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inorder: dont handle multiple faults on same cycle

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if a faulting instruction reaches an execution unit,
then ignore it and pass it through the pipeline.

Once we recognize the fault in the graduation unit,
dont allow a second fault to creep in on the same cycle.
This commit is contained in:
Korey Sewell
2011-06-19 21:43:40 -04:00
parent c4deabfb97
commit 561c33f082
16 changed files with 171 additions and 58 deletions
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16
src/cpu/inorder/cpu.cc
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@@ -196,7 +196,6 @@ InOrderCPU::InOrderCPU(Params *params)
timeBuffer(2 , 2),
removeInstsThisCycle(false),
activityRec(params->name, NumStages, 10, params->activity),
stCondFails(0),
#if FULL_SYSTEM
system(params->system),
#endif // FULL_SYSTEM
@@ -372,7 +371,8 @@ InOrderCPU::InOrderCPU(Params *params)
endOfSkedIt = skedCache.end();
frontEndSked = createFrontEndSked();
faultSked = createFaultSked();
lastRunningCycle = curTick();
lockAddr = 0;
@@ -417,11 +417,21 @@ InOrderCPU::createFrontEndSked()
D.needs(FetchSeq, FetchSeqUnit::UpdateTargetPC);
DPRINTF(SkedCache, "Resource Sked created for instruction \"front_end\"\n");
DPRINTF(SkedCache, "Resource Sked created for instruction Front End\n");
return res_sked;
}
RSkedPtr
InOrderCPU::createFaultSked()
{
RSkedPtr res_sked = new ResourceSked();
StageScheduler W(res_sked, NumStages - 1);
W.needs(Grad, GraduationUnit::CheckFault);
DPRINTF(SkedCache, "Resource Sked created for instruction Faults\n");
return res_sked;
}
RSkedPtr
InOrderCPU::createBackEndSked(DynInstPtr inst)
{