DynamicTablesPkg: AML Code generation to invoke a method
Adds API to generate AML code to invoke/call another method. Also provides ability to pass arguments of type integer, string, ArgObj or LocalObj. Cc: Pierre Gondois <pierre.gondois@arm.com> Cc: Sami Mujawar <sami.mujawar@arm.com> Signed-off-by: Abdul Lateef Attar <AbdulLateef.Attar@amd.com> Reviewed-by: Pierre Gondois <pierre.gondois@arm.com> Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>
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Abdul Lateef Attar
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@ -2,6 +2,7 @@
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AML Code Generation.
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Copyright (c) 2020 - 2022, Arm Limited. All rights reserved.<BR>
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Copyright (C) 2023 Advanced Micro Devices, Inc. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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@ -3849,3 +3850,243 @@ exit_handler:
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return Status;
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}
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/** AML code generation to invoke/call another method.
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This method is a subset implementation of MethodInvocation
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defined in the ACPI specification 6.5,
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section 20.2.5 "Term Objects Encoding".
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Added integer, string, ArgObj and LocalObj support.
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Example 1:
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AmlCodeGenInvokeMethod ("MET0", 0, NULL, ParentNode);
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is equivalent to the following ASL code:
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MET0 ();
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Example 2:
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AML_METHOD_PARAM Param[4];
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Param[0].Data.Integer = 0x100;
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Param[0].Type = AmlMethodParamTypeInteger;
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Param[1].Data.Buffer = "TEST";
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Param[1].Type = AmlMethodParamTypeString;
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Param[2].Data.Arg = 0;
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Param[2].Type = AmlMethodParamTypeArg;
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Param[3].Data.Local = 2;
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Param[3].Type = AmlMethodParamTypeLocal;
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AmlCodeGenInvokeMethod ("MET0", 4, Param, ParentNode);
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is equivalent to the following ASL code:
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MET0 (0x100, "TEST", Arg0, Local2);
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Example 3:
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AML_METHOD_PARAM Param[2];
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Param[0].Data.Arg = 0;
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Param[0].Type = AmlMethodParamTypeArg;
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Param[1].Data.Integer = 0x100;
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Param[1].Type = AmlMethodParamTypeInteger;
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AmlCodeGenMethodRetNameString ("MET2", NULL, 2, TRUE, 0,
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ParentNode, &MethodNode);
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AmlCodeGenInvokeMethod ("MET3", 2, Param, MethodNode);
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is equivalent to the following ASL code:
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Method (MET2, 2, Serialized)
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{
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MET3 (Arg0, 0x0100)
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}
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@param [in] MethodNameString The method name to be called or invoked.
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@param [in] NumArgs Number of arguments to be passed,
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0 to 7 are permissible values.
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@param [in] Parameters Contains the parameter data.
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@param [in] ParentNode The parent node to which the method invocation
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nodes are attached.
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@retval EFI_SUCCESS Success.
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@retval EFI_INVALID_PARAMETER Invalid parameter.
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@retval EFI_OUT_OF_RESOURCES Failed to allocate memory.
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**/
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EFI_STATUS
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EFIAPI
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AmlCodeGenInvokeMethod (
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IN CONST CHAR8 *MethodNameString,
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IN UINT8 NumArgs,
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IN AML_METHOD_PARAM *Parameters OPTIONAL,
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IN AML_NODE_HANDLE ParentNode
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)
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{
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EFI_STATUS Status;
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UINT8 Index;
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CHAR8 *AmlNameString;
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UINT32 AmlNameStringSize;
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AML_DATA_NODE *DataNode;
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AML_OBJECT_NODE *ObjectNode;
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AML_NODE_HANDLE *NodeStream;
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if ((MethodNameString == NULL) || (ParentNode == NULL)) {
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ASSERT (0);
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return EFI_INVALID_PARAMETER;
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}
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if ((NumArgs > 7) ||
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((Parameters == NULL) && (NumArgs > 0)))
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{
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ASSERT (0);
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return EFI_INVALID_PARAMETER;
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}
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/// Allocate space to store methodname, object, data node pointers
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NodeStream = AllocateZeroPool (sizeof (AML_NODE_HANDLE) * (NumArgs + 1));
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if (NodeStream == NULL) {
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ASSERT (0);
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return EFI_OUT_OF_RESOURCES;
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}
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/// Create a called or invoked method name string.
