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/*
* Copyright (c) 2007 MIPS Technologies, Inc.
* 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: Korey Sewell
*
*/
#ifndef __CPU_INORDER_PIPELINE_IMPL_HH__
#define __CPU_INORDER_PIPELINE_IMPL_HH__
#include <list>
#include <queue>
#include <vector>
#include "arch/isa_traits.hh"
#include "cpu/base.hh"
#include "params/InOrderCPU.hh"
class InOrderDynInst;
/* This Namespace contains constants, typedefs, functions and
* objects specific to the Pipeline Implementation.
*/
namespace ThePipeline {
// Pipeline Constants
const unsigned NumStages = 5;
const ThreadID MaxThreads = 8;
const unsigned StageWidth = 1;
const unsigned BackEndStartStage = 2;
// List of Resources The Pipeline Uses
enum ResourceId {
FetchSeq = 0,
ICache,
Decode,
BPred,
FetchBuff,
RegManager,
AGEN,
ExecUnit,
MDU,
DCache,
Grad,
FetchBuff2
};
// Expand this as necessary for your inter stage buffer sizes
static const unsigned interStageBuffSize[] = {
StageWidth, /* Stage 0 - 1 */
StageWidth, /* Stage 1 - 2 */
StageWidth, /* Stage 2 - 3 */
StageWidth, /* Stage 3 - 4 */
StageWidth, /* Stage 4 - 5 */
StageWidth, /* Stage 5 - 6 */
StageWidth, /* Stage 6 - 7 */
StageWidth, /* Stage 7 - 8 */
StageWidth /* Stage 8 - 9 */
};
typedef InOrderCPUParams Params;
typedef RefCountingPtr<InOrderDynInst> DynInstPtr;
//////////////////////////
// RESOURCE SCHEDULING
//////////////////////////
struct ScheduleEntry {
ScheduleEntry(int stage_num, int _priority, int res_num, int _cmd = 0,
int _idx = 0) :
stageNum(stage_num), resNum(res_num), cmd(_cmd),
idx(_idx), priority(_priority)
{ }
virtual ~ScheduleEntry(){}
// Stage number to perform this service.
int stageNum;
// Resource ID to access
int resNum;
// See specific resource for meaning
unsigned cmd;
// See specific resource for meaning
unsigned idx;
// Some Resources May Need Priority?
int priority;
};
struct entryCompare {
bool operator()(const ScheduleEntry* lhs, const ScheduleEntry* rhs)
const
{
// Prioritize first by stage number that the resource is needed
if (lhs->stageNum > rhs->stageNum) {
return true;
} else if (lhs->stageNum == rhs->stageNum) {
if (lhs->priority > rhs->priority) {
return true;
} else {
return false;
}
} else {
return false;
}
}
};
typedef std::priority_queue<ScheduleEntry*, std::vector<ScheduleEntry*>,
entryCompare> ResSchedule;
void createFrontEndSchedule(DynInstPtr &inst);
bool createBackEndSchedule(DynInstPtr &inst);
int getNextPriority(DynInstPtr &inst, int stage_num);
class InstStage {
private:
int nextTaskPriority;
int stageNum;
ResSchedule *instSched;
public:
InstStage(DynInstPtr inst, int stage_num);
void needs(int unit, int request) {
instSched->push( new ScheduleEntry(
stageNum, nextTaskPriority++, unit, request
));
}
void needs(int unit, int request, int param) {
instSched->push( new ScheduleEntry(
stageNum, nextTaskPriority++, unit, request, param
));
}
};
};
#endif
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