90 lines
3.4 KiB
Python
90 lines
3.4 KiB
Python
|
# 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' ]
|