mirror of https://github.com/acidanthera/audk.git
866 lines
29 KiB
C
866 lines
29 KiB
C
/** @file
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Library instance that implement UEFI Device Path Library class based on protocol
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gEfiDevicePathUtilitiesProtocolGuid.
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Uefi.h>
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#include <Protocol/DevicePathUtilities.h>
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#include <Protocol/DevicePathToText.h>
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#include <Protocol/DevicePathFromText.h>
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#include <Library/DevicePathLib.h>
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#include <Library/DebugLib.h>
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#include <Library/BaseLib.h>
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#include <Library/MemoryAllocationLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/PcdLib.h>
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GLOBAL_REMOVE_IF_UNREFERENCED EFI_DEVICE_PATH_UTILITIES_PROTOCOL *mDevicePathLibDevicePathUtilities = NULL;
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GLOBAL_REMOVE_IF_UNREFERENCED EFI_DEVICE_PATH_TO_TEXT_PROTOCOL *mDevicePathLibDevicePathToText = NULL;
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GLOBAL_REMOVE_IF_UNREFERENCED EFI_DEVICE_PATH_FROM_TEXT_PROTOCOL *mDevicePathLibDevicePathFromText = NULL;
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//
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// Template for an end-of-device path node.
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//
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GLOBAL_REMOVE_IF_UNREFERENCED CONST EFI_DEVICE_PATH_PROTOCOL mUefiDevicePathLibEndDevicePath = {
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END_DEVICE_PATH_TYPE,
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END_ENTIRE_DEVICE_PATH_SUBTYPE,
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{
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END_DEVICE_PATH_LENGTH,
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0
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}
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};
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/**
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The constructor function caches the pointer to DevicePathUtilites protocol.
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The constructor function locates DevicePathUtilities protocol from protocol database.
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It will ASSERT() if that operation fails and it will always return EFI_SUCCESS.
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@param ImageHandle The firmware allocated handle for the EFI image.
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@param SystemTable A pointer to the EFI System Table.
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@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
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**/
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EFI_STATUS
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EFIAPI
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DevicePathLibConstructor (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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EFI_STATUS Status;
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Status = gBS->LocateProtocol (
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&gEfiDevicePathUtilitiesProtocolGuid,
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NULL,
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(VOID**) &mDevicePathLibDevicePathUtilities
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);
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ASSERT_EFI_ERROR (Status);
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ASSERT (mDevicePathLibDevicePathUtilities != NULL);
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return Status;
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}
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/**
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Determine whether a given device path is valid.
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If DevicePath is NULL, then ASSERT().
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@param DevicePath A pointer to a device path data structure.
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@param MaxSize The maximum size of the device path data structure.
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@retval TRUE DevicePath is valid.
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@retval FALSE The length of any node node in the DevicePath is less
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than sizeof (EFI_DEVICE_PATH_PROTOCOL).
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@retval FALSE If MaxSize is not zero, the size of the DevicePath
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exceeds MaxSize.
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@retval FALSE If PcdMaximumDevicePathNodeCount is not zero, the node
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count of the DevicePath exceeds PcdMaximumDevicePathNodeCount.
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**/
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BOOLEAN
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EFIAPI
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IsDevicePathValid (
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IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath,
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IN UINTN MaxSize
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)
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{
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UINTN Count;
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UINTN Size;
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UINTN NodeLength;
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ASSERT (DevicePath != NULL);
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if (MaxSize == 0) {
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MaxSize = MAX_UINTN;
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}
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//
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// Validate the input size big enough to touch the first node.
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//
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if (MaxSize < sizeof (EFI_DEVICE_PATH_PROTOCOL)) {
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return FALSE;
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}
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for (Count = 0, Size = 0; !IsDevicePathEnd (DevicePath); DevicePath = NextDevicePathNode (DevicePath)) {
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NodeLength = DevicePathNodeLength (DevicePath);
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if (NodeLength < sizeof (EFI_DEVICE_PATH_PROTOCOL)) {
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return FALSE;
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}
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if (NodeLength > MAX_UINTN - Size) {
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return FALSE;
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}
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Size += NodeLength;
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//
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// Validate next node before touch it.
