1 | ; Project name : Assembly Library
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2 | ; Description : Defines for accessing CMOS.
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3 |
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4 | ;
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5 | ; XTIDE Universal BIOS and Associated Tools
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6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2018 by XTIDE Universal BIOS Team.
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7 | ;
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8 | ; This program is free software; you can redistribute it and/or modify
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9 | ; it under the terms of the GNU General Public License as published by
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10 | ; the Free Software Foundation; either version 2 of the License, or
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11 | ; (at your option) any later version.
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12 | ;
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13 | ; This program is distributed in the hope that it will be useful,
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14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 | ; GNU General Public License for more details.
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17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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18 | ;
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19 |
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20 | %ifndef CMOS_INC
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21 | %define CMOS_INC
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22 |
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23 | ; CMOS Ports
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24 | ; Note that a data register read or write must follow every write to the address register
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25 | CMOS_INDEX_REGISTER EQU 70h ; Is this write only?
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26 | CMOS_DATA_REGISTER EQU 71h
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27 |
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28 | FLG_CMOS_INDEX_NMI_DISABLE EQU (1<<7) ; CMOS Index Register bit 7 is NMI disable/enable bit
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29 |
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30 |
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31 | ; Almost all of the CMOS locations are vendor specific and
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32 | ; there is very little standardation
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33 | HARD_DISK_TYPES EQU 12h ; Windows 95 reads this to check if IDE drives
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34 | ; are present so it should be safe to access this.
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35 | ; Bits 0...3 Hard Disk 1 type (Primary Slave)
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36 | ; Bits 4...7 Hard Disk 0 type (Primary Master)
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37 | ; Fh = Types 16...47 (defined elsewhere in CMOS)
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38 | CHECKSUM_OF_BYTES_10hTo2Dh_LOW EQU 2Fh ; Most BIOSes store checksum of bytes 10h to 2Dh here
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39 | CHECKSUM_OF_BYTES_10hTo2Dh_HIGH EQU 2Eh ; High byte of the checksum
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40 |
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41 |
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42 | %endif ; CMOS_INC
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