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Diffstat (limited to 'OldMdePkg/Library/UefiDevicePathLibDevicePathProtocol/UefiDevicePathLib.c')
| -rw-r--r-- | OldMdePkg/Library/UefiDevicePathLibDevicePathProtocol/UefiDevicePathLib.c | 348 |
1 files changed, 348 insertions, 0 deletions
diff --git a/OldMdePkg/Library/UefiDevicePathLibDevicePathProtocol/UefiDevicePathLib.c b/OldMdePkg/Library/UefiDevicePathLibDevicePathProtocol/UefiDevicePathLib.c new file mode 100644 index 0000000000..ec9b4aa321 --- /dev/null +++ b/OldMdePkg/Library/UefiDevicePathLibDevicePathProtocol/UefiDevicePathLib.c @@ -0,0 +1,348 @@ +/** @file
+ UEFI Device Path Library.
+
+ Copyright (c) 2006, Intel Corporation<BR>
+ 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.
+
+ Module Name: UefiDevicePathLib.c
+
+**/
+
+STATIC EFI_DEVICE_PATH_UTILITIES_PROTOCOL *mDevicePathUtilities = NULL;
+
+/**
+ The constructor function caches the pointer to DevicePathUtilites protocol.
+
+ The constructor function locates DevicePathUtilities protocol from protocol database.
+ It will ASSERT() if that operation fails and it will always return EFI_SUCCESS.
+
+ @param ImageHandle The firmware allocated handle for the EFI image.
+ @param SystemTable A pointer to the EFI System Table.
+
+ @retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
+
+**/
+EFI_STATUS
+EFIAPI
+DevicePathLibConstructor (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ EFI_STATUS Status;
+
+ Status = gBS->LocateProtocol (
+ &gEfiDevicePathUtilitiesProtocolGuid,
+ NULL,
+ (VOID**) &mDevicePathUtilities
+ );
+ ASSERT_EFI_ERROR (Status);
+ ASSERT (mDevicePathUtilities != NULL);
+
+ return Status;
+}
+
+/**
+ Returns the size of a device path in bytes.
+
+ This function returns the size, in bytes, of the device path data structure specified by
+ DevicePath including the end of device path node. If DevicePath is NULL, then 0 is returned.
+
+ @param DevicePath A pointer to a device path data structure.
+
+ @return The size of a device path in bytes.
+
+**/
+UINTN
+EFIAPI
+GetDevicePathSize (
+ IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
+ )
+{
+ return mDevicePathUtilities->GetDevicePathSize (DevicePath);
+}
+
+/**
+ Creates a new device path by appending a second device path to a first device path.
+
+ This function allocates space for a new copy of the device path specified by DevicePath. If
+ DevicePath is NULL, then NULL is returned. If the memory is successfully allocated, then the
+ contents of DevicePath are copied to the newly allocated buffer, and a pointer to that buffer
+ is returned. Otherwise, NULL is returned.
+
+ @param DevicePath A pointer to a device path data structure.
+
+ @return A pointer to the duplicated device path.
+
+**/
+EFI_DEVICE_PATH_PROTOCOL *
+EFIAPI
+DuplicateDevicePath (
+ IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
+ )
+{
+ return mDevicePathUtilities->DuplicateDevicePath (DevicePath);
+}
+
+/**
+ Creates a new device path by appending a second device path to a first device path.
+
+ This function creates a new device path by appending a copy of SecondDevicePath to a copy of
+ FirstDevicePath in a newly allocated buffer. Only the end-of-device-path device node from
+ SecondDevicePath is retained. The newly created device path is returned.
+ If FirstDevicePath is NULL, then it is ignored, and a duplicate of SecondDevicePath is returned.
+ If SecondDevicePath is NULL, then it is ignored, and a duplicate of FirstDevicePath is returned.
+ If both FirstDevicePath and SecondDevicePath are NULL, then NULL is returned.
+ If there is not enough memory for the newly allocated buffer, then NULL is returned.
+ The memory for the new device path is allocated from EFI boot services memory. It is the
+ responsibility of the caller to free the memory allocated.
+
+ @param FirstDevicePath A pointer to a device path data structure.
+ @param SecondDevicePath A pointer to a device path data structure.
+
+ @return A pointer to the new device path.
