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audk/MdePkg/Library/DxeServicesLib/DxeServicesLib.c

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/** @file
MDE DXE Services Library provides functions that simplify the development of DXE Drivers.
These functions help access data from sections of FFS files or from file path.
Copyright (c) 2007 - 2015, 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 <PiDxe.h>
#include <Library/DebugLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/DevicePathLib.h>
#include <Library/UefiLib.h>
#include <Library/DxeServicesLib.h>
#include <Protocol/FirmwareVolume2.h>
#include <Protocol/LoadedImage.h>
#include <Protocol/LoadFile2.h>
#include <Protocol/LoadFile.h>
#include <Protocol/SimpleFileSystem.h>
#include <Guid/FileInfo.h>
/**
Identify the device handle from which the Image is loaded from. As this device handle is passed to
GetSectionFromFv as the identifier for a Firmware Volume, an EFI_FIRMWARE_VOLUME2_PROTOCOL
protocol instance should be located succesfully by calling gBS->HandleProtocol ().
This function locates the EFI_LOADED_IMAGE_PROTOCOL instance installed
on ImageHandle. It then returns EFI_LOADED_IMAGE_PROTOCOL.DeviceHandle.
If ImageHandle is NULL, then ASSERT ();
If failed to locate a EFI_LOADED_IMAGE_PROTOCOL on ImageHandle, then ASSERT ();
@param ImageHandle The firmware allocated handle for UEFI image.
@retval EFI_HANDLE The device handle from which the Image is loaded from.
**/
EFI_HANDLE
InternalImageHandleToFvHandle (
EFI_HANDLE ImageHandle
)
{
EFI_STATUS Status;
EFI_LOADED_IMAGE_PROTOCOL *LoadedImage;
ASSERT (ImageHandle != NULL);
Status = gBS->HandleProtocol (
(EFI_HANDLE *) ImageHandle,
&gEfiLoadedImageProtocolGuid,
(VOID **) &LoadedImage
);
ASSERT_EFI_ERROR (Status);
return LoadedImage->DeviceHandle;
}
/**
Allocate and fill a buffer from a Firmware Section identified by a Firmware File GUID name, a Firmware
Section type and instance number from the specified Firmware Volume.
This functions first locate the EFI_FIRMWARE_VOLUME2_PROTOCOL protocol instance on FvHandle in order to
carry out the Firmware Volume read operation. The function then reads the Firmware Section found sepcifed
by NameGuid, SectionType and SectionInstance.
The details of this search order is defined in description of EFI_FIRMWARE_VOLUME2_PROTOCOL.ReadSection ()
found in PI Specification.
If SectionType is EFI_SECTION_TE, EFI_SECTION_TE is used as section type to start the search. If EFI_SECTION_TE section
is not found, EFI_SECTION_PE32 will be used to try the search again. If no EFI_SECTION_PE32 section is found, EFI_NOT_FOUND
is returned.
The data and size is returned by Buffer and Size. The caller is responsible to free the Buffer allocated
by this function. This function can be only called at TPL_NOTIFY and below.
If FvHandle is NULL, then ASSERT ();
If NameGuid is NULL, then ASSERT();
If Buffer is NULL, then ASSERT();
If Size is NULL, then ASSERT().
@param FvHandle The device handle that contains a instance of
EFI_FIRMWARE_VOLUME2_PROTOCOL instance.
@param NameGuid The GUID name of a Firmware File.
@param SectionType The Firmware Section type.
@param SectionInstance The instance number of Firmware Section to
read from starting from 0.
@param Buffer On output, Buffer contains the the data read
from the section in the Firmware File found.
@param Size On output, the size of Buffer.
@retval EFI_SUCCESS The image is found and data and size is returned.
@retval EFI_NOT_FOUND The image specified by NameGuid and SectionType
can't be found.
@retval EFI_OUT_OF_RESOURCES There were not enough resources to allocate the
output data buffer or complete the operations.
@retval EFI_DEVICE_ERROR A hardware error occurs during reading from the
Firmware Volume.
@retval EFI_ACCESS_DENIED The firmware volume containing the searched
Firmware File is configured to disallow reads.