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//
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if (Size > MaxSize - END_DEVICE_PATH_LENGTH ) {
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return FALSE;
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}
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if (PcdGet32 (PcdMaximumDevicePathNodeCount) > 0) {
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Count++;
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if (Count >= PcdGet32 (PcdMaximumDevicePathNodeCount)) {
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return FALSE;
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}
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}
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//
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// FilePath must be a NULL-terminated string.
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//
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if (DevicePathType (DevicePath) == MEDIA_DEVICE_PATH &&
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DevicePathSubType (DevicePath) == MEDIA_FILEPATH_DP &&
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*(CHAR16 *)((UINT8 *)DevicePath + NodeLength - 2) != 0) {
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return FALSE;
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}
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}
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//
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// Only return TRUE when the End Device Path node is valid.
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//
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return (BOOLEAN) (DevicePathNodeLength (DevicePath) == END_DEVICE_PATH_LENGTH);
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}
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/**
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Returns the Type field of a device path node.
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Returns the Type field of the device path node specified by Node.
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If Node is NULL, then ASSERT().
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@param Node A pointer to a device path node data structure.
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@return The Type field of the device path node specified by Node.
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**/
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UINT8
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EFIAPI
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DevicePathType (
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IN CONST VOID *Node
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)
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{
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ASSERT (Node != NULL);
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return ((EFI_DEVICE_PATH_PROTOCOL *)(Node))->Type;
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}
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/**
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Returns the SubType field of a device path node.
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Returns the SubType field of the device path node specified by Node.
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If Node is NULL, then ASSERT().
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@param Node A pointer to a device path node data structure.
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@return The SubType field of the device path node specified by Node.
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**/
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UINT8
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EFIAPI
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DevicePathSubType (
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IN CONST VOID *Node
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)
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{
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ASSERT (Node != NULL);
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return ((EFI_DEVICE_PATH_PROTOCOL *)(Node))->SubType;
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}
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/**
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Returns the 16-bit Length field of a device path node.
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Returns the 16-bit Length field of the device path node specified by Node.
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Node is not required to be aligned on a 16-bit boundary, so it is recommended
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that a function such as ReadUnaligned16() be used to extract the contents of
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the Length field.
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If Node is NULL, then ASSERT().
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@param Node A pointer to a device path node data structure.
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@return The 16-bit Length field of the device path node specified by Node.
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**/
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UINTN
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EFIAPI
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DevicePathNodeLength (
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IN CONST VOID *Node
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)
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{
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ASSERT (Node != NULL);
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return ReadUnaligned16 ((UINT16 *)&((EFI_DEVICE_PATH_PROTOCOL *)(Node))->Length[0]);
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}
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/**
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Returns a pointer to the next node in a device path.
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Returns a pointer to the device path node that follows the device path node
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specified by Node.
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If Node is NULL, then ASSERT().
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@param Node A pointer to a device path node data structure.
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@return a pointer to the device path node that follows the device path node
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specified by Node.
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**/
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EFI_DEVICE_PATH_PROTOCOL *
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EFIAPI
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NextDevicePathNode (
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IN CONST VOID *Node
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)
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{
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ASSERT (Node != NULL);
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return (EFI_DEVICE_PATH_PROTOCOL *)((UINT8 *)(Node) + DevicePathNodeLength(Node));
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}
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/**
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Determines if a device path node is an end node of a device path.
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This includes nodes that are the end of a device path instance and nodes that
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are the end of an entire device path.
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Determines if the device path node specified by Node is an end node of a device path.
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This includes nodes that are the end of a device path instance and nodes that are the
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end of an entire device path. If Node represents an end node of a device path,
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then TRUE is returned. Otherwise, FALSE is returned.
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If Node is NULL, then ASSERT().
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@param Node A pointer to a device path node data structure.
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@retval TRUE The device path node specified by Node is an end node of a device path.
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@retval FALSE The device path node specified by Node is not an end node of
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a device path.
