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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2007-2009 coresystems GmbH
*
* 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
*/
// Use simple device model for this file even in ramstage
#define __SIMPLE_DEVICE__
#include <arch/io.h>
#include <cbmem.h>
#include "i945.h"
unsigned long get_top_of_ram(void)
{
u32 tom;
if (pci_read_config8(PCI_DEV(0, 0x0, 0), DEVEN) & (DEVEN_D2F0 | DEVEN_D2F1)) {
/* IGD enabled, get top of Memory from BSM register */
tom = pci_read_config32(PCI_DEV(0,2,0), BSM);
} else {
tom = (pci_read_config8(PCI_DEV(0,0,0), TOLUD) & 0xf7) << 24;
}
/* if TSEG enabled subtract size */
switch(pci_read_config8(PCI_DEV(0, 0, 0), ESMRAM) & 0x07) {
case 0x01:
/* 1MB TSEG */
tom -= 0x100000;
break;
case 0x03:
/* 2MB TSEG */
tom -= 0x200000;
break;
case 0x05:
/* 8MB TSEG */
tom -= 0x800000;
break;
default:
/* TSEG either disabled or invalid */
break;
}
return (unsigned long) tom;
}
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