**/
EFI_STATUS
InternalGetSectionFromFv (
IN EFI_HANDLE FvHandle,
IN CONST EFI_GUID *NameGuid,
IN EFI_SECTION_TYPE SectionType,
IN UINTN SectionInstance,
OUT VOID **Buffer,
OUT UINTN *Size
)
{
EFI_STATUS Status;
EFI_FIRMWARE_VOLUME2_PROTOCOL *Fv;
UINT32 AuthenticationStatus;
ASSERT (NameGuid != NULL);
ASSERT (Buffer != NULL);
ASSERT (Size != NULL);
ASSERT (FvHandle != NULL);
Status = gBS->HandleProtocol (
FvHandle,
&gEfiFirmwareVolume2ProtocolGuid,
(VOID **) &Fv
);
if (EFI_ERROR (Status)) {
return EFI_NOT_FOUND;
}
//
// Read desired section content in NameGuid file
//
*Buffer = NULL;
*Size = 0;
Status = Fv->ReadSection (
Fv,
NameGuid,
SectionType,
SectionInstance,
Buffer,
Size,
&AuthenticationStatus
);
if (EFI_ERROR (Status) && (SectionType == EFI_SECTION_TE)) {
//
// Try reading PE32 section, if the required section is TE type
//
*Buffer = NULL;
*Size = 0;
Status = Fv->ReadSection (
Fv,
NameGuid,
EFI_SECTION_PE32,
SectionInstance,
Buffer,
Size,
&AuthenticationStatus
);
}
return Status;
}
/**
Searches all the available firmware volumes and returns the first matching FFS section.
This function searches all the firmware volumes for FFS files with FV file type specified by FileType
The order that the firmware volumes is searched is not deterministic. For each available FV a search
is made for FFS file of type FileType. If the FV contains more than one FFS file with the same FileType,
the FileInstance instance will be the matched FFS file. For each FFS file found a search
is made for FFS sections of type SectionType. If the FFS file contains at least SectionInstance instances
of the FFS section specified by SectionType, then the SectionInstance instance is returned in Buffer.
Buffer is allocated using AllocatePool(), and the size of the allocated buffer is returned in Size.
It is the caller's responsibility to use FreePool() to free the allocated buffer.
See EFI_FIRMWARE_VOLUME2_PROTOCOL.ReadSection() for details on how sections
are retrieved from an FFS file based on SectionType and SectionInstance.
If SectionType is EFI_SECTION_TE, and the search with an FFS file fails,
the search will be retried with a section type of EFI_SECTION_PE32.
This function must be called with a TPL <= TPL_NOTIFY.
If Buffer is NULL, then ASSERT().
If Size is NULL, then ASSERT().
@param FileType Indicates the FV file type to search for within all
available FVs.
@param FileInstance Indicates which file instance within all available
FVs specified by FileType.
FileInstance starts from zero.
@param SectionType Indicates the FFS section type to search for
within the FFS file
specified by FileType with FileInstance.
@param SectionInstance Indicates which section instance within the FFS file
specified by FileType with FileInstance to retrieve.
SectionInstance starts from zero.
@param Buffer On output, a pointer to a callee allocated buffer
containing the FFS file section that was found.
Is it the caller's responsibility to free this
buffer using FreePool().
@param Size On output, a pointer to the size, in bytes, of Buffer.
@retval EFI_SUCCESS The specified FFS section was returned.
@retval EFI_NOT_FOUND The specified FFS section could not be found.
@retval EFI_OUT_OF_RESOURCES There are not enough resources available to retrieve
the matching FFS section.
@retval EFI_DEVICE_ERROR The FFS section could not be retrieves due to a
device error.
@retval EFI_ACCESS_DENIED The FFS section could not be retrieves because
the firmware volume that
contains the matching FFS section does not allow reads.
**/
EFI_STATUS
EFIAPI
GetSectionFromAnyFvByFileType (
IN EFI_FV_FILETYPE FileType,
IN UINTN FileInstance,
IN EFI_SECTION_TYPE SectionType,
IN UINTN SectionInstance,
OUT VOID **Buffer,
OUT UINTN *Size
)
{
EFI_STATUS Status;
EFI_HANDLE *HandleBuffer;
UINTN HandleCount;
UINTN IndexFv;
UINTN IndexFile;
UINTN Key;
EFI_GUID NameGuid;
EFI_FV_FILE_ATTRIBUTES Attributes;
EFI_FIRMWARE_VOLUME2_PROTOCOL *Fv;
//
// Locate all available FVs.
