ticks.py revision 13719:74853963ddcf
1# Copyright (c) 2007 The Regents of The University of Michigan 2# All rights reserved. 3# 4# Redistribution and use in source and binary forms, with or without 5# modification, are permitted provided that the following conditions are 6# met: redistributions of source code must retain the above copyright 7# notice, this list of conditions and the following disclaimer; 8# redistributions in binary form must reproduce the above copyright 9# notice, this list of conditions and the following disclaimer in the 10# documentation and/or other materials provided with the distribution; 11# neither the name of the copyright holders nor the names of its 12# contributors may be used to endorse or promote products derived from 13# this software without specific prior written permission. 14# 15# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 18# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 19# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 21# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 25# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26# 27# Authors: Nathan Binkert 28 29from __future__ import print_function 30import six 31if six.PY3: 32 long = int 33 34import sys 35from m5.util import warn 36 37# fix the global frequency 38def fixGlobalFrequency(): 39 import _m5.core 40 _m5.core.fixClockFrequency() 41 42def setGlobalFrequency(ticksPerSecond): 43 from m5.util import convert 44 import _m5.core 45 46 if isinstance(ticksPerSecond, (int, long)): 47 tps = ticksPerSecond 48 elif isinstance(ticksPerSecond, float): 49 tps = ticksPerSecond 50 elif isinstance(ticksPerSecond, str): 51 tps = round(convert.anyToFrequency(ticksPerSecond)) 52 else: 53 raise TypeError( 54 "wrong type '%s' for ticksPerSecond" % type(ticksPerSecond)) 55 _m5.core.setClockFrequency(int(tps)) 56 57# how big does a rounding error need to be before we warn about it? 58frequency_tolerance = 0.001 # 0.1% 59 60def fromSeconds(value): 61 import _m5.core 62 63 if not isinstance(value, float): 64 raise TypeError("can't convert '%s' to type tick" % type(value)) 65 66 # once someone needs to convert to seconds, the global frequency 67 # had better be fixed 68 if not _m5.core.clockFrequencyFixed(): 69 raise AttributeError( 70 "In order to do conversions, the global frequency must be fixed") 71 72 if value == 0: 73 return 0 74 75 # convert the value from time to ticks 76 value *= _m5.core.getClockFrequency() 77 78 int_value = int(round(value)) 79 err = (value - int_value) / value 80 if err > frequency_tolerance: 81 warn("rounding error > tolerance\n %f rounded to %d", value, 82 int_value) 83 return int_value 84 85__all__ = [ 'setGlobalFrequency', 'fixGlobalFrequency', 'fromSeconds', 86 'frequency_tolerance' ] 87