audk/ArmPlatformPkg/FileSystem/BootMonFs/BootMonFsDir.c

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/** @file
*
* Copyright (c) 2012-2014, ARM Limited. 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.
*
**/
#include "BootMonFsInternal.h"
EFIAPI
EFI_STATUS
OpenBootMonFsOpenVolume (
IN EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *This,
OUT EFI_FILE_PROTOCOL **Root
)
{
BOOTMON_FS_INSTANCE *Instance;
Instance = BOOTMON_FS_FROM_FS_THIS (This);
if (Instance == NULL) {
return EFI_DEVICE_ERROR;
}
Instance->RootFile->Info->Attribute = EFI_FILE_READ_ONLY | EFI_FILE_DIRECTORY;
*Root = &Instance->RootFile->File;
return EFI_SUCCESS;
}
UINT32
BootMonFsGetImageLength (
IN BOOTMON_FS_FILE *File
)
{
UINT32 Index;
UINT32 FileSize;
LIST_ENTRY *RegionToFlushLink;
BOOTMON_FS_FILE_REGION *Region;
FileSize = 0;
// Look at all Flash areas to determine file size
for (Index = 0; Index < HW_IMAGE_DESCRIPTION_REGION_MAX; Index++) {
FileSize += File->HwDescription.Region[Index].Size;
}
// Add the regions that have not been flushed yet
for (RegionToFlushLink = GetFirstNode (&File->RegionToFlushLink);
!IsNull (&File->RegionToFlushLink, RegionToFlushLink);
RegionToFlushLink = GetNextNode (&File->RegionToFlushLink, RegionToFlushLink)
)
{
Region = (BOOTMON_FS_FILE_REGION*)RegionToFlushLink;
if (Region->Offset + Region->Size > FileSize) {
FileSize += Region->Offset + Region->Size;
}
}
return FileSize;
}
UINTN
BootMonFsGetPhysicalSize (
IN BOOTMON_FS_FILE* File
)
{
// Return 0 for files that haven't yet been flushed to media
if (File->HwDescription.RegionCount == 0) {
return 0;
}
return ((File->HwDescription.BlockEnd - File->HwDescription.BlockStart) + 1 )
* File->Instance->Media->BlockSize;
}
EFIAPI
EFI_STATUS
BootMonFsSetDirPosition (
IN EFI_FILE_PROTOCOL *This,
IN UINT64 Position
)
{
BOOTMON_FS_FILE *File;
File = BOOTMON_FS_FILE_FROM_FILE_THIS (This);
if (File == NULL) {
return EFI_INVALID_PARAMETER;
}
// UEFI Spec section 12.5:
// "The seek request for nonzero is not valid on open directories."
if (Position != 0) {
return EFI_UNSUPPORTED;
}
File->Position = Position;
return EFI_SUCCESS;
}
EFI_STATUS
BootMonFsOpenDirectory (
OUT EFI_FILE_PROTOCOL **NewHandle,
IN CHAR16 *FileName,
IN BOOTMON_FS_INSTANCE *Volume
)
{
ASSERT(0);
return EFI_UNSUPPORTED;
}
STATIC
EFI_STATUS
GetFileSystemVolumeLabelInfo (
IN BOOTMON_FS_INSTANCE *Instance,
IN OUT UINTN *BufferSize,
OUT VOID *Buffer
)
{
UINTN Size;
EFI_FILE_SYSTEM_VOLUME_LABEL *Label;
EFI_STATUS Status;
Label = Buffer;
// Value returned by StrSize includes null terminator.
