diff --git a/src/libCom/osi/os/vxWorks/osdMonotonic.c b/src/libCom/osi/os/vxWorks/osdMonotonic.c
new file mode 100644
index 000000000..6a7abadbf
--- /dev/null
+++ b/src/libCom/osi/os/vxWorks/osdMonotonic.c
@@ -0,0 +1,92 @@
+/*************************************************************************\
+* Copyright (c) 2017 UChicago Argonne LLC, as Operator of Argonne
+*     National Laboratory.
+* EPICS BASE is distributed subject to a Software License Agreement found
+* in file LICENSE that is included with this distribution.
+\*************************************************************************/
+
+#define _VSB_CONFIG_FILE <../lib/h/config/vsbConfig.h>
+
+#include <vxWorks.h>
+
+#define EPICS_EXPOSE_LIBCOM_MONOTONIC_PRIVATE
+#include "epicsTypes.h"
+#include "epicsTime.h"
+#include "epicsFindSymbol.h"
+
+
+#define NS_PER_SEC 1000000000
+
+union timebase {
+    UINT32 u32[2];  /* vxTimeBaseGet() */
+    INT64 i64;      /* pentiumTscGet64() */
+    UINT64 u64;     /* epicsMonotonicGet() */
+};
+
+static epicsUInt64 ticksPerSec;
+
+
+#if CPU_FAMILY == PPC
+#include <arch/ppc/vxPpcLib.h>
+
+#define TIMEBASEGET(TB) \
+    vxTimeBaseGet(&TB.u32[0], &TB.u32[1])
+
+typedef epicsUInt64 (*sysTimeBaseFreq_t)(void);
+
+void osdMonotonicInit(void)
+{
+    sysTimeBaseFreq_t sysTimeBaseFreq =
+        (sysTimeBaseFreq_t) epicsFindSymbol("_sysTimeBaseFreq");
+
+    if (sysTimeBaseFreq) {
+        ticksPerSec = sysTimeBaseFreq();
+        return;
+    }
+
+    printf("Warning: BSP routine sysTimeBaseFreq() not found,\n"
+        "can't set up monotonic time source.\n");
+    ticksPerSec = 0;
+}
+
+
+#elif CPU_FAMILY == I80X86
+
+#include <arch/i86/pentiumLib.h>
+#include <hwif/cpu/arch/i86/vxCpuIdLib.h>
+
+#define TIMEBASEGET(TB) \
+    pentiumTscGet64(&TB.i64)
+
+void osdMonotonicInit(void)
+{
+    ticksPerSec = vxCpuIdGetFreq();
+
+    if (!ticksPerSec)
+        printf("Warning: Failed to set up monotonic time source.\n");
+}
+
+
+#else
+  #error CPU Family not supported yet!
+#endif
+
+
+epicsUInt64 epicsMonotonicResolution(void)
+{
+    if (!ticksPerSec)
+        return 0;
+
+    return NS_PER_SEC / ticksPerSec;
+}
+
+epicsUInt64 epicsMonotonicGet(void)
+{
+    union timebase tbNow;
+
+    if (!ticksPerSec)
+        return 0;
+
+    TIMEBASEGET(tbNow);
+    return tbNow.u64 / (ticksPerSec / NS_PER_SEC);
+}