Merge zizzer:/bk/newmem

into  zeep.pool:/z/saidi/work/m5.newmem.head

--HG--
extra : convert_revision : 326605820dce7641058eb0cdc0ddb2cc9602f67e

src/sim/system.cc

@@ -219,6 +219,8 @@ System::new_page()
 {
     Addr return_addr = page_ptr << LogVMPageSize;
     ++page_ptr;
+    if (return_addr >= physmem->size())
+        fatal("Out of memory, please increase size of physical memory.");
     return return_addr;
 }
 #endif