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inorder: recognize isSerializeAfter flag

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keep track of when an instruction needs the execution
behind it to be serialized. Without this, in SE Mode
instructions can execute behind a system call exit().
This commit is contained in:
Korey Sewell 2011-02-18 14:29:48 -05:00
parent bbffd9419d
commit 89335118a5
2 changed files with 26 additions and 9 deletions
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34
src/cpu/inorder/resources/execution_unit.cc
View file

@ -42,7 +42,7 @@ ExecutionUnit::ExecutionUnit(string res_name, int res_id, int res_width,
int res_latency, InOrderCPU *_cpu,
ThePipeline::Params *params)
: Resource(res_name, res_id, res_width, res_latency, _cpu),
lastExecuteTick(0), lastControlTick(0)
lastExecuteTick(0), lastControlTick(0), serializeTick(0)
{ }
void
@ -86,23 +86,39 @@ ExecutionUnit::execute(int slot_num)
DynInstPtr inst = reqs[slot_num]->inst;
Fault fault = NoFault;
int seq_num = inst->seqNum;
Tick cur_tick = curTick();
if (cur_tick == serializeTick) {
DPRINTF(InOrderExecute, "Can not execute [tid:%i][sn:%i][PC:%s] %s. "
"All instructions are being serialized this cycle\n",
inst->readTid(), seq_num, inst->pcState(), inst->instName());
exec_req->done(false);
return;
}
DPRINTF(InOrderExecute, "[tid:%i] Executing [sn:%i] [PC:%s] %s.\n",
inst->readTid(), seq_num, inst->pcState(), inst->instName());
switch (exec_req->cmd)
{
case ExecuteInst:
{
if (curTick() != lastExecuteTick) {
lastExecuteTick = curTick();
DPRINTF(InOrderExecute, "[tid:%i] Executing [sn:%i] [PC:%s] %s.\n",
inst->readTid(), seq_num, inst->pcState(), inst->instName());
if (cur_tick != lastExecuteTick) {
lastExecuteTick = cur_tick;
}
assert(!inst->isMemRef());
if (inst->isMemRef()) {
panic("%s not configured to handle memory ops.\n", resName);
} else if (inst->isControl()) {
if (lastControlTick == curTick()) {
if (inst->isSerializeAfter()) {
serializeTick = cur_tick;
DPRINTF(InOrderExecute, "Serializing execution after [tid:%i] "
"[sn:%i] [PC:%s] %s.\n", inst->readTid(), seq_num,
inst->pcState(), inst->instName());
}
if (inst->isControl()) {
if (lastControlTick == cur_tick) {
DPRINTF(InOrderExecute, "Can not Execute More than One Control "
"Inst Per Cycle. Blocking Request.\n");
exec_req->done(false);

1
src/cpu/inorder/resources/execution_unit.hh
View file

@ -76,6 +76,7 @@ class ExecutionUnit : public Resource {
Stats::Scalar executions;
Tick lastExecuteTick;
Tick lastControlTick;
Tick serializeTick;
};