Adding gem5 source to svn.

git-svn-id: https://www4.informatik.uni-erlangen.de/i4svn/danceos/trunk/devel/fail@1819 8c4709b5-6ec9-48aa-a5cd-a96041d1645a

simulators/gem5/src/python/m5/ticks.py

@@ -0,0 +1,89 @@
+# 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
+
+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():
+    import internal
+    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):
+    from m5.util import convert
+
+    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' ]