From e386b444c88b01c5a14ca846b6ba10dcf5536e05 Mon Sep 17 00:00:00 2001 From: vanjeff Date: Fri, 22 Jun 2007 06:57:39 +0000 Subject: Import some Pei and Dxe related instances for MdePkg. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2712 6f19259b-4bc3-4df7-8a09-765794883524 --- .../UefiDevicePathLib.c | 353 +++++++++++++++++++++ 1 file changed, 353 insertions(+) create mode 100644 MdePkg/Library/UefiDevicePathLibDevicePathProtocol/UefiDevicePathLib.c (limited to 'MdePkg/Library/UefiDevicePathLibDevicePathProtocol/UefiDevicePathLib.c') diff --git a/MdePkg/Library/UefiDevicePathLibDevicePathProtocol/UefiDevicePathLib.c b/MdePkg/Library/UefiDevicePathLibDevicePathProtocol/UefiDevicePathLib.c new file mode 100644 index 0000000000..2492e4b95d --- /dev/null +++ b/MdePkg/Library/UefiDevicePathLibDevicePathProtocol/UefiDevicePathLib.c @@ -0,0 +1,353 @@ +/** @file + UEFI Device Path Library. + + Copyright (c) 2006, Intel Corporation
+ 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 + +**/ + +// +// Include common header file for this module. +// +#include "CommonHeader.h" + +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; +} + -- cgit v1.2.3