1 /*****************************************************************************\
3 *****************************************************************************
4 * Copyright (C) 2002-2005 The Regents of the University of California.
5 * Produced at the Lawrence Livermore National Laboratory.
6 * Written by David S. Peterson <dsp@llnl.gov> <dave_peterson@pobox.com>.
10 * This file is part of nvramtool, a utility for reading/writing coreboot
11 * parameters and displaying information from the coreboot table.
12 * For details, see http://coreboot.org/nvramtool.
14 * Please also read the file DISCLAIMER which is included in this software
17 * This program is free software; you can redistribute it and/or modify it
18 * under the terms of the GNU General Public License (as published by the
19 * Free Software Foundation) version 2, dated June 1991.
21 * This program is distributed in the hope that it will be useful, but
22 * WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
24 * conditions of the GNU General Public License for more details.
26 * You should have received a copy of the GNU General Public License along
27 * with this program; if not, write to the Free Software Foundation, Inc.,
28 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
29 \*****************************************************************************/
31 #ifndef NVRAMTOOL_CMOS_LOWLEVEL_H
32 #define NVRAMTOOL_CMOS_LOWLEVEL_H
37 #define CMOS_AREA_OUT_OF_RANGE (CMOS_RESULT_START + 0)
38 #define CMOS_AREA_OVERLAPS_RTC (CMOS_RESULT_START + 1)
39 #define CMOS_AREA_TOO_WIDE (CMOS_RESULT_START + 2)
41 unsigned long long cmos_read(const cmos_entry_t * e);
42 void cmos_write(const cmos_entry_t * e, unsigned long long value);
43 unsigned char cmos_read_byte(unsigned index);
44 void cmos_write_byte(unsigned index, unsigned char value);
45 void cmos_read_all(unsigned char data[]);
46 void cmos_write_all(unsigned char data[]);
47 void set_iopl(int level);
48 int verify_cmos_op(unsigned bit, unsigned length, cmos_entry_config_t config);
50 #define CMOS_SIZE 256 /* size of CMOS memory in bytes */
51 #define CMOS_RTC_AREA_SIZE 14 /* first 14 bytes control real time clock */
53 /****************************************************************************
54 * verify_cmos_byte_index
56 * Return 1 if 'index' does NOT specify a valid CMOS memory location. Else
58 ****************************************************************************/
59 static inline int verify_cmos_byte_index(unsigned index)
61 return (index < CMOS_RTC_AREA_SIZE) || (index >= CMOS_SIZE);
64 #endif /* NVRAMTOOL_CMOS_LOWLEVEL_H */