Size = SIZE_OF_EFI_FILE_SYSTEM_VOLUME_LABEL
+ StrSize (Instance->FsInfo.VolumeLabel);
if (*BufferSize >= Size) {
CopyMem (&Label->VolumeLabel, &Instance->FsInfo.VolumeLabel, Size);
Status = EFI_SUCCESS;
} else {
Status = EFI_BUFFER_TOO_SMALL;
}
*BufferSize = Size;
return Status;
}
// Helper function that calculates a rough "free space" by:
// - Taking the media size
// - Subtracting the sum of all file sizes
// - Subtracting the block size times the number of files
// (To account for the blocks containing the HW_IMAGE_INFO
STATIC
UINT64
ComputeFreeSpace (
IN BOOTMON_FS_INSTANCE *Instance
)
{
LIST_ENTRY *FileLink;
UINT64 FileSizeSum;
UINT64 MediaSize;
UINTN NumFiles;
EFI_BLOCK_IO_MEDIA *Media;
BOOTMON_FS_FILE *File;
Media = Instance->BlockIo->Media;
MediaSize = Media->BlockSize * (Media->LastBlock + 1);
NumFiles = 0;
FileSizeSum = 0;
for (FileLink = GetFirstNode (&Instance->RootFile->Link);
!IsNull (&Instance->RootFile->Link, FileLink);
FileLink = GetNextNode (&Instance->RootFile->Link, FileLink)
)
{
File = BOOTMON_FS_FILE_FROM_LINK_THIS (FileLink);
FileSizeSum += BootMonFsGetImageLength (File);
NumFiles++;
}
return MediaSize - (FileSizeSum + (Media->BlockSize + NumFiles));
}
STATIC
EFI_STATUS
GetFilesystemInfo (
IN BOOTMON_FS_INSTANCE *Instance,
IN OUT UINTN *BufferSize,
OUT VOID *Buffer
)
{
EFI_STATUS Status;
if (*BufferSize >= Instance->FsInfo.Size) {
Instance->FsInfo.FreeSpace = ComputeFreeSpace (Instance);
CopyMem (Buffer, &Instance->FsInfo, Instance->FsInfo.Size);
Status = EFI_SUCCESS;
} else {
Status = EFI_BUFFER_TOO_SMALL;
}
*BufferSize = Instance->FsInfo.Size;
return Status;
}
STATIC
EFI_STATUS
GetFileInfo (
IN BOOTMON_FS_INSTANCE *Instance,
IN BOOTMON_FS_FILE *File,
IN OUT UINTN *BufferSize,
OUT VOID *Buffer
)
{
EFI_FILE_INFO *Info;
UINTN ResultSize;
ResultSize = SIZE_OF_EFI_FILE_INFO + StrSize (File->Info->FileName);
if (*BufferSize < ResultSize) {
*BufferSize = ResultSize;
return EFI_BUFFER_TOO_SMALL;
}
Info = Buffer;
CopyMem (Info, File->Info, ResultSize);
// Size of the information
Info->Size = ResultSize;
*BufferSize = ResultSize;
return EFI_SUCCESS;
}
STATIC
EFI_STATUS
GetBootMonFsFileInfo (
IN BOOTMON_FS_INSTANCE *Instance,
IN BOOTMON_FS_FILE *File,
IN OUT UINTN *BufferSize,
OUT VOID *Buffer
)
{
EFI_STATUS Status;
BOOTMON_FS_FILE_INFO *Info;
UINTN ResultSize;
UINTN Index;
if (File == Instance->RootFile) {
Status = EFI_UNSUPPORTED;
} else {
ResultSize = SIZE_OF_BOOTMON_FS_FILE_INFO;
if (*BufferSize < ResultSize) {
*BufferSize = ResultSize;
Status = EFI_BUFFER_TOO_SMALL;
} else {
Info = Buffer;
// Zero out the structure
ZeroMem (Info, ResultSize);
// Fill in the structure
Info->Size = ResultSize;
Info->EntryPoint = File->HwDescription.EntryPoint;
Info->RegionCount = File->HwDescription.RegionCount;
for (Index = 0; Index < File->HwDescription.RegionCount; Index++) {
Info->Region[Index].LoadAddress = File->HwDescription.Region[Index].LoadAddress;
Info->Region[Index].Size = File->HwDescription.Region[Index].Size;
Info->Region[Index].Offset = File->HwDescription.Region[Index].Offset;
Info->Region[Index].Checksum = File->HwDescription.Region[Index].Checksum;
}
*BufferSize = ResultSize;
Status = EFI_SUCCESS;
}
}
return Status;
}
/**
Set the name of a file.
