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/*
* Copyright (c) 1999-2008 Mark D. Hill and David A. Wood
* 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.
*/
/*
* $Id$
*/
#include "Global.hh"
#include "TimerTable.hh"
#include "RubyEventQueue.hh"
TimerTable::TimerTable(Chip* chip_ptr)
{
assert(chip_ptr != NULL);
m_consumer_ptr = NULL;
m_chip_ptr = chip_ptr;
m_next_valid = false;
m_next_address = Address(0);
m_next_time = 0;
}
bool TimerTable::isReady() const
{
if (m_map.size() == 0) {
return false;
}
if (!m_next_valid) {
updateNext();
}
assert(m_next_valid);
return (g_eventQueue_ptr->getTime() >= m_next_time);
}
const Address& TimerTable::readyAddress() const
{
assert(isReady());
if (!m_next_valid) {
updateNext();
}
assert(m_next_valid);
return m_next_address;
}
void TimerTable::set(const Address& address, Time relative_latency)
{
assert(address == line_address(address));
assert(relative_latency > 0);
assert(m_map.exist(address) == false);
Time ready_time = g_eventQueue_ptr->getTime() + relative_latency;
m_map.add(address, ready_time);
assert(m_consumer_ptr != NULL);
g_eventQueue_ptr->scheduleEventAbsolute(m_consumer_ptr, ready_time);
m_next_valid = false;
// Don't always recalculate the next ready address
if (ready_time <= m_next_time) {
m_next_valid = false;
}
}
void TimerTable::unset(const Address& address)
{
assert(address == line_address(address));
assert(m_map.exist(address) == true);
m_map.remove(address);
// Don't always recalculate the next ready address
if (address == m_next_address) {
m_next_valid = false;
}
}
void TimerTable::print(ostream& out) const
{
}
void TimerTable::updateNext() const
{
if (m_map.size() == 0) {
assert(m_next_valid == false);
return;
}
Vector<Address> addresses = m_map.keys();
m_next_address = addresses[0];
m_next_time = m_map.lookup(m_next_address);
// Search for the minimum time
int size = addresses.size();
for (int i=1; i<size; i++) {
Address maybe_next_address = addresses[i];
Time maybe_next_time = m_map.lookup(maybe_next_address);
if (maybe_next_time < m_next_time) {
m_next_time = maybe_next_time;
m_next_address= maybe_next_address;
}
}
m_next_valid = true;
}
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