/*++ @file | |
A simple FV stack so the SEC can extract the SEC Core from an | |
FV. | |
Copyright (c) 2006, Intel Corporation. All rights reserved.<BR> | |
SPDX-License-Identifier: BSD-2-Clause-Patent | |
**/ | |
#include <PiPei.h> | |
#define GET_OCCUPIED_SIZE(ActualSize, Alignment) \ | |
(ActualSize) + (((Alignment) - ((ActualSize) & ((Alignment) - 1))) & ((Alignment) - 1)) | |
EFI_FFS_FILE_STATE | |
GetFileState ( | |
IN UINT8 ErasePolarity, | |
IN EFI_FFS_FILE_HEADER *FfsHeader | |
) | |
/*++ | |
Routine Description: | |
Returns the highest bit set of the State field | |
Arguments: | |
ErasePolarity - Erase Polarity as defined by EFI_FVB2_ERASE_POLARITY | |
in the Attributes field. | |
FfsHeader - Pointer to FFS File Header. | |
Returns: | |
Returns the highest bit in the State field | |
**/ | |
{ | |
EFI_FFS_FILE_STATE FileState; | |
EFI_FFS_FILE_STATE HighestBit; | |
FileState = FfsHeader->State; | |
if (ErasePolarity != 0) { | |
FileState = (EFI_FFS_FILE_STATE) ~FileState; | |
} | |
HighestBit = 0x80; | |
while (HighestBit != 0 && (HighestBit & FileState) == 0) { | |
HighestBit >>= 1; | |
} | |
return HighestBit; | |
} | |
UINT8 | |
CalculateHeaderChecksum ( | |
IN EFI_FFS_FILE_HEADER *FileHeader | |
) | |
/*++ | |
Routine Description: | |
Calculates the checksum of the header of a file. | |
Arguments: | |
FileHeader - Pointer to FFS File Header. | |
Returns: | |
Checksum of the header. | |
**/ | |
{ | |
UINT8 *ptr; | |
UINTN Index; | |
UINT8 Sum; | |
Sum = 0; | |
ptr = (UINT8 *)FileHeader; | |
for (Index = 0; Index < sizeof (EFI_FFS_FILE_HEADER) - 3; Index += 4) { | |
Sum = (UINT8)(Sum + ptr[Index]); | |
Sum = (UINT8)(Sum + ptr[Index + 1]); | |
Sum = (UINT8)(Sum + ptr[Index + 2]); | |
Sum = (UINT8)(Sum + ptr[Index + 3]); | |
} | |
for ( ; Index < sizeof (EFI_FFS_FILE_HEADER); Index++) { | |
Sum = (UINT8)(Sum + ptr[Index]); | |
} | |
// | |
// State field (since this indicates the different state of file). | |
// | |
Sum = (UINT8)(Sum - FileHeader->State); | |
// | |
// Checksum field of the file is not part of the header checksum. | |
// | |
Sum = (UINT8)(Sum - FileHeader->IntegrityCheck.Checksum.File); | |
return Sum; | |
} | |
EFI_STATUS | |
SecFfsFindNextFile ( | |
IN EFI_FV_FILETYPE SearchType, | |
IN EFI_PEI_FV_HANDLE FvHandle, | |
IN OUT EFI_PEI_FILE_HANDLE *FileHandle | |
) | |
/*++ | |
Routine Description: | |
Given the input file pointer, search for the next matching file in the | |
FFS volume as defined by SearchType. The search starts from FileHeader inside | |
the Firmware Volume defined by FwVolHeader. | |
Arguments: | |
SearchType - Filter to find only files of this type. | |
Type EFI_FV_FILETYPE_ALL causes no filtering to be done. | |
FwVolHeader - Pointer to the FV header of the volume to search. | |
This parameter must point to a valid FFS volume. | |
FileHeader - Pointer to the current file from which to begin searching. | |
This pointer will be updated upon return to reflect the file | |
found. | |
Returns: | |
EFI_NOT_FOUND - No files matching the search criteria were found | |
EFI_SUCCESS | |
**/ | |
{ | |
EFI_FFS_FILE_HEADER *FfsFileHeader; | |
UINT32 FileLength; | |
UINT32 FileOccupiedSize; | |
UINT32 FileOffset; | |
UINT64 FvLength; | |
UINT8 ErasePolarity; | |
UINT8 FileState; | |
EFI_FIRMWARE_VOLUME_HEADER *FwVolHeader; | |
EFI_FFS_FILE_HEADER **FileHeader; | |
// | |
// Convert the handle of FV to FV header for memory-mapped firmware volume | |
// | |
FwVolHeader = (EFI_FIRMWARE_VOLUME_HEADER *)FvHandle; | |
FileHeader = (EFI_FFS_FILE_HEADER **)FileHandle; | |
FvLength = FwVolHeader->FvLength; | |
if (FwVolHeader->Attributes & EFI_FVB2_ERASE_POLARITY) { | |
ErasePolarity = 1; | |
} else { | |
ErasePolarity = 0; | |
} | |
// | |