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**/
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BOOLEAN
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EFIAPI
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IsDevicePathEndType (
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IN CONST VOID *Node
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)
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{
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ASSERT (Node != NULL);
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return (BOOLEAN) (DevicePathType (Node) == END_DEVICE_PATH_TYPE);
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}
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/**
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Determines if a device path node is an end node of an entire device path.
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Determines if a device path node specified by Node is an end node of an entire
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device path.
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If Node represents the end of an entire device path, then TRUE is returned.
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Otherwise, FALSE is returned.
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If Node is NULL, then ASSERT().
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@param Node A pointer to a device path node data structure.
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@retval TRUE The device path node specified by Node is the end of an entire device path.
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@retval FALSE The device path node specified by Node is not the end of an entire device path.
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**/
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BOOLEAN
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EFIAPI
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IsDevicePathEnd (
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IN CONST VOID *Node
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)
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{
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ASSERT (Node != NULL);
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return (BOOLEAN) (IsDevicePathEndType (Node) && DevicePathSubType(Node) == END_ENTIRE_DEVICE_PATH_SUBTYPE);
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}
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/**
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Determines if a device path node is an end node of a device path instance.
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Determines if a device path node specified by Node is an end node of a device
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path instance.
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If Node represents the end of a device path instance, then TRUE is returned.
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Otherwise, FALSE is returned.
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If Node is NULL, then ASSERT().
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@param Node A pointer to a device path node data structure.
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@retval TRUE The device path node specified by Node is the end of a device
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path instance.
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@retval FALSE The device path node specified by Node is not the end of a
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device path instance.
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**/
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BOOLEAN
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EFIAPI
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IsDevicePathEndInstance (
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IN CONST VOID *Node
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)
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{
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ASSERT (Node != NULL);
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return (BOOLEAN) (IsDevicePathEndType (Node) && DevicePathSubType(Node) == END_INSTANCE_DEVICE_PATH_SUBTYPE);
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}
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/**
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Sets the length, in bytes, of a device path node.
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Sets the length of the device path node specified by Node to the value specified
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by NodeLength. NodeLength is returned. Node is not required to be aligned on
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a 16-bit boundary, so it is recommended that a function such as WriteUnaligned16()
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be used to set the contents of the Length field.
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If Node is NULL, then ASSERT().
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If NodeLength >= SIZE_64KB, then ASSERT().
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If NodeLength < sizeof (EFI_DEVICE_PATH_PROTOCOL), then ASSERT().
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@param Node A pointer to a device path node data structure.
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@param Length The length, in bytes, of the device path node.
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@return Length
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**/
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UINT16
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EFIAPI
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SetDevicePathNodeLength (
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IN OUT VOID *Node,
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IN UINTN Length
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)
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{
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ASSERT (Node != NULL);
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ASSERT ((Length >= sizeof (EFI_DEVICE_PATH_PROTOCOL)) && (Length < SIZE_64KB));
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return WriteUnaligned16 ((UINT16 *)&((EFI_DEVICE_PATH_PROTOCOL *)(Node))->Length[0], (UINT16)(Length));
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}
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/**
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Fills in all the fields of a device path node that is the end of an entire device path.
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Fills in all the fields of a device path node specified by Node so Node represents
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the end of an entire device path. The Type field of Node is set to
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END_DEVICE_PATH_TYPE, the SubType field of Node is set to
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END_ENTIRE_DEVICE_PATH_SUBTYPE, and the Length field of Node is set to
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END_DEVICE_PATH_LENGTH. Node is not required to be aligned on a 16-bit boundary,
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so it is recommended that a function such as WriteUnaligned16() be used to set
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the contents of the Length field.
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If Node is NULL, then ASSERT().
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@param Node A pointer to a device path node data structure.
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**/
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VOID
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EFIAPI
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SetDevicePathEndNode (
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OUT VOID *Node
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)
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{
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ASSERT (Node != NULL);
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CopyMem (Node, &mUefiDevicePathLibEndDevicePath, sizeof (mUefiDevicePathLibEndDevicePath));
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}
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/**
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Returns the size of a device path in bytes.
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This function returns the size, in bytes, of the device path data structure
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specified by DevicePath including the end of device path node.
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If DevicePath is NULL or invalid, then 0 is returned.
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@param DevicePath A pointer to a device path data structure.
