northbridge/intel: Rename ram_calc.c to memmap.c

Use a name consistent with the more recent soc/intel.

Change-Id: Ie69583f28f384eb49517203e1c3867f27e6272de
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34699
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/northbridge/intel/haswell/memmap.c

@@ -0,0 +1,50 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2011 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.
+ */
+
+// Use simple device model for this file even in ramstage
+#define __SIMPLE_DEVICE__
+
+#include <device/pci_ops.h>
+#include <cbmem.h>
+#include <stage_cache.h>
+#include "haswell.h"
+
+static uintptr_t smm_region_start(void)
+{
+	/*
+	 * Base of TSEG is top of usable DRAM below 4GiB. The register has
+	 * 1 MiB alignment.
+	 */
+	uintptr_t tom = pci_read_config32(PCI_DEV(0,0,0), TSEG);
+	return tom & ~((1 << 20) - 1);
+}
+
+void *cbmem_top(void)
+{
+	return (void *)smm_region_start();
+}
+
+/* Region of SMM space is reserved for multipurpose use. It falls below
+ * the IED region and above the SMM handler. */
+#define RESERVED_SMM_OFFSET \
+	(CONFIG_SMM_TSEG_SIZE - CONFIG_IED_REGION_SIZE - CONFIG_SMM_RESERVED_SIZE)
+
+void stage_cache_external_region(void **base, size_t *size)
+{
+	/* The ramstage cache lives in the TSEG region at RESERVED_SMM_OFFSET.
+	 * The top of RAM is defined to be the TSEG base address. */
+	*size = CONFIG_SMM_RESERVED_SIZE;
+	*base = (void *)((uint32_t)cbmem_top() + RESERVED_SMM_OFFSET);
+}