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/*
* 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);
}
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