System: Push boot_cpu_frequency down into the subclasses that actually use it.

This parameter depends on a number of coincidences to work properly. First,
there must be an array assigned to system called "cpu" even though there's no
parameter called that. Second, the items in the "cpu" array have to have a
"clock" parameter which has a "frequency" member. This is true of the normal
CPUs, but isn't true of the memory tester CPUs. This happened to work before
because the memory tester CPUs were only used in SE mode where this parameter
was being excluded. Since everything is being pulled into a common binary,
this won't work any more. Since the boot_cpu_frequency parameter is only used
by Alpha's Linux System object (and Mips's through copy and paste), the
definition of that parameter is moved down to those objects specifically.

src/arch/alpha/AlphaSystem.py

@@ -27,6 +27,7 @@
 # Authors: Nathan Binkert
 
 from m5.params import *
+from m5.proxy import *
 from System import System
 
 class AlphaSystem(System):
@@ -42,6 +43,9 @@ class LinuxAlphaSystem(AlphaSystem):
     system_type = 34
     system_rev = 1 << 10
 
+    boot_cpu_frequency = Param.Frequency(Self.cpu[0].clock.frequency,
+                                         "boot processor frequency")
+
 class FreebsdAlphaSystem(AlphaSystem):
     type = 'FreebsdAlphaSystem'
     system_type = 34

src/arch/mips/MipsSystem.py

@@ -49,6 +49,9 @@ if buildEnv['FULL_SYSTEM']:
         system_type = 34
         system_rev = 1 << 10
 
+        boot_cpu_frequency = Param.Frequency(Self.cpu[0].clock.frequency,
+                                             "boot processor frequency")
+
     class BareIronMipsSystem(MipsSystem):
         type = 'BareIronMipsSystem'
         bare_iron = True

src/sim/System.py

@@ -62,8 +62,6 @@ class System(SimObject):
     work_cpus_ckpt_count = Param.Counter(0,
         "create checkpoint when active cpu count value is reached")
 
-    boot_cpu_frequency = Param.Frequency(Self.cpu[0].clock.frequency,
-                                         "boot processor frequency")
     init_param = Param.UInt64(0, "numerical value to pass into simulator")
     boot_osflags = Param.String("a", "boot flags to pass to the kernel")
     kernel = Param.String("", "file that contains the kernel code")