This is a helper function for SetFileInfo().
@param[in] Instance A pointer to the description of the volume
the file belongs to.
@param[in] File A pointer to the description of the file.
@param[in] FileName A pointer to the new name of the file.
@retval EFI_SUCCESS The name was set.
@retval EFI_ACCESS_DENIED An attempt is made to change the name of a file
to a file that is already present.
**/
STATIC
EFI_STATUS
SetFileName (
IN BOOTMON_FS_INSTANCE *Instance,
IN BOOTMON_FS_FILE *File,
IN CONST CHAR16 *FileName
)
{
CHAR8 AsciiFileName[MAX_NAME_LENGTH];
BOOTMON_FS_FILE *SameFile;
// If the file path start with a \ strip it. The EFI Shell may
// insert a \ in front of the file name.
if (FileName[0] == L'\\') {
FileName++;
}
UnicodeStrToAsciiStrS (FileName, AsciiFileName, MAX_NAME_LENGTH);
if (BootMonGetFileFromAsciiFileName (
File->Instance,
AsciiFileName,
&SameFile
) != EFI_NOT_FOUND) {
// A file with that name already exists.
return EFI_ACCESS_DENIED;
} else {
// OK, change the filename.
AsciiStrToUnicodeStrS (AsciiFileName, File->Info->FileName,
(File->Info->Size - SIZE_OF_EFI_FILE_INFO) / sizeof (CHAR16));
return EFI_SUCCESS;
}
}
/**
Set the size of a file.
This is a helper function for SetFileInfo().
@param[in] Instance A pointer to the description of the volume
the file belongs to.
@param[in] File A pointer to the description of the file.
@param[in] NewSize The requested new size for the file.
@retval EFI_SUCCESS The size was set.
@retval EFI_OUT_OF_RESOURCES An allocation needed to process the request failed.
**/
STATIC
EFI_STATUS
SetFileSize (
IN BOOTMON_FS_INSTANCE *Instance,
IN BOOTMON_FS_FILE *BootMonFsFile,
IN UINTN NewSize
)
{
EFI_STATUS Status;
UINT32 OldSize;
LIST_ENTRY *RegionToFlushLink;
LIST_ENTRY *NextRegionToFlushLink;
BOOTMON_FS_FILE_REGION *Region;
EFI_FILE_PROTOCOL *File;
CHAR8 *Buffer;
UINTN BufferSize;
UINT64 StoredPosition;
OldSize = BootMonFsFile->Info->FileSize;
//
// In case of file truncation, force the regions waiting for writing to
// not overflow the new size of the file.
//
if (NewSize < OldSize) {
for (RegionToFlushLink = GetFirstNode (&BootMonFsFile->RegionToFlushLink);
!IsNull (&BootMonFsFile->RegionToFlushLink, RegionToFlushLink);
)
{
NextRegionToFlushLink = GetNextNode (&BootMonFsFile->RegionToFlushLink, RegionToFlushLink);
Region = (BOOTMON_FS_FILE_REGION*)RegionToFlushLink;
if (Region->Offset > NewSize) {
RemoveEntryList (RegionToFlushLink);
FreePool (Region->Buffer);
FreePool (Region);
} else {
Region->Size = MIN (Region->Size, NewSize - Region->Offset);
}
RegionToFlushLink = NextRegionToFlushLink;
}
} else if (NewSize > OldSize) {
// Increasing a file's size is potentially complicated as it may require
// moving the image description on media. The simplest way to do it is to
// seek past the end of the file (which is valid in UEFI) and perform a
// Write.
