Hi Pierre,
Thank you for adding documentation for the steps for generating a Method.
Reviewed-by: Sami Mujawar <sami.muja...@arm.com>
Regards,
Sami Mujawar
On 07/10/2021 04:32 PM, pierre.gond...@arm.com wrote:
From: Pierre Gondois <pierre.gond...@arm.com>
Add AmlCodeGenMethod() to generate code for a control method.
AmlCodeGenMethod ("MET0", 1, TRUE, 3, ParentNode, NewObjectNode)
is equivalent of the following ASL code:
Method(MET0, 1, Serialized, 3) {}
Signed-off-by: Pierre Gondois <pierre.gond...@arm.com>
---
.../Common/AmlLib/CodeGen/AmlCodeGen.c | 184 ++++++++++++++++++
1 file changed, 184 insertions(+)
diff --git a/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c
b/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c
index da80e9d77cc2..dd519bc67007 100644
--- a/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c
+++ b/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c
@@ -970,3 +970,187 @@ error_handler1:
return Status;
}
+
+/** AML code generation for a Method object node.
+
+ AmlCodeGenMethod ("MET0", 1, TRUE, 3, ParentNode, NewObjectNode) is
+ equivalent of the following ASL code:
+ Method(MET0, 1, Serialized, 3) {}
+
+ ACPI 6.4, s20.2.5.2 "Named Objects Encoding":
+ DefMethod := MethodOp PkgLength NameString MethodFlags TermList
+ MethodOp := 0x14
+
+ The ASL parameters "ReturnType" and "ParameterTypes" are not asked
+ in this function. They are optional parameters in ASL.
+
+ @param [in] NameString 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] 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] 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
+AmlCodeGenMethod (
+ IN CONST CHAR8 * NameString,
+ IN UINT8 NumArgs,
+ IN BOOLEAN IsSerialized,
+ IN UINT8 SyncLevel,
+ IN AML_NODE_HEADER * ParentNode, OPTIONAL
+ OUT AML_OBJECT_NODE ** NewObjectNode OPTIONAL
+ )
+{
+ EFI_STATUS Status;
+ UINT32 PkgLen;
+ UINT8 Flags;
+ AML_OBJECT_NODE * ObjectNode;
+ AML_DATA_NODE * DataNode;
+ CHAR8 * AmlNameString;
+ UINT32 AmlNameStringSize;
+
+ if ((NameString == NULL) ||
+ (NumArgs > 6) ||
+ (SyncLevel > 15) ||
+ ((ParentNode == NULL) && (NewObjectNode == NULL))) {
+ ASSERT (0);
+ return EFI_INVALID_PARAMETER;
+ }
+
+ ObjectNode = NULL;
+ DataNode = NULL;
+
+ // ACPI 6.4, s20.2.5.2 "Named Objects Encoding":
+ // DefMethod := MethodOp PkgLength NameString MethodFlags TermList
+ // MethodOp := 0x14
+ // So:
+ // 1- Create the NameString
+ // 2- Compute the size to write in the PkgLen
+ // 3- Create nodes for the NameString and Method object node
+ // 4- Set the NameString DataNode as a fixed argument
+ // 5- Create and link the MethodFlags node
+
+ // 1- Create the NameString
+ Status = ConvertAslNameToAmlName (NameString, &AmlNameString);
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ return Status;
+ }
+
+ Status = AmlGetNameStringSize (AmlNameString, &AmlNameStringSize);
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler1;
+ }
+
+ // 2- Compute the size to write in the PkgLen
+ // Add 1 byte (ByteData) for MethodFlags.
+ Status = AmlComputePkgLength (AmlNameStringSize + 1, &PkgLen);
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler1;
+ }
+
+ // 3- Create nodes for the NameString and Method object node
+ Status = AmlCreateObjectNode (
+ AmlGetByteEncodingByOpCode (AML_METHOD_OP, 0),
+ PkgLen,
+ &ObjectNode
+ );
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler1;
+ }
+
+ Status = AmlCreateDataNode (
+ EAmlNodeDataTypeNameString,
+ (UINT8*)AmlNameString,
+ AmlNameStringSize,
+ &DataNode
+ );
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler2;
+ }
+
+ // 4- Set the NameString DataNode as a fixed argument
+ Status = AmlSetFixedArgument (
+ ObjectNode,
+ EAmlParseIndexTerm0,
+ (AML_NODE_HEADER*)DataNode
+ );
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler2;
+ }
+
+ DataNode = NULL;
+
+ // 5- Create and link the MethodFlags node
+ Flags = NumArgs |
+ (IsSerialized ? BIT3 : 0) |
+ (SyncLevel << 4);
+
+ Status = AmlCreateDataNode (EAmlNodeDataTypeUInt, &Flags, 1, &DataNode);
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler2;
+ }
+
+ Status = AmlSetFixedArgument (
+ ObjectNode,
+ EAmlParseIndexTerm1,
+ (AML_NODE_HEADER*)DataNode
+ );
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler2;
+ }
+
+ // Data node is attached so set the pointer to
+ // NULL to ensure correct error handling.
+ DataNode = NULL;
+
+ Status = LinkNode (
+ ObjectNode,
+ ParentNode,
+ NewObjectNode
+ );
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler2;
+ }
+
+ // Free AmlNameString before returning as it is copied
+ // in the call to AmlCreateDataNode().
+ goto error_handler1;
+
+error_handler2:
+ if (ObjectNode != NULL) {
+ AmlDeleteTree ((AML_NODE_HEADER*)ObjectNode);
+ }
+ if (DataNode != NULL) {
+ AmlDeleteTree ((AML_NODE_HEADER*)DataNode);
+ }
+
+error_handler1:
+ if (AmlNameString != NULL) {
+ FreePool (AmlNameString);
+ }
+ return Status;
+}
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