//
HandleBuffer = NULL;
Status = gBS->LocateHandleBuffer (
ByProtocol,
&gEfiFirmwareVolume2ProtocolGuid,
NULL,
&HandleCount,
&HandleBuffer
);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Go through FVs one by one to find the required section data.
//
for (IndexFv = 0; IndexFv < HandleCount; IndexFv++) {
Status = gBS->HandleProtocol (
HandleBuffer[IndexFv],
&gEfiFirmwareVolume2ProtocolGuid,
(VOID **)&Fv
);
if (EFI_ERROR (Status)) {
continue;
}
//
// Use Firmware Volume 2 Protocol to search for a file of type FileType in all FVs.
//
IndexFile = FileInstance + 1;
Key = 0;
do {
Status = Fv->GetNextFile (Fv, &Key, &FileType, &NameGuid, &Attributes, Size);
if (EFI_ERROR (Status)) {
break;
}
IndexFile --;
} while (IndexFile > 0);
//
// Fv File with the required FV file type is found.
// Search the section file in the found FV file.
//
if (IndexFile == 0) {
Status = InternalGetSectionFromFv (
HandleBuffer[IndexFv],
&NameGuid,
SectionType,
SectionInstance,
Buffer,
Size
);
if (!EFI_ERROR (Status)) {
goto Done;
}
}
}
//
// The required FFS section file is not found.
//
if (IndexFv == HandleCount) {
Status = EFI_NOT_FOUND;
}
Done:
if (HandleBuffer != NULL) {
FreePool(HandleBuffer);
}
return Status;
}
/**
Searches all the availables firmware volumes and returns the first matching FFS section.
This function searches all the firmware volumes for FFS files with an FFS filename specified by NameGuid.
The order that the firmware volumes is searched is not deterministic. For each FFS file found a search
is made for FFS sections of type SectionType. If the FFS file contains at least SectionInstance instances
of the FFS section specified by SectionType, then the SectionInstance instance is returned in Buffer.
Buffer is allocated using AllocatePool(), and the size of the allocated buffer is returned in Size.
It is the caller's responsibility to use FreePool() to free the allocated buffer.
See EFI_FIRMWARE_VOLUME2_PROTOCOL.ReadSection() for details on how sections
are retrieved from an FFS file based on SectionType and SectionInstance.
If SectionType is EFI_SECTION_TE, and the search with an FFS file fails,
the search will be retried with a section type of EFI_SECTION_PE32.
This function must be called with a TPL <= TPL_NOTIFY.
If NameGuid is NULL, then ASSERT().
If Buffer is NULL, then ASSERT().
If Size is NULL, then ASSERT().
@param NameGuid A pointer to to the FFS filename GUID to search for
within any of the firmware volumes in the platform.
@param SectionType Indicates the FFS section type to search for within
the FFS file specified by NameGuid.
@param SectionInstance Indicates which section instance within the FFS file
specified by NameGuid to retrieve.
@param Buffer On output, a pointer to a callee allocated buffer
containing the FFS file section that was found.
Is it the caller's responsibility to free this buffer
using FreePool().
@param Size On output, a pointer to the size, in bytes, of Buffer.
@retval EFI_SUCCESS The specified FFS section was returned.
@retval EFI_NOT_FOUND The specified FFS section could not be found.
@retval EFI_OUT_OF_RESOURCES There are not enough resources available to
retrieve the matching FFS section.
@retval EFI_DEVICE_ERROR The FFS section could not be retrieves due to a
device error.
@retval EFI_ACCESS_DENIED The FFS section could not be retrieves because the
firmware volume that
contains the matching FFS section does not allow reads.
**/
EFI_STATUS
EFIAPI
GetSectionFromAnyFv (
IN CONST EFI_GUID *NameGuid,
IN EFI_SECTION_TYPE SectionType,
IN UINTN SectionInstance,
OUT VOID **Buffer,
OUT UINTN *Size
)
{
EFI_STATUS Status;
EFI_HANDLE *HandleBuffer;
UINTN HandleCount;
UINTN Index;
EFI_HANDLE FvHandle;
//
// Search the FV that contain the caller's FFS first.
// FV builder can choose to build FFS into the this FV
// so that this implementation of GetSectionFromAnyFv
// will locate the FFS faster.
