[PATCH 2/4] DynamicTablesPkg: Add support for simple method invocation.

["Jeff Brasen" <jbrasen@nvidia.com>]

Add support to add Return objects via AML that pass a single integer
argument to the named method.

Signed-off-by: Jeff Brasen <jbrasen@nvidia.com>
Reviewed-by: Swatisri Kantamsetti <swatisrik@nvidia.com>
Reviewed-by: Ashish Singhal <ashishsingha@nvidia.com>
---
 .../Include/Library/AmlLib/AmlLib.h           |  54 +++++
 .../Common/AmlLib/CodeGen/AmlCodeGen.c        | 224 ++++++++++++++++++
 2 files changed, 278 insertions(+)

diff --git a/DynamicTablesPkg/Include/Library/AmlLib/AmlLib.h b/DynamicTablesPkg/Include/Library/AmlLib/AmlLib.h
index d201ae9499..b82c7a3ce8 100644
--- a/DynamicTablesPkg/Include/Library/AmlLib/AmlLib.h
+++ b/DynamicTablesPkg/Include/Library/AmlLib/AmlLib.h
@@ -1194,6 +1194,60 @@ AmlCodeGenMethodRetInteger (
   OUT       AML_OBJECT_NODE_HANDLE  *NewObjectNode        OPTIONAL
   );
 
+/** AML code generation for a method returning a NameString that takes an
+    integer argument.
+
+  AmlCodeGenMethodRetNameStringIntegerArgument (
+    "MET0", "MET1", 1, TRUE, 3, 5, ParentNode, NewObjectNode
+    );
+  is equivalent of the following ASL code:
+    Method(MET0, 1, Serialized, 3) {
+      Return (MET1 (5))
+    }
+
+  The ASL parameters "ReturnType" and "ParameterTypes" are not asked
+  in this function. They are optional parameters in ASL.
+
+  @param [in]  MethodNameString     The new Method's name.
+                                    Must be a NULL-terminated ASL NameString
+                                    e.g.: "MET0", "_SB.MET0", etc.
+                                    The input string is copied.
+  @param [in]  ReturnedNameString   The name of the object returned by the
+                                    method. Optional parameter, can be:
+                                     - NULL (ignored).
+                                     - A NULL-terminated ASL NameString.
+                                       e.g.: "MET0", "_SB.MET0", etc.
+                                       The input string is copied.
+  @param [in]  NumArgs              Number of arguments.
+                                    Must be 0 <= NumArgs <= 6.
+  @param [in]  IsSerialized         TRUE is equivalent to Serialized.
+                                    FALSE is equivalent to NotSerialized.
+                                    Default is NotSerialized in ASL spec.
+  @param [in]  SyncLevel            Synchronization level for the method.
+                                    Must be 0 <= SyncLevel <= 15.
+                                    Default is 0 in ASL.
+  @param [in]  IntegerArgument      Argument to pass to the NameString.
+  @param [in]  ParentNode           If provided, set ParentNode as the parent
+                                    of the node created.
+  @param [out] NewObjectNode        If success, contains the created node.
+
+  @retval EFI_SUCCESS             Success.
+  @retval EFI_INVALID_PARAMETER   Invalid parameter.
+  @retval EFI_OUT_OF_RESOURCES    Failed to allocate memory.
+**/
+EFI_STATUS
+EFIAPI
+AmlCodeGenMethodRetNameStringIntegerArgument (
+  IN  CONST CHAR8                   *MethodNameString,
+  IN  CONST CHAR8                   *ReturnedNameString   OPTIONAL,
+  IN        UINT8                   NumArgs,
+  IN        BOOLEAN                 IsSerialized,
+  IN        UINT8                   SyncLevel,
+  IN        UINT64                  IntegerArgument,
+  IN        AML_NODE_HANDLE         ParentNode           OPTIONAL,
+  OUT       AML_OBJECT_NODE_HANDLE  *NewObjectNode        OPTIONAL
+  );
+
 /** Create a _LPI name.
 
