1# Copyright (c) 2012 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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65
66 def next(self):
67 self.cur_cpu = (self.cur_cpu + 1) % len(self.cpus)
68 return self.cpus[self.cur_cpu]
69
70 def first(self):
71 return self.cpus[self.first_cpu]
72
73def run_test(root, switcher=None, freq=1000):
74 """Test runner for CPU switcheroo tests.
75
76 The switcheroo test runner is used to switch CPUs in a system that
77 has been prepared for CPU switching. Such systems should have
78 multiple CPUs when they are instantiated, but only one should be
79 switched in. Such configurations can be created using the
80 base_config.BaseFSSwitcheroo class.
81

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86 Unlike most other test runners, this one automatically configures
87 the memory mode of the system based on the first CPU the switcher
88 reports.
89
90 Keyword Arguments:
91 switcher -- CPU switcher implementation. See Sequential for
92 an example implementation.
93 period -- Switching frequency in Hz.
94 """
95
96 if switcher == None:
97 switcher = Sequential(root.system.cpu)
98
99 current_cpu = switcher.first()
100 system = root.system
101 system.mem_mode = type(current_cpu).memory_mode()
102
103 # instantiate configuration
104 m5.instantiate()
105
106 # Determine the switching period, this has to be done after
107 # instantiating the system since the time base must be fixed.
108 period = m5.ticks.fromSeconds(1.0 / freq)
109 while True:
110 exit_event = m5.simulate(period)
111 exit_cause = exit_event.getCause()
112
113 if exit_cause == "simulate() limit reached":
114 next_cpu = switcher.next()
115
116 print "Switching CPUs..."
117 print "Next CPU: %s" % type(next_cpu)
118 m5.drain(system)
119 if current_cpu != next_cpu:
120 m5.switchCpus(system, [ (current_cpu, next_cpu) ],
121 do_drain=False)
122 else:
123 print "Source CPU and destination CPU are the same, skipping..."
124 m5.resume(system)
125 current_cpu = next_cpu
126 elif exit_cause == "target called exit()" or \
127 exit_cause == "m5_exit instruction encountered":
128
129 sys.exit(0)
130 else:
131 print "Test failed: Unknown exit cause: %s" % exit_cause
132 sys.exit(1)