diff --git a/src/soc/nvidia/tegra210/cbmem.c b/src/soc/nvidia/tegra210/cbmem.c
new file mode 100644
index 0000000..c161a36
--- /dev/null
+++ b/src/soc/nvidia/tegra210/cbmem.c
@@ -0,0 +1,40 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc.
+ */
+
+#include <cbmem.h>
+#include <soc/addressmap.h>
+
+void *cbmem_top(void)
+{
+	static uintptr_t addr;
+
+	if (addr == 0) {
+		uintptr_t begin_mib;
+		uintptr_t end_mib;
+
+		memory_in_range_below_4gb(&begin_mib, &end_mib);
+		/* Make sure we consume everything up to 4GIB. */
+		if (end_mib == 4096)
+			addr = ~(uint32_t)0;
+		else
+			addr = end_mib << 20;
+	}
+
+	return (void *)addr;
+}