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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
*/
/**
* Functions to interact with the CMOS memory of the BIOS.
*
* @ingroup x86
* @{
* @file
* @author René Kijewski <rene.kijewski@fu-berlin.de>
*/
#ifndef CPU__X86__CMOS__H__
#define CPU__X86__CMOS__H__
#include "x86_ports.h"
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
#define CMOS_ADDRESS (0x70)
#define CMOS_DATA (0x71)
#define CMOS_SERIAL_OFFS (0x41)
#define CMOS_SERIAL_LEN (6)
/**
* @brief Read a CMOS register.
* @returns The value of the CMOS register.
*/
uint8_t x86_cmos_read(int reg);
/**
* @brief Write a CMOS register.
*/
void x86_cmos_write(int reg, uint8_t value);
/**
* @brief Read serial number of the BIOS.
*
* Most -- if not all current -- BIOSes do not seem to store any serial number here.
* This function won't cause an error, but the read serial might be some more or less random data.
* The implementor of the board specific code should know whether the BIOS contains a serial number.
*/
void x86_cmos_serial(uint8_t (*serial)[CMOS_SERIAL_LEN]);
#ifdef __cplusplus
}
#endif
#endif
/** @} */
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