config: Add a CPU clock command-line option

This patch adds a 'cpu_clock' command-line option and uses the value
to assign clocks to components running at the CPU speed (L1 and L2
including the L2-bus). The configuration scripts are updated
accordingly.

The 'clock' option is left unchanged in this patch as it is still used
by a number of components. In follow-on patches the latter will be
disambiguated further.

configs/common/CacheConfig.py

@@ -64,12 +64,12 @@ def config_cache(options, system):
         # are not connected using addTwoLevelCacheHierarchy. Use the
         # same clock as the CPUs, and set the L1-to-L2 bus width to 32
         # bytes (256 bits).
-        system.l2 = l2_cache_class(clock=options.clock,
+        system.l2 = l2_cache_class(clock=options.cpu_clock,
                                    size=options.l2_size,
                                    assoc=options.l2_assoc,
                                    block_size=options.cacheline_size)
 
-        system.tol2bus = CoherentBus(clock = options.clock, width = 32)
+        system.tol2bus = CoherentBus(clock = options.cpu_clock, width = 32)
         system.l2.cpu_side = system.tol2bus.master
         system.l2.mem_side = system.membus.slave
 

configs/common/Options.py

@@ -78,6 +78,9 @@ def addCommonOptions(parser):
     parser.add_option("--simpoint-interval", type="int", default=10000000,
                       help="SimPoint interval in num of instructions")
     parser.add_option("--clock", action="store", type="string", default='2GHz')
+    parser.add_option("--cpu-clock", action="store", type="string",
+                      default='2GHz',
+                      help="Clock for blocks running at CPU speed")
     parser.add_option("--num-dirs", type="int", default=1)
     parser.add_option("--num-l2caches", type="int", default=1)
     parser.add_option("--num-l3caches", type="int", default=1)

configs/example/fs.py

@@ -81,8 +81,8 @@ def is_kvm_cpu(cpu_class):
 # system under test can be any CPU
 (TestCPUClass, test_mem_mode, FutureClass) = Simulation.setCPUClass(options)
 
-TestCPUClass.clock = options.clock
-DriveCPUClass.clock = options.clock
+TestCPUClass.clock = options.cpu_clock
+DriveCPUClass.clock = options.cpu_clock
 
 # Match the memories with the CPUs, the driver system always simple,
 # and based on the options for the test system

configs/example/ruby_fs.py

@@ -80,7 +80,7 @@ if not (options.cpu_type == "detailed" or options.cpu_type == "timing"):
     sys.exit(1)
 (CPUClass, test_mem_mode, FutureClass) = Simulation.setCPUClass(options)
 
-CPUClass.clock = options.clock
+CPUClass.clock = options.cpu_clock
 
 TestMemClass = Simulation.setMemClass(options)
 

configs/example/se.py

@@ -147,7 +147,7 @@ else:
 
 
 (CPUClass, test_mem_mode, FutureClass) = Simulation.setCPUClass(options)
-CPUClass.clock = options.clock
+CPUClass.clock = options.cpu_clock
 CPUClass.numThreads = numThreads
 
 MemClass = Simulation.setMemClass(options)