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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2011 Google Inc.
* Copyright (C) 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.
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <console/console.h>
#include <arch/io.h>
#include <cbmem.h>
#include <device/device.h>
#include <baytrail/baytrail.h>
#include <baytrail/iosf.h>
#include <cpu/x86/msr.h>
#include <drivers/intel/fsp/fsp_util.h>
unsigned long get_top_of_ram(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.
*
* The entire memory map is shown in northcluster.c
*/
u32 tom = iosf_bunit_read(BUNIT_BMBOUND);
u32 bsmmrrl = iosf_bunit_read(BUNIT_SMRRL) << 20;
if (bsmmrrl) {
tom = bsmmrrl;
}
tom -= FSP_RESERVE_MEMORY_SIZE;
return (unsigned long) tom;
}
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