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diff --git a/src/kern/freebsd/events.hh b/src/kern/freebsd/events.hh
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+/*
+ * Copyright (c) 2015 Ruslan Bukin <br@bsdpad.com>
+ * All rights reserved.
+ *
+ * This software was developed by the University of Cambridge Computer
+ * Laboratory as part of the CTSRD Project, with support from the UK Higher
+ * Education Innovation Fund (HEIF).
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __KERN_FREEBSD_EVENTS_HH__
+#define __KERN_FREEBSD_EVENTS_HH__
+
+#include "kern/system_events.hh"
+
+namespace FreeBSD {
+
+/** A class to skip udelay() and related calls in the kernel.
+ * This class has two additional parameters that take the argument to udelay and
+ * manipulated it to come up with ns and eventually ticks to quiesce for.
+ * See descriptions of argDivToNs and argMultToNs below.
+ */
+class UDelayEvent : public SkipFuncEvent
+{
+  private:
+    /** value to divide arg by to create ns. This is present beacues the linux
+     * kernel code sometime precomputes the first multiply that is done in
+     * udelay() if the parameter is a constant. We need to undo it so here is
+     * how. */
+    uint64_t argDivToNs;
+
+    /** value to multiple arg by to create ns. Nominally, this is 1000 to
+     * convert us to ns, but since linux can do some preprocessing of constant
+     * values something else might be required. */
+    uint64_t argMultToNs;
+
+  public:
+    UDelayEvent(PCEventQueue *q, const std::string &desc, Addr addr,
+            uint64_t mult, uint64_t div)
+        : SkipFuncEvent(q, desc, addr), argDivToNs(div), argMultToNs(mult) {}
+    virtual void process(ThreadContext *xc);
+};
+
+}
+
+#endif