python: Move native wrappers to the _m5 namespace

Swig wrappers for native objects currently share the _m5.internal name
space with Python code. This is undesirable if we ever want to switch
from Swig to some other framework for native binding (e.g., PyBind11
or Boost::Python). This changeset moves all of such wrappers to the
_m5 namespace, which is now reserved for native code.

Change-Id: I2d2bc12dbc05b57b7c5a75f072e08124413d77f3
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Curtis Dunham <curtis.dunham@arm.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>

tests/configs/switcheroo.py

@@ -36,6 +36,7 @@
 # Authors: Andreas Sandberg
 
 import m5
+import _m5
 from m5.objects import *
 m5.util.addToPath('../configs/')
 from common.Caches import *
@@ -104,7 +105,7 @@ def run_test(root, switcher=None, freq=1000, verbose=False):
     # Suppress "Entering event queue" messages since we get tons of them.
     # Worse yet, they include the timestamp, which makes them highly
     # variable and unsuitable for comparing as test outputs.
-    m5.internal.core.cvar.want_info = verbose
+    _m5.core.cvar.want_info = verbose
 
     # instantiate configuration
     m5.instantiate()