[PATCH v4 5/8] DynamicTablesPkg: Add AmlAttachNode()

["PierreGondois" <pierre.gondois@arm.com>]

From: Pierre Gondois <Pierre.Gondois@arm.com>

This function allows to add a node as the last node of a parent node
in an AML tree. For instance,
ASL code corresponding to NewNode:
  Name (_UID, 0)

ASL code corresponding to ParentNode:
  Device (PCI0) {
    Name(_HID, EISAID("PNP0A08"))
  }

"AmlAttachNode (ParentNode, NewNode)" will result in:
ASL code:
  Device (PCI0) {
    Name(_HID, EISAID("PNP0A08"))
    Name (_UID, 0)
  }

To: Sami Mujawar <sami.mujawar@arm.com>
To: Alexei Fedorov <Alexei.Fedorov@arm.com>
Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>
Signed-off-by: Pierre Gondois <Pierre.Gondois@arm.com>
---
 .../Include/Library/AmlLib/AmlLib.h           | 33 +++++++++++++++++
 .../Library/Common/AmlLib/Api/AmlApi.c        | 36 +++++++++++++++++++
 2 files changed, 69 insertions(+)

diff --git a/DynamicTablesPkg/Include/Library/AmlLib/AmlLib.h b/DynamicTablesPkg/Include/Library/AmlLib/AmlLib.h
index 9ca34f61ba88..af18bf8e4871 100644
--- a/DynamicTablesPkg/Include/Library/AmlLib/AmlLib.h
+++ b/DynamicTablesPkg/Include/Library/AmlLib/AmlLib.h
@@ -166,6 +166,39 @@ AmlDetachNode (
   IN  AML_NODE_HANDLE  Node
   );
 
+/** Attach a node in an AML tree.
+
+  The node will be added as the last statement of the ParentNode.
+  E.g.:
+  ASL code corresponding to NewNode:
+  Name (_UID, 0)
+
+  ASL code corresponding to ParentNode:
+  Device (PCI0) {
+    Name(_HID, EISAID("PNP0A08"))
+  }
+
+  "AmlAttachNode (ParentNode, NewNode)" will result in:
+  ASL code:
+  Device (PCI0) {
+    Name(_HID, EISAID("PNP0A08"))
+    Name (_UID, 0)
+  }
+
+  @param  [in]  ParentNode  Pointer to the parent node.
+                            Must be a root or an object node.
+  @param  [in]  NewNode     Pointer to the node to add.
+
+  @retval EFI_SUCCESS             The function completed successfully.
+  @retval EFI_INVALID_PARAMETER   Invalid parameter.
+**/
+EFI_STATUS
+EFIAPI
+AmlAttachNode (
+  IN  AML_NODE_HANDLE  ParentNode,
+  IN  AML_NODE_HANDLE  NewNode
+  );
+
 /** Find a node in the AML namespace, given an ASL path and a reference Node.
 
    - The AslPath can be an absolute path, or a relative path from the
diff --git a/DynamicTablesPkg/Library/Common/AmlLib/Api/AmlApi.c b/DynamicTablesPkg/Library/Common/AmlLib/Api/AmlApi.c
index e6802d211eb7..519afdc1eafa 100644
--- a/DynamicTablesPkg/Library/Common/AmlLib/Api/AmlApi.c
+++ b/DynamicTablesPkg/Library/Common/AmlLib/Api/AmlApi.c
@@ -394,6 +394,42 @@ AmlNameOpGetNextRdNode (
   return EFI_SUCCESS;
 }
 
+/** Attach a node in an AML tree.
+
+  The node will be added as the last statement of the ParentNode.
+  E.g.:
+  ASL code corresponding to NewNode:
+  Name (_UID, 0)
+
+  ASL code corresponding to ParentNode:
+  Device (PCI0) {
+    Name(_HID, EISAID("PNP0A08"))
+  }
+
+  "AmlAttachNode (ParentNode, NewNode)" will result in:
+  ASL code:
+  Device (PCI0) {
+    Name(_HID, EISAID("PNP0A08"))
+    Name (_UID, 0)
+  }
+
+  @param  [in]  ParentNode  Pointer to the parent node.
+                            Must be a root or an object node.
+  @param  [in]  NewNode     Pointer to the node to add.
+
+  @retval EFI_SUCCESS             The function completed successfully.
+  @retval EFI_INVALID_PARAMETER   Invalid parameter.
+**/
+EFI_STATUS
+EFIAPI
+AmlAttachNode (
+  IN  AML_NODE_HANDLE  ParentNode,
+  IN  AML_NODE_HANDLE  NewNode
+  )
+{
+  return AmlVarListAddTail (ParentNode, NewNode);
+}
+
 // DEPRECATED APIS
 #ifndef DISABLE_NEW_DEPRECATED_INTERFACES
 
-- 
2.25.1