source: xtideuniversalbios/trunk/Assembly_Library/Inc/CMOS.inc@ 594

; Project name  :   Assembly Library
; Description   :   Defines for accessing CMOS.

;
; XTIDE Universal BIOS and Associated Tools
; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2018 by XTIDE Universal BIOS Team.
;
; This program is free software; 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.
; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
;

%ifndef CMOS_INC
%define CMOS_INC

; CMOS Ports
; Note that a data register read or write must follow every write to the address register
CMOS_INDEX_REGISTER             EQU     70h     ; Is this write only?
CMOS_DATA_REGISTER              EQU     71h

FLG_CMOS_INDEX_NMI_DISABLE      EQU     (1<<7)  ; CMOS Index Register bit 7 is NMI disable/enable bit


; Almost all of the CMOS locations are vendor specific and
; there is very little standardation
HARD_DISK_TYPES                 EQU     12h     ; Windows 95 reads this to check if IDE drives
                                                ; are present so it should be safe to access this.
                                                ; Bits 0...3 Hard Disk 1 type (Primary Slave)
                                                ; Bits 4...7 Hard Disk 0 type (Primary Master)
                                                ; Fh = Types 16...47 (defined elsewhere in CMOS)
CHECKSUM_OF_BYTES_10hTo2Dh_LOW  EQU     2Fh     ; Most BIOSes store checksum of bytes 10h to 2Dh here
CHECKSUM_OF_BYTES_10hTo2Dh_HIGH EQU     2Eh     ; High byte of the checksum


%endif ; CMOS_INC