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/*
* This file is part of the coreboot project.
*
* 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 <stdint.h>
#ifdef __ROMCC__
#include <arch/cbfs.h>
#else
#include <cbfs.h>
#endif
#include <pc80/mc146818rtc.h>
#if CONFIG(USE_OPTION_TABLE)
#include <option_table.h>
#endif
int cmos_error(void);
int cmos_error(void)
{
unsigned char reg_d;
/* See if the cmos error condition has been flagged */
reg_d = cmos_read(RTC_REG_D);
return (reg_d & RTC_VRT) == 0;
}
int cmos_chksum_valid(void);
int cmos_chksum_valid(void)
{
#if CONFIG(USE_OPTION_TABLE)
unsigned char addr;
u16 sum, old_sum;
sum = 0;
/* Compute the cmos checksum */
for (addr = LB_CKS_RANGE_START; addr <= LB_CKS_RANGE_END; addr++)
sum += cmos_read(addr);
/* Read the stored checksum */
old_sum = cmos_read(LB_CKS_LOC) << 8;
old_sum |= cmos_read(LB_CKS_LOC + 1);
return sum == old_sum;
#else
return 0;
#endif
}
#if CONFIG(USE_OPTION_TABLE)
void sanitize_cmos(void)
{
if (cmos_error() || !cmos_chksum_valid() ||
CONFIG(STATIC_OPTION_TABLE)) {
size_t length = 128;
const unsigned char *cmos_default =
#ifdef __ROMCC__
walkcbfs("cmos.default");
#else
cbfs_boot_map_with_leak("cmos.default",
CBFS_COMPONENT_CMOS_DEFAULT, &length);
#endif
if (cmos_default) {
size_t i;
cmos_disable_rtc();
for (i = 14; i < MIN(128, length); i++)
cmos_write_inner(cmos_default[i], i);
cmos_enable_rtc();
}
}
}
#endif
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