2208ea049f
This patch makes the bus bridge uni-directional and specialises the bus ports to be a master port and a slave port. This greatly simplifies the assumptions on both sides as either port only has to deal with requests or responses. The following patches introduce the notion of master and slave ports, and would not be possible without this split of responsibilities. In making the bridge unidirectional, the address range mechanism of the bridge is also changed. For the cases where communication is taking place both ways, an additional bridge is needed. This causes issues with the existing mechanism, as the busses cannot determine when to stop iterating the address updates from the two bridges. To avoid this issue, and also greatly simplify the specification, the bridge now has a fixed set of address ranges, specified at creation time.
96 lines
3 KiB
Python
96 lines
3 KiB
Python
# Copyright (c) 2006-2007 The Regents of The University of Michigan
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met: redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer;
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# redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution;
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# neither the name of the copyright holders nor the names of its
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# contributors may be used to endorse or promote products derived from
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# this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# Authors: Steve Reinhardt
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import m5
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from m5.objects import *
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m5.util.addToPath('../configs/common')
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import FSConfig
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# --------------------
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# Base L1 Cache
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# ====================
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class L1(BaseCache):
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latency = '1ns'
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block_size = 64
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mshrs = 4
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tgts_per_mshr = 8
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is_top_level = True
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# ----------------------
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# Base L2 Cache
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# ----------------------
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class L2(BaseCache):
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block_size = 64
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latency = '10ns'
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mshrs = 92
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tgts_per_mshr = 16
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write_buffers = 8
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# ---------------------
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# I/O Cache
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# ---------------------
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class IOCache(BaseCache):
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assoc = 8
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block_size = 64
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latency = '50ns'
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mshrs = 20
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size = '1kB'
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tgts_per_mshr = 12
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addr_range=AddrRange(0, size='256MB')
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forward_snoops = False
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#cpu
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cpu = AtomicSimpleCPU(cpu_id=0)
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#the system
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system = FSConfig.makeArmSystem('atomic', "RealView_PBX", None, False)
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system.iocache = IOCache()
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system.iocache.cpu_side = system.iobus.port
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system.iocache.mem_side = system.membus.port
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system.cpu = cpu
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#create the l1/l2 bus
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system.toL2Bus = Bus()
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#connect up the l2 cache
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system.l2c = L2(size='4MB', assoc=8)
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system.l2c.cpu_side = system.toL2Bus.port
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system.l2c.mem_side = system.membus.port
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#connect up the cpu and l1s
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cpu.addPrivateSplitL1Caches(L1(size = '32kB', assoc = 1),
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L1(size = '32kB', assoc = 4))
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# connect cpu level-1 caches to shared level-2 cache
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cpu.connectAllPorts(system.toL2Bus, system.membus)
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cpu.clock = '2GHz'
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root = Root(system=system)
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m5.ticks.setGlobalFrequency('1THz')
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