DynamicTablesPkg: Add AddSsdtAcpiHeader()

To fetch the Oem information from the ConfigurationManagerProtocol
and the AcpiTableInfo, and populate the SSDT ACPI header when
creating a RootNode via the AmlLib, create AddSsdtAcpiHeader().

Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>
Signed-off-by: Pierre Gondois <Pierre.Gondois@arm.com>

DynamicTablesPkg/Include/Library/TableHelperLib.h

@@ -12,6 +12,8 @@
 #ifndef TABLE_HELPER_LIB_H_
 #define TABLE_HELPER_LIB_H_
 
+#include <Library/AmlLib/AmlLib.h>
+
 /** The GetCgfMgrInfo function gets the CM_STD_OBJ_CONFIGURATION_MANAGER_INFO
     object from the Configuration Manager.
 
@@ -62,6 +64,39 @@ AddAcpiHeader (
   IN      CONST UINT32                                        Length
   );
 
+/** Build a RootNode containing SSDT ACPI header information using the AmlLib.
+
+  The function utilizes the ACPI table Generator and the Configuration
+  Manager protocol to obtain any information required for constructing the
+  header. It then creates a RootNode. The SSDT ACPI header is part of the
+  RootNode.
+
+  This is essentially a wrapper around AmlCodeGenDefinitionBlock ()
+  from the AmlLib.
+
+  @param [in]   CfgMgrProtocol Pointer to the Configuration Manager
+                               protocol interface.
+  @param [in]   Generator      Pointer to the ACPI table Generator.
+  @param [in]   AcpiTableInfo  Pointer to the ACPI table info structure.
+  @param [out]  RootNode       If success, contains the created RootNode.
+                               The SSDT ACPI header is part of the RootNode.
+
+  @retval EFI_SUCCESS           Success.
+  @retval EFI_INVALID_PARAMETER A parameter is invalid.
+  @retval EFI_NOT_FOUND         The required object information is not found.
+  @retval EFI_BAD_BUFFER_SIZE   The size returned by the Configuration
+                                Manager is less than the Object size for the
+                                requested object.
+**/
+EFI_STATUS
+EFIAPI
+AddSsdtAcpiHeader (
+  IN      CONST EDKII_CONFIGURATION_MANAGER_PROTOCOL  * CONST CfgMgrProtocol,
+  IN      CONST ACPI_TABLE_GENERATOR                  * CONST Generator,
+  IN      CONST CM_STD_OBJ_ACPI_TABLE_INFO            * CONST AcpiTableInfo,
+      OUT       AML_ROOT_NODE_HANDLE                  *       RootNode
+  );
+
 /**
   Function prototype for testing if two arbitrary objects are equal.
 

DynamicTablesPkg/Library/Common/TableHelperLib/TableHelper.c

@@ -185,6 +185,93 @@ error_handler:
   return Status;
 }
 
+/** Build a RootNode containing SSDT ACPI header information using the AmlLib.
+
+  The function utilizes the ACPI table Generator and the Configuration
+  Manager protocol to obtain any information required for constructing the
+  header. It then creates a RootNode. The SSDT ACPI header is part of the
+  RootNode.
+
+  This is essentially a wrapper around AmlCodeGenDefinitionBlock ()
+  from the AmlLib.
+
+  @param [in]   CfgMgrProtocol Pointer to the Configuration Manager
+                               protocol interface.
+  @param [in]   Generator      Pointer to the ACPI table Generator.
+  @param [in]   AcpiTableInfo  Pointer to the ACPI table info structure.
+  @param [out]  RootNode       If success, contains the created RootNode.
+                               The SSDT ACPI header is part of the RootNode.
+
+  @retval EFI_SUCCESS           Success.
+  @retval EFI_INVALID_PARAMETER A parameter is invalid.
+  @retval EFI_NOT_FOUND         The required object information is not found.
+  @retval EFI_BAD_BUFFER_SIZE   The size returned by the Configuration
+                                Manager is less than the Object size for the
+                                requested object.
+**/
+EFI_STATUS
+EFIAPI
+AddSsdtAcpiHeader (
+  IN      CONST EDKII_CONFIGURATION_MANAGER_PROTOCOL  * CONST CfgMgrProtocol,
+  IN      CONST ACPI_TABLE_GENERATOR                  * CONST Generator,
+  IN      CONST CM_STD_OBJ_ACPI_TABLE_INFO            * CONST AcpiTableInfo,
+      OUT       AML_ROOT_NODE_HANDLE                  *       RootNode
+  )
+{
+  EFI_STATUS                               Status;
+  UINT64                                   OemTableId;
+  UINT32                                   OemRevision;
+  CM_STD_OBJ_CONFIGURATION_MANAGER_INFO  * CfgMfrInfo;
+
+  ASSERT (CfgMgrProtocol != NULL);
+  ASSERT (Generator != NULL);
+  ASSERT (AcpiTableInfo != NULL);
+
+  if ((CfgMgrProtocol == NULL)  ||
+      (Generator == NULL)       ||
+      (AcpiTableInfo == NULL)) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  Status = GetCgfMgrInfo (CfgMgrProtocol, &CfgMfrInfo);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((
+      DEBUG_ERROR,
+      "ERROR: Failed to get Configuration Manager info. Status = %r\n",
+      Status
+      ));
+    return Status;
+  }
+
+  if (AcpiTableInfo->OemTableId != 0) {
+    OemTableId = AcpiTableInfo->OemTableId;
+  } else {
+    OemTableId = SIGNATURE_32 (
+                   CfgMfrInfo->OemId[0],
+                   CfgMfrInfo->OemId[1],
+                   CfgMfrInfo->OemId[2],
+                   CfgMfrInfo->OemId[3]
+                   ) |
+                 ((UINT64)Generator->AcpiTableSignature << 32);
+  }
+
+  if (AcpiTableInfo->OemRevision != 0) {
+    OemRevision = AcpiTableInfo->OemRevision;
+  } else {
+    OemRevision = CfgMfrInfo->Revision;
+  }
+
+  Status = AmlCodeGenDefinitionBlock (
+             "SSDT",
+             (CONST CHAR8*)&CfgMfrInfo->OemId,
+             (CONST CHAR8*)&OemTableId,
+             OemRevision,
+             RootNode
+             );
+  ASSERT_EFI_ERROR (Status);
+  return Status;
+}
+
 /**
   Test and report if a duplicate entry exists in the given array of comparable
   elements.