ticks.py revision 13409:071d5425ce37
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 30 31import sys 32from m5.util import warn 33 34# fix the global frequency 35def fixGlobalFrequency(): 36 import _m5.core 37 _m5.core.fixClockFrequency() 38 39def setGlobalFrequency(ticksPerSecond): 40 from m5.util import convert 41 import _m5.core 42 43 if isinstance(ticksPerSecond, (int, long)): 44 tps = ticksPerSecond 45 elif isinstance(ticksPerSecond, float): 46 tps = ticksPerSecond 47 elif isinstance(ticksPerSecond, str): 48 tps = round(convert.anyToFrequency(ticksPerSecond)) 49 else: 50 raise TypeError, \ 51 "wrong type '%s' for ticksPerSecond" % type(ticksPerSecond) 52 _m5.core.setClockFrequency(tps) 53 54# how big does a rounding error need to be before we warn about it? 55frequency_tolerance = 0.001 # 0.1% 56 57def fromSeconds(value): 58 import _m5.core 59 60 if not isinstance(value, float): 61 raise TypeError, "can't convert '%s' to type tick" % type(value) 62 63 # once someone needs to convert to seconds, the global frequency 64 # had better be fixed 65 if not _m5.core.clockFrequencyFixed(): 66 raise AttributeError, \ 67 "In order to do conversions, the global frequency must be fixed" 68 69 if value == 0: 70 return 0 71 72 # convert the value from time to ticks 73 value *= _m5.core.getClockFrequency() 74 75 int_value = int(round(value)) 76 err = (value - int_value) / value 77 if err > frequency_tolerance: 78 warn("rounding error > tolerance\n %f rounded to %d", value, 79 int_value) 80 return int_value 81 82__all__ = [ 'setGlobalFrequency', 'fixGlobalFrequency', 'fromSeconds', 83 'frequency_tolerance' ] 84