/usr/include/smbios_c/cmos.h is in libsmbios-dev 2.3.1-1+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*
* Copyright (C) 2005 Dell Inc.
* by Michael Brown <Michael_E_Brown@dell.com>
* Licensed under the Open Software License version 2.1
*
* Alternatively, you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License,
* or (at your option) any later version.
* 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.
*/
#ifndef C_CMOS_H
#define C_CMOS_H
// include smbios_c/compat.h first
#include "smbios_c/compat.h"
#include "smbios_c/types.h"
EXTERN_C_BEGIN;
/** Read byte from CMOS.
* @param byte pointer to buffer were byte will be stored
* @param indexPort the io port where we write the offset
* @param dataPort the io port where we will read the resulting value
* @param offset the offset into cmos (usually cmos is 256 byte banks)
* @return 0 on success, < 0 on failure
*/
LIBSMBIOS_C_DLL_SPEC int cmos_read_byte (u8 *byte, u32 indexPort, u32 dataPort, u32 offset);
/** Write byte to CMOS.
* @param byte byte to write
* @param indexPort the io port where we write the offset
* @param dataPort the io port where we will write the byte
* @param offset the offset into cmos (usually cmos is 256 byte banks)
* @return 0 on success, < 0 on failure
*/
LIBSMBIOS_C_DLL_SPEC int cmos_write_byte(u8 byte, u32 indexPort, u32 dataPort, u32 offset);
/** Run all registered CMOS callbacks.
* Higher layers can register callbacks that are run when any byte in CMOS is
* changed. Presently, all these callbacks are used to update checksums in
* CMOS. If do_update is false, return code indicates if checksums are
* currently correct.
* @param do_update should callback update checksum if it is wrong
* @return The return value of all callbacks is 'or'-ed together. Checksum
* callbacks return 0 if checksum is good and do_update is false. (otherwise
* they just write the correct checksum)
*/
LIBSMBIOS_C_DLL_SPEC int cmos_run_callbacks(bool do_update);
/** Returns string describing the last error condition.
* Can return 0. The buffer used is guaranteed to be valid until the next call
* to any cmos_* function. Copy the contents if you need it longer.
*/
LIBSMBIOS_C_DLL_SPEC const char *cmos_strerror();
EXTERN_C_END;
#endif /* CMOS_H */
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