1 files changed, 118 insertions, 0 deletions
diff --git a/src/sim/clock_domain.cc b/src/sim/clock_domain.cc
new file mode 100644
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+++ b/src/sim/clock_domain.cc
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+/*
+ * Copyright (c) 2013 ARM Limited
+ * All rights reserved
+ *
+ * The license below extends only to copyright in the software and shall
+ * not be construed as granting a license to any other intellectual
+ * property including but not limited to intellectual property relating
+ * to a hardware implementation of the functionality of the software
+ * licensed hereunder.  You may use the software subject to the license
+ * terms below provided that you ensure that this notice is replicated
+ * unmodified and in its entirety in all distributions of the software,
+ * modified or unmodified, in source code or in binary form.
+ *
+ * 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.
+ *
+ * Authors: Vasileios Spiliopoulos
+ *          Akash Bagdia
+ *          Andreas Hansson
+ */
+
+#include "debug/ClockDomain.hh"
+#include "params/ClockDomain.hh"
+#include "params/DerivedClockDomain.hh"
+#include "params/SrcClockDomain.hh"
+#include "sim/clock_domain.hh"
+
+SrcClockDomain::SrcClockDomain(const Params *p) : ClockDomain(p)
+{
+    clockPeriod(p->clock);
+}
+
+void
+SrcClockDomain::clockPeriod(Tick clock_period)
+{
+    if (clock_period == 0) {
+        fatal("%s has a clock period of zero\n", name());
+    }
+
+    _clockPeriod = clock_period;
+
+    DPRINTF(ClockDomain,
+            "Setting clock period to %d ticks for source clock %s\n",
+            _clockPeriod, name());
+
+    // inform any derived clocks they need to updated their period
+    for (auto c = children.begin(); c != children.end(); ++c) {
+        (*c)->updateClockPeriod();
+    }
+}
+
+SrcClockDomain *
+SrcClockDomainParams::create()
+{
+    return new SrcClockDomain(this);
+}
+
+DerivedClockDomain::DerivedClockDomain(const Params *p) :
+    ClockDomain(p),
+    parent(*p->clk_domain),
+    clockDivider(p->clk_divider)
+{
+    // Ensure that clock divider setting works as frequency divider and never
+    // work as frequency multiplier
+    if (clockDivider < 1) {
+       fatal("Clock divider param cannot be less than 1");
+    }
+
+    // let the parent keep track of this derived domain so that it can
+    // propagate changes
+    parent.addDerivedDomain(this);
+
+    // update our clock period based on the parents clock
+    updateClockPeriod();
+}
+
+void
+DerivedClockDomain::updateClockPeriod()
+{
+    // recalculate the clock period, relying on the fact that changes
+    // propagate downwards in the tree
+    _clockPeriod = parent.clockPeriod() * clockDivider;
+
+    DPRINTF(ClockDomain,
+            "Setting clock period to %d ticks for derived clock %s\n",
+            _clockPeriod, name());
+
+    // inform any derived clocks
+    for (auto c = children.begin(); c != children.end(); ++c) {
+        (*c)->updateClockPeriod();
+    }
+}
+
+DerivedClockDomain *
+DerivedClockDomainParams::create()
+{
+    return new DerivedClockDomain(this);
+}