acpi: add aml_object_type

Implement ObjectType which is used by NVDIMM _DSM method in
later patch
Signed-off-by: NXiao Guangrong <guangrong.xiao@linux.intel.com>
Reviewed-by: NStefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>

hw/acpi/aml-build.c

@@ -1481,6 +1481,14 @@ Aml *aml_concatenate(Aml *source1, Aml *source2, Aml *target)
                                  target);
 }
 
+/* ACPI 1.0b: 16.2.5.4 Type 2 Opcodes Encoding: DefObjectType */
+Aml *aml_object_type(Aml *object)
+{
+    Aml *var = aml_opcode(0x8E /* ObjectTypeOp */);
+    aml_append(var, object);
+    return var;
+}
+
 void
 build_header(BIOSLinker *linker, GArray *table_data,
              AcpiTableHeader *h, const char *sig, int len, uint8_t rev,

include/hw/acpi/aml-build.h

@@ -363,6 +363,7 @@ Aml *aml_refof(Aml *arg);
 Aml *aml_derefof(Aml *arg);
 Aml *aml_sizeof(Aml *arg);
 Aml *aml_concatenate(Aml *source1, Aml *source2, Aml *target);
+Aml *aml_object_type(Aml *object);
 
 void
 build_header(BIOSLinker *linker, GArray *table_data,