x86_cmos.c
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/*
* Copyright (C) 2014 René Kijewski <rene.kijewski@fu-berlin.de>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @ingroup x86
* @{
*
* @file
* @brief Accessing the CMOS space of the BIOS.
*
* @author René Kijewski <rene.kijewski@fu-berlin.de>
*
* @}
*/
#include "x86_cmos.h"
uint8_t x86_cmos_read(int reg)
{
outb(CMOS_ADDRESS, reg);
io_wait();
return inb(CMOS_DATA);
}
void x86_cmos_write(int reg, uint8_t value)
{
outb(CMOS_ADDRESS, reg);
io_wait();
outb(CMOS_DATA, value);
}
void x86_cmos_serial(uint8_t (*serial)[CMOS_SERIAL_LEN])
{
for (unsigned i = 0; i < CMOS_SERIAL_LEN; ++i) {
(*serial)[i] = x86_cmos_read(CMOS_SERIAL_OFFS + i);
}
}