ce2722cdd9
If the cache access mode is parallel, i.e. "sequential_access" parameter is set to "False", tags and data are accessed in parallel. Therefore, the hit_latency is the maximum latency between tag_latency and data_latency. On the other hand, if the cache access mode is sequential, i.e. "sequential_access" parameter is set to "True", tags and data are accessed sequentially. Therefore, the hit_latency is the sum of tag_latency plus data_latency. Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
98 lines
3.5 KiB
Python
98 lines
3.5 KiB
Python
# Copyright (c) 2012 ARM Limited
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# All rights reserved.
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#
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# The license below extends only to copyright in the software and shall
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# not be construed as granting a license to any other intellectual
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# property including but not limited to intellectual property relating
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# to a hardware implementation of the functionality of the software
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# licensed hereunder. You may use the software subject to the license
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# terms below provided that you ensure that this notice is replicated
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# unmodified and in its entirety in all distributions of the software,
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# modified or unmodified, in source code or in binary form.
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#
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# 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: Lisa Hsu
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from m5.objects import *
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# Base implementations of L1, L2, IO and TLB-walker caches. There are
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# used in the regressions and also as base components in the
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# system-configuration scripts. The values are meant to serve as a
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# starting point, and specific parameters can be overridden in the
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# specific instantiations.
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class L1Cache(Cache):
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assoc = 2
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tag_latency = 2
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data_latency = 2
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response_latency = 2
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mshrs = 4
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tgts_per_mshr = 20
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class L1_ICache(L1Cache):
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is_read_only = True
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# Writeback clean lines as well
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writeback_clean = True
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class L1_DCache(L1Cache):
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pass
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class L2Cache(Cache):
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assoc = 8
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tag_latency = 20
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data_latency = 20
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response_latency = 20
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mshrs = 20
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tgts_per_mshr = 12
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write_buffers = 8
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class IOCache(Cache):
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assoc = 8
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tag_latency = 50
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data_latency = 50
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response_latency = 50
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mshrs = 20
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size = '1kB'
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tgts_per_mshr = 12
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class PageTableWalkerCache(Cache):
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assoc = 2
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tag_latency = 2
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data_latency = 2
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response_latency = 2
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mshrs = 10
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size = '1kB'
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tgts_per_mshr = 12
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# the x86 table walker actually writes to the table-walker cache
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if buildEnv['TARGET_ISA'] == 'x86':
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is_read_only = False
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else:
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is_read_only = True
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# Writeback clean lines as well
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writeback_clean = True
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