a357faa327
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7651 6f19259b-4bc3-4df7-8a09-765794883524
601 lines
21 KiB
C
601 lines
21 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 - 2008, Intel Corporation<BR>
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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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/DevicePath.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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EFI_DEVICE_PATH_UTILITIES_PROTOCOL *mDevicePathUtilities = 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**) &mDevicePathUtilities
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);
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ASSERT_EFI_ERROR (Status);
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ASSERT (mDevicePathUtilities != NULL);
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return Status;
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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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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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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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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 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 specified by Node.
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**/
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EFI_DEVICE_PATH_PROTOCOL *
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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 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 a device path.
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**/
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BOOLEAN
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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 device path.
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If Node represents the end of an entire device path, 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 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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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 path instance.
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If Node represents the end of a device path instance, 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 the end of a device path instance.
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@retval FALSE The device path node specified by Node is not the end of a device path instance.
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**/
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BOOLEAN
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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 >= 0x10000, 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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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 < 0x10000);
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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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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 specified by
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DevicePath including the end of device path node. If DevicePath is NULL, 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.
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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 mDevicePathUtilities->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 DevicePath. If
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DevicePath is NULL, then NULL is returned. 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.
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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 mDevicePathUtilities->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 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 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 mDevicePathUtilities->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 specified by
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DevicePathNode to a copy of the device path specified by DevicePath 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 path device
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node is returned.
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If both DevicePathNode and DevicePath are NULL then a copy of an end-of-device-path device node
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is returned.
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If there is not enough memory to allocate space for the new device path, then NULL is returned.
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The memory is allocated from EFI boot services memory. It is the responsibility of the caller to
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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 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 mDevicePathUtilities->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 the specified device
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path.
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This function creates a new device path by appending a copy of the device path instance specified
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by DevicePathInstance to a copy of the device path secified 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 path instance
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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 there is not enough memory to allocate space for the new device path, then NULL is returned.
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The memory is allocated from EFI boot services memory. It is the responsibility of the caller to
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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 mDevicePathUtilities->AppendDevicePathInstance (DevicePath, DevicePathInstance);
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}
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/**
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Creates a copy of the current device path instance and returns a pointer to the next device path
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instance.
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This function creates a copy of the current device path instance. It also updates DevicePath to
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point to the next device path instance in the device path (or NULL if no more) and updates Size
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to hold the size of the device path instance copy.
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If DevicePath is NULL, then NULL is returned.
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If there is not enough memory to allocate space for the new device path, then NULL is returned.
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The memory is allocated from EFI boot services memory. It is the responsibility of the caller to
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free the memory allocated.
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If Size is NULL, then ASSERT().
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@param DevicePath On input, this holds the pointer to the current device path
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instance. On output, this holds the pointer to the next device
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path instance or NULL if there are no more device path
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instances in the device path pointer to a device path data
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structure.
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@param Size On output, this holds the size of the device path instance, in
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bytes or zero, if DevicePath is NULL.
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@return A pointer to the current device path instance.
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**/
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EFI_DEVICE_PATH_PROTOCOL *
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EFIAPI
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GetNextDevicePathInstance (
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IN OUT EFI_DEVICE_PATH_PROTOCOL **DevicePath,
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OUT UINTN *Size
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)
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{
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ASSERT (Size != NULL);
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return mDevicePathUtilities->GetNextDevicePathInstance (DevicePath, Size);
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}
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/**
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Creates a device node.
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This function creates a new device node in a newly allocated buffer of size NodeLength and
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initializes the device path node header with NodeType and NodeSubType. The new device path node
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is returned.
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If NodeLength is smaller than a device path header, then NULL is returned.
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If there is not enough memory to allocate space for the new device path, then NULL is returned.
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The memory is allocated from EFI boot services memory. It is the responsibility of the caller to
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free the memory allocated.
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@param NodeType The device node type for the new device node.
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@param NodeSubType The device node sub-type for the new device node.
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@param NodeLength The length of the new device node.
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@return 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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CreateDeviceNode (
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IN UINT8 NodeType,
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IN UINT8 NodeSubType,
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IN UINT16 NodeLength
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)
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{
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return mDevicePathUtilities->CreateDeviceNode (NodeType, NodeSubType, NodeLength);
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}
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/**
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Determines if a device path is single or multi-instance.
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This function returns TRUE if the device path specified by DevicePath is multi-instance.
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Otherwise, FALSE is returned. If DevicePath is NULL, then FALSE is returned.
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@param DevicePath A pointer to a device path data structure.
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@retval TRUE DevicePath is multi-instance.
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@retval FALSE DevicePath is not multi-instance or DevicePath is NULL.
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**/
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BOOLEAN
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EFIAPI
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IsDevicePathMultiInstance (
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IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath
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)
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{
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return mDevicePathUtilities->IsDevicePathMultiInstance (DevicePath);
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}
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/**
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Retrieves the device path protocol from a handle.
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This function returns the device path protocol from the handle specified by Handle. If Handle is
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NULL or Handle does not contain a device path protocol, then NULL is returned.
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@param Handle The handle from which to retrieve the device path protocol.
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@return The device path protocol from the handle specified by Handle.
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**/
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|
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;
|
|
}
|