// If FileHeader is not specified (NULL) start with the first file in the | |
// firmware volume. Otherwise, start from the FileHeader. | |
// | |
if (*FileHeader == NULL) { | |
FfsFileHeader = (EFI_FFS_FILE_HEADER *)((UINT8 *)FwVolHeader + FwVolHeader->HeaderLength); | |
} else { | |
// | |
// Length is 24 bits wide so mask upper 8 bits | |
// FileLength is adjusted to FileOccupiedSize as it is 8 byte aligned. | |
// | |
FileLength = *(UINT32 *)(*FileHeader)->Size & 0x00FFFFFF; | |
FileOccupiedSize = GET_OCCUPIED_SIZE (FileLength, 8); | |
FfsFileHeader = (EFI_FFS_FILE_HEADER *)((UINT8 *)*FileHeader + FileOccupiedSize); | |
} | |
FileOffset = (UINT32)((UINT8 *)FfsFileHeader - (UINT8 *)FwVolHeader); | |
while (FileOffset < (FvLength - sizeof (EFI_FFS_FILE_HEADER))) { | |
// | |
// Get FileState which is the highest bit of the State | |
// | |
FileState = GetFileState (ErasePolarity, FfsFileHeader); | |
switch (FileState) { | |
case EFI_FILE_HEADER_INVALID: | |
FileOffset += sizeof (EFI_FFS_FILE_HEADER); | |
FfsFileHeader = (EFI_FFS_FILE_HEADER *)((UINT8 *)FfsFileHeader + sizeof (EFI_FFS_FILE_HEADER)); | |
break; | |
case EFI_FILE_DATA_VALID: | |
case EFI_FILE_MARKED_FOR_UPDATE: | |
if (CalculateHeaderChecksum (FfsFileHeader) == 0) { | |
FileLength = *(UINT32 *)(FfsFileHeader->Size) & 0x00FFFFFF; | |
FileOccupiedSize = GET_OCCUPIED_SIZE (FileLength, 8); | |
if ((SearchType == FfsFileHeader->Type) || (SearchType == EFI_FV_FILETYPE_ALL)) { | |
*FileHeader = FfsFileHeader; | |
return EFI_SUCCESS; | |
} | |
FileOffset += FileOccupiedSize; | |
FfsFileHeader = (EFI_FFS_FILE_HEADER *)((UINT8 *)FfsFileHeader + FileOccupiedSize); | |
} else { | |
return EFI_NOT_FOUND; | |
} | |
break; | |
case EFI_FILE_DELETED: | |
FileLength = *(UINT32 *)(FfsFileHeader->Size) & 0x00FFFFFF; | |
FileOccupiedSize = GET_OCCUPIED_SIZE (FileLength, 8); | |
FileOffset += FileOccupiedSize; | |
FfsFileHeader = (EFI_FFS_FILE_HEADER *)((UINT8 *)FfsFileHeader + FileOccupiedSize); | |
break; | |
default: | |
return EFI_NOT_FOUND; | |
} | |
} | |
return EFI_NOT_FOUND; | |
} | |
EFI_STATUS | |
SecFfsFindSectionData ( | |
IN EFI_SECTION_TYPE SectionType, | |
IN EFI_FFS_FILE_HEADER *FfsFileHeader, | |
IN OUT VOID **SectionData | |
) | |
/*++ | |
Routine Description: | |
Given the input file pointer, search for the next matching section in the | |
FFS volume. | |
Arguments: | |
SearchType - Filter to find only sections of this type. | |
FfsFileHeader - Pointer to the current file to search. | |
SectionData - Pointer to the Section matching SectionType in FfsFileHeader. | |
NULL if section not found | |
Returns: | |
EFI_NOT_FOUND - No files matching the search criteria were found | |
EFI_SUCCESS | |
**/ | |
{ | |
UINT32 FileSize; | |
EFI_COMMON_SECTION_HEADER *Section; | |
UINT32 SectionLength; | |
UINT32 ParsedLength; | |
// | |
// Size is 24 bits wide so mask upper 8 bits. | |
// Does not include FfsFileHeader header size | |
// FileSize is adjusted to FileOccupiedSize as it is 8 byte aligned. | |
// | |
Section = (EFI_COMMON_SECTION_HEADER *)(FfsFileHeader + 1); | |
FileSize = *(UINT32 *)(FfsFileHeader->Size) & 0x00FFFFFF; | |
FileSize -= sizeof (EFI_FFS_FILE_HEADER); | |
*SectionData = NULL; | |
ParsedLength = 0; | |
while (ParsedLength < FileSize) { | |
if (Section->Type == SectionType) { | |
*SectionData = (VOID *)(Section + 1); | |
return EFI_SUCCESS; | |
} | |
// | |
// Size is 24 bits wide so mask upper 8 bits. | |
// SectionLength is adjusted it is 4 byte aligned. | |
// Go to the next section | |
// | |
SectionLength = *(UINT32 *)Section->Size & 0x00FFFFFF; | |
SectionLength = GET_OCCUPIED_SIZE (SectionLength, 4); | |
ParsedLength += SectionLength; | |
Section = (EFI_COMMON_SECTION_HEADER *)((UINT8 *)Section + SectionLength); | |
} | |
return EFI_NOT_FOUND; | |
} |