//
FvHandle = InternalImageHandleToFvHandle (gImageHandle);
Status = InternalGetSectionFromFv (
FvHandle,
NameGuid,
SectionType,
SectionInstance,
Buffer,
Size
);
if (!EFI_ERROR (Status)) {
return EFI_SUCCESS;
}
HandleBuffer = NULL;
Status = gBS->LocateHandleBuffer (
ByProtocol,
&gEfiFirmwareVolume2ProtocolGuid,
NULL,
&HandleCount,
&HandleBuffer
);
if (EFI_ERROR (Status)) {
goto Done;
}
for (Index = 0; Index < HandleCount; Index++) {
//
// Skip the FV that contain the caller's FFS
//
if (HandleBuffer[Index] != FvHandle) {
Status = InternalGetSectionFromFv (
HandleBuffer[Index],
NameGuid,
SectionType,
SectionInstance,
Buffer,
Size
);
if (!EFI_ERROR (Status)) {
goto Done;
}
}
}
if (Index == HandleCount) {
Status = EFI_NOT_FOUND;
}
Done:
if (HandleBuffer != NULL) {
FreePool(HandleBuffer);
}
return Status;
}
/**
Searches the firmware volume that the currently executing module was loaded from and returns the first matching FFS section.
This function searches the firmware volume that the currently executing module was loaded
from for an FFS file with an FFS filename specified by NameGuid. If the FFS file is found a search
is made for FFS sections of type SectionType. If the FFS file contains at least SectionInstance
instances of the FFS section specified by SectionType, then the SectionInstance instance is returned in Buffer.
Buffer is allocated using AllocatePool(), and the size of the allocated buffer is returned in Size.
It is the caller's responsibility to use FreePool() to free the allocated buffer.
See EFI_FIRMWARE_VOLUME2_PROTOCOL.ReadSection() for details on how sections are retrieved from
an FFS file based on SectionType and SectionInstance.
If the currently executing module was not loaded from a firmware volume, then EFI_NOT_FOUND is returned.
If SectionType is EFI_SECTION_TE, and the search with an FFS file fails,
the search will be retried with a section type of EFI_SECTION_PE32.
This function must be called with a TPL <= TPL_NOTIFY.
If NameGuid is NULL, then ASSERT().
If Buffer is NULL, then ASSERT().
If Size is NULL, then ASSERT().
@param NameGuid A pointer to to the FFS filename GUID to search for
within the firmware volumes that the currently
executing module was loaded from.
@param SectionType Indicates the FFS section type to search for within
the FFS file specified by NameGuid.
@param SectionInstance Indicates which section instance within the FFS file
specified by NameGuid to retrieve.
@param Buffer On output, a pointer to a callee allocated buffer
containing the FFS file section that was found.
Is it the caller's responsibility to free this buffer
using FreePool().
@param Size On output, a pointer to the size, in bytes, of Buffer.
@retval EFI_SUCCESS The specified FFS section was returned.
@retval EFI_NOT_FOUND The specified FFS section could not be found.
@retval EFI_OUT_OF_RESOURCES There are not enough resources available to retrieve
the matching FFS section.
@retval EFI_DEVICE_ERROR The FFS section could not be retrieves due to a
device error.
@retval EFI_ACCESS_DENIED The FFS section could not be retrieves because the
firmware volume that contains the matching FFS
section does not allow reads.
**/
EFI_STATUS
EFIAPI
GetSectionFromFv (
IN CONST EFI_GUID *NameGuid,
IN EFI_SECTION_TYPE SectionType,
IN UINTN SectionInstance,
OUT VOID **Buffer,
OUT UINTN *Size
)
{
return InternalGetSectionFromFv (
InternalImageHandleToFvHandle(gImageHandle),
NameGuid,
SectionType,
SectionInstance,
Buffer,
Size
);
}
/**
Searches the FFS file the the currently executing module was loaded from and returns the first matching FFS section.
This function searches the FFS file that the currently executing module was loaded from for a FFS sections of type SectionType.
If the FFS file contains at least SectionInstance instances of the FFS section specified by SectionType,
then the SectionInstance instance is returned in Buffer. Buffer is allocated using AllocatePool(),
and the size of the allocated buffer is returned in Size. It is the caller's responsibility
to use FreePool() to free the allocated buffer. See EFI_FIRMWARE_VOLUME2_PROTOCOL.ReadSection() for
details on how sections are retrieved from an FFS file based on SectionType and SectionInstance.
