Root.py revision 9338
1# Copyright (c) 2005-2007 The Regents of The University of Michigan 2# Copyright (c) 2010 Advanced Micro Devices, Inc. 3# All rights reserved. 4# 5# Redistribution and use in source and binary forms, with or without 6# modification, are permitted provided that the following conditions are 7# met: redistributions of source code must retain the above copyright 8# notice, this list of conditions and the following disclaimer; 9# redistributions in binary form must reproduce the above copyright 10# notice, this list of conditions and the following disclaimer in the 11# documentation and/or other materials provided with the distribution; 12# neither the name of the copyright holders nor the names of its 13# contributors may be used to endorse or promote products derived from 14# this software without specific prior written permission. 15# 16# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27# 28# Authors: Nathan Binkert 29 30from m5.SimObject import SimObject 31from m5.defines import buildEnv 32from m5.params import * 33from m5.util import fatal 34 35class Root(SimObject): 36 37 _the_instance = None 38 39 def __new__(cls, **kwargs): 40 if Root._the_instance: 41 fatal("Attempt to allocate multiple instances of Root.") 42 return None 43 44 # first call: allocate the unique instance 45 # 46 # If SimObject ever implements __new__, we may want to pass 47 # kwargs here, but for now this goes straight to 48 # object.__new__ which prints an ugly warning if you pass it 49 # args. Seems like a bad design but that's the way it is. 50 Root._the_instance = SimObject.__new__(cls) 51 return Root._the_instance 52 53 @classmethod 54 def getInstance(cls): 55 return Root._the_instance 56 57 def path(self): 58 return 'root' 59 60 type = 'Root' 61 cxx_header = "sim/root.hh" 62 63 full_system = Param.Bool("if this is a full system simulation") 64 65 # Time syncing prevents the simulation from running faster than real time. 66 time_sync_enable = Param.Bool(False, "whether time syncing is enabled") 67 time_sync_period = Param.Clock("100ms", "how often to sync with real time") 68 time_sync_spin_threshold = \ 69 Param.Clock("100us", "when less than this much time is left, spin") 70