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@retval 0 If DevicePath is NULL or invalid.
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@retval Others The size of a device path in bytes.
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**/
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UINTN
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EFIAPI
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GetDevicePathSize (
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IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
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)
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{
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return mDevicePathLibDevicePathUtilities->GetDevicePathSize (DevicePath);
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}
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/**
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Creates a new copy of an existing device path.
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This function allocates space for a new copy of the device path specified by
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DevicePath. If DevicePath is NULL, then NULL is returned.
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If the memory is successfully allocated, then the
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contents of DevicePath are copied to the newly allocated buffer, and a pointer to that buffer
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is returned. Otherwise, NULL is returned.
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The memory for the new device path is allocated from EFI boot services memory.
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It is the responsibility of the caller to free the memory allocated.
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@param DevicePath A pointer to a device path data structure.
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@retval NULL If DevicePath is NULL or invalid.
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@retval Others A pointer to the duplicated device path.
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**/
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EFI_DEVICE_PATH_PROTOCOL *
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EFIAPI
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DuplicateDevicePath (
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IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
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)
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{
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return mDevicePathLibDevicePathUtilities->DuplicateDevicePath (DevicePath);
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}
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/**
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Creates a new device path by appending a second device path to a first device path.
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This function creates a new device path by appending a copy of SecondDevicePath to a copy of
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FirstDevicePath in a newly allocated buffer. Only the end-of-device-path device node from
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SecondDevicePath is retained. The newly created device path is returned.
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If FirstDevicePath is NULL, then it is ignored, and a duplicate of SecondDevicePath is returned.
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If SecondDevicePath is NULL, then it is ignored, and a duplicate of FirstDevicePath is returned.
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If both FirstDevicePath and SecondDevicePath are NULL, then a copy of an end-of-device-path is
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returned.
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If there is not enough memory for the newly allocated buffer, then NULL is returned.
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The memory for the new device path is allocated from EFI boot services memory. It is the
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responsibility of the caller to free the memory allocated.
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@param FirstDevicePath A pointer to a device path data structure.
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@param SecondDevicePath A pointer to a device path data structure.
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@retval NULL If there is not enough memory for the newly allocated buffer.
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@retval NULL If FirstDevicePath or SecondDevicePath is invalid.
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@retval Others A pointer to the new device path if success.
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Or a copy an end-of-device-path if both FirstDevicePath and
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SecondDevicePath are NULL.
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**/
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EFI_DEVICE_PATH_PROTOCOL *
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EFIAPI
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AppendDevicePath (
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IN CONST EFI_DEVICE_PATH_PROTOCOL *FirstDevicePath, OPTIONAL
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IN CONST EFI_DEVICE_PATH_PROTOCOL *SecondDevicePath OPTIONAL
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)
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{
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return mDevicePathLibDevicePathUtilities->AppendDevicePath (FirstDevicePath, SecondDevicePath);
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}
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/**
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Creates a new path by appending the device node to the device path.
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This function creates a new device path by appending a copy of the device node
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specified by DevicePathNode to a copy of the device path specified by DevicePath
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in an allocated buffer.
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The end-of-device-path device node is moved after the end of the appended device node.
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If DevicePathNode is NULL then a copy of DevicePath is returned.
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If DevicePath is NULL then a copy of DevicePathNode, followed by an end-of-device
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path device node is returned.
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If both DevicePathNode and DevicePath are NULL then a copy of an end-of-device-path
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device node is returned.
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If there is not enough memory to allocate space for the new device path, then
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NULL is returned.
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The memory is allocated from EFI boot services memory. It is the responsibility
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of the caller to free the memory allocated.
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@param DevicePath A pointer to a device path data structure.
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@param DevicePathNode A pointer to a single device path node.
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@retval NULL If there is not enough memory for the new device path.
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@retval Others A pointer to the new device path if success.
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A copy of DevicePathNode followed by an end-of-device-path node
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if both FirstDevicePath and SecondDevicePath are NULL.
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A copy of an end-of-device-path node if both FirstDevicePath
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and SecondDevicePath are NULL.