If the currently executing module was not loaded from an FFS file, then EFI_NOT_FOUND is returned.
If SectionType is EFI_SECTION_TE, and the search with an FFS file fails,
the search will be retried with a section type of EFI_SECTION_PE32.
This function must be called with a TPL <= TPL_NOTIFY.
If Buffer is NULL, then ASSERT().
If Size is NULL, then ASSERT().
@param SectionType Indicates the FFS section type to search for within
the FFS file that the currently executing module
was loaded from.
@param SectionInstance Indicates which section instance to retrieve within
the FFS file that the currently executing module
was loaded from.
@param Buffer On output, a pointer to a callee allocated buffer
containing the FFS file section that was found.
Is it the caller's responsibility to free this buffer
using FreePool().
@param Size On output, a pointer to the size, in bytes, of Buffer.
@retval EFI_SUCCESS The specified FFS section was returned.
@retval EFI_NOT_FOUND The specified FFS section could not be found.
@retval EFI_OUT_OF_RESOURCES There are not enough resources available to retrieve
the matching FFS section.
@retval EFI_DEVICE_ERROR The FFS section could not be retrieves due to a
device error.
@retval EFI_ACCESS_DENIED The FFS section could not be retrieves because the
firmware volume that contains the matching FFS
section does not allow reads.
**/
EFI_STATUS
EFIAPI
GetSectionFromFfs (
IN EFI_SECTION_TYPE SectionType,
IN UINTN SectionInstance,
OUT VOID **Buffer,
OUT UINTN *Size
)
{
return InternalGetSectionFromFv(
InternalImageHandleToFvHandle(gImageHandle),
&gEfiCallerIdGuid,
SectionType,
SectionInstance,
Buffer,
Size
);
}
/**
Get the image file buffer data and buffer size by its device path.
Access the file either from a firmware volume, from a file system interface,
or from the load file interface.
Allocate memory to store the found image. The caller is responsible to free memory.
If FilePath is NULL, then NULL is returned.
If FileSize is NULL, then NULL is returned.
If AuthenticationStatus is NULL, then NULL is returned.
@param[in] BootPolicy Policy for Open Image File.If TRUE, indicates
that the request originates from the boot
manager, and that the boot manager is
attempting to load FilePath as a boot
selection. If FALSE, then FilePath must
match an exact file to be loaded.
@param[in] FilePath The pointer to the device path of the file
that is absracted to the file buffer.
@param[out] FileSize The pointer to the size of the abstracted
file buffer.
@param[out] AuthenticationStatus Pointer to the authentication status.
@retval NULL FilePath is NULL, or FileSize is NULL, or AuthenticationStatus is NULL, or the file can't be found.
@retval other The abstracted file buffer. The caller is responsible to free memory.
**/
VOID *
EFIAPI
GetFileBufferByFilePath (
IN BOOLEAN BootPolicy,
IN CONST EFI_DEVICE_PATH_PROTOCOL *FilePath,
OUT UINTN *FileSize,
OUT UINT32 *AuthenticationStatus
)
{
EFI_DEVICE_PATH_PROTOCOL *DevicePathNode;
EFI_DEVICE_PATH_PROTOCOL *OrigDevicePathNode;
EFI_DEVICE_PATH_PROTOCOL *TempDevicePathNode;
EFI_HANDLE Handle;
EFI_GUID *FvNameGuid;
EFI_FIRMWARE_VOLUME2_PROTOCOL *FwVol;
EFI_SECTION_TYPE SectionType;
UINT8 *ImageBuffer;
UINTN ImageBufferSize;
EFI_FV_FILETYPE Type;
EFI_FV_FILE_ATTRIBUTES Attrib;
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *Volume;
EFI_FILE_HANDLE FileHandle;
EFI_FILE_HANDLE LastHandle;
EFI_FILE_INFO *FileInfo;
UINTN FileInfoSize;
EFI_LOAD_FILE_PROTOCOL *LoadFile;
EFI_LOAD_FILE2_PROTOCOL *LoadFile2;
EFI_STATUS Status;
//
// Check input File device path.