File = &BootMonFsFile->File;
// Save position
Status = File->GetPosition (File, &StoredPosition);
if (EFI_ERROR (Status)) {
return Status;
}
// Set position at the end of the file
Status = File->SetPosition (File, OldSize);
if (EFI_ERROR (Status)) {
return Status;
}
BufferSize = NewSize - OldSize;
Buffer = AllocateZeroPool (BufferSize);
if (Buffer == NULL) {
return EFI_OUT_OF_RESOURCES;
}
Status = File->Write (File, &BufferSize, Buffer);
FreePool (Buffer);
if (EFI_ERROR (Status)) {
return Status;
}
// Restore saved position
Status = File->SetPosition (File, StoredPosition);
if (EFI_ERROR (Status)) {
return Status;
}
}
BootMonFsFile->Info->FileSize = NewSize;
return EFI_SUCCESS;
}
/**
Set information about a file.
@param[in] Instance A pointer to the description of the volume
the file belongs to.
@param[in] File A pointer to the description of the file.
@param[in] Info A pointer to the file information to write.
@retval EFI_SUCCESS The information was set.
@retval EFI_ACCESS_DENIED An attempt is being made to change the
EFI_FILE_DIRECTORY Attribute.
@retval EFI_ACCESS_DENIED The file was opened in read-only mode and an
attempt is being made to modify a field other
than Attribute.
@retval EFI_ACCESS_DENIED An attempt is made to change the name of a file
to a file that is already present.
@retval EFI_WRITE_PROTECTED An attempt is being made to modify a read-only
attribute.
@retval EFI_OUT_OF_RESOURCES An allocation needed to process the request
failed.
**/
STATIC
EFI_STATUS
SetFileInfo (
IN BOOTMON_FS_INSTANCE *Instance,
IN BOOTMON_FS_FILE *File,
IN EFI_FILE_INFO *Info
)
{
EFI_STATUS Status;
BOOLEAN FileSizeIsDifferent;
BOOLEAN FileNameIsDifferent;
BOOLEAN TimeIsDifferent;
//
// A directory can not be changed to a file and a file can
// not be changed to a directory.
//
if ((Info->Attribute & EFI_FILE_DIRECTORY) !=
(File->Info->Attribute & EFI_FILE_DIRECTORY) ) {
return EFI_ACCESS_DENIED;
}
FileSizeIsDifferent = (Info->FileSize != File->Info->FileSize);
FileNameIsDifferent = (StrnCmp (
Info->FileName,
File->Info->FileName,
MAX_NAME_LENGTH - 1
) != 0);
//
// Check if the CreateTime, LastAccess or ModificationTime
// have been changed. The file system does not support file
// timestamps thus the three times in "File->Info" are
// always equal to zero. The following comparison actually
// checks if all three times are still equal to 0 or not.
//
TimeIsDifferent = CompareMem (
&Info->CreateTime,
&File->Info->CreateTime,
3 * sizeof (EFI_TIME)
) != 0;
//
// For a file opened in read-only mode, only the Attribute field can be
// modified. The root directory open mode is forced to read-only at opening
// thus the following test protects the root directory to be somehow modified.
//
if (File->OpenMode == EFI_FILE_MODE_READ) {
if (FileSizeIsDifferent || FileNameIsDifferent || TimeIsDifferent) {
return EFI_ACCESS_DENIED;
}
}
if (TimeIsDifferent) {
return EFI_WRITE_PROTECTED;
}
if (FileSizeIsDifferent) {
Status = SetFileSize (Instance, File, Info->FileSize);
if (EFI_ERROR (Status)) {
return Status;
}
}
//
// Note down in RAM the Attribute field but we can not
// ask to store it in flash for the time being.
