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-rw-r--r--src/cpu/base.cc27
1 files changed, 27 insertions, 0 deletions
diff --git a/src/cpu/base.cc b/src/cpu/base.cc
index 624843f42..0f9fe49ea 100644
--- a/src/cpu/base.cc
+++ b/src/cpu/base.cc
@@ -64,6 +64,7 @@
#include "debug/SyscallVerbose.hh"
#include "mem/page_table.hh"
#include "params/BaseCPU.hh"
+#include "sim/clocked_object.hh"
#include "sim/full_system.hh"
#include "sim/process.hh"
#include "sim/sim_events.hh"
@@ -355,6 +356,11 @@ BaseCPU::startup()
if (params()->progress_interval) {
new CPUProgressEvent(this, params()->progress_interval);
}
+
+ // Assumption CPU start to operate instantaneously without any latency
+ if (ClockedObject::pwrState() == Enums::PwrState::UNDEFINED)
+ ClockedObject::pwrState(Enums::PwrState::ON);
+
}
ProbePoints::PMUUPtr
@@ -473,6 +479,27 @@ BaseCPU::findContext(ThreadContext *tc)
}
void
+BaseCPU::activateContext(ThreadID thread_num)
+{
+ // For any active thread running, update CPU power state to active (ON)
+ ClockedObject::pwrState(Enums::PwrState::ON);
+}
+
+void
+BaseCPU::suspendContext(ThreadID thread_num)
+{
+ // Check if all threads are suspended
+ for (auto t : threadContexts) {
+ if (t->status() != ThreadContext::Suspended) {
+ return;
+ }
+ }
+
+ // All CPU threads suspended, enter lower power state for the CPU
+ ClockedObject::pwrState(Enums::PwrState::CLK_GATED);
+}
+
+void
BaseCPU::switchOut()
{
assert(!_switchedOut);