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Status = ConvertAslNameToAmlName (MethodNameString, &AmlNameString);
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if (EFI_ERROR (Status)) {
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ASSERT_EFI_ERROR (Status);
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goto exit_handler;
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}
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Status = AmlGetNameStringSize (AmlNameString, &AmlNameStringSize);
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if (EFI_ERROR (Status)) {
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ASSERT_EFI_ERROR (Status);
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FreePool (AmlNameString);
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goto exit_handler;
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}
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DataNode = NULL;
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Status = AmlCreateDataNode (
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EAmlNodeDataTypeNameString,
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(UINT8 *)AmlNameString,
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AmlNameStringSize,
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&DataNode
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);
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FreePool (AmlNameString);
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if (EFI_ERROR (Status)) {
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ASSERT_EFI_ERROR (Status);
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goto exit_handler;
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}
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NodeStream[0] = (AML_NODE_HANDLE)DataNode;
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if (Parameters != NULL) {
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/// Validate and convert the Parameters to the stream of nodes.
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for (Index = 0; Index < NumArgs; Index++) {
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ObjectNode = NULL;
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switch (Parameters[Index].Type) {
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case AmlMethodParamTypeInteger:
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Status = AmlCodeGenInteger (
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Parameters[Index].Data.Integer,
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&ObjectNode
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);
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if (EFI_ERROR (Status)) {
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ASSERT_EFI_ERROR (Status);
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goto exit_handler;
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}
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break;
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case AmlMethodParamTypeString:
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if (Parameters[Index].Data.Buffer == NULL) {
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ASSERT_EFI_ERROR (EFI_INVALID_PARAMETER);
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Status = EFI_INVALID_PARAMETER;
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goto exit_handler;
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}
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Status = AmlCodeGenString (
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Parameters[Index].Data.Buffer,
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&ObjectNode
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);
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if (EFI_ERROR (Status)) {
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ASSERT_EFI_ERROR (Status);
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goto exit_handler;
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}
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break;
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case AmlMethodParamTypeArg:
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if (Parameters[Index].Data.Arg > (UINT8)(AML_ARG6 - AML_ARG0)) {
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ASSERT_EFI_ERROR (EFI_INVALID_PARAMETER);
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Status = EFI_INVALID_PARAMETER;
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goto exit_handler;
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}
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Status = AmlCreateObjectNode (
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AmlGetByteEncodingByOpCode (
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AML_ARG0 + Parameters[Index].Data.Arg,
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0
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),
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0,
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&ObjectNode
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);
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if (EFI_ERROR (Status)) {
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ASSERT_EFI_ERROR (Status);
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goto exit_handler;
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}
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break;
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case AmlMethodParamTypeLocal:
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if (Parameters[Index].Data.Local > (UINT8)(AML_LOCAL7 - AML_LOCAL0)) {
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ASSERT_EFI_ERROR (EFI_INVALID_PARAMETER);
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Status = EFI_INVALID_PARAMETER;
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goto exit_handler;
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}
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Status = AmlCreateObjectNode (
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AmlGetByteEncodingByOpCode (
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AML_LOCAL0 + Parameters[Index].Data.Local,
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0
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),
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0,
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&ObjectNode
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);
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if (EFI_ERROR (Status)) {
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ASSERT_EFI_ERROR (Status);
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goto exit_handler;
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}
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break;
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default:
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ASSERT_EFI_ERROR (EFI_INVALID_PARAMETER);
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Status = EFI_INVALID_PARAMETER;
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goto exit_handler;
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} // switch
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// Link the Object Node in the Node Stream.
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NodeStream[Index + 1] = (AML_NODE_HANDLE)ObjectNode;
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} // for
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}
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/// Index <= NumArgs, because an additional method name was added.
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for (Index = 0; Index <= NumArgs; Index++) {
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Status = AmlVarListAddTail (
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(AML_NODE_HANDLE)ParentNode,
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(AML_NODE_HANDLE)NodeStream[Index]
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);
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if (EFI_ERROR (Status)) {
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ASSERT_EFI_ERROR (Status);
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goto exit_handler_detach;
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}
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}
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FreePool (NodeStream);
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return Status;
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exit_handler_detach:
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/// The index contains the last successful node attached.
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for ( ; Index > 0; Index--) {
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/// Index contains the node number that is failed for AmlVarListAddTail().
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/// Hence, start detaching from the last successful
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AmlDetachNode (NodeStream[Index-1]);
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}
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exit_handler:
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/// Index <= NumArgs, because an additional method name was added.
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for (Index = 0; Index <= NumArgs; Index++) {
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if (NodeStream[Index] != 0) {
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AmlDeleteTree (NodeStream[Index]);
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}
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}
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FreePool (NodeStream);
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return Status;
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}
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