1 # Copyright (c) 2005-2007 The Regents of The University of Michigan
2 # Copyright (c) 2010-2013 Advanced Micro Devices, Inc.
3 # Copyright (c) 2013 Mark D. Hill and David A. Wood
6 # Redistribution and use in source and binary forms, with or without
7 # modification, are permitted provided that the following conditions are
8 # met: redistributions of source code must retain the above copyright
9 # notice, this list of conditions and the following disclaimer;
10 # redistributions in binary form must reproduce the above copyright
11 # notice, this list of conditions and the following disclaimer in the
12 # documentation and/or other materials provided with the distribution;
13 # neither the name of the copyright holders nor the names of its
14 # contributors may be used to endorse or promote products derived from
15 # this software without specific prior written permission.
17 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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27 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 # Authors: Nathan Binkert
31 from m5
.SimObject
import SimObject
32 from m5
.defines
import buildEnv
33 from m5
.params
import *
34 from m5
.util
import fatal
36 class Root(SimObject
):
40 def __new__(cls
, **kwargs
):
41 if Root
._the
_instance
:
42 fatal("Attempt to allocate multiple instances of Root.")
45 # first call: allocate the unique instance
47 # If SimObject ever implements __new__, we may want to pass
48 # kwargs here, but for now this goes straight to
49 # object.__new__ which prints an ugly warning if you pass it
50 # args. Seems like a bad design but that's the way it is.
51 Root
._the
_instance
= SimObject
.__new
__(cls
)
52 return Root
._the
_instance
56 return Root
._the
_instance
62 cxx_header
= "sim/root.hh"
64 # By default, root sim object and hence all other sim objects schedule
65 # event on the eventq with index 0.
68 # Simulation Quantum for multiple main event queue simulation.
69 # Needs to be set explicitly for a multi-eventq simulation.
70 sim_quantum
= Param
.Tick(0, "simulation quantum")
72 full_system
= Param
.Bool("if this is a full system simulation")
74 # Time syncing prevents the simulation from running faster than real time.
75 time_sync_enable
= Param
.Bool(False, "whether time syncing is enabled")
76 time_sync_period
= Param
.Clock("100ms", "how often to sync with real time")
77 time_sync_spin_threshold
= \
78 Param
.Clock("100us", "when less than this much time is left, spin")