gem5/tests/configs/realview-simple-timing.py
Andreas Hansson 0d32940711 Bus: Split the bus into a non-coherent and coherent bus
This patch introduces a class hierarchy of buses, a non-coherent one,
and a coherent one, splitting the existing bus functionality. By doing
so it also enables further specialisation of the two types of buses.

A non-coherent bus connects a number of non-snooping masters and
slaves, and routes the request and response packets based on the
address. The request packets issued by the master connected to a
non-coherent bus could still snoop in caches attached to a coherent
bus, as is the case with the I/O bus and memory bus in most system
configurations. No snoops will, however, reach any master on the
non-coherent bus itself. The non-coherent bus can be used as a
template for modelling PCI, PCIe, and non-coherent AMBA and OCP buses,
and is typically used for the I/O buses.

A coherent bus connects a number of (potentially) snooping masters and
slaves, and routes the request and response packets based on the
address, and also forwards all requests to the snoopers and deals with
the snoop responses. The coherent bus can be used as a template for
modelling QPI, HyperTransport, ACE and coherent OCP buses, and is
typically used for the L1-to-L2 buses and as the main system
interconnect.

The configuration scripts are updated to use a NoncoherentBus for all
peripheral and I/O buses.

A bit of minor tidying up has also been done.

--HG--
rename : src/mem/bus.cc => src/mem/coherent_bus.cc
rename : src/mem/bus.hh => src/mem/coherent_bus.hh
rename : src/mem/bus.cc => src/mem/noncoherent_bus.cc
rename : src/mem/bus.hh => src/mem/noncoherent_bus.hh
2012-05-31 13:30:04 -04:00

99 lines
3.1 KiB
Python

# Copyright (c) 2006-2007 The Regents of The University of Michigan
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# Authors: Steve Reinhardt
import m5
from m5.objects import *
m5.util.addToPath('../configs/common')
import FSConfig
# --------------------
# Base L1 Cache
# ====================
class L1(BaseCache):
latency = '1ns'
block_size = 64
mshrs = 4
tgts_per_mshr = 8
is_top_level = True
# ----------------------
# Base L2 Cache
# ----------------------
class L2(BaseCache):
block_size = 64
latency = '10ns'
mshrs = 92
tgts_per_mshr = 16
write_buffers = 8
# ---------------------
# I/O Cache
# ---------------------
class IOCache(BaseCache):
assoc = 8
block_size = 64
latency = '50ns'
mshrs = 20
size = '1kB'
tgts_per_mshr = 12
addr_ranges = [AddrRange(0, size='256MB')]
forward_snoops = False
#cpu
cpu = TimingSimpleCPU(cpu_id=0)
#the system
system = FSConfig.makeArmSystem('timing', "RealView_PBX", None, False)
system.cpu = cpu
#create the l1/l2 bus
system.toL2Bus = CoherentBus()
system.iocache = IOCache()
system.iocache.cpu_side = system.iobus.master
system.iocache.mem_side = system.membus.slave
#connect up the l2 cache
system.l2c = L2(size='4MB', assoc=8)
system.l2c.cpu_side = system.toL2Bus.master
system.l2c.mem_side = system.membus.slave
#connect up the cpu and l1s
cpu.addPrivateSplitL1Caches(L1(size = '32kB', assoc = 1),
L1(size = '32kB', assoc = 4))
# create the interrupt controller
cpu.createInterruptController()
# connect cpu level-1 caches to shared level-2 cache
cpu.connectAllPorts(system.toL2Bus, system.membus)
cpu.clock = '2GHz'
root = Root(full_system=True, system=system)
m5.ticks.setGlobalFrequency('1THz')