mirror of
https://git.proxmox.com/git/fwupd
synced 2025-05-26 02:42:46 +00:00
56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
/*
|
|
* Copyright (C) 2021 Sean Rhodes <sean@starlabs.systems>
|
|
*
|
|
* SPDX-License-Identifier: LGPL-2.1+
|
|
*/
|
|
#include "config.h"
|
|
|
|
#include <sys/io.h>
|
|
|
|
#include "fu-flashrom-cmos.h"
|
|
|
|
static gboolean
|
|
fu_flashrom_cmos_write(guint8 addr, guint8 val)
|
|
{
|
|
guint8 tmp;
|
|
|
|
/* Reject addresses in the second bank */
|
|
if (addr >= 128)
|
|
return FALSE;
|
|
|
|
/* Write the value to CMOS */
|
|
outb(addr, RTC_BASE_PORT);
|
|
outb(val, RTC_BASE_PORT + 1);
|
|
|
|
/* Read the value back from CMOS */
|
|
outb(addr, RTC_BASE_PORT);
|
|
tmp = inb(RTC_BASE_PORT + 1);
|
|
|
|
/* Check the read value against the written */
|
|
return (tmp == val);
|
|
}
|
|
|
|
gboolean
|
|
fu_flashrom_cmos_reset(GError **error)
|
|
{
|
|
/* Call ioperm() to grant us access to ports 0x70 and 0x71 */
|
|
if (ioperm(RTC_BASE_PORT, 2, TRUE) < 0) {
|
|
g_set_error_literal(error,
|
|
FWUPD_ERROR,
|
|
FWUPD_ERROR_READ,
|
|
"failed to gain access to ports 0x70 and 0x71");
|
|
return FALSE;
|
|
}
|
|
|
|
/* Write a default value to the CMOS checksum */
|
|
if ((!fu_flashrom_cmos_write(CMOS_CHECKSUM_OFFSET, 0xff)) ||
|
|
(!fu_flashrom_cmos_write(CMOS_CHECKSUM_OFFSET + 1, 0xff))) {
|
|
g_set_error_literal(error, FWUPD_ERROR, FWUPD_ERROR_READ, "failed to reset CMOS");
|
|
return FALSE;
|
|
}
|
|
|
|
/* success */
|
|
|
|
return TRUE;
|
|
}
|