/**
* Function: memoryStage
* This driver function updates the values in writebackStage
*/
void memoryStage(forwardType * forward, statusType * status, bubbleType * bubble) {
unsigned int valM;
unsigned int valE;
bool memError = FALSE;
valE = memAddr();
valM = memCond(valE,&memError);
if(!memRead())
valM = 0;
//Forwarding from memoryStage
(*forward).m_valM = valM;
(*forward).M_valE = M.valE;
(*forward).M_dstE = M.dstE;
(*forward).M_dstM = M.dstM;
(*forward).M_Cnd = M.Cnd;
(*forward).M_icode = M.icode;
(*forward).M_valA = M.valA;
unsigned int mStat;
mStat = setStat(memError);
//Updating stat in the statusType struct
//and the bubbleType struct
(*status).m_stat = mStat;
(*bubble).M_icode = M.icode;
if(!(W_stall(*bubble,*status)))
updateWStage(mStat,M.icode,M.valE,valM,M.dstE,M.dstM);
}
/* memoryStage
* Controls the main combinational logic of the memory stage
* Params: fwdStruct *fwd - contains a bunch of forwarding info
* Returns: void
* Modifies: Writeback Register
*/
void memoryStage(fwdStruct *fwd) {
if (M.stat == SINS || M.stat == SADR || M.stat == SHLT)
canUpdateMem = FALSE;
int valM = M.valA, stat = M.stat;
bool readC = FALSE, writeC = FALSE, memError = FALSE;
memoryControl(&readC, &writeC);
int memAddr = memoryAddr();
if (readC)
valM = getWord(memAddr, &memError);
if (writeC && canUpdateMem)
putWord(memAddr, M.valA, &memError);
if (memError) {
stat = SADR;
canUpdateMem = FALSE;
}
fwd->M_valE = M.valE;
fwd->m_valM = valM;
fwd->M_dstE = M.dstE;
fwd->M_dstM = M.dstM;
fwd->M_Cnd = M.Cnd;
fwd->M_icode = M.icode;
fwd->M_valA = M.valA;
fwd->m_stat = stat;
if (!W_stall(fwd))
updateWregister(stat, M.icode, M.valE, valM, M.dstE, M.dstM);
}