//
if (FilePath == NULL || FileSize == NULL || AuthenticationStatus == NULL) {
return NULL;
}
//
// Init local variable
//
TempDevicePathNode = NULL;
FvNameGuid = NULL;
FileInfo = NULL;
FileHandle = NULL;
ImageBuffer = NULL;
ImageBufferSize = 0;
*AuthenticationStatus = 0;
//
// Copy File Device Path
//
OrigDevicePathNode = DuplicateDevicePath (FilePath);
if (OrigDevicePathNode == NULL) {
return NULL;
}
//
// Check whether this device path support FV2 protocol.
// Is so, this device path may contain a Image.
//
DevicePathNode = OrigDevicePathNode;
Status = gBS->LocateDevicePath (&gEfiFirmwareVolume2ProtocolGuid, &DevicePathNode, &Handle);
if (!EFI_ERROR (Status)) {
//
// For FwVol File system there is only a single file name that is a GUID.
//
FvNameGuid = EfiGetNameGuidFromFwVolDevicePathNode ((CONST MEDIA_FW_VOL_FILEPATH_DEVICE_PATH *) DevicePathNode);
if (FvNameGuid == NULL) {
Status = EFI_INVALID_PARAMETER;
} else {
//
// Read image from the firmware file
//
Status = gBS->HandleProtocol (Handle, &gEfiFirmwareVolume2ProtocolGuid, (VOID**)&FwVol);
if (!EFI_ERROR (Status)) {
SectionType = EFI_SECTION_PE32;
ImageBuffer = NULL;
Status = FwVol->ReadSection (
FwVol,
FvNameGuid,
SectionType,
0,
(VOID **)&ImageBuffer,
&ImageBufferSize,
AuthenticationStatus
);
if (EFI_ERROR (Status)) {
//
// Try a raw file, since a PE32 SECTION does not exist
//
if (ImageBuffer != NULL) {
FreePool (ImageBuffer);
*AuthenticationStatus = 0;
}
ImageBuffer = NULL;
Status = FwVol->ReadFile (
FwVol,
FvNameGuid,
(VOID **)&ImageBuffer,
&ImageBufferSize,
&Type,
&Attrib,
AuthenticationStatus
);
}
}
}
if (!EFI_ERROR (Status)) {
goto Finish;
}
}
//
// Attempt to access the file via a file system interface
//
DevicePathNode = OrigDevicePathNode;
Status = gBS->LocateDevicePath (&gEfiSimpleFileSystemProtocolGuid, &DevicePathNode, &Handle);
if (!EFI_ERROR (Status)) {
Status = gBS->HandleProtocol (Handle, &gEfiSimpleFileSystemProtocolGuid, (VOID**)&Volume);
if (!EFI_ERROR (Status)) {
//
// Open the Volume to get the File System handle
//
Status = Volume->OpenVolume (Volume, &FileHandle);
if (!EFI_ERROR (Status)) {
//
// Duplicate the device path to avoid the access to unaligned device path node.
// Because the device path consists of one or more FILE PATH MEDIA DEVICE PATH
// nodes, It assures the fields in device path nodes are 2 byte aligned.
//
TempDevicePathNode = DuplicateDevicePath (DevicePathNode);
if (TempDevicePathNode == NULL) {
FileHandle->Close (FileHandle);
//
// Setting Status to an EFI_ERROR value will cause the rest of
// the file system support below to be skipped.
//
Status = EFI_OUT_OF_RESOURCES;
}
//
// Parse each MEDIA_FILEPATH_DP node. There may be more than one, since the
// directory information and filename can be seperate. The goal is to inch
// our way down each device path node and close the previous node
//
DevicePathNode = TempDevicePathNode;
while (!EFI_ERROR (Status) && !IsDevicePathEnd (DevicePathNode)) {
if (DevicePathType (DevicePathNode) != MEDIA_DEVICE_PATH ||
DevicePathSubType (DevicePathNode) != MEDIA_FILEPATH_DP) {
Status = EFI_UNSUPPORTED;
break;
}
LastHandle = FileHandle;
FileHandle = NULL;
Status = LastHandle->Open (
LastHandle,
&FileHandle,
((FILEPATH_DEVICE_PATH *) DevicePathNode)->PathName,
EFI_FILE_MODE_READ,
0
);
//
// Close the previous node
//
LastHandle->Close (LastHandle);
DevicePathNode = NextDevicePathNode (DevicePathNode);
}
if (!EFI_ERROR (Status)) {
//
// We have found the file. Now we need to read it. Before we can read the file we need to
// figure out how big the file is.
