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/*
* 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.
*
* 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.
*/
// Use simple device model for this file even in ramstage
#define __SIMPLE_DEVICE__
#include <arch/io.h>
#include <cbmem.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 alignement.
*/
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();
}
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