1# Copyright (c) 2016 ARM Limited
2# All rights reserved.
3#
4# The license below extends only to copyright in the software and shall
5# not be construed as granting a license to any other intellectual
6# property including but not limited to intellectual property relating
7# to a hardware implementation of the functionality of the software
8# licensed hereunder. You may use the software subject to the license

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55
56default_dtb = 'armv8_gem5_v1_big_little_2_2.dtb'
57default_kernel = 'vmlinux4.3.aarch64'
58default_disk = 'aarch64-ubuntu-trusty-headless.img'
59default_rcs = 'bootscript.rcS'
60
61default_mem_size= "2GB"
62
63
64class BigCluster(devices.CpuCluster):
65 def __init__(self, system, num_cpus, cpu_clock,
66 cpu_voltage="1.0V"):
67 cpu_config = [ CpuConfig.get("arm_detailed"), devices.L1I, devices.L1D,
68 devices.WalkCache, devices.L2 ]
69 super(BigCluster, self).__init__(system, num_cpus, cpu_clock,
70 cpu_voltage, *cpu_config)
71
72class LittleCluster(devices.CpuCluster):
73 def __init__(self, system, num_cpus, cpu_clock,
74 cpu_voltage="1.0V"):
75 cpu_config = [ CpuConfig.get("minor"), devices.L1I, devices.L1D,
76 devices.WalkCache, devices.L2 ]
77 super(LittleCluster, self).__init__(system, num_cpus, cpu_clock,
78 cpu_voltage, *cpu_config)
79
80
81def createSystem(kernel, bootscript, disks=[]):
82 sys = devices.SimpleSystem(kernel=SysPaths.binary(kernel),
83 readfile=bootscript,
84 machine_type="DTOnly")
85
86 mem_region = sys.realview._mem_regions[0]
87 sys.mem_ctrls = SimpleMemory(
88 range=AddrRange(start=mem_region[0], size=default_mem_size))
89 sys.mem_ctrls.port = sys.membus.master
90
91 sys.connect()

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103 for dev in sys.pci_vio_block:
104 sys.attach_pci(dev)
105
106 sys.realview.setupBootLoader(sys.membus, sys, SysPaths.binary)
107
108 return sys
109
110
111def main():
112 parser = argparse.ArgumentParser(
113 description="Generic ARM big.LITTLE configuration")
114
115 parser.add_argument("--restore-from", type=str, default=None,
116 help="Restore from checkpoint")
117 parser.add_argument("--dtb", type=str, default=default_dtb,
118 help="DTB file to load")

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138 help="Big CPU clock frequency")
139 parser.add_argument("--little-cpu-clock", type=str, default="1GHz",
140 help="Little CPU clock frequency")
141
142 m5.ticks.fixGlobalFrequency()
143
144 options = parser.parse_args()
145
146 kernel_cmd = [
147 "earlyprintk=pl011,0x1c090000",
148 "console=ttyAMA0",
149 "lpj=19988480",
150 "norandmaps",
151 "loglevel=8",
152 "mem=%s" % default_mem_size,
153 "root=/dev/vda1",
154 "rw",
155 "init=%s" % options.kernel_init,
156 "vmalloc=768MB",
157 ]
158
159 root = Root(full_system=True)
160
161 disks = default_disk if len(options.disk) == 0 else options.disk
162 system = createSystem(options.kernel, options.bootscript, disks=disks)
163
164 root.system = system
165 system.boot_osflags = " ".join(kernel_cmd)
166
167 AtomicCluster = devices.AtomicCluster
168
169 if options.big_cpus + options.little_cpus == 0:
170 m5.util.panic("Empty CPU clusters")
171
172 # big cluster
173 if options.big_cpus > 0:
174 if options.atomic:
175 system.bigCluster = AtomicCluster(system, options.big_cpus,
176 options.big_cpu_clock)
177 else:
178 system.bigCluster = BigCluster(system, options.big_cpus,
179 options.big_cpu_clock)
180 mem_mode = system.bigCluster.memoryMode()
181 # little cluster
182 if options.little_cpus > 0:
183 if options.atomic:
184 system.littleCluster = AtomicCluster(system, options.little_cpus,
185 options.little_cpu_clock)
186
187 else:
188 system.littleCluster = LittleCluster(system, options.little_cpus,
189 options.little_cpu_clock)
190 mem_mode = system.littleCluster.memoryMode()
191
192 if options.big_cpus > 0 and options.little_cpus > 0:
193 if system.bigCluster.memoryMode() != system.littleCluster.memoryMode():
194 m5.util.panic("Memory mode missmatch among CPU clusters")
195 system.mem_mode = mem_mode
196
197 # create caches
198 system.addCaches(options.caches, options.last_cache_level)
199 if not options.caches:
200 if options.big_cpus > 0 and system.bigCluster.requireCaches():
201 m5.util.panic("Big CPU model requires caches")
202 if options.little_cpus > 0 and system.littleCluster.requireCaches():
203 m5.util.panic("Little CPU model requires caches")
204
205 # Linux device tree
206 system.dtb_filename = SysPaths.binary(options.dtb)
207
208 # Get and load from the chkpt or simpoint checkpoint
209 if options.restore_from is not None:
210 m5.instantiate(options.restore_from)
211 else:
212 m5.instantiate()

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