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diff --git a/generic/viaduct_constids.h b/generic/viaduct_constids.h
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+/*
+ *  nextpnr -- Next Generation Place and Route
+ *
+ *  Copyright (C) 2021  gatecat <gatecat@ds0.me>
+ *
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#ifndef VIADUCT_CONSTIDS_H
+#define VIADUCT_CONSTIDS_H
+
+/*
+This enables use of 'constids' similar to a 'true' nextpnr arch in a viaduct uarch.
+To use:
+    - create a 'constids.inc' file in your uarch folder containing one ID per line; inside X( )
+    - set the VIADUCT_CONSTIDS macro to the path to this file relative to the generic arch base
+    - in your main file; also define GEN_INIT_CONSTIDS to create init_uarch_constids(Context*) which you should call in
+init
+    - include this file
+*/
+
+#include "nextpnr_namespaces.h"
+
+#ifdef VIADUCT_MAIN
+#include "idstring.h"
+#endif
+
+NEXTPNR_NAMESPACE_BEGIN
+
+namespace {
+#ifndef Q_MOC_RUN
+enum ConstIds
+{
+    ID_NONE
+#define X(t) , ID_##t
+#include VIADUCT_CONSTIDS
+#undef X
+    ,
+};
+
+#define X(t) static constexpr auto id_##t = IdString(ID_##t);
+#include VIADUCT_CONSTIDS
+#undef X
+#endif
+
+#ifdef GEN_INIT_CONSTIDS
+
+void init_uarch_constids(Context *ctx)
+{
+#define X(t) IdString::initialize_add(ctx, #t, ID_##t);
+
+#include VIADUCT_CONSTIDS
+
+#undef X
+}
+
+#endif
+
+} // namespace
+
+NEXTPNR_NAMESPACE_END
+
+#endif