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-/*
- * Copyright (c) 2005-2006 The Regents of The University of Michigan
- * All rights reserved.
- *
- * 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: Kevin Lim
- */
-
-#ifndef __CPU_O3_SAT_COUNTER_HH__
-#define __CPU_O3_SAT_COUNTER_HH__
-
-#include "base/misc.hh"
-#include "base/types.hh"
-
-/**
- * Private counter class for the internal saturating counters.
- * Implements an n bit saturating counter and provides methods to
- * increment, decrement, and read it.
- * @todo Consider making this something that more closely mimics a
- * built in class so you can use ++ or --.
- */
-class SatCounter
-{
- public:
- /**
- * Constructor for the counter.
- */
- SatCounter()
- : initialVal(0), counter(0)
- { }
-
- /**
- * Constructor for the counter.
- * @param bits How many bits the counter will have.
- */
- SatCounter(unsigned bits)
- : initialVal(0), maxVal((1 << bits) - 1), counter(0)
- { }
-
- /**
- * Constructor for the counter.
- * @param bits How many bits the counter will have.
- * @param initial_val Starting value for each counter.
- */
- SatCounter(unsigned bits, uint8_t initial_val)
- : initialVal(initial_val), maxVal((1 << bits) - 1),
- counter(initial_val)
- {
- // Check to make sure initial value doesn't exceed the max
- // counter value.
- if (initial_val > maxVal) {
- fatal("BP: Initial counter value exceeds max size.");
- }
- }
-
- /**
- * Sets the number of bits.
- */
- void setBits(unsigned bits) { maxVal = (1 << bits) - 1; }
-
- void reset() { counter = initialVal; }
-
- /**
- * Increments the counter's current value.
- */
- void increment()
- {
- if (counter < maxVal) {
- ++counter;
- }
- }
-
- /**
- * Decrements the counter's current value.
- */
- void decrement()
- {
- if (counter > 0) {
- --counter;
- }
- }
-
- /**
- * Read the counter's value.
- */
- const uint8_t read() const
- { return counter; }
-
- private:
- uint8_t initialVal;
- uint8_t maxVal;
- uint8_t counter;
-};
-
-#endif // __CPU_O3_SAT_COUNTER_HH__