acpi: add aml_call0() helper

it will help to call a method with 0 arguments
Signed-off-by: NIgor Mammedov <imammedo@redhat.com>
Reviewed-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
Reviewed-by: NMarcel Apfelbaum <marcel@redhat.com>

hw/acpi/aml-build.c

@@ -539,6 +539,14 @@ Aml *aml_notify(Aml *arg1, Aml *arg2)
     return var;
 }
 
+/* helper to call method with 1 argument */
+Aml *aml_call0(const char *method)
+{
+    Aml *var = aml_alloc();
+    build_append_namestring(var->buf, "%s", method);
+    return var;
+}
+
 /* helper to call method with 1 argument */
 Aml *aml_call1(const char *method, Aml *arg1)
 {

include/hw/acpi/aml-build.h

@@ -236,6 +236,7 @@ Aml *aml_increment(Aml *arg);
 Aml *aml_decrement(Aml *arg);
 Aml *aml_index(Aml *arg1, Aml *idx);
 Aml *aml_notify(Aml *arg1, Aml *arg2);
+Aml *aml_call0(const char *method);
 Aml *aml_call1(const char *method, Aml *arg1);
 Aml *aml_call2(const char *method, Aml *arg1, Aml *arg2);
 Aml *aml_call3(const char *method, Aml *arg1, Aml *arg2, Aml *arg3);