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authorNathan Binkert <binkertn@umich.edu>2007-03-06 11:13:43 -0800
committerNathan Binkert <binkertn@umich.edu>2007-03-06 11:13:43 -0800
commitd55b25cde6d2c072885a2c468d209fb18d6628e6 (patch)
tree391c4e66a69818a95037a5f2adccb2e8e0c84648 /src/python/m5/ticks.py
parentf800fddcea850822efee031b9b904280639da4c6 (diff)
downloadgem5-d55b25cde6d2c072885a2c468d209fb18d6628e6.tar.xz
Move all of the parameters of the Root SimObject so they are
directly configured by python. Move stuff from root.(cc|hh) to core.(cc|hh) since it really belogs there now. In the process, simplify how ticks are used in the python code. --HG-- extra : convert_revision : cf82ee1ea20f9343924f30bacc2a38d4edee8df3
Diffstat (limited to 'src/python/m5/ticks.py')
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diff --git a/src/python/m5/ticks.py b/src/python/m5/ticks.py
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+# Copyright (c) 2007 The Regents of The University of Michigan
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met: redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer;
+# redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution;
+# neither the name of the copyright holders nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+# Authors: Nathan Binkert
+
+import sys
+
+import convert
+import internal
+
+tps = 1.0e12 # default to 1 THz (1 Tick == 1 ps)
+tps_fixed = False # once set to true, can't be changed
+
+# fix the global frequency and tell C++ about it
+def fixGlobalFrequency():
+ global tps, tps_fixed
+ if not tps_fixed:
+ tps_fixed = True
+ internal.core.setClockFrequency(int(tps))
+ print "Global frequency set at %d ticks per second" % int(tps)
+
+def setGlobalFrequency(ticksPerSecond):
+ global tps, tps_fixed
+
+ if tps_fixed:
+ raise AttributeError, \
+ "Global frequency already fixed at %f ticks/s." % tps
+
+ if isinstance(ticksPerSecond, (int, long)):
+ tps = ticksPerSecond
+ elif isinstance(ticksPerSecond, float):
+ tps = ticksPerSecond
+ elif isinstance(ticksPerSecond, str):
+ tps = round(convert.anyToFrequency(ticksPerSecond))
+ else:
+ raise TypeError, \
+ "wrong type '%s' for ticksPerSecond" % type(ticksPerSecond)
+
+# how big does a rounding error need to be before we warn about it?
+frequency_tolerance = 0.001 # 0.1%
+
+def fromSeconds(value):
+ if not isinstance(value, float):
+ raise TypeError, "can't convert '%s' to type tick" % type(value)
+
+ # once someone needs to convert to seconds, the global frequency
+ # had better be fixed
+ if not tps_fixed:
+ raise AttributeError, \
+ "In order to do conversions, the global frequency must be fixed"
+
+ if value == 0:
+ return 0
+
+ # convert the value from time to ticks
+ value *= tps
+
+ int_value = int(round(value))
+ err = (value - int_value) / value
+ if err > frequency_tolerance:
+ print >>sys.stderr, "Warning: rounding error > tolerance"
+ print >>sys.stderr, " %f rounded to %d" % (value, int_value)
+ return int_value
+
+__all__ = [ 'setGlobalFrequency', 'fixGlobalFrequency', 'fromSeconds',
+ 'frequency_tolerance' ]