diff options
| -rw-r--r-- | IntelFrameworkPkg/Library/FrameworkUefiLib/FrameworkUefiLib.inf | 1 | ||||
| -rw-r--r-- | IntelFrameworkPkg/Library/FrameworkUefiLib/UefiLib.c | 227 |
2 files changed, 228 insertions, 0 deletions
diff --git a/IntelFrameworkPkg/Library/FrameworkUefiLib/FrameworkUefiLib.inf b/IntelFrameworkPkg/Library/FrameworkUefiLib/FrameworkUefiLib.inf index 8cff19fa31..182d20fca0 100644 --- a/IntelFrameworkPkg/Library/FrameworkUefiLib/FrameworkUefiLib.inf +++ b/IntelFrameworkPkg/Library/FrameworkUefiLib/FrameworkUefiLib.inf @@ -61,6 +61,7 @@ gEfiSimpleTextOutProtocolGuid ## SOMETIMES_CONSUMES
gEfiGraphicsOutputProtocolGuid ## SOMETIMES_CONSUMES
gEfiHiiFontProtocolGuid ## SOMETIMES_CONSUMES
+ gEfiSimpleFileSystemProtocolGuid ## SOMETIMES_CONSUMES
gEfiComponentNameProtocolGuid ## SOMETIMES_PRODUCES
gEfiComponentName2ProtocolGuid ## SOMETIMES_PRODUCES
gEfiDriverConfigurationProtocolGuid ## SOMETIMES_PRODUCES
diff --git a/IntelFrameworkPkg/Library/FrameworkUefiLib/UefiLib.c b/IntelFrameworkPkg/Library/FrameworkUefiLib/UefiLib.c index 0aa4506b8f..b283d775b4 100644 --- a/IntelFrameworkPkg/Library/FrameworkUefiLib/UefiLib.c +++ b/IntelFrameworkPkg/Library/FrameworkUefiLib/UefiLib.c @@ -1691,3 +1691,230 @@ EfiLocateProtocolBuffer ( return EFI_SUCCESS;
}
+
+/**
+ Open or create a file or directory, possibly creating the chain of
+ directories leading up to the directory.
+
+ EfiOpenFileByDevicePath() first locates EFI_SIMPLE_FILE_SYSTEM_PROTOCOL on
+ FilePath, and opens the root directory of that filesystem with
+ EFI_SIMPLE_FILE_SYSTEM_PROTOCOL.OpenVolume().
+
+ On the remaining device path, the longest initial sequence of
+ FILEPATH_DEVICE_PATH nodes is node-wise traversed with
+ EFI_FILE_PROTOCOL.Open(). For the pathname fragment specified by each
+ traversed FILEPATH_DEVICE_PATH node, EfiOpenFileByDevicePath() first masks
+ EFI_FILE_MODE_CREATE out of OpenMode, and passes 0 for Attributes. If
+ EFI_FILE_PROTOCOL.Open() fails, and OpenMode includes EFI_FILE_MODE_CREATE,
+ then the operation is retried with the caller's OpenMode and Attributes
+ unmodified.
+
+ (As a consequence, if OpenMode includes EFI_FILE_MODE_CREATE, and Attributes
+ includes EFI_FILE_DIRECTORY, and each FILEPATH_DEVICE_PATH specifies a single
+ pathname component, then EfiOpenFileByDevicePath() ensures that the specified
+ series of subdirectories exist on return.)
+
+ The EFI_FILE_PROTOCOL identified by the last FILEPATH_DEVICE_PATH node is
+ output to the caller; intermediate EFI_FILE_PROTOCOL instances are closed. If
+ there are no FILEPATH_DEVICE_PATH nodes past the node that identifies the
+ filesystem, then the EFI_FILE_PROTOCOL of the root directory of the
+ filesystem is output to the caller. If a device path node that is different
+ from FILEPATH_DEVICE_PATH is encountered relative to the filesystem, the
+ traversal is stopped with an error, and a NULL EFI_FILE_PROTOCOL is output.
+
+ @param[in,out] FilePath On input, the device path to the file or directory
+ to open or create. The caller is responsible for
+ ensuring that the device path pointed-to by FilePath
+ is well-formed. On output, FilePath points one past
+ the last node in the original device path that has
+ been successfully processed. FilePath is set on
+ output even if EfiOpenFileByDevicePath() returns an
+ error.
+
+ @param[out] File On error, File is set to NULL. On success, File is
+ set to the EFI_FILE_PROTOCOL of the root directory
+ of the filesystem, if there are no
+ FILEPATH_DEVICE_PATH nodes in FilePath; otherwise,
+ File is set to the EFI_FILE_PROTOCOL identified by
+ the last node in FilePath.
+
+ @param[in] OpenMode The OpenMode parameter to pass to
+ EFI_FILE_PROTOCOL.Open(). For each
+ FILEPATH_DEVICE_PATH node in FilePath,
+ EfiOpenFileByDevicePath() first opens the specified
+ pathname fragment with EFI_FILE_MODE_CREATE masked
+ out of OpenMode and with Attributes set to 0, and
+ only retries the operation with EFI_FILE_MODE_CREATE
+ unmasked and Attributes propagated if the first open
+ attempt fails.
+
+ @param[in] Attributes The Attributes parameter to pass to
+ EFI_FILE_PROTOCOL.Open(), when EFI_FILE_MODE_CREATE
+ is propagated unmasked in OpenMode.
