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/*
* Copyright (c) 2004 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.
*/
/**
* @file
* Declaration of a memory trace CPU object for optimal caches. Uses a memory
* trace to access a fully associative cache with optimal replacement.
*/
#ifndef __OPT_CPU_HH__
#define __OPT_CPU_HH__
#include <vector>
#include "cpu/base_cpu.hh"
#include "mem/mem_req.hh" // for MemReqPtr
#include "sim/eventq.hh" // for Event
// Forward Declaration
class MemTraceReader;
/**
* A CPU object to simulate a fully-associative cache with optimal replacement.
*/
class OptCPU : public BaseCPU
{
typedef int RefIndex;
typedef std::vector<RefIndex> L3Table;
typedef std::vector<L3Table> L2Table;
typedef std::vector<L2Table> L1Table;
/**
* Event to call OptCPU::tick
*/
class TickEvent : public Event
{
private:
/** The associated CPU */
OptCPU *cpu;
public:
/**
* Construct this event;
*/
TickEvent(OptCPU *c);
/**
* Call the tick function.
*/
void process();
/**
* Return a string description of this event.
*/
const char *description();
};
TickEvent tickEvent;
class RefInfo
{
public:
RefIndex nextRefTime;
Addr addr;
};
/** Reference Information, per set. */
std::vector<std::vector<RefInfo> > refInfo;
/** Lookup table to track blocks in the cache heap */
L1Table lookupTable;
/**
* Return the correct value in the lookup table.
*/
RefIndex lookupValue(Addr addr)
{
int l1_index = (addr >> 32) & 0x0f;
int l2_index = (addr >> 16) & 0xffff;
int l3_index = addr & 0xffff;
assert(l1_index == addr >> 32);
return lookupTable[l1_index][l2_index][l3_index];
}
/**
* Set the value in the lookup table.
*/
void setValue(Addr addr, RefIndex index)
{
int l1_index = (addr >> 32) & 0x0f;
int l2_index = (addr >> 16) & 0xffff;
int l3_index = addr & 0xffff;
assert(l1_index == addr >> 32);
lookupTable[l1_index][l2_index][l3_index]=index;
}
/**
* Initialize the lookup table to the given value.
*/
void initTable(Addr addr, RefIndex index);
void heapSwap(int set, int a, int b) {
RefIndex tmp = cacheHeap[a];
cacheHeap[a] = cacheHeap[b];
cacheHeap[b] = tmp;
setValue(refInfo[set][cacheHeap[a]].addr, a);
setValue(refInfo[set][cacheHeap[b]].addr, b);
}
int heapLeft(int index) { return index + index + 1; }
int heapRight(int index) { return index + index + 2; }
int heapParent(int index) { return (index - 1) >> 1; }
RefIndex heapRank(int set, int index) {
return refInfo[set][cacheHeap[index]].nextRefTime;
}
void heapify(int set, int start){
int left = heapLeft(start);
int right = heapRight(start);
int max = start;
if (left < assoc && heapRank(set, left) > heapRank(set, start)) {
max = left;
}
if (right < assoc && heapRank(set, right) > heapRank(set, max)) {
max = right;
}
if (max != start) {
heapSwap(set, start, max);
heapify(set, max);
}
}
void verifyHeap(int set, int start) {
int left = heapLeft(start);
int right = heapRight(start);
if (left < assoc) {
assert(heapRank(set, start) >= heapRank(set, left));
verifyHeap(set, left);
}
if (right < assoc) {
assert(heapRank(set, start) >= heapRank(set, right));
verifyHeap(set, right);
}
}
void processRankIncrease(int set, int start) {
int parent = heapParent(start);
while (start > 0 && heapRank(set,parent) < heapRank(set,start)) {
heapSwap(set, parent, start);
start = parent;
parent = heapParent(start);
}
}
void processSet(int set);
static const RefIndex InfiniteRef = 0x7fffffff;
/** Memory reference trace. */
MemTraceReader *trace;
/** Cache heap for replacement. */
std::vector<RefIndex> cacheHeap;
/** The number of blocks in the cache. */
const int numBlks;
const int assoc;
const int numSets;
const int setMask;
int misses;
int hits;
public:
/**
* Construct a OptCPU object.
*/
OptCPU(const std::string &name,
MemTraceReader *_trace,
int block_size,
int cache_size,
int assoc);
/**
* Perform the optimal replacement simulation.
*/
void tick();
};
#endif
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