ex5_LITTLE.py revision 14216:188a91ee11c1 
1# Copyright (c) 2012 The Regents of The University of Michigan
2# Copyright (c) 2016 Centre National de la Recherche Scientifique
3# All rights reserved.
4#
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13# contributors may be used to endorse or promote products derived from
14# this software without specific prior written permission.
15#
16# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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22# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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25# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27#
28# Authors: Ron Dreslinski
29#          Anastasiia Butko
30#          Louisa Bessad
31
32from __future__ import print_function
33from __future__ import absolute_import
34
35from m5.objects import *
36
37#-----------------------------------------------------------------------
38#                ex5 LITTLE core (based on the ARM Cortex-A7)
39#-----------------------------------------------------------------------
40
41# Simple ALU Instructions have a latency of 3
42class ex5_LITTLE_Simple_Int(MinorDefaultIntFU):
43    opList = [ OpDesc(opClass='IntAlu', opLat=4) ]
44
45# Complex ALU instructions have a variable latencies
46class ex5_LITTLE_Complex_IntMul(MinorDefaultIntMulFU):
47    opList = [ OpDesc(opClass='IntMult', opLat=7) ]
48
49class ex5_LITTLE_Complex_IntDiv(MinorDefaultIntDivFU):
50    opList = [ OpDesc(opClass='IntDiv', opLat=9) ]
51
52# Floating point and SIMD instructions
53class ex5_LITTLE_FP(MinorDefaultFloatSimdFU):
54    opList = [ OpDesc(opClass='SimdAdd', opLat=6),
55               OpDesc(opClass='SimdAddAcc', opLat=4),
56               OpDesc(opClass='SimdAlu', opLat=4),
57               OpDesc(opClass='SimdCmp', opLat=1),
58               OpDesc(opClass='SimdCvt', opLat=3),
59               OpDesc(opClass='SimdMisc', opLat=3),
60               OpDesc(opClass='SimdMult',opLat=4),
61               OpDesc(opClass='SimdMultAcc',opLat=5),
62               OpDesc(opClass='SimdShift',opLat=3),
63               OpDesc(opClass='SimdShiftAcc', opLat=3),
64               OpDesc(opClass='SimdSqrt', opLat=9),
65               OpDesc(opClass='SimdFloatAdd',opLat=8),
66               OpDesc(opClass='SimdFloatAlu',opLat=6),
67               OpDesc(opClass='SimdFloatCmp', opLat=6),
68               OpDesc(opClass='SimdFloatCvt', opLat=6),
69               OpDesc(opClass='SimdFloatDiv', opLat=20, pipelined=False),
70               OpDesc(opClass='SimdFloatMisc', opLat=6),
71               OpDesc(opClass='SimdFloatMult', opLat=15),
72               OpDesc(opClass='SimdFloatMultAcc',opLat=6),
73               OpDesc(opClass='SimdFloatSqrt', opLat=17),
74               OpDesc(opClass='FloatAdd', opLat=8),
75               OpDesc(opClass='FloatCmp', opLat=6),
76               OpDesc(opClass='FloatCvt', opLat=6),
77               OpDesc(opClass='FloatDiv', opLat=15, pipelined=False),
78               OpDesc(opClass='FloatSqrt', opLat=33),
79               OpDesc(opClass='FloatMult', opLat=6) ]
80
81# Load/Store Units
82class ex5_LITTLE_MemFU(MinorDefaultMemFU):
83    opList = [ OpDesc(opClass='MemRead',opLat=1),
84               OpDesc(opClass='MemWrite',opLat=1) ]
85
86# Misc Unit
87class ex5_LITTLE_MiscFU(MinorDefaultMiscFU):
88    opList = [ OpDesc(opClass='IprAccess',opLat=1),
89               OpDesc(opClass='InstPrefetch',opLat=1) ]
90
91# Functional Units for this CPU
92class ex5_LITTLE_FUP(MinorFUPool):
93    funcUnits = [ex5_LITTLE_Simple_Int(), ex5_LITTLE_Simple_Int(),
94        ex5_LITTLE_Complex_IntMul(), ex5_LITTLE_Complex_IntDiv(),
95        ex5_LITTLE_FP(), ex5_LITTLE_MemFU(),
96        ex5_LITTLE_MiscFU()]
97
98class ex5_LITTLE(MinorCPU):
99    executeFuncUnits = ex5_LITTLE_FUP()
100
101class L1Cache(Cache):
102    tag_latency = 2
103    data_latency = 2
104    response_latency = 2
105    tgts_per_mshr = 8
106    # Consider the L2 a victim cache also for clean lines
107    writeback_clean = True
108
109class L1I(L1Cache):
110    mshrs = 2
111    size = '32kB'
112    assoc = 2
113    is_read_only = True
114    tgts_per_mshr = 20
115
116class L1D(L1Cache):
117    mshrs = 4
118    size = '32kB'
119    assoc = 4
120    write_buffers = 4
121
122# TLB Cache
123# Use a cache as a L2 TLB
124class WalkCache(Cache):
125    tag_latency = 2
126    data_latency = 2
127    response_latency = 2
128    mshrs = 6
129    tgts_per_mshr = 8
130    size = '1kB'
131    assoc = 2
132    write_buffers = 16
133    is_read_only = True
134    # Writeback clean lines as well
135    writeback_clean = True
136
137# L2 Cache
138class L2(Cache):
139    tag_latency = 9
140    data_latency = 9
141    response_latency = 9
142    mshrs = 8
143    tgts_per_mshr = 12
144    size = '512kB'
145    assoc = 8
146    write_buffers = 16
147    prefetch_on_access = True
148    clusivity = 'mostly_excl'
149    # Simple stride prefetcher
150    prefetcher = StridePrefetcher(degree=1, latency = 1)
151    tags = BaseSetAssoc()
152    replacement_policy = RandomRP()
153