# Copyright (c) 2005-2007 The Regents of The University of Michigan
+# Copyright (c) 2010-2013 Advanced Micro Devices, Inc.
+# Copyright (c) 2013 Mark D. Hill and David A. Wood
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
from m5.SimObject import SimObject
from m5.params import *
+from m5.util import fatal
class Root(SimObject):
+
+ _the_instance = None
+
+ def __new__(cls, **kwargs):
+ if Root._the_instance:
+ fatal("Attempt to allocate multiple instances of Root.")
+ return None
+
+ # first call: allocate the unique instance
+ #
+ # If SimObject ever implements __new__, we may want to pass
+ # kwargs here, but for now this goes straight to
+ # object.__new__ which prints an ugly warning if you pass it
+ # args. Seems like a bad design but that's the way it is.
+ Root._the_instance = SimObject.__new__(cls)
+ return Root._the_instance
+
+ @classmethod
+ def getInstance(cls):
+ return Root._the_instance
+
+ def path(self):
+ return 'root'
+
type = 'Root'
- dummy = Param.Int(0, "We don't support objects without params")
+ cxx_header = "sim/root.hh"
+
+ # By default, root sim object and hence all other sim objects schedule
+ # event on the eventq with index 0.
+ eventq_index = 0
+
+ # Simulation Quantum for multiple main event queue simulation.
+ # Needs to be set explicitly for a multi-eventq simulation.
+ sim_quantum = Param.Tick(0, "simulation quantum")
+
+ full_system = Param.Bool("if this is a full system simulation")
+
+ # Time syncing prevents the simulation from running faster than real time.
+ time_sync_enable = Param.Bool(False, "whether time syncing is enabled")
+ time_sync_period = Param.Clock("100ms", "how often to sync with real time")
+ time_sync_spin_threshold = \
+ Param.Clock("100us", "when less than this much time is left, spin")