   AmlCreateLpiNode ("_LPI", 0, 1, ParentNode, &LpiNode) is
diff --git a/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c b/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c
index 88537b7e2d..2b95839e4c 100644
--- a/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c
+++ b/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c
@@ -1881,6 +1881,118 @@ AmlCodeGenReturnInteger (
   return Status;
 }
 
+/** AML code generation for a Return object node,
+    returning the object as an input NameString with a integer argument.
+
+  AmlCodeGenReturn ("NAM1", 6, ParentNode, NewObjectNode) is
+  equivalent of the following ASL code:
+    Return(NAM1 (6))
+
+  The ACPI 6.3 specification, s20.2.5.3 "Type 1 Opcodes Encoding" states:
+    DefReturn := ReturnOp ArgObject
+    ReturnOp := 0xA4
+    ArgObject := TermArg => DataRefObject
+
+  Thus, the ReturnNode must be evaluated as a DataRefObject. It can
+  be a NameString referencing an object. As this CodeGen Api doesn't
+  do semantic checking, it is strongly advised to check the AML bytecode
+  generated by this function against an ASL compiler.
+
+  The ReturnNode must be generated inside a Method body scope.
+
+  @param [in]  NameString     The object referenced by this NameString
+                              is returned by the Return ASL statement.
+                              Must be a NULL-terminated ASL NameString
+                              e.g.: "NAM1", "_SB.NAM1", etc.
+                              The input string is copied.
+  @param [in]  Integer        Argument to pass to the NameString
+  @param [in]  ParentNode     If provided, set ParentNode as the parent
+                              of the node created.
+                              Must be a MethodOp node.
+  @param [out] NewObjectNode  If success, contains the created node.
+
+  @retval EFI_SUCCESS             Success.
+  @retval EFI_INVALID_PARAMETER   Invalid parameter.
+  @retval EFI_OUT_OF_RESOURCES    Failed to allocate memory.
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+AmlCodeGenReturnNameStringIntegerArgument (
+  IN  CONST CHAR8            *NameString,
+  IN        UINT64           Integer,
+  IN        AML_NODE_HEADER  *ParentNode      OPTIONAL,
+  OUT       AML_OBJECT_NODE  **NewObjectNode   OPTIONAL
+  )
+{
+  EFI_STATUS       Status;
+  AML_DATA_NODE    *DataNode;
+  AML_OBJECT_NODE  *IntNode;
+  CHAR8            *AmlNameString;
+  UINT32           AmlNameStringSize;
+  AML_OBJECT_NODE  *ObjectNode;
+
+  DataNode = NULL;
+  IntNode  = NULL;
+
+  Status = ConvertAslNameToAmlName (NameString, &AmlNameString);
+  if (EFI_ERROR (Status)) {
+    ASSERT (0);
+    return Status;
+  }
+
+  Status = AmlGetNameStringSize (AmlNameString, &AmlNameStringSize);
+  if (EFI_ERROR (Status)) {
+    ASSERT (0);
+    goto exit_handler;
+  }
+
+  Status = AmlCreateDataNode (
+             EAmlNodeDataTypeNameString,
+             (UINT8 *)AmlNameString,
+             AmlNameStringSize,
+             &DataNode
+             );
+  if (EFI_ERROR (Status)) {
+    ASSERT (0);
+    goto exit_handler;
+  }
+
+  Status = AmlCodeGenInteger (Integer, &IntNode);
+  if (EFI_ERROR (Status)) {
+    ASSERT (0);
+    return Status;
+  }
+
+  // AmlCodeGenReturn() deletes DataNode if error.
+  Status = AmlCodeGenReturn (
+             (AML_NODE_HEADER *)DataNode,
+             ParentNode,
+             &ObjectNode
+             );
+  ASSERT_EFI_ERROR (Status);
+
+  Status = AmlVarListAddTail (
+             (AML_NODE_HANDLE)ObjectNode,
+             (AML_NODE_HANDLE)IntNode
+             );
+  if (EFI_ERROR (Status)) {
+    ASSERT (0);
+    return Status;
+  }
+
+  if (NewObjectNode != 0) {
+    *NewObjectNode = ObjectNode;
+  }
+
+exit_handler:
+  if (AmlNameString != NULL) {
+    FreePool (AmlNameString);
+  }
+
+  return Status;
+}
+
 /** AML code generation for a method returning a NameString.
 
