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/** @file
Implements functions to read firmware file
Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
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 "DxeMain.h"
#include "FwVolDriver.h"
/**
Required Alignment Alignment Value in FFS Alignment Value in
(bytes) Attributes Field Firmware Volume Interfaces
1 0 0
2 0 1
4 0 2
8 0 3
16 1 4
128 2 7
512 3 9
1 KB 4 10
4 KB 5 12
32 KB 6 15
64 KB 7 16
**/
UINT8 mFvAttributes[] = {0, 4, 7, 9, 10, 12, 15, 16};
/**
Convert the FFS File Attributes to FV File Attributes
@param FfsAttributes The attributes of UINT8 type.
@return The attributes of EFI_FV_FILE_ATTRIBUTES
**/
EFI_FV_FILE_ATTRIBUTES
FfsAttributes2FvFileAttributes (
IN EFI_FFS_FILE_ATTRIBUTES FfsAttributes
)
{
FfsAttributes = (EFI_FFS_FILE_ATTRIBUTES)((FfsAttributes & FFS_ATTRIB_DATA_ALIGNMENT) >> 3);
ASSERT (FfsAttributes < 8);
return (EFI_FV_FILE_ATTRIBUTES) mFvAttributes[FfsAttributes];
}
/**
Given the input key, search for the next matching file in the volume.
@param This Indicates the calling context.
@param Key Key is a pointer to a caller allocated
buffer that contains implementation specific
data that is used to track where to begin
the search for the next file. The size of
the buffer must be at least This->KeySize
bytes long. To reinitialize the search and
begin from the beginning of the firmware
volume, the entire buffer must be cleared to
zero. Other than clearing the buffer to
initiate a new search, the caller must not
modify the data in the buffer between calls
to GetNextFile().
@param FileType FileType is a pointer to a caller allocated
EFI_FV_FILETYPE. The GetNextFile() API can
filter it's search for files based on the
value of *FileType input. A *FileType input
of 0 causes GetNextFile() to search for
files of all types. If a file is found, the
file's type is returned in *FileType.
*FileType is not modified if no file is
found.
@param NameGuid NameGuid is a pointer to a caller allocated
EFI_GUID. If a file is found, the file's
name is returned in *NameGuid. *NameGuid is
not modified if no file is found.
@param Attributes Attributes is a pointer to a caller
allocated EFI_FV_FILE_ATTRIBUTES. If a file
is found, the file's attributes are returned
in *Attributes. *Attributes is not modified
if no file is found.
@param Size Size is a pointer to a caller allocated
UINTN. If a file is found, the file's size
is returned in *Size. *Size is not modified
if no file is found.
@retval EFI_SUCCESS Successfully find the file.
@retval EFI_DEVICE_ERROR Device error.
@retval EFI_ACCESS_DENIED Fv could not read.
@retval EFI_NOT_FOUND No matching file found.
@retval EFI_INVALID_PARAMETER Invalid parameter
**/
EFI_STATUS
EFIAPI
FvGetNextFile (
IN CONST EFI_FIRMWARE_VOLUME2_PROTOCOL *This,
IN OUT VOID *Key,
IN OUT EFI_FV_FILETYPE *FileType,
OUT EFI_GUID *NameGuid,
OUT EFI_FV_FILE_ATTRIBUTES *Attributes,
OUT UINTN *Size
)
{
EFI_STATUS Status;
FV_DEVICE *FvDevice;
EFI_FV_ATTRIBUTES FvAttributes;
EFI_FFS_FILE_HEADER *FfsFileHeader;
UINTN *KeyValue;
LIST_ENTRY *Link;
FFS_FILE_LIST_ENTRY *FfsFileEntry;
UINTN FileLength;
FvDevice = FV_DEVICE_FROM_THIS (This);
Status = FvGetVolumeAttributes (This, &FvAttributes);
if (EFI_ERROR (Status)){
return Status;
}
//
// Check if read operation is enabled
//
if ((FvAttributes & EFI_FV2_READ_STATUS) == 0) {
return EFI_ACCESS_DENIED;
}
if (*FileType > EFI_FV_FILETYPE_SMM_CORE) {
//
