1 # Copyright (c) 2007 The Regents of The University of Michigan
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.
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
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25 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 from __future__
import print_function
33 from m5
.util
import warn
35 # fix the global frequency
36 def fixGlobalFrequency():
38 _m5
.core
.fixClockFrequency()
40 def setGlobalFrequency(ticksPerSecond
):
41 from m5
.util
import convert
44 if isinstance(ticksPerSecond
, (int, long)):
46 elif isinstance(ticksPerSecond
, float):
48 elif isinstance(ticksPerSecond
, str):
49 tps
= round(convert
.anyToFrequency(ticksPerSecond
))
52 "wrong type '%s' for ticksPerSecond" % type(ticksPerSecond
))
53 _m5
.core
.setClockFrequency(int(tps
))
55 # how big does a rounding error need to be before we warn about it?
56 frequency_tolerance
= 0.001 # 0.1%
58 def fromSeconds(value
):
61 if not isinstance(value
, float):
62 raise TypeError("can't convert '%s' to type tick" % type(value
))
64 # once someone needs to convert to seconds, the global frequency
66 if not _m5
.core
.clockFrequencyFixed():
68 "In order to do conversions, the global frequency must be fixed")
73 # convert the value from time to ticks
74 value
*= _m5
.core
.getClockFrequency()
76 int_value
= int(round(value
))
77 err
= (value
- int_value
) / value
78 if err
> frequency_tolerance
:
79 warn("rounding error > tolerance\n %f rounded to %d", value
,
83 __all__
= [ 'setGlobalFrequency', 'fixGlobalFrequency', 'fromSeconds',
84 'frequency_tolerance' ]