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/**@file
Defines data structure that is the volume header found.
These data is intent to decouple FVB driver with FV header.
Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
Copyright (c) Microsoft Corporation.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "SpiFvbServiceCommon.h"
#define FIRMWARE_BLOCK_SIZE SIZE_64KB
#define FVB_MEDIA_BLOCK_SIZE FIRMWARE_BLOCK_SIZE
typedef struct {
EFI_PHYSICAL_ADDRESS BaseAddress;
EFI_FIRMWARE_VOLUME_HEADER FvbInfo;
EFI_FV_BLOCK_MAP_ENTRY End[1];
} EFI_FVB2_MEDIA_INFO;
/**
Returns FVB media information for a firmware volume.
@return FvbMediaInfo A pointer to an instance of FVB media info produced by this function.
The buffer is allocated internally to this function and it is the caller's
responsibility to free the memory
**/
typedef
EFI_STATUS
(*FVB_MEDIA_INFO_GENERATOR)(
OUT EFI_FVB2_MEDIA_INFO *FvbMediaInfo
);
/**
Returns FVB media information for NV variable storage.
@param[out] FvbMediaInfo A pointer to an instance of FVB media info produced by this function.
@retval EFI_SUCCESS A structure was successfully written to the FvbMediaInfo buffer.
@retval EFI_INVALID_PARAMETER The FvbMediaInfo parameter is NULL.
@retval EFI_UNSUPPORTED An error occurred retrieving variable FV information.
@retval EFI_BAD_BUFFER_SIZE An overflow or underflow of the FV buffer occurred with the information found.
**/
EFI_STATUS
GenerateNvStorageFvbMediaInfo (
OUT EFI_FVB2_MEDIA_INFO *FvbMediaInfo
)
{
EFI_STATUS Status;
UINT32 NvBlockNum;
UINT32 TotalNvVariableStorageSize;
EFI_PHYSICAL_ADDRESS NvStorageBaseAddress;
EFI_FIRMWARE_VOLUME_HEADER FvbInfo = {
{0,}, //ZeroVector[16]
EFI_SYSTEM_NV_DATA_FV_GUID, //FileSystemGuid
0, //FvLength
EFI_FVH_SIGNATURE, //Signature
0x0004feff, //Attributes
sizeof (EFI_FIRMWARE_VOLUME_HEADER) + //HeaderLength
sizeof (EFI_FV_BLOCK_MAP_ENTRY),
0, //Checksum
0, //ExtHeaderOffset
{0,}, //Reserved[1]
2, //Revision
{ //BlockMap[1]
{0,0}
}
};
if (FvbMediaInfo == NULL) {
return EFI_INVALID_PARAMETER;
}
ZeroMem (FvbMediaInfo, sizeof (*FvbMediaInfo));
GetVariableFvInfo (&NvStorageBaseAddress, &TotalNvVariableStorageSize);
if ((NvStorageBaseAddress == 0) || (TotalNvVariableStorageSize == 0)) {
return EFI_UNSUPPORTED;
}
NvBlockNum = TotalNvVariableStorageSize / FVB_MEDIA_BLOCK_SIZE;
Status = SafeUint64Mult ((UINT64)NvBlockNum, FVB_MEDIA_BLOCK_SIZE, &FvbInfo.FvLength);
if (EFI_ERROR (Status)) {
return EFI_BAD_BUFFER_SIZE;
}
FvbInfo.BlockMap[0].NumBlocks = NvBlockNum;
FvbInfo.BlockMap[0].Length = FVB_MEDIA_BLOCK_SIZE;
FvbMediaInfo->BaseAddress = NvStorageBaseAddress;
CopyMem (&FvbMediaInfo->FvbInfo, &FvbInfo, sizeof (FvbInfo));
return EFI_SUCCESS;
}
FVB_MEDIA_INFO_GENERATOR mFvbMediaInfoGenerators[] = {
GenerateNvStorageFvbMediaInfo
};
/**
Returns an empty firmware volume for the firmware volume at the given base address.
@param[in] FvBaseAddress The base address of the firmware volume requested.
@param[out] FvbInfo A pointer that will be set to a buffer for the firmware volume header
at the given base address. The buffer is a pool allocation made in this function.
@retval EFI_SUCCESS The firmware volume was returned successfully.
@retval EFI_INVALID_PARAMETER The FvbInfo pointer argument is NULL.
@retval EFI_NOT_FOUND The firmware volume was not found for the given base address.
@retval EFI_OUT_OF_RESOURCES Insufficient memory to allocate a buffer to the hold the firmware volume.
**/
EFI_STATUS
GetGeneratedFvByAddress (
IN EFI_PHYSICAL_ADDRESS FvBaseAddress,
OUT EFI_FIRMWARE_VOLUME_HEADER **FvbInfo
)
{
EFI_STATUS Status;
EFI_FVB2_MEDIA_INFO FvbMediaInfo;
UINTN Index;
EFI_FIRMWARE_VOLUME_HEADER *FvHeader;
if (FvbInfo == NULL) {
return EFI_INVALID_PARAMETER;
}
for (Index = 0; Index < ARRAY_SIZE (mFvbMediaInfoGenerators); Index++) {
Status = mFvbMediaInfoGenerators[Index](&FvbMediaInfo);
ASSERT_EFI_ERROR (Status);
if (!EFI_ERROR (Status) && (FvbMediaInfo.BaseAddress == FvBaseAddress)) {
FvHeader = AllocateCopyPool (FvbMediaInfo.FvbInfo.HeaderLength, &FvbMediaInfo.FvbInfo);
if (FvHeader == NULL) {
ASSERT (FvHeader != NULL);
return EFI_OUT_OF_RESOURCES;
}
//
// Update the checksum value of FV header.
//
FvHeader->Checksum = CalculateCheckSum16 ( (UINT16 *) FvHeader, FvHeader->HeaderLength);
*FvbInfo = FvHeader;
DEBUG ((DEBUG_INFO, "BaseAddr: 0x%lx \n", FvBaseAddress));
DEBUG ((DEBUG_INFO, "FvLength: 0x%lx \n", (*FvbInfo)->FvLength));
DEBUG ((DEBUG_INFO, "HeaderLength: 0x%x \n", (*FvbInfo)->HeaderLength));
DEBUG ((DEBUG_INFO, "Header Checksum: 0x%X\n", (*FvbInfo)->Checksum));
DEBUG ((DEBUG_INFO, "FvBlockMap[0].NumBlocks: 0x%x \n", (*FvbInfo)->BlockMap[0].NumBlocks));
DEBUG ((DEBUG_INFO, "FvBlockMap[0].BlockLength: 0x%x \n", (*FvbInfo)->BlockMap[0].Length));
DEBUG ((DEBUG_INFO, "FvBlockMap[1].NumBlocks: 0x%x \n", (*FvbInfo)->BlockMap[1].NumBlocks));
DEBUG ((DEBUG_INFO, "FvBlockMap[1].BlockLength: 0x%x \n\n", (*FvbInfo)->BlockMap[1].Length));
return EFI_SUCCESS;
}
}
return EFI_NOT_FOUND;
}
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