// File type needs to be in 0 - 0x0D
//
return EFI_NOT_FOUND;
}
KeyValue = (UINTN *)Key;
for (;;) {
if (*KeyValue == 0) {
//
// Search for 1st matching file
//
Link = &FvDevice->FfsFileListHeader;
} else {
//
// Key is pointer to FFsFileEntry, so get next one
//
Link = (LIST_ENTRY *)(*KeyValue);
}
if (Link->ForwardLink == &FvDevice->FfsFileListHeader) {
//
// Next is end of list so we did not find data
//
return EFI_NOT_FOUND;
}
FfsFileEntry = (FFS_FILE_LIST_ENTRY *)Link->ForwardLink;
FfsFileHeader = (EFI_FFS_FILE_HEADER *)FfsFileEntry->FfsHeader;
//
// remember the key
//
*KeyValue = (UINTN)FfsFileEntry;
if (FfsFileHeader->Type == EFI_FV_FILETYPE_FFS_PAD) {
//
// we ignore pad files
//
continue;
}
if (*FileType == EFI_FV_FILETYPE_ALL) {
//
// Process all file types so we have a match
//
break;
}
if (*FileType == FfsFileHeader->Type) {
//
// Found a matching file type
//
break;
}
}
//
// Return FileType, NameGuid, and Attributes
//
*FileType = FfsFileHeader->Type;
CopyGuid (NameGuid, &FfsFileHeader->Name);
*Attributes = FfsAttributes2FvFileAttributes (FfsFileHeader->Attributes);
//
// Read four bytes out of the 3 byte array and throw out extra data
//
FileLength = *(UINT32 *)&FfsFileHeader->Size[0] & 0x00FFFFFF;
//
// we need to substract the header size
//
*Size = FileLength - sizeof(EFI_FFS_FILE_HEADER);
return EFI_SUCCESS;
}
/**
Locates a file in the firmware volume and
copies it to the supplied buffer.
@param This Indicates the calling context.
@param NameGuid Pointer to an EFI_GUID, which is the
filename.
@param Buffer Buffer is a pointer to pointer to a buffer
in which the file or section contents or are
returned.
@param BufferSize BufferSize is a pointer to caller allocated
UINTN. On input *BufferSize indicates the
size in bytes of the memory region pointed
to by Buffer. On output, *BufferSize
contains the number of bytes required to
read the file.
@param FoundType FoundType is a pointer to a caller allocated
EFI_FV_FILETYPE that on successful return
from Read() contains the type of file read.
This output reflects the file type
irrespective of the value of the SectionType
input.
@param FileAttributes FileAttributes is a pointer to a caller
allocated EFI_FV_FILE_ATTRIBUTES. On
successful return from Read(),
*FileAttributes contains the attributes of
the file read.
@param AuthenticationStatus AuthenticationStatus is a pointer to a
caller allocated UINTN in which the
authentication status is returned.
@retval EFI_SUCCESS Successfully read to memory buffer.
@retval EFI_WARN_BUFFER_TOO_SMALL Buffer too small.
@retval EFI_NOT_FOUND Not found.
@retval EFI_DEVICE_ERROR Device error.
@retval EFI_ACCESS_DENIED Could not read.
@retval EFI_INVALID_PARAMETER Invalid parameter.
@retval EFI_OUT_OF_RESOURCES Not enough buffer to be allocated.
**/
EFI_STATUS
EFIAPI
FvReadFile (
IN CONST EFI_FIRMWARE_VOLUME2_PROTOCOL *This,
IN CONST EFI_GUID *NameGuid,
IN OUT VOID **Buffer,
IN OUT UINTN *BufferSize,
OUT EFI_FV_FILETYPE *FoundType,
OUT EFI_FV_FILE_ATTRIBUTES *FileAttributes,
OUT UINT32 *AuthenticationStatus
)
{
EFI_STATUS Status;
FV_DEVICE *FvDevice;
EFI_GUID SearchNameGuid;
EFI_FV_FILETYPE LocalFoundType;
EFI_FV_FILE_ATTRIBUTES LocalAttributes;
UINTN FileSize;
UINT8 *SrcPtr;
EFI_FFS_FILE_HEADER *FfsHeader;
UINTN InputBufferSize;
if (NameGuid == NULL) {
return EFI_INVALID_PARAMETER;
}
FvDevice = FV_DEVICE_FROM_THIS (This);
//
// Keep looking until we find the matching NameGuid.
