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audk/StandaloneMmPkg/Library/FvLib/FvLib.c

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/** @file
Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2016 - 2018, ARM Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Library/FvLib.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#define GET_OCCUPIED_SIZE(ActualSize, Alignment) \
(ActualSize) + (((Alignment) - ((ActualSize) & ((Alignment) - 1))) & ((Alignment) - 1))
/**
Returns the highest bit set of the State field
@param ErasePolarity Erase Polarity as defined by EFI_FVB_ERASE_POLARITY
in the Attributes field.
@param FfsHeader Pointer to FFS File Header.
@return the highest bit in the State field
**/
EFI_FFS_FILE_STATE
GetFileState (
IN UINT8 ErasePolarity,
IN EFI_FFS_FILE_HEADER *FfsHeader
)
{
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;
}
/**
Calculates the checksum of the header of a file.
@param FileHeader Pointer to FFS File Header.
@return Checksum of the header.
**/
UINT8
CalculateHeaderChecksum (
IN EFI_FFS_FILE_HEADER *FileHeader
)
{
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;
}
/**
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.
@param SearchType Filter to find only files of this type.
Type EFI_FV_FILETYPE_ALL causes no filtering to be done.
@param FwVolHeader Pointer to the FV header of the volume to search.
This parameter must point to a valid FFS volume.
@param FileHeader Pointer to the current file from which to begin searching.
This pointer will be updated upon return to reflect the file found.
@retval EFI_NOT_FOUND No files matching the search criteria were found
@retval EFI_SUCCESS
**/
EFI_STATUS
EFIAPI
FfsFindNextFile (
IN EFI_FV_FILETYPE SearchType,
IN EFI_FIRMWARE_VOLUME_HEADER *FwVolHeader,
IN OUT EFI_FFS_FILE_HEADER **FileHeader
)
{
EFI_FIRMWARE_VOLUME_EXT_HEADER *FvExtHeader;
EFI_FFS_FILE_HEADER *FfsFileHeader;
UINT32 FileLength;
UINT32 FileOccupiedSize;
UINT32 FileOffset;
UINT64 FvLength;
UINT8 ErasePolarity;
UINT8 FileState;
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) {
if (FwVolHeader->ExtHeaderOffset != 0) {
FvExtHeader = (EFI_FIRMWARE_VOLUME_EXT_HEADER *)((UINT8 *)FwVolHeader +
FwVolHeader->ExtHeaderOffset);
FfsFileHeader = (EFI_FFS_FILE_HEADER *)((UINT8 *)FvExtHeader +
FvExtHeader->ExtHeaderSize);
} else {
FfsFileHeader = (EFI_FFS_FILE_HEADER *)((UINT8 *)FwVolHeader +
FwVolHeader->HeaderLength);
}
FfsFileHeader = (EFI_FFS_FILE_HEADER *)((UINTN)FwVolHeader +
ALIGN_VALUE((UINTN)FfsFileHeader -
(UINTN)FwVolHeader, 8));
} else {
//
// Length is 24 bits wide so mask upper 8 bits
// FileLength is adjusted to FileOccupiedSize as it is 8 byte aligned.
//
FileLength = FFS_FILE_SIZE(*FileHeader);
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 = FFS_FILE_SIZE(FfsFileHeader);
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 = FFS_FILE_SIZE(FfsFileHeader);
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;
}
/**
Locates a section within a series of sections
with the specified section type.
@param[in] Sections The sections to search
@param[in] SizeOfSections Total size of all sections
@param[in] SectionType The section type to locate
@param[out] FoundSection The FFS section if found
@retval EFI_SUCCESS The file and section was found
@retval EFI_NOT_FOUND The file and section was not found
@retval EFI_VOLUME_CORRUPTED The firmware volume was corrupted
**/
EFI_STATUS
EFIAPI
FindFfsSectionInSections (
IN VOID *Sections,
IN UINTN SizeOfSections,
IN EFI_SECTION_TYPE SectionType,
OUT EFI_COMMON_SECTION_HEADER **FoundSection
)
{
EFI_PHYSICAL_ADDRESS CurrentAddress;
UINT32 Size;
EFI_PHYSICAL_ADDRESS EndOfSections;
EFI_COMMON_SECTION_HEADER *Section;
EFI_PHYSICAL_ADDRESS EndOfSection;
//
// Loop through the FFS file sections
//
EndOfSection = (EFI_PHYSICAL_ADDRESS)(UINTN) Sections;
EndOfSections = EndOfSection + SizeOfSections;
for (;;) {
if (EndOfSection == EndOfSections) {
break;
}
CurrentAddress = EndOfSection;
Section = (EFI_COMMON_SECTION_HEADER*)(UINTN) CurrentAddress;
Size = SECTION_SIZE (Section);
if (Size < sizeof (*Section)) {
return EFI_VOLUME_CORRUPTED;
}
EndOfSection = CurrentAddress + Size;
if (EndOfSection > EndOfSections) {
return EFI_VOLUME_CORRUPTED;
}
Size = GET_OCCUPIED_SIZE (Size, 4);
//
// Look for the requested section type
//
if (Section->Type == SectionType) {
*FoundSection = Section;
return EFI_SUCCESS;
}
}
return EFI_NOT_FOUND;
}
/**
Given the input file pointer, search for the next matching section in the
FFS volume.
@param SearchType Filter to find only sections of this type.
@param FfsFileHeader Pointer to the current file to search.
@param SectionHeader Pointer to the Section matching SectionType in FfsFileHeader.
NULL if section not found
@retval EFI_NOT_FOUND No files matching the search criteria were found
@retval EFI_SUCCESS
**/
EFI_STATUS
EFIAPI
FfsFindSection (
IN EFI_SECTION_TYPE SectionType,
IN EFI_FFS_FILE_HEADER *FfsFileHeader,
IN OUT EFI_COMMON_SECTION_HEADER **SectionHeader
)
{
UINT32 FileSize;
EFI_COMMON_SECTION_HEADER *Section;
EFI_STATUS Status;
//
// 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 = FFS_FILE_SIZE(FfsFileHeader);
FileSize -= sizeof (EFI_FFS_FILE_HEADER);
Status = FindFfsSectionInSections (
Section,
FileSize,
SectionType,
SectionHeader
);
return Status;
}
/**
Given the input file pointer, search for the next matching section in the
FFS volume.
@param SearchType Filter to find only sections of this type.
@param FfsFileHeader Pointer to the current file to search.
@param SectionData Pointer to the Section matching SectionType in FfsFileHeader.
NULL if section not found
@param SectionDataSize The size of SectionData
@retval EFI_NOT_FOUND No files matching the search criteria were found
@retval EFI_SUCCESS
**/
EFI_STATUS
EFIAPI
FfsFindSectionData (
IN EFI_SECTION_TYPE SectionType,
IN EFI_FFS_FILE_HEADER *FfsFileHeader,
IN OUT VOID **SectionData,
IN OUT UINTN *SectionDataSize
)
{
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 = FFS_FILE_SIZE(FfsFileHeader);
FileSize -= sizeof (EFI_FFS_FILE_HEADER);
*SectionData = NULL;
ParsedLength = 0;
while (ParsedLength < FileSize) {
if (Section->Type == SectionType) {
*SectionData = (VOID *) (Section + 1);
*SectionDataSize = SECTION_SIZE(Section);
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 = SECTION_SIZE(Section);
SectionLength = GET_OCCUPIED_SIZE (SectionLength, 4);
ParsedLength += SectionLength;
Section = (EFI_COMMON_SECTION_HEADER *) ((UINT8 *) Section + SectionLength);
}
return EFI_NOT_FOUND;
}
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