1 files changed, 22 insertions, 1 deletions
diff --git a/src/sim/stage.cc b/src/sim/stage.cc
index d8c882a..929a4b9 100644
--- a/src/sim/stage.cc
+++ b/src/sim/stage.cc
@@ -7,7 +7,7 @@ Stage::Stage(Stage *next)
 {
 	this->next = next;
 	this->curr_instr = nullptr;
-	this->status = OK;
+	this->status = STALLED;
 	this->checked_out = {};
 }
 
@@ -21,6 +21,27 @@ Storage *Stage::storage;
 bool Stage::is_pipelined;
 int Stage::clock_cycle;
 
+InstrDTO *Stage::advance(Response p)
+{
+	InstrDTO *r = nullptr;
+	Response n;
+
+	this->advance_helper();
+	if (this->status == OK && p == OK) {
+		// mutual consent
+		this->curr_instr->set_time_of(this->id, this->clock_cycle);
+		r = new InstrDTO(*this->curr_instr);
+		delete curr_instr;
+		curr_instr = nullptr;
+		this->status = STALLED;
+	}
+
+	n = (p != OK || this->status != OK) ? STALLED : OK;
+	// the power of consent
+	this->curr_instr = this->next->advance(n);
+	return r;
+}
+
 void Stage::set_condition(CC c, bool v)
 {
 	if (v)