+
+**/
+EFI_DEVICE_PATH_PROTOCOL *
+EFIAPI
+AppendDevicePath (
+ IN CONST EFI_DEVICE_PATH_PROTOCOL *FirstDevicePath, OPTIONAL
+ IN CONST EFI_DEVICE_PATH_PROTOCOL *SecondDevicePath OPTIONAL
+ )
+{
+ return mDevicePathUtilities->AppendDevicePath (FirstDevicePath, SecondDevicePath);
+}
+
+/**
+ Creates a new path by appending the device node to the device path.
+
+ This function creates a new device path by appending a copy of the device node specified by
+ DevicePathNode to a copy of the device path specified by DevicePath in an allocated buffer.
+ The end-of-device-path device node is moved after the end of the appended device node.
+ If DevicePath is NULL, then NULL is returned.
+ If DevicePathNode is NULL, then NULL is returned.
+ If there is not enough memory to allocate space for the new device path, then NULL is returned.
+ The memory is allocated from EFI boot services memory. It is the responsibility of the caller to
+ free the memory allocated.
+
+ @param DevicePath A pointer to a device path data structure.
+ @param DevicePathNode A pointer to a single device path node.
+
+ @return A pointer to the new device path.
+
+**/
+EFI_DEVICE_PATH_PROTOCOL *
+EFIAPI
+AppendDevicePathNode (
+ IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath, OPTIONAL
+ IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePathNode OPTIONAL
+ )
+{
+ return mDevicePathUtilities->AppendDeviceNode (DevicePath, DevicePathNode);
+}
+
+/**
+ Creates a new device path by appending the specified device path instance to the specified device
+ path.
+
+ This function creates a new device path by appending a copy of the device path instance specified
+ by DevicePathInstance to a copy of the device path secified by DevicePath in a allocated buffer.
+ The end-of-device-path device node is moved after the end of the appended device path instance
+ and a new end-of-device-path-instance node is inserted between.
+ If DevicePath is NULL, then a copy if DevicePathInstance is returned.
+ If DevicePathInstance is NULL, then NULL is returned.
+ If there is not enough memory to allocate space for the new device path, then NULL is returned.
+ The memory is allocated from EFI boot services memory. It is the responsibility of the caller to
+ free the memory allocated.
+
+ @param DevicePath A pointer to a device path data structure.
+ @param DevicePathInstance A pointer to a device path instance.
+
+ @return A pointer to the new device path.
+
+**/
+EFI_DEVICE_PATH_PROTOCOL *
+EFIAPI
+AppendDevicePathInstance (
+ IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath, OPTIONAL
+ IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePathInstance OPTIONAL
+ )
+{
+ return mDevicePathUtilities->AppendDevicePathInstance (DevicePath, DevicePathInstance);
+}
+
+/**
+ Creates a copy of the current device path instance and returns a pointer to the next device path
+ instance.
+
+ This function creates a copy of the current device path instance. It also updates DevicePath to
+ point to the next device path instance in the device path (or NULL if no more) and updates Size
+ to hold the size of the device path instance copy.
+ If DevicePath is NULL, then NULL is returned.
+ If there is not enough memory to allocate space for the new device path, then NULL is returned.
+ The memory is allocated from EFI boot services memory. It is the responsibility of the caller to
+ free the memory allocated.
+ If Size is NULL, then ASSERT().
+
+ @param DevicePath On input, this holds the pointer to the current device path
+ instance. On output, this holds the pointer to the next device
+ path instance or NULL if there are no more device path
+ instances in the device path pointer to a device path data
+ structure.
+ @param Size On output, this holds the size of the device path instance, in
+ bytes or zero, if DevicePath is NULL.
+
+ @return A pointer to the current device path instance.
+
+**/
+EFI_DEVICE_PATH_PROTOCOL *
+EFIAPI
+GetNextDevicePathInstance (
+ IN OUT EFI_DEVICE_PATH_PROTOCOL **DevicePath,
+ OUT UINTN *Size
+ )
+{
+ ASSERT (Size != NULL);
+ return mDevicePathUtilities->GetNextDevicePathInstance (DevicePath, Size);
+}
+
+/**
+ Creates a copy of the current device path instance and returns a pointer to the next device path
+ instance.
+
+ This function creates a new device node in a newly allocated buffer of size NodeLength and
+ initializes the device path node header with NodeType and NodeSubType. The new device path node
+ is returned.
+ If NodeLength is smaller than a device path header, then NULL is returned.
+ If there is not enough memory to allocate space for the new device path, then NULL is returned.
+ The memory is allocated from EFI boot services memory. It is the responsibility of the caller to
+ free the memory allocated.