//
File->Info->Attribute = Info->Attribute;
if (FileNameIsDifferent) {
Status = SetFileName (Instance, File, Info->FileName);
if (EFI_ERROR (Status)) {
return Status;
}
}
return EFI_SUCCESS;
}
EFIAPI
EFI_STATUS
BootMonFsGetInfo (
IN EFI_FILE_PROTOCOL *This,
IN EFI_GUID *InformationType,
IN OUT UINTN *BufferSize,
OUT VOID *Buffer
)
{
EFI_STATUS Status;
BOOTMON_FS_FILE *File;
BOOTMON_FS_INSTANCE *Instance;
if ((This == NULL) ||
(InformationType == NULL) ||
(BufferSize == NULL) ||
((Buffer == NULL) && (*BufferSize > 0)) ) {
return EFI_INVALID_PARAMETER;
}
File = BOOTMON_FS_FILE_FROM_FILE_THIS (This);
if (File->Info == NULL) {
return EFI_INVALID_PARAMETER;
}
Instance = File->Instance;
// If the instance has not been initialized yet then do it ...
if (!Instance->Initialized) {
Status = BootMonFsInitialize (Instance);
} else {
Status = EFI_SUCCESS;
}
if (!EFI_ERROR (Status)) {
if (CompareGuid (InformationType, &gEfiFileSystemVolumeLabelInfoIdGuid)
!= 0) {
Status = GetFileSystemVolumeLabelInfo (Instance, BufferSize, Buffer);
} else if (CompareGuid (InformationType, &gEfiFileSystemInfoGuid) != 0) {
Status = GetFilesystemInfo (Instance, BufferSize, Buffer);
} else if (CompareGuid (InformationType, &gEfiFileInfoGuid) != 0) {
Status = GetFileInfo (Instance, File, BufferSize, Buffer);
} else if (CompareGuid (InformationType, &gArmBootMonFsFileInfoGuid) != 0) {
Status = GetBootMonFsFileInfo (Instance, File, BufferSize, Buffer);
} else {
Status = EFI_UNSUPPORTED;
}
}
return Status;
}
/**
Set information about a file or a volume.
@param[in] This A pointer to the EFI_FILE_PROTOCOL instance that
is the file handle the information is for.
@param[in] InformationType The type identifier for the information being set :
EFI_FILE_INFO_ID or EFI_FILE_SYSTEM_INFO_ID or
EFI_FILE_SYSTEM_VOLUME_LABEL_ID
@param[in] BufferSize The size, in bytes, of Buffer.
@param[in] Buffer A pointer to the data buffer to write. The type of the
data inside the buffer is indicated by InformationType.
@retval EFI_SUCCESS The information was set.
@retval EFI_UNSUPPORTED The InformationType is not known.
@retval EFI_DEVICE_ERROR The last issued semi-hosting operation failed.
@retval EFI_ACCESS_DENIED An attempt is made to change the name of a file
to a file that is already present.
@retval EFI_ACCESS_DENIED An attempt is being made to change the
EFI_FILE_DIRECTORY Attribute.
@retval EFI_ACCESS_DENIED InformationType is EFI_FILE_INFO_ID and
the file was opened in read-only mode and an
attempt is being made to modify a field other
than Attribute.
@retval EFI_WRITE_PROTECTED An attempt is being made to modify a read-only
attribute.
@retval EFI_BAD_BUFFER_SIZE The size of the buffer is lower than that indicated by
the data inside the buffer.
@retval EFI_OUT_OF_RESOURCES A allocation needed to process the request failed.
@retval EFI_INVALID_PARAMETER At least one of the parameters is invalid.
**/
EFIAPI
EFI_STATUS
BootMonFsSetInfo (
IN EFI_FILE_PROTOCOL *This,
IN EFI_GUID *InformationType,
IN UINTN BufferSize,
IN VOID *Buffer
)
{
BOOTMON_FS_FILE *File;
EFI_FILE_INFO *Info;
EFI_FILE_SYSTEM_INFO *SystemInfo;
if ((This == NULL) ||
(InformationType == NULL) ||
(Buffer == NULL) ) {
return EFI_INVALID_PARAMETER;
}
File = BOOTMON_FS_FILE_FROM_FILE_THIS (This);
if (File->Info == NULL) {
return EFI_INVALID_PARAMETER;
}
if (CompareGuid (InformationType, &gEfiFileInfoGuid)) {
Info = Buffer;
if (Info->Size < (SIZE_OF_EFI_FILE_INFO + StrSize (Info->FileName))) {
return EFI_INVALID_PARAMETER;
}
if (BufferSize < Info->Size) {
return EFI_BAD_BUFFER_SIZE;
}
return (SetFileInfo (File->Instance, File, Info));
}
//
// The only writable field in the other two information types
// (i.e. EFI_FILE_SYSTEM_INFO and EFI_FILE_SYSTEM_VOLUME_LABEL) is the
// filesystem volume label. This can be retrieved with GetInfo, but it is
// hard-coded into this driver, not stored on media.
