Implement a very very simple bus

requestTime -> time
responseTime -> packet.time

Make CPU and memory able to connect to the bus

dev/io_device.cc:
    update for request and packet both having a time
    hand platform off to port for eventual selection of request modes
dev/io_device.hh:
    update for request and packet both havig a time
    hand platform off to port for eventual selection of request modes
mem/bus.hh:
    Add a device map struct that maps a range to a portId
    - Which needs work it theory it should be an interval tree
    - but it is a list and works fine right now

    Add a function called findPort which returns port for an addr range

    Add a deviceBlockSize function that really shouldn't exist, but it
    was easier than fixing the translating port
mem/packet.hh:
    add a time to each packet
mem/physical.cc:
mem/physical.hh:
python/m5/objects/PhysicalMemory.py:
    Make physical memory take a MemObject parameter of what to connect to
mem/request.hh:
    remove requestTime/responseTime for just time in request which
    is requset time and the time in the packet which is responsetime
python/m5/objects/BaseCPU.py:
    Instead of memory cpu connects to any memory object
python/m5/objects/Bus.py:
    Fix for new bus object

--HG--
extra : convert_revision : 72605e8a3fcdd9e80a41f439909ee7feb3f1fe1d

python/m5/objects/BaseCPU.py

@@ -9,7 +9,7 @@ class BaseCPU(SimObject):
         system = Param.System(Parent.any, "system object")
         cpu_id = Param.Int(-1, "CPU identifier")
     else:
-        mem = Param.Memory(Parent.any, "memory")
+        mem = Param.MemObject("memory")
         workload = VectorParam.Process("processes to run")
 
     max_insts_all_threads = Param.Counter(0,

python/m5/objects/Bus.py

@@ -1,7 +1,6 @@
 from m5 import *
-from BaseHier import BaseHier
+from MemObject import MemObject
 
-class Bus(BaseHier):
+class Bus(MemObject):
     type = 'Bus'
-    clock = Param.Clock("bus frequency")
-    width = Param.Int("bus width in bytes")
+    bus_id = Param.Int(0, "blah")

python/m5/objects/PhysicalMemory.py

@@ -5,5 +5,6 @@ class PhysicalMemory(Memory):
     type = 'PhysicalMemory'
     range = Param.AddrRange("Device Address")
     file = Param.String('', "memory mapped file")
+    bus = Param.MemObject("Bus to attach to")
     if build_env['FULL_SYSTEM']:
         mmu = Param.MemoryController(Parent.any, "Memory Controller")