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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_TLB_UNIT_HH__
#define __CPU_INORDER_TLB_UNIT_HH__
#include <vector>
#include <list>
#include <string>
#include "cpu/inorder/resources/inst_buffer.hh"
#include "cpu/inorder/inorder_dyn_inst.hh"
#include "cpu/inorder/pipeline_traits.hh"
#include "cpu/inorder/cpu.hh"
class TLBUnit : public Resource
{
public:
typedef ThePipeline::DynInstPtr DynInstPtr;
enum TLBCommand {
FetchLookup,
DataReadLookup,
DataWriteLookup
};
public:
TLBUnit(std::string res_name, int res_id, int res_width,
int res_latency, InOrderCPU *_cpu, ThePipeline::Params *params);
virtual ~TLBUnit() {}
void init();
int getSlot(DynInstPtr inst);
virtual ResourceRequest* getRequest(DynInstPtr _inst, int stage_num,
int res_idx, int slot_num,
unsigned cmd);
virtual void execute(int slot_num);
void squash(DynInstPtr inst, int stage_num, InstSeqNum squash_seq_num,
ThreadID tid);
bool tlbBlocked[ThePipeline::MaxThreads];
TheISA::TLB* tlb();
protected:
/** List of instructions this resource is currently
* processing.
*/
std::list<DynInstPtr> instList;
TheISA::TLB *_tlb;
};
class TLBUnitEvent : public ResourceEvent {
public:
/** Constructs a resource event. */
TLBUnitEvent();
virtual ~TLBUnitEvent() {}
/** Processes a resource event. */
virtual void process();
};
class TLBUnitRequest : public ResourceRequest {
public:
typedef ThePipeline::DynInstPtr DynInstPtr;
public:
TLBUnitRequest(TLBUnit *res, DynInstPtr inst, int stage_num, int res_idx, int slot_num,
unsigned _cmd)
: ResourceRequest(res, inst, stage_num, res_idx, slot_num, _cmd)
{
Addr aligned_addr;
int req_size;
unsigned flags;
if (_cmd == TLBUnit::FetchLookup) {
aligned_addr = inst->getMemAddr();
req_size = sizeof(TheISA::MachInst);
flags = 0;
inst->fetchMemReq = new Request(inst->readTid(), aligned_addr, req_size,
flags, inst->readPC(), res->cpu->readCpuId(), inst->readTid());
memReq = inst->fetchMemReq;
} else {
aligned_addr = inst->getMemAddr();;
req_size = 0; //inst->getMemAccSize();
flags = 0; //inst->getMemFlags();
if (req_size == 0 && (inst->isDataPrefetch() || inst->isInstPrefetch())) {
req_size = 8;
}
inst->dataMemReq = new Request(inst->readTid(), aligned_addr, req_size,
flags, inst->readPC(), res->cpu->readCpuId(), inst->readTid());
memReq = inst->dataMemReq;
}
}
RequestPtr memReq;
};
#endif //__CPU_INORDER_TLB_UNIT_HH__
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