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72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
/*
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* Copyright (C) 2014 René Kijewski <rene.kijewski@fu-berlin.de>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* Functions to interact with the CMOS memory of the BIOS.
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*
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* @ingroup x86
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* @{
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* @file
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* @author René Kijewski <rene.kijewski@fu-berlin.de>
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*/
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#ifndef CPU__X86__CMOS__H__
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#define CPU__X86__CMOS__H__
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#include "x86_ports.h"
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define CMOS_ADDRESS (0x70)
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#define CMOS_DATA (0x71)
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#define CMOS_SERIAL_OFFS (0x41)
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#define CMOS_SERIAL_LEN (6)
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/**
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* @brief Read a CMOS register.
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* @returns The value of the CMOS register.
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*/
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uint8_t x86_cmos_read(int reg);
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/**
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* @brief Write a CMOS register.
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*/
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void x86_cmos_write(int reg, uint8_t value);
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/**
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* @brief Read serial number of the BIOS.
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*
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* Most -- if not all current -- BIOSes do not seem to store any serial number here.
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* This function won't cause an error, but the read serial might be some more or less random data.
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* The implementor of the board specific code should know whether the BIOS contains a serial number.
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*/
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void x86_cmos_serial(uint8_t (*serial)[CMOS_SERIAL_LEN]);
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#ifdef __cplusplus
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}
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#endif
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#endif
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/** @} */
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