+
+ @param NodeType The device node type for the new device node.
+ @param NodeSubType The device node sub-type for the new device node.
+ @param NodeLength The length of the new device node.
+
+ @return The new device path.
+
+**/
+EFI_DEVICE_PATH_PROTOCOL *
+EFIAPI
+CreateDeviceNode (
+ IN UINT8 NodeType,
+ IN UINT8 NodeSubType,
+ IN UINT16 NodeLength
+ )
+{
+ return mDevicePathUtilities->CreateDeviceNode (NodeType, NodeSubType, NodeLength);
+}
+
+/**
+ Determines if a device path is single or multi-instance.
+
+ This function returns TRUE if the device path specified by DevicePath is multi-instance.
+ Otherwise, FALSE is returned. If DevicePath is NULL, then FALSE is returned.
+
+ @param DevicePath A pointer to a device path data structure.
+
+ @retval TRUE DevicePath is multi-instance.
+ @retval FALSE DevicePath is not multi-instance or DevicePath is NULL.
+
+**/
+BOOLEAN
+EFIAPI
+IsDevicePathMultiInstance (
+ IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
+ )
+{
+ return mDevicePathUtilities->IsDevicePathMultiInstance (DevicePath);
+}
+
+/**
+ Retrieves the device path protocol from a handle.
+
+ This function returns the device path protocol from the handle specified by Handle. If Handle is
+ NULL or Handle does not contain a device path protocol, then NULL is returned.
+
+ @param Handle The handle from which to retrieve the device path protocol.
+
+ @return The device path protocol from the handle specified by Handle.
+
+**/
+EFI_DEVICE_PATH_PROTOCOL *
+EFIAPI
+DevicePathFromHandle (
+ IN EFI_HANDLE Handle
+ )
+{
+ EFI_DEVICE_PATH_PROTOCOL *DevicePath;
+ EFI_STATUS Status;
+
+ Status = gBS->HandleProtocol (
+ Handle,
+ &gEfiDevicePathProtocolGuid,
+ (VOID *) &DevicePath
+ );
+ if (EFI_ERROR (Status)) {
+ DevicePath = NULL;
+ }
+ return DevicePath;
+}
+
+/**
+ Allocates a device path for a file and appends it to an existing device path.
+
+ If Device is a valid device handle that contains a device path protocol, then a device path for
+ the file specified by FileName is allocated and appended to the device path associated with the
+ handle Device. The allocated device path is returned. If Device is NULL or Device is a handle
+ that does not support the device path protocol, then a device path containing a single device
+ path node for the file specified by FileName is allocated and returned.
+ If FileName is NULL, then ASSERT().
+
+ @param Device A pointer to a device handle. This parameter is optional and
+ may be NULL.
+ @param FileName A pointer to a Null-terminated Unicode string.
+
+ @return The allocated device path.
+
+**/
+EFI_DEVICE_PATH_PROTOCOL *
+EFIAPI
+FileDevicePath (
+ IN EFI_HANDLE Device, OPTIONAL
+ IN CONST CHAR16 *FileName
+ )
+{
+ UINTN Size;
+ FILEPATH_DEVICE_PATH *FilePath;
+ EFI_DEVICE_PATH_PROTOCOL *DevicePath;
+ EFI_DEVICE_PATH_PROTOCOL *FileDevicePath;
+
+ DevicePath = NULL;
+
+ Size = StrSize (FileName);
+ FileDevicePath = AllocatePool (Size + SIZE_OF_FILEPATH_DEVICE_PATH + EFI_END_DEVICE_PATH_LENGTH);
+ if (FileDevicePath != NULL) {
+ FilePath = (FILEPATH_DEVICE_PATH *) FileDevicePath;
+ FilePath->Header.Type = MEDIA_DEVICE_PATH;
+ FilePath->Header.SubType = MEDIA_FILEPATH_DP;
+ CopyMem (&FilePath->PathName, FileName, Size);
+ SetDevicePathNodeLength (&FilePath->Header, Size + SIZE_OF_FILEPATH_DEVICE_PATH);
+ SetDevicePathEndNode (NextDevicePathNode (&FilePath->Header));
+
+ if (Device != NULL) {
+ DevicePath = DevicePathFromHandle (Device);
+ }
+
+ DevicePath = AppendDevicePath (DevicePath, FileDevicePath);
+ FreePool (FileDevicePath);
+ }
+
+ return DevicePath;
+}
+
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