SE/FS: Put platform pointers in fewer objects.

Not all objects need a platform pointer, and having one creates a dependence
on their being a platform object. This change removes the platform pointer to
from the base device object and moves it into subclasses that actually need
it.

src/arch/x86/X86LocalApic.py

@@ -26,7 +26,9 @@
 #
 # Authors: Gabe Black
 
+from m5.defines import buildEnv
 from m5.params import *
+from m5.proxy import *
 from Device import BasicPioDevice
 
 class X86LocalApic(BasicPioDevice):
@@ -36,3 +38,6 @@ class X86LocalApic(BasicPioDevice):
     int_port = Port("Port for sending and receiving interrupt messages")
     int_latency = Param.Latency('1ns', \
             "Latency for an interrupt to propagate through this device.")
+    if buildEnv['FULL_SYSTEM']: # No platform in SE mode.
+        platform = Param.Platform(Parent.any,
+                "Platform this device is part of.")

src/arch/x86/interrupts.cc

@@ -302,10 +302,11 @@ X86ISA::Interrupts::init()
     //
     BasicPioDevice::init();
     IntDev::init();
-
+#if FULL_SYSTEM
     Pc * pc = dynamic_cast<Pc *>(platform);
     assert(pc);
     pc->southBridge->ioApic->registerLocalApic(initialApicId, this);
+#endif
 }
 
 
@@ -613,6 +614,9 @@ X86ISA::Interrupts::Interrupts(Params * p) :
     pendingStartup(false), startupVector(0),
     startedUp(false), pendingUnmaskableInt(false),
     pendingIPIs(0), cpu(NULL)
+#if FULL_SYSTEM
+    , platform(p->platform)
+#endif
 {
     pioSize = PageBytes;
     memset(regs, 0, sizeof(regs));

src/arch/x86/interrupts.hh

@@ -44,6 +44,7 @@
 #include "arch/x86/faults.hh"
 #include "arch/x86/intmessage.hh"
 #include "base/bitfield.hh"
+#include "config/full_system.hh"
 #include "cpu/thread_context.hh"
 #include "dev/x86/intdev.hh"
 #include "dev/io_device.hh"
@@ -175,6 +176,10 @@ class Interrupts : public BasicPioDevice, IntDev
 
     int initialApicId;
 
+#if FULL_SYSTEM
+    Platform *platform;
+#endif
+
   public:
     /*
      * Params stuff.