diff -r 3a195e2117c0 -r 69ef0954691c src/arch/x86/vtophys.cc
--- a/src/arch/x86/vtophys.cc	Thu Jan 20 15:35:29 2011 -0800
+++ b/src/arch/x86/vtophys.cc	Thu Jan 20 16:36:27 2011 -0800
@@ -39,7 +39,13 @@
 
 #include <string>
 
+#include "arch/x86/faults.hh"
+#include "arch/x86/pagetable_walker.hh"
+#include "arch/x86/tlb.hh"
 #include "arch/x86/vtophys.hh"
+#include "base/trace.hh"
+#include "config/full_system.hh"
+#include "cpu/thread_context.hh"
 
 using namespace std;
 
@@ -47,11 +53,28 @@
 {
     Addr vtophys(Addr vaddr)
     {
+#if FULL_SYSTEM
+        panic("Need access to page tables\n");
+#endif
         return vaddr;
     }
 
     Addr vtophys(ThreadContext *tc, Addr addr)
     {
+#if FULL_SYSTEM
+        RequestPtr req = new Request;
+        req->setVirt(0, addr, 0, 0, 0);
+        Walker *walker = tc->getDTBPtr()->getWalker();
+        FunctionalTranslation trans;
+        Fault fault = walker->startFunctional(tc, &trans, req, BaseTLB::Read);
+        if (fault != NoFault)
+            panic("vtophys page walk returned fault\n");
+        Addr masked_addr = addr & (trans.getSize() - 1);
+        Addr paddr = req->getPaddr() | masked_addr;
+        delete req;
+        DPRINTF(VtoPhys, "vtophys(%#x) -> %#x\n", addr, paddr);
+        return paddr;
+#endif
         return addr;
     }
 }
diff -r 3a195e2117c0 -r 69ef0954691c src/arch/x86/vtophys.hh
--- a/src/arch/x86/vtophys.hh	Thu Jan 20 15:35:29 2011 -0800
+++ b/src/arch/x86/vtophys.hh	Thu Jan 20 16:36:27 2011 -0800
@@ -43,6 +43,7 @@
 #include "arch/x86/isa_traits.hh"
 #include "arch/x86/pagetable.hh"
 #include "base/types.hh"
+#include "sim/tlb.hh"
 
 class ThreadContext;
 class FunctionalPort;
@@ -50,6 +51,38 @@
 namespace X86ISA
 {
 
+class FunctionalTranslation : public BaseTLB::Translation
+{
+  private:
+    int size;
+
+  public:
+    FunctionalTranslation()
+        : size(0)
+    {
+    }
+
+    int
+    getSize()
+    {
+        return size;
+    }
+
+    void
+    setSize(int _size)
+    {
+        size = _size;
+    }
+
+    void
+    finish(Fault fault, RequestPtr req, ThreadContext *tc,
+           BaseTLB::Mode mode)
+    {
+        delete this;
+    }
+};
+
+
 Addr vtophys(Addr vaddr);
 Addr vtophys(ThreadContext *tc, Addr vaddr);