diff options
| -rw-r--r-- | DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c b/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c index a4cd2502dc..da80e9d77c 100644 --- a/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c +++ b/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c @@ -12,6 +12,7 @@ #include <AmlCoreInterface.h>
#include <AmlEncoding/Aml.h>
+#include <CodeGen/AmlResourceDataCodeGen.h>
#include <Tree/AmlNode.h>
#include <Tree/AmlTree.h>
#include <String/AmlString.h>
@@ -316,6 +317,195 @@ error_handler: return Status;
}
+/** AML code generation for a Buffer object node.
+
+ To create a Buffer object node with an empty buffer,
+ call the function with (Buffer=NULL, BufferSize=0).
+
+ @param [in] Buffer Buffer to set for the created Buffer
+ object node. The Buffer's content is copied.
+ NULL if there is no buffer to set for
+ the Buffer node.
+ @param [in] BufferSize Size of the Buffer.
+ 0 if there is no buffer to set for
+ the Buffer node.
+ @param [out] NewObjectNode If success, contains the created
+ Buffer object node.
+
+ @retval EFI_SUCCESS Success.
+ @retval EFI_INVALID_PARAMETER Invalid parameter.
+ @retval EFI_OUT_OF_RESOURCES Failed to allocate memory.
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+AmlCodeGenBuffer (
+ IN CONST UINT8 * Buffer, OPTIONAL
+ IN UINT32 BufferSize, OPTIONAL
+ OUT AML_OBJECT_NODE ** NewObjectNode
+ )
+{
+ EFI_STATUS Status;
+ AML_OBJECT_NODE * BufferNode;
+ AML_OBJECT_NODE * BufferSizeNode;
+ UINT32 BufferSizeNodeSize;
+ AML_DATA_NODE * DataNode;
+ UINT32 PkgLen;
+
+ // Buffer and BufferSize must be either both set, or both clear.
+ if ((NewObjectNode == NULL) ||
+ ((Buffer == NULL) != (BufferSize == 0))) {
+ ASSERT (0);
+ return EFI_INVALID_PARAMETER;
+ }
+
+ BufferNode = NULL;
+ DataNode = NULL;
+
+ // Cf ACPI 6.3 specification, s20.2.5.4 "Type 2 Opcodes Encoding"
+ // DefBuffer := BufferOp PkgLength BufferSize ByteList
+ // BufferOp := 0x11
+ // BufferSize := TermArg => Integer
+
+ Status = AmlCodeGenInteger (BufferSize, &BufferSizeNode);
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ return Status;
+ }
+
+ // Get the number of bytes required to encode the BufferSizeNode.
+ Status = AmlComputeSize (
+ (AML_NODE_HEADER*)BufferSizeNode,
+ &BufferSizeNodeSize
+ );
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler;
+ }
+
+ // Compute the size to write in the PkgLen.
+ Status = AmlComputePkgLength (BufferSizeNodeSize + BufferSize, &PkgLen);
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler;
+ }
+
+ // Create an object node for the buffer.
+ Status = AmlCreateObjectNode (
+ AmlGetByteEncodingByOpCode (AML_BUFFER_OP, 0),
+ PkgLen,
+ &BufferNode
+ );
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler;
+ }
+
+ // Set the BufferSizeNode as a fixed argument of the BufferNode.
+ Status = AmlSetFixedArgument (
+ BufferNode,
+ EAmlParseIndexTerm0,
+ (AML_NODE_HEADER*)BufferSizeNode
+ );
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler;
+ }
+
+ // BufferSizeNode is now attached.
+ BufferSizeNode = NULL;
+
+ // If there is a buffer, create a DataNode and attach it to the BufferNode.
+ if (Buffer != NULL) {
+ Status = AmlCreateDataNode (
+ EAmlNodeDataTypeRaw,
+ Buffer,
+ BufferSize,
+ &DataNode
+ );
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler;
+ }
+
+ Status = AmlVarListAddTail (
+ (AML_NODE_HEADER*)BufferNode,
+ (AML_NODE_HEADER*)DataNode
+ );
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ goto error_handler;
+ }
+ }
+
+ *NewObjectNode = BufferNode;
+ return Status;
+
+error_handler:
+ if (BufferSizeNode != NULL) {
+ AmlDeleteTree ((AML_NODE_HEADER*)BufferSizeNode);
+ }
+ if (BufferNode != NULL) {
+ AmlDeleteTree ((AML_NODE_HEADER*)BufferNode);
+ }
+ if (DataNode != NULL) {
+ AmlDeleteTree ((AML_NODE_HEADER*)DataNode);
+ }
+ return Status;
+}
+
+/** AML code generation for a ResourceTemplate.
+
+ "ResourceTemplate" is a macro defined in ACPI 6.3, s19.3.3
+ "ASL Resource Templates". It allows to store resource data elements.
+
+ In AML, a ResourceTemplate is implemented as a Buffer storing resource
+ data elements. An EndTag resource data descriptor must be at the end
+ of the list of resource data elements.
+ This function generates a Buffer node with an EndTag resource data
+ descriptor. It can be seen as an empty list of resource data elements.
+
+ @param [out] NewObjectNode If success, contains the created
+ ResourceTemplate object node.
+
+ @retval EFI_SUCCESS Success.
+ @retval EFI_INVALID_PARAMETER Invalid parameter.
+ @retval EFI_OUT_OF_RESOURCES Failed to allocate memory.
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+AmlCodeGenResourceTemplate (
+ OUT AML_OBJECT_NODE ** NewObjectNode
+ )
+{
+ EFI_STATUS Status;
+ AML_OBJECT_NODE * BufferNode;
+
+ if (NewObjectNode == NULL) {
+ ASSERT (0);
+ return EFI_INVALID_PARAMETER;
+ }
+
+ // Create a BufferNode with an empty buffer.
+ Status = AmlCodeGenBuffer (NULL, 0, &BufferNode);
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ return Status;
+ }
+
+ // Create an EndTag resource data element and attach it to the Buffer.
+ Status = AmlCodeGenEndTag (0, BufferNode, NULL);
+ if (EFI_ERROR (Status)) {
+ ASSERT (0);
+ AmlDeleteTree ((AML_NODE_HEADER*)BufferNode);
+ return Status;
+ }
+
+ *NewObjectNode = BufferNode;
+ return Status;
+}
+
/** AML code generation for a Name object node.
@param [in] NameString The new variable name.
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