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**/
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EFI_DEVICE_PATH_PROTOCOL *
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EFIAPI
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AppendDevicePathNode (
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IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath, OPTIONAL
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IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePathNode OPTIONAL
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)
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{
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return mDevicePathLibDevicePathUtilities->AppendDeviceNode (DevicePath, DevicePathNode);
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}
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/**
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Creates a new device path by appending the specified device path instance to
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the specified device path.
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This function creates a new device path by appending a copy of the device path
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instance specified by DevicePathInstance to a copy of the device path specified
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by DevicePath in a allocated buffer.
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The end-of-device-path device node is moved after the end of the appended device
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path instance and a new end-of-device-path-instance node is inserted between.
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If DevicePath is NULL, then a copy if DevicePathInstance is returned.
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If DevicePathInstance is NULL, then NULL is returned.
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If DevicePath or DevicePathInstance is invalid, then NULL is returned.
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If there is not enough memory to allocate space for the new device path, then
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NULL is returned.
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The memory is allocated from EFI boot services memory. It is the responsibility
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of the caller to free the memory allocated.
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@param DevicePath A pointer to a device path data structure.
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@param DevicePathInstance A pointer to a device path instance.
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@return A pointer to the new device path.
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**/
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EFI_DEVICE_PATH_PROTOCOL *
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EFIAPI
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AppendDevicePathInstance (
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IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath, OPTIONAL
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IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePathInstance OPTIONAL
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)
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{
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return mDevicePathLibDevicePathUtilities->AppendDevicePathInstance (DevicePath, DevicePathInstance);
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}
|
|
|
|
/**
|
|
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 mDevicePathLibDevicePathUtilities->GetNextDevicePathInstance (DevicePath, Size);
|
|
}
|
|
|
|
/**
|
|
Creates a device node.
|
|
|
|
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 mDevicePathLibDevicePathUtilities->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 or invalid, 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 or invalid.
|
|
|
|
**/
|
|
BOOLEAN
|
|
EFIAPI
|
|
IsDevicePathMultiInstance (
|
|
IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
|
|
)
|
|
{
|
|
return mDevicePathLibDevicePathUtilities->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.
|
|
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.
|
|
|
|
If FileName is NULL, then ASSERT().
|
|
If FileName is not aligned on a 16-bit boundary, 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 + 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;
|
|
}
|
|
|
|
/**
|
|
Locate and return the protocol instance identified by the ProtocolGuid.
|
|
|
|
@param ProtocolGuid The GUID of the protocol.
|
|
|
|
@return A pointer to the protocol instance or NULL when absent.
|
|
**/
|
|
VOID *
|
|
UefiDevicePathLibLocateProtocol (
|
|
EFI_GUID *ProtocolGuid
|
|
)
|
|
{
|
|
EFI_STATUS Status;
|
|
VOID *Protocol;
|
|
Status = gBS->LocateProtocol (
|
|
ProtocolGuid,
|
|
NULL,
|
|
(VOID**) &Protocol
|
|
);
|
|
if (EFI_ERROR (Status)) {
|
|
return NULL;
|
|
} else {
|
|
return Protocol;
|
|
}
|
|
}
|
|
|
|
/**
|
|
Converts a device node to its string representation.
|
|
|
|
@param DeviceNode A Pointer to the device node to be converted.
|
|
@param DisplayOnly If DisplayOnly is TRUE, then the shorter text representation
|
|
of the display node is used, where applicable. If DisplayOnly
|
|
is FALSE, then the longer text representation of the display node
|
|
is used.
|
|
@param AllowShortcuts If AllowShortcuts is TRUE, then the shortcut forms of text
|
|
representation for a device node can be used, where applicable.
|
|
|
|
@return A pointer to the allocated text representation of the device node or NULL if DeviceNode
|
|
is NULL or there was insufficient memory.
