWARE_VOLUME_HEADER *FvHeader;
UINTN FvSize;
FvSize = PcdGet32 (PcdFlashNvStorageFtwSpareSize) * 2;
FvHeader = &mFvbMediaInfo.FvInfo;
FvHeader->FvLength = FvSize;
FvHeader->BlockMap[0].NumBlocks = (UINT32)(FvSize / FvHeader->BlockMap[0].Length);
FvHeader->Checksum = 0;
FvHeader->Checksum = CalculateCheckSum16 ((UINT16 *)FvHeader, FvHeader->HeaderLength);
return FvHeader;
}
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