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/** @file
AML Iterator.
Copyright (c) 2019 - 2020, Arm Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef AML_ITERATOR_H_
#define AML_ITERATOR_H_
/* This header file does not include internal Node definition,
i.e. AML_ROOT_NODE, AML_OBJECT_NODE, etc. The node definitions
must be included by the caller file. The function prototypes must
only expose AML_NODE_HANDLE, AML_ROOT_NODE_HANDLE, etc. node
definitions.
This allows to keep the functions defined here both internal and
potentially external. If necessary, any function of this file can
be exposed externally.
The Api folder is internal to the AmlLib, but should only use these
functions. They provide a "safe" way to interact with the AmlLib.
*/
/**
@defgroup IteratorLibrary Iterator library
@ingroup NavigationApis
@{
The iterator library allow to navigate in the AML tree using an iterator.
It is possible to initialize/delete an iterator.
This iterator can progress in the tree by different orders:
- Linear progression: Iterate following the AML bytestream order
(depth first).
- Branch progression: Iterate following the AML bytestream order
(depth first), but stop iterating at the
end of the branch.
An iterator has the following features:
- GetNode: Get the current node pointed by the iterator.
- GetNext: Move the current node of the iterator to the next
node, according to the iteration mode selected.
- GetPrevious: Move the current node of the iterator to the previous
node, according to the iteration mode selected.
@}
*/
/**
@defgroup IteratorApis Iterator APIs
@ingroup IteratorLibrary
@{
Iterator APIs defines the action that can be done on an iterator:
- Initialization;
- Deletion;
- Getting the node currently pointed by the iterator;
- Moving to the next node;
- Moving to the previous node.
@}
*/
/**
@defgroup IteratorStructures Iterator structures
@ingroup IteratorLibrary
@{
Iterator structures define the enum/define values and structures related
to iterators.
@}
*/
/** Iterator mode.
Modes to choose how the iterator is progressing in the tree.
A
\-B <- Iterator initialized with this node.
| \-C
| | \-D
| \-E
| \-F
| \-G
\-H
\-I
@ingroup IteratorStructures
*/
typedef enum EAmlIteratorMode {
EAmlIteratorUnknown, ///< Unknown/Invalid AML IteratorMode
EAmlIteratorLinear, ///< Iterate following the AML bytestream order
/// (depth first).
/// The order followed by the iterator would be:
/// B, C, D, E, F, G, H, I, NULL.
EAmlIteratorBranch, ///< Iterate through the node of a branch.
/// The iteration follows the AML bytestream
/// order but within the branch B.
/// The order followed by the iterator would be:
/// B, C, D, E, F, G, NULL.
EAmlIteratorModeMax ///< Max enum.
} EAML_ITERATOR_MODE;
/** Iterator.
Allows to traverse the tree in different orders.
@ingroup IteratorStructures
*/
typedef struct AmlTreeIterator AML_TREE_ITERATOR;
/** Function pointer to a get the current node of the iterator.
@ingroup IteratorApis
@param [in] Iterator Pointer to an iterator.
@param [out] OutNode Pointer holding the current node.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_INVALID_PARAMETER Invalid parameter.
*/
typedef
EFI_STATUS
(EFIAPI * EDKII_AML_TREE_ITERATOR_GET_NODE) (
IN AML_TREE_ITERATOR * Iterator,
OUT AML_NODE_HANDLE * OutNode
);
/** Function pointer to move the current node of the iterator to the
next node, according to the iteration mode selected.
If NextNode is not NULL, return the next node.
@ingroup IteratorApis
@param [in] Iterator Pointer to an iterator.
@param [out] NextNode If not NULL, updated to the next node.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_INVALID_PARAMETER Invalid parameter.
*/
typedef
EFI_STATUS
(EFIAPI * EDKII_AML_TREE_ITERATOR_GET_NEXT) (
IN AML_TREE_ITERATOR * Iterator,
OUT AML_NODE_HANDLE * NextNode
);
/** Function pointer to move the current node of the iterator to the
previous node, according to the iteration mode selected.
If PrevNode is not NULL, return the previous node.
@ingroup IteratorApis
@param [in] Iterator Pointer to an iterator.
@param [out] PrevNode If not NULL, updated to the previous node.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_INVALID_PARAMETER Invalid parameter.
*/
typedef
EFI_STATUS
(EFIAPI * EDKII_AML_TREE_ITERATOR_GET_PREVIOUS) (
IN AML_TREE_ITERATOR * Iterator,
OUT AML_NODE_HANDLE * PrevNode
);
/** Iterator structure to traverse the tree.
@ingroup IteratorStructures
*/
typedef struct AmlTreeIterator {
/// Get the current node of the iterator.
EDKII_AML_TREE_ITERATOR_GET_NODE GetNode;
/// Update the current node of the iterator with the next node.
EDKII_AML_TREE_ITERATOR_GET_NEXT GetNext;
/// Update the current node of the iterator with the previous node.
EDKII_AML_TREE_ITERATOR_GET_PREVIOUS GetPrevious;
} AML_TREE_ITERATOR;
/** Initialize an iterator.
Note: The caller must call AmlDeleteIterator () to free the memory
allocated for the iterator.
@ingroup IteratorApis
@param [in] Node Pointer to the node.
@param [in] IteratorMode Selected mode to traverse the tree.
@param [out] IteratorPtr Pointer holding the created iterator.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_INVALID_PARAMETER Invalid parameter.
@retval EFI_OUT_OF_RESOURCES Could not allocate memory.
**/
EFI_STATUS
EFIAPI
AmlInitializeIterator (
IN AML_NODE_HANDLE Node,
IN EAML_ITERATOR_MODE IteratorMode,
OUT AML_TREE_ITERATOR ** IteratorPtr
);
/** Delete an iterator.
Note: The caller must have first initialized the iterator with the
AmlInitializeIterator () function.
@ingroup IteratorApis
@param [in] Iterator Pointer to an iterator.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_INVALID_PARAMETER Invalid parameter.
**/
EFI_STATUS
EFIAPI
AmlDeleteIterator (
IN AML_TREE_ITERATOR * Iterator
);
#endif // AML_ITERATOR_H_
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