+
+ @retval EFI_SUCCESS The file or directory has been opened or
+ created.
+
+ @retval EFI_INVALID_PARAMETER FilePath is NULL; or File is NULL; or FilePath
+ contains a device path node, past the node
+ that identifies
+ EFI_SIMPLE_FILE_SYSTEM_PROTOCOL, that is not a
+ FILEPATH_DEVICE_PATH node.
+
+ @retval EFI_OUT_OF_RESOURCES Memory allocation failed.
+
+ @return Error codes propagated from the
+ LocateDevicePath() and OpenProtocol() boot
+ services, and from the
+ EFI_SIMPLE_FILE_SYSTEM_PROTOCOL.OpenVolume()
+ and EFI_FILE_PROTOCOL.Open() member functions.
+**/
+EFI_STATUS
+EFIAPI
+EfiOpenFileByDevicePath (
+ IN OUT EFI_DEVICE_PATH_PROTOCOL **FilePath,
+ OUT EFI_FILE_PROTOCOL **File,
+ IN UINT64 OpenMode,
+ IN UINT64 Attributes
+ )
+{
+ EFI_STATUS Status;
+ EFI_HANDLE FileSystemHandle;
+ EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *FileSystem;
+ EFI_FILE_PROTOCOL *LastFile;
+ FILEPATH_DEVICE_PATH *FilePathNode;
+ CHAR16 *AlignedPathName;
+ CHAR16 *PathName;
+ EFI_FILE_PROTOCOL *NextFile;
+
+ if (File == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+ *File = NULL;
+
+ if (FilePath == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ //
+ // Look up the filesystem.
+ //
+ Status = gBS->LocateDevicePath (
+ &gEfiSimpleFileSystemProtocolGuid,
+ FilePath,
+ &FileSystemHandle
+ );
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+ Status = gBS->OpenProtocol (
+ FileSystemHandle,
+ &gEfiSimpleFileSystemProtocolGuid,
+ (VOID **)&FileSystem,
+ gImageHandle,
+ NULL,
+ EFI_OPEN_PROTOCOL_GET_PROTOCOL
+ );
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ //
+ // Open the root directory of the filesystem. After this operation succeeds,
+ // we have to release LastFile on error.
+ //
+ Status = FileSystem->OpenVolume (FileSystem, &LastFile);
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ //
+ // Traverse the device path nodes relative to the filesystem.
+ //
+ while (!IsDevicePathEnd (*FilePath)) {
+ if (DevicePathType (*FilePath) != MEDIA_DEVICE_PATH ||
+ DevicePathSubType (*FilePath) != MEDIA_FILEPATH_DP) {
+ Status = EFI_INVALID_PARAMETER;
+ goto CloseLastFile;
+ }
+ FilePathNode = (FILEPATH_DEVICE_PATH *)*FilePath;
+
+ //
+ // FilePathNode->PathName may be unaligned, and the UEFI specification
+ // requires pointers that are passed to protocol member functions to be
+ // aligned. Create an aligned copy of the pathname if necessary.
+ //
+ if ((UINTN)FilePathNode->PathName % sizeof *FilePathNode->PathName == 0) {
+ AlignedPathName = NULL;
+ PathName = FilePathNode->PathName;
+ } else {
+ AlignedPathName = AllocateCopyPool (
+ (DevicePathNodeLength (FilePathNode) -
+ SIZE_OF_FILEPATH_DEVICE_PATH),
+ FilePathNode->PathName
+ );
+ if (AlignedPathName == NULL) {
+ Status = EFI_OUT_OF_RESOURCES;
+ goto CloseLastFile;
+ }
+ PathName = AlignedPathName;
+ }
+
+ //
+ // Open the next pathname fragment with EFI_FILE_MODE_CREATE masked out and
+ // with Attributes set to 0.
+ //
+ Status = LastFile->Open (
+ LastFile,
+ &NextFile,
+ PathName,
+ OpenMode & ~(UINT64)EFI_FILE_MODE_CREATE,
+ 0
+ );
+
+ //
+ // Retry with EFI_FILE_MODE_CREATE and the original Attributes if the first
+ // attempt failed, and the caller specified EFI_FILE_MODE_CREATE.
+ //
+ if (EFI_ERROR (Status) && (OpenMode & EFI_FILE_MODE_CREATE) != 0) {
+ Status = LastFile->Open (
+ LastFile,
+ &NextFile,
+ PathName,
+ OpenMode,
+ Attributes
+ );
+ }
+
+ //
+ // Release any AlignedPathName on both error and success paths; PathName is
+ // no longer needed.
+ //
+ if (AlignedPathName != NULL) {
+ FreePool (AlignedPathName);
+ }
+ if (EFI_ERROR (Status)) {
+ goto CloseLastFile;
+ }
+
+ //
+ // Advance to the next device path node.
+ //
+ LastFile->Close (LastFile);
+ LastFile = NextFile;
+ *FilePath = NextDevicePathNode (FilePathNode);
+ }
+
+ *File = LastFile;
+ return EFI_SUCCESS;
+
+CloseLastFile:
+ LastFile->Close (LastFile);
+
+ //
+ // We are on the error path; we must have set an error Status for returning
+ // to the caller.
+ //
+ ASSERT (EFI_ERROR (Status));
+ return Status;
+}
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