coreboot-kgpe-d16/src/soc/intel/apollolake/memmap.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2015 Intel Corp.
 * (Written by Andrey Petrov <andrey.petrov@intel.com> for Intel Corp.)
 *
 * 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; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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 <arch/io.h>
#include <cbmem.h>
#include <device/pci.h>
#include <soc/northbridge.h>
#include <soc/pci_devs.h>

static uintptr_t smm_region_start(void)
{
	return ALIGN_DOWN(pci_read_config32(NB_DEV_ROOT, TSEG), 1*MiB);
}

void *cbmem_top(void)
{
	return (void *)smm_region_start();
}