Add a functional port that is used to load the original binaries in FS

SE mode now has a port that goes to whatever toplevel mem object the
CPU sees that does the appropriate translation for syscall emulation

SConscript:
    translating port is a syscall emu only source
arch/alpha/system.cc:
base/loader/object_file.cc:
base/loader/object_file.hh:
    Use the new functional port to write the binaries into memory
cpu/cpu_exec_context.cc:
cpu/cpu_exec_context.hh:
cpu/simple/cpu.cc:
    We aren't always going to be writing straight to memory with syscalls
    support writing to a cache
mem/port.hh:
    Add a simple unidirectional functional port that panics on any incoming requests
mem/translating_port.hh:
    make translating port inherit from the simple port
sim/system.cc:
sim/system.hh:
    Add a functional port that is used to load the original binaries

--HG--
extra : convert_revision : 9096866d0b23e3aceea68394abb76e63c0f8fd8d

sim/system.cc

@@ -36,6 +36,16 @@ System::System(Params *p)
     kernelSymtab = new SymbolTable;
     debugSymbolTable = new SymbolTable;
 
+
+    /**
+     * Get a functional port to memory
+     */
+    Port *mem_port;
+    mem_port = physmem->getPort("functional");
+    functionalPort.setPeer(mem_port);
+    mem_port->setPeer(&functionalPort);
+
+
     /**
      * Load the kernel code into memory
      */
@@ -45,7 +55,7 @@ System::System(Params *p)
         fatal("Could not load kernel file %s", params()->kernel_path);
 
     // Load program sections into memory
-    kernel->loadSections(physmem, true);
+    kernel->loadSections(&functionalPort, LoadAddrMask);
 
     // setup entry points
     kernelStart = kernel->textBase();

sim/system.hh

@@ -36,6 +36,7 @@
 #include "base/misc.hh"
 #include "base/statistics.hh"
 #include "cpu/pc_event.hh"
+#include "mem/port.hh"
 #include "sim/sim_object.hh"
 #if FULL_SYSTEM
 #include "kern/system_events.hh"
@@ -76,6 +77,10 @@ class System : public SimObject
     Platform *platform;
     uint64_t init_param;
 
+    /** Port to physical memory used for writing object files into ram at
+     * boot.*/
+    FunctionalPort functionalPort;
+
     /** kernel symbol table */
     SymbolTable *kernelSymtab;