diff --git a/src/northbridge/intel/gm45/ram_calc.c b/src/northbridge/intel/gm45/ram_calc.c
index c8c15d3..d9d3357 100644
--- a/src/northbridge/intel/gm45/ram_calc.c
+++ b/src/northbridge/intel/gm45/ram_calc.c
@@ -86,7 +86,7 @@
 	}
 }
 
-unsigned long get_top_of_ram(void)
+static uintptr_t smm_region_start(void)
 {
 	const pci_devfn_t dev = PCI_DEV(0, 0, 0);
 
@@ -105,3 +105,8 @@
 	}
 	return tor;
 }
+
+void *cbmem_top(void)
+{
+	return (void *) smm_region_start();
+}