|
|
|
|
**/
|
|
CHAR16 *
|
|
EFIAPI
|
|
ConvertDeviceNodeToText (
|
|
IN CONST EFI_DEVICE_PATH_PROTOCOL *DeviceNode,
|
|
IN BOOLEAN DisplayOnly,
|
|
IN BOOLEAN AllowShortcuts
|
|
)
|
|
{
|
|
if (mDevicePathLibDevicePathToText == NULL) {
|
|
mDevicePathLibDevicePathToText = UefiDevicePathLibLocateProtocol (&gEfiDevicePathToTextProtocolGuid);
|
|
}
|
|
if (mDevicePathLibDevicePathToText != NULL) {
|
|
return mDevicePathLibDevicePathToText->ConvertDeviceNodeToText (DeviceNode, DisplayOnly, AllowShortcuts);
|
|
} else {
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
Converts a device path to its text representation.
|
|
|
|
@param DevicePath A Pointer to the device to be converted.
|
|
@param DisplayOnly If DisplayOnly is TRUE, then the shorter text representation
|
|
of the display node is used, where applicable. If DisplayOnly
|
|
is FALSE, then the longer text representation of the display node
|
|
is used.
|
|
@param AllowShortcuts If AllowShortcuts is TRUE, then the shortcut forms of text
|
|
representation for a device node can be used, where applicable.
|
|
|
|
@return A pointer to the allocated text representation of the device path or
|
|
NULL if DeviceNode is NULL or there was insufficient memory.
|
|
|
|
**/
|
|
CHAR16 *
|
|
EFIAPI
|
|
ConvertDevicePathToText (
|
|
IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath,
|
|
IN BOOLEAN DisplayOnly,
|
|
IN BOOLEAN AllowShortcuts
|
|
)
|
|
{
|
|
if (mDevicePathLibDevicePathToText == NULL) {
|
|
mDevicePathLibDevicePathToText = UefiDevicePathLibLocateProtocol (&gEfiDevicePathToTextProtocolGuid);
|
|
}
|
|
if (mDevicePathLibDevicePathToText != NULL) {
|
|
return mDevicePathLibDevicePathToText->ConvertDevicePathToText (DevicePath, DisplayOnly, AllowShortcuts);
|
|
} else {
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
Convert text to the binary representation of a device node.
|
|
|
|
@param TextDeviceNode TextDeviceNode points to the text representation of a device
|
|
node. Conversion starts with the first character and continues
|
|
until the first non-device node character.
|
|
|
|
@return A pointer to the EFI device node or NULL if TextDeviceNode is NULL or there was
|
|
insufficient memory or text unsupported.
|
|
|
|
**/
|
|
EFI_DEVICE_PATH_PROTOCOL *
|
|
EFIAPI
|
|
ConvertTextToDeviceNode (
|
|
IN CONST CHAR16 *TextDeviceNode
|
|
)
|
|
{
|
|
if (mDevicePathLibDevicePathFromText == NULL) {
|
|
mDevicePathLibDevicePathFromText = UefiDevicePathLibLocateProtocol (&gEfiDevicePathFromTextProtocolGuid);
|
|
}
|
|
if (mDevicePathLibDevicePathFromText != NULL) {
|
|
return mDevicePathLibDevicePathFromText->ConvertTextToDeviceNode (TextDeviceNode);
|
|
} else {
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
Convert text to the binary representation of a device path.
|
|
|
|
|
|
@param TextDevicePath TextDevicePath points to the text representation of a device
|
|
path. Conversion starts with the first character and continues
|
|
until the first non-device node character.
|
|
|
|
@return A pointer to the allocated device path or NULL if TextDeviceNode is NULL or
|
|
there was insufficient memory.
|
|
|
|
**/
|
|
EFI_DEVICE_PATH_PROTOCOL *
|
|
EFIAPI
|
|
ConvertTextToDevicePath (
|
|
IN CONST CHAR16 *TextDevicePath
|
|
)
|
|
{
|
|
if (mDevicePathLibDevicePathFromText == NULL) {
|
|
mDevicePathLibDevicePathFromText = UefiDevicePathLibLocateProtocol (&gEfiDevicePathFromTextProtocolGuid);
|
|
}
|
|
if (mDevicePathLibDevicePathFromText != NULL) {
|
|
return mDevicePathLibDevicePathFromText->ConvertTextToDevicePath (TextDevicePath);
|
|
} else {
|
|
return NULL;
|
|
}
|
|
}
|
|
|