1 files changed, 42 insertions, 0 deletions
diff --git a/src/northbridge/intel/fsp_rangeley/memmap.c b/src/northbridge/intel/fsp_rangeley/memmap.c
new file mode 100644
index 0000000000..da9ed71a67
--- /dev/null
+++ b/src/northbridge/intel/fsp_rangeley/memmap.c
@@ -0,0 +1,42 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2011 Google Inc.
+ * Copyright (C) 2013-2014 Sage Electronic Engineering, LLC.
+ *
+ * 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.
+ */
+
+#include <cbmem.h>
+#include <device/pci_def.h>
+#include <drivers/intel/fsp1_0/fsp_util.h>
+
+#include "northbridge.h"
+
+static uintptr_t smm_region_start(void)
+{
+	/*
+	 * Calculate the top of usable (low) DRAM.
+	 * The FSP's reserved memory sits just below the SMM region,
+	 * allowing calculation of the top of usable memory.
+	 */
+	uintptr_t tom = sideband_read(B_UNIT, BMBOUND);
+	uintptr_t bsmmrrl = sideband_read(B_UNIT, BSMMRRL) << 20;
+	if (bsmmrrl) {
+		tom = bsmmrrl;
+	}
+
+	return tom;
+}
+
+void *cbmem_top(void)
+{
+	return (void *) (smm_region_start() - FSP_RESERVE_MEMORY_SIZE);
+}