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diff --git a/gowin/globals.h b/gowin/globals.h
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+/*
+ *  nextpnr -- Next Generation Place and Route
+ *
+ *  Copyright (C) 2018  gatecat <gatecat@ds0.me>
+ *  Copyright (C) 2022  YRabbit <rabbit@yrabbit.cyou>
+ *
+ *  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 GOWIN_GLOBALS_H
+#define GOWIN_GLOBALS_H
+
+#include "nextpnr.h"
+
+NEXTPNR_NAMESPACE_BEGIN
+
+class GowinGlobalRouter
+{
+  public:
+    GowinGlobalRouter() {}
+
+  private:
+    // wire -> clock#
+    dict<WireId, int> used_wires;
+
+    // ordered nets
+    struct globalnet_t
+    {
+        IdString name;
+        int clock_ports;
+        BelId clock_io_bel;
+        WireId clock_io_wire; // IO wire if there is one
+        int clock;            // clock #
+
+        globalnet_t()
+        {
+            name = IdString();
+            clock_ports = 0;
+            clock_io_bel = BelId();
+            clock_io_wire = WireId();
+            clock = -1;
+        }
+        globalnet_t(IdString _name)
+        {
+            name = _name;
+            clock_ports = 0;
+            clock_io_bel = BelId();
+            clock_io_wire = WireId();
+            clock = -1;
+        }
+
+        // sort
+        bool operator<(const globalnet_t &other) const
+        {
+            if ((clock_io_wire != WireId()) ^ (other.clock_io_wire != WireId())) {
+                return !(clock_io_wire != WireId());
+            }
+            return clock_ports < other.clock_ports;
+        }
+        // search
+        bool operator==(const globalnet_t &other) const { return name == other.name; }
+    };
+
+    // discovered nets
+    std::vector<globalnet_t> nets;
+
+    bool is_clock_port(PortRef const &user);
+    std::pair<WireId, BelId> clock_io(Context *ctx, PortRef const &driver);
+    void gather_clock_nets(Context *ctx, std::vector<globalnet_t> &clock_nets);
+    IdString route_to_non_clock_port(Context *ctx, WireId const dstWire, int clock, pool<IdString> &used_pips,
+                                     pool<IdString> &undo_wires);
+    void route_net(Context *ctx, globalnet_t const &net);
+
+  public:
+    void mark_globals(Context *ctx);
+    void route_globals(Context *ctx);
+};
+
+NEXTPNR_NAMESPACE_END
+#endif // GOWIN_GLOBALS_H