   AmlCodeGenMethodRetNameString (
@@ -1989,6 +2101,118 @@ error_handler:
   return Status;
 }
 
+/** AML code generation for a method returning a NameString that takes an
+    integer argument.
+
+  AmlCodeGenMethodRetNameStringIntegerArgument (
+    "MET0", "MET1", 1, TRUE, 3, 5, ParentNode, NewObjectNode
+    );
+  is equivalent of the following ASL code:
+    Method(MET0, 1, Serialized, 3) {
+      Return (MET1 (5))
+    }
+
+  The ASL parameters "ReturnType" and "ParameterTypes" are not asked
+  in this function. They are optional parameters in ASL.
+
+  @param [in]  MethodNameString     The new Method's name.
+                                    Must be a NULL-terminated ASL NameString
+                                    e.g.: "MET0", "_SB.MET0", etc.
+                                    The input string is copied.
+  @param [in]  ReturnedNameString   The name of the object returned by the
+                                    method. Optional parameter, can be:
+                                     - NULL (ignored).
+                                     - A NULL-terminated ASL NameString.
+                                       e.g.: "MET0", "_SB.MET0", etc.
+                                       The input string is copied.
+  @param [in]  NumArgs              Number of arguments.
+                                    Must be 0 <= NumArgs <= 6.
+  @param [in]  IsSerialized         TRUE is equivalent to Serialized.
+                                    FALSE is equivalent to NotSerialized.
+                                    Default is NotSerialized in ASL spec.
+  @param [in]  SyncLevel            Synchronization level for the method.
+                                    Must be 0 <= SyncLevel <= 15.
+                                    Default is 0 in ASL.
+  @param [in]  IntegerArgument      Argument to pass to the NameString.
+  @param [in]  ParentNode           If provided, set ParentNode as the parent
+                                    of the node created.
+  @param [out] NewObjectNode        If success, contains the created node.
+
+  @retval EFI_SUCCESS             Success.
+  @retval EFI_INVALID_PARAMETER   Invalid parameter.
+  @retval EFI_OUT_OF_RESOURCES    Failed to allocate memory.
+**/
+EFI_STATUS
+EFIAPI
+AmlCodeGenMethodRetNameStringIntegerArgument (
+  IN  CONST CHAR8                   *MethodNameString,
+  IN  CONST CHAR8                   *ReturnedNameString   OPTIONAL,
+  IN        UINT8                   NumArgs,
+  IN        BOOLEAN                 IsSerialized,
+  IN        UINT8                   SyncLevel,
+  IN        UINT64                  IntegerArgument,
+  IN        AML_NODE_HANDLE         ParentNode           OPTIONAL,
+  OUT       AML_OBJECT_NODE_HANDLE  *NewObjectNode        OPTIONAL
+  )
+{
+  EFI_STATUS              Status;
+  AML_OBJECT_NODE_HANDLE  MethodNode;
+
+  if ((MethodNameString == NULL)  ||
+      ((ParentNode == NULL) && (NewObjectNode == NULL)))
+  {
+    ASSERT (0);
+    return EFI_INVALID_PARAMETER;
+  }
+
+  // Create a Method named MethodNameString.
+  Status = AmlCodeGenMethod (
+             MethodNameString,
+             NumArgs,
+             IsSerialized,
+             SyncLevel,
+             NULL,
+             &MethodNode
+             );
+  if (EFI_ERROR (Status)) {
+    ASSERT (0);
+    return Status;
+  }
+
+  // Return ReturnedNameString if provided.
+  if (ReturnedNameString != NULL) {
+    Status = AmlCodeGenReturnNameStringIntegerArgument (
+               ReturnedNameString,
+               IntegerArgument,
+               (AML_NODE_HANDLE)MethodNode,
+               NULL
+               );
+    if (EFI_ERROR (Status)) {
+      ASSERT (0);
+      goto error_handler;
+    }
+  }
+
+  Status = LinkNode (
+             MethodNode,
+             ParentNode,
+             NewObjectNode
+             );
+  if (EFI_ERROR (Status)) {
+    ASSERT (0);
+    goto error_handler;
+  }
+
+  return Status;
+
+error_handler:
+  if (MethodNode != NULL) {
+    AmlDeleteTree ((AML_NODE_HANDLE)MethodNode);
+  }
+
+  return Status;
+}
+
 /** AML code generation for a method returning an Integer.
 
   AmlCodeGenMethodRetInteger (
-- 
2.25.1