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
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.
27 # Authors: Nathan Binkert
34 tps
= 1.0e12
# default to 1 THz (1 Tick == 1 ps)
35 tps_fixed
= False # once set to true, can't be changed
37 # fix the global frequency and tell C++ about it
38 def fixGlobalFrequency():
42 internal
.core
.setClockFrequency(int(tps
))
43 print "Global frequency set at %d ticks per second" % int(tps
)
45 def setGlobalFrequency(ticksPerSecond
):
49 raise AttributeError, \
50 "Global frequency already fixed at %f ticks/s." % tps
52 if isinstance(ticksPerSecond
, (int, long)):
54 elif isinstance(ticksPerSecond
, float):
56 elif isinstance(ticksPerSecond
, str):
57 tps
= round(convert
.anyToFrequency(ticksPerSecond
))
60 "wrong type '%s' for ticksPerSecond" % type(ticksPerSecond
)
62 # how big does a rounding error need to be before we warn about it?
63 frequency_tolerance
= 0.001 # 0.1%
65 def fromSeconds(value
):
66 if not isinstance(value
, float):
67 raise TypeError, "can't convert '%s' to type tick" % type(value
)
69 # once someone needs to convert to seconds, the global frequency
72 raise AttributeError, \
73 "In order to do conversions, the global frequency must be fixed"
78 # convert the value from time to ticks
81 int_value
= int(round(value
))
82 err
= (value
- int_value
) / value
83 if err
> frequency_tolerance
:
84 print >>sys
.stderr
, "Warning: rounding error > tolerance"
85 print >>sys
.stderr
, " %f rounded to %d" % (value
, int_value
)
88 __all__
= [ 'setGlobalFrequency', 'fixGlobalFrequency', 'fromSeconds',
89 'frequency_tolerance' ]