// The Key is really an FfsFileEntry
//
FvDevice->LastKey = 0;
do {
LocalFoundType = 0;
Status = FvGetNextFile (
This,
&FvDevice->LastKey,
&LocalFoundType,
&SearchNameGuid,
&LocalAttributes,
&FileSize
);
if (EFI_ERROR (Status)) {
return EFI_NOT_FOUND;
}
} while (!CompareGuid (&SearchNameGuid, NameGuid));
//
// Get a pointer to the header
//
FfsHeader = FvDevice->LastKey->FfsHeader;
//
// Remember callers buffer size
//
InputBufferSize = *BufferSize;
//
// Calculate return values
//
*FoundType = FfsHeader->Type;
*FileAttributes = FfsAttributes2FvFileAttributes (FfsHeader->Attributes);
*AuthenticationStatus = 0;
*BufferSize = FileSize;
if (Buffer == NULL) {
//
// If Buffer is NULL, we only want to get the information colected so far
//
return EFI_SUCCESS;
}
//
// Skip over file header
//
SrcPtr = ((UINT8 *)FfsHeader) + sizeof (EFI_FFS_FILE_HEADER);
Status = EFI_SUCCESS;
if (*Buffer == NULL) {
//
// Caller passed in a pointer so allocate buffer for them
//
*Buffer = AllocatePool (FileSize);
if (*Buffer == NULL) {
return EFI_OUT_OF_RESOURCES;
}
} else if (FileSize > InputBufferSize) {
//
// Callers buffer was not big enough
//
Status = EFI_WARN_BUFFER_TOO_SMALL;
FileSize = InputBufferSize;
}
//
// Copy data into callers buffer
//
CopyMem (*Buffer, SrcPtr, FileSize);
return Status;
}
/**
Locates a section in a given FFS File and
copies it to the supplied buffer (not including section header).
@param This Indicates the calling context.
@param NameGuid Pointer to an EFI_GUID, which is the
filename.
@param SectionType Indicates the section type to return.
@param SectionInstance Indicates which instance of sections with a
type of SectionType to return.
@param Buffer Buffer is a pointer to pointer to a buffer
in which the file or section contents or are
returned.
@param BufferSize BufferSize is a pointer to caller allocated
UINTN.
@param AuthenticationStatus AuthenticationStatus is a pointer to a
caller allocated UINT32 in which the
authentication status is returned.
@retval EFI_SUCCESS Successfully read the file section into
buffer.
@retval EFI_WARN_BUFFER_TOO_SMALL Buffer too small.
@retval EFI_NOT_FOUND Section not found.
@retval EFI_DEVICE_ERROR Device error.
@retval EFI_ACCESS_DENIED Could not read.
@retval EFI_INVALID_PARAMETER Invalid parameter.
**/
EFI_STATUS
EFIAPI
FvReadFileSection (
IN CONST EFI_FIRMWARE_VOLUME2_PROTOCOL *This,
IN CONST EFI_GUID *NameGuid,
IN EFI_SECTION_TYPE SectionType,
IN UINTN SectionInstance,
IN OUT VOID **Buffer,
IN OUT UINTN *BufferSize,
OUT UINT32 *AuthenticationStatus
)
{
EFI_STATUS Status;
FV_DEVICE *FvDevice;
EFI_FV_FILETYPE FileType;
EFI_FV_FILE_ATTRIBUTES FileAttributes;
UINTN FileSize;
UINT8 *FileBuffer;
FFS_FILE_LIST_ENTRY *FfsEntry;
if (NameGuid == NULL || Buffer == NULL) {
return EFI_INVALID_PARAMETER;
}
FvDevice = FV_DEVICE_FROM_THIS (This);
//
// Read the whole file into buffer
//
FileBuffer = NULL;
Status = FvReadFile (
This,
NameGuid,
(VOID **)&FileBuffer,
&FileSize,
&FileType,
&FileAttributes,
AuthenticationStatus
);
//
// Get the last key used by our call to FvReadFile as it is the FfsEntry for this file.
//
FfsEntry = (FFS_FILE_LIST_ENTRY *) FvDevice->LastKey;
if (EFI_ERROR (Status)) {
return Status;
}
//
// Check to see that the file actually HAS sections before we go any further.
//
if (FileType == EFI_FV_FILETYPE_RAW) {
Status = EFI_NOT_FOUND;
goto Done;
}
//
// Use FfsEntry to cache Section Extraction Protocol Inforomation
//
if (FfsEntry->StreamHandle == 0) {
Status = OpenSectionStream (
FileSize,
FileBuffer,
&FfsEntry->StreamHandle
);
if (EFI_ERROR (Status)) {
goto Done;
}
}
//
// If SectionType == 0 We need the whole section stream
//
Status = GetSection (
FfsEntry->StreamHandle,
(SectionType == 0) ? NULL : &SectionType,
NULL,
(SectionType == 0) ? 0 : SectionInstance,
Buffer,
BufferSize,
AuthenticationStatus
);
//
// Close of stream defered to close of FfsHeader list to allow SEP to cache data
//
Done:
CoreFreePool (FileBuffer);
return Status;
}
|