//
if (CompareGuid (InformationType, &gEfiFileSystemInfoGuid)) {
SystemInfo = Buffer;
if (SystemInfo->Size <
(SIZE_OF_EFI_FILE_SYSTEM_INFO + StrSize (SystemInfo->VolumeLabel))) {
return EFI_INVALID_PARAMETER;
}
if (BufferSize < SystemInfo->Size) {
return EFI_BAD_BUFFER_SIZE;
}
return EFI_WRITE_PROTECTED;
}
if (CompareGuid (InformationType, &gEfiFileSystemVolumeLabelInfoIdGuid)) {
return EFI_WRITE_PROTECTED;
}
return EFI_UNSUPPORTED;
}
EFIAPI
EFI_STATUS
BootMonFsReadDirectory (
IN EFI_FILE_PROTOCOL *This,
IN OUT UINTN *BufferSize,
OUT VOID *Buffer
)
{
BOOTMON_FS_INSTANCE *Instance;
BOOTMON_FS_FILE *RootFile;
BOOTMON_FS_FILE *File;
EFI_FILE_INFO *Info;
UINTN NameSize;
UINTN ResultSize;
EFI_STATUS Status;
UINTN Index;
RootFile = BOOTMON_FS_FILE_FROM_FILE_THIS (This);
if (RootFile == NULL) {
return EFI_INVALID_PARAMETER;
}
Instance = RootFile->Instance;
Status = BootMonGetFileFromPosition (Instance, RootFile->Position, &File);
if (EFI_ERROR (Status)) {
// No more file
*BufferSize = 0;
return EFI_SUCCESS;
}
NameSize = AsciiStrLen (File->HwDescription.Footer.Filename) + 1;
ResultSize = SIZE_OF_EFI_FILE_INFO + (NameSize * sizeof (CHAR16));
if (*BufferSize < ResultSize) {
*BufferSize = ResultSize;
return EFI_BUFFER_TOO_SMALL;
}
// Zero out the structure
Info = Buffer;
ZeroMem (Info, ResultSize);
// Fill in the structure
Info->Size = ResultSize;
Info->FileSize = BootMonFsGetImageLength (File);
Info->PhysicalSize = BootMonFsGetPhysicalSize (File);
for (Index = 0; Index < NameSize; Index++) {
Info->FileName[Index] = File->HwDescription.Footer.Filename[Index];
}
*BufferSize = ResultSize;
RootFile->Position++;
return EFI_SUCCESS;
}
EFIAPI
EFI_STATUS
BootMonFsFlushDirectory (
IN EFI_FILE_PROTOCOL *This
)
{
BOOTMON_FS_FILE *RootFile;
LIST_ENTRY *ListFiles;
LIST_ENTRY *Link;
BOOTMON_FS_FILE *File;
RootFile = BOOTMON_FS_FILE_FROM_FILE_THIS (This);
if (RootFile == NULL) {
return EFI_INVALID_PARAMETER;
}
ListFiles = &RootFile->Link;
if (IsListEmpty (ListFiles)) {
return EFI_SUCCESS;
}
//
// Flush all the files that need to be flushed
//
// Go through all the list of files to flush them
for (Link = GetFirstNode (ListFiles);
!IsNull (ListFiles, Link);
Link = GetNextNode (ListFiles, Link)
)
{
File = BOOTMON_FS_FILE_FROM_LINK_THIS (Link);
File->File.Flush (&File->File);
}
return EFI_SUCCESS;
}