//
FileInfo = NULL;
FileInfoSize = 0;
Status = FileHandle->GetInfo (
FileHandle,
&gEfiFileInfoGuid,
&FileInfoSize,
FileInfo
);
if (Status == EFI_BUFFER_TOO_SMALL) {
FileInfo = AllocatePool (FileInfoSize);
if (FileInfo == NULL) {
Status = EFI_OUT_OF_RESOURCES;
} else {
Status = FileHandle->GetInfo (
FileHandle,
&gEfiFileInfoGuid,
&FileInfoSize,
FileInfo
);
}
}
if (!EFI_ERROR (Status) && (FileInfo != NULL)) {
if ((FileInfo->Attribute & EFI_FILE_DIRECTORY) == 0) {
//
// Allocate space for the file
//
ImageBuffer = AllocatePool ((UINTN)FileInfo->FileSize);
if (ImageBuffer == NULL) {
Status = EFI_OUT_OF_RESOURCES;
} else {
//
// Read the file into the buffer we allocated
//
ImageBufferSize = (UINTN)FileInfo->FileSize;
Status = FileHandle->Read (FileHandle, &ImageBufferSize, ImageBuffer);
}
}
}
}
//
// Close the file and Free FileInfo and TempDevicePathNode since we are done
//
if (FileInfo != NULL) {
FreePool (FileInfo);
}
if (FileHandle != NULL) {
FileHandle->Close (FileHandle);
}
if (TempDevicePathNode != NULL) {
FreePool (TempDevicePathNode);
}
}
}
if (!EFI_ERROR (Status)) {
goto Finish;
}
}
//
// Attempt to access the file via LoadFile2 interface
//
if (!BootPolicy) {
DevicePathNode = OrigDevicePathNode;
Status = gBS->LocateDevicePath (&gEfiLoadFile2ProtocolGuid, &DevicePathNode, &Handle);
if (!EFI_ERROR (Status)) {
Status = gBS->HandleProtocol (Handle, &gEfiLoadFile2ProtocolGuid, (VOID**)&LoadFile2);
if (!EFI_ERROR (Status)) {
//
// Call LoadFile2 with the correct buffer size
//
ImageBufferSize = 0;
ImageBuffer = NULL;
Status = LoadFile2->LoadFile (
LoadFile2,
DevicePathNode,
FALSE,
&ImageBufferSize,
ImageBuffer
);
if (Status == EFI_BUFFER_TOO_SMALL) {
ImageBuffer = AllocatePool (ImageBufferSize);
if (ImageBuffer == NULL) {
Status = EFI_OUT_OF_RESOURCES;
} else {
Status = LoadFile2->LoadFile (
LoadFile2,
DevicePathNode,
FALSE,
&ImageBufferSize,
ImageBuffer
);
}
}
}
if (!EFI_ERROR (Status)) {
goto Finish;
}
}
}
//
// Attempt to access the file via LoadFile interface
//
DevicePathNode = OrigDevicePathNode;
Status = gBS->LocateDevicePath (&gEfiLoadFileProtocolGuid, &DevicePathNode, &Handle);
if (!EFI_ERROR (Status)) {
Status = gBS->HandleProtocol (Handle, &gEfiLoadFileProtocolGuid, (VOID**)&LoadFile);
if (!EFI_ERROR (Status)) {
//
// Call LoadFile with the correct buffer size
//
ImageBufferSize = 0;
ImageBuffer = NULL;
Status = LoadFile->LoadFile (
LoadFile,
DevicePathNode,
BootPolicy,
&ImageBufferSize,
ImageBuffer
);
if (Status == EFI_BUFFER_TOO_SMALL) {
ImageBuffer = AllocatePool (ImageBufferSize);
if (ImageBuffer == NULL) {
Status = EFI_OUT_OF_RESOURCES;
} else {
Status = LoadFile->LoadFile (
LoadFile,
DevicePathNode,
BootPolicy,
&ImageBufferSize,
ImageBuffer
);
}
}
}
}
Finish:
if (EFI_ERROR (Status)) {
if (ImageBuffer != NULL) {
FreePool (ImageBuffer);
ImageBuffer = NULL;
}
*FileSize = 0;
} else {
*FileSize = ImageBufferSize;
}
FreePool (OrigDevicePathNode);
return ImageBuffer;
}
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