From: Pierre Gondois <pierre.gond...@arm.com>
Add AmlCodeGenReturnNameString() to generate AML code for a
Return object node, returning the object as a NameString.
AmlCodeGenReturn ("NAM1", ParentNode, NewObjectNode) is
equivalent of the following ASL code:
Return(NAM1)
Signed-off-by: Pierre Gondois <pierre.gond...@arm.com>
---
.../Common/AmlLib/CodeGen/AmlCodeGen.c | 178 ++++++++++++++++++
1 file changed, 178 insertions(+)
diff --git a/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c
b/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c
index 32665f7f8d8f..75dadbaf4ac3 100644
--- a/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c
+++ b/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c
@@ -1137,3 +1137,181 @@ error_handler1:
}
return Status;
}
+
+/** AML code generation for a Return object node.
+
+ AmlCodeGenReturn (ReturnNode, ParentNode, NewObjectNode) is
+ equivalent of the following ASL code:
+ Return([Content of the ReturnNode])
+
+ 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] ReturnNode The object returned by the Return ASL statement.
+ This node is deleted if an error occurs.
+ @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.
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+AmlCodeGenReturn (
+ IN AML_NODE_HEADER * ReturnNode,
+ IN AML_NODE_HEADER * ParentNode, OPTIONAL
+ OUT AML_OBJECT_NODE ** NewObjectNode OPTIONAL
+ )
+{
+ EFI_STATUS Status;
+ AML_OBJECT_NODE * ObjectNode;
+
+ if ((ReturnNode == NULL) ||
+ ((ParentNode == NULL) && (NewObjectNode == NULL))) {
+ ASSERT (0);
+ return EFI_INVALID_PARAMETER;
+ }
+
+ ObjectNode = NULL;
+
+ Status = AmlCreateObjectNode (
+ AmlGetByteEncodingByOpCode (AML_RETURN_OP, 0),
+ 0,
+ &ObjectNode
+ );
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler;
+ }
+
+ Status = AmlSetFixedArgument (
+ ObjectNode,
+ EAmlParseIndexTerm0,
+ (AML_NODE_HEADER*)ReturnNode
+ );
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler;
+ }
+
+ ReturnNode = NULL;
+
+ Status = LinkNode (
+ ObjectNode,
+ ParentNode,
+ NewObjectNode
+ );
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler;
+ }
+
+ return Status;
+
+error_handler:
+ AmlDeleteTree (ReturnNode);
+ if (ObjectNode != NULL) {
+ AmlDeleteTree ((AML_NODE_HEADER*)ObjectNode);
+ }
+ return Status;
+}
+
+/** AML code generation for a Return object node,
+ returning the object as an input NameString.
+
+ AmlCodeGenReturn ("NAM1", ParentNode, NewObjectNode) is
+ equivalent of the following ASL code:
+ Return(NAM1)
+
+ 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] 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.
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+AmlCodeGenReturnNameString (
+ IN CONST CHAR8 * NameString,
+ IN AML_NODE_HEADER * ParentNode, OPTIONAL
+ OUT AML_OBJECT_NODE ** NewObjectNode OPTIONAL
+ )
+{
+ EFI_STATUS Status;
+ AML_DATA_NODE * DataNode;
+ CHAR8 * AmlNameString;
+ UINT32 AmlNameStringSize;
+
+ DataNode = 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;
+ }
+
+ // AmlCodeGenReturn() deletes DataNode if error.
+ Status = AmlCodeGenReturn (
+ (AML_NODE_HEADER*)DataNode,
+ ParentNode,
+ NewObjectNode
+ );
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ }
+
+exit_handler:
+ if (AmlNameString != NULL) {
+ FreePool (AmlNameString);
+ }
+ return Status;
+}
--
2.17.1
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