blob: 59de34890f7d6786285e868ec521defdd73dd37c [file] [log] [blame]
/*
* This file is part of the coreboot project.
*
* Copyright 2017 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.
*/
#include <arch/acpi.h>
#include <soc/southbridge.h>
#include <amdblocks/acpimmio.h>
#include <security/vboot/vboot_common.h>
#include <security/vboot/vbnv.h>
#include <pc80/mc146818rtc.h>
int vbnv_cmos_failed(void)
{
/* If CMOS power has failed, the century will be set to 0xff */
return cmos_read(RTC_CLK_ALTCENTURY) == 0xff;
}