84 lines
1.5 KiB
C
84 lines
1.5 KiB
C
#ifndef _RTC_H
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#define _RTC_H
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/** @file
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*
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* CMOS Real-Time Clock (RTC)
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*
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* The CMOS/RTC registers are documented (with varying degrees of
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* accuracy and consistency) at
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*
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* http://www.nondot.org/sabre/os/files/MiscHW/RealtimeClockFAQ.txt
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* http://wiki.osdev.org/RTC
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* http://wiki.osdev.org/CMOS
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <pic8259.h>
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/** RTC IRQ */
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#define RTC_IRQ 8
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/** RTC interrupt vector */
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#define RTC_INT IRQ_INT ( RTC_IRQ )
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/** CMOS/RTC address (and NMI) register */
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#define CMOS_ADDRESS 0x70
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/** NMI disable bit */
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#define CMOS_DISABLE_NMI 0x80
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/** CMOS/RTC data register */
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#define CMOS_DATA 0x71
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/** RTC seconds */
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#define RTC_SEC 0x00
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/** RTC minutes */
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#define RTC_MIN 0x02
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/** RTC hours */
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#define RTC_HOUR 0x04
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/** RTC weekday */
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#define RTC_WDAY 0x06
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/** RTC day of month */
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#define RTC_MDAY 0x07
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/** RTC month */
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#define RTC_MON 0x08
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/** RTC year */
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#define RTC_YEAR 0x09
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/** RTC status register A */
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#define RTC_STATUS_A 0x0a
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/** RTC update in progress bit */
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#define RTC_STATUS_A_UPDATE_IN_PROGRESS 0x80
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/** RTC status register B */
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#define RTC_STATUS_B 0x0b
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/** RTC 24 hour format bit */
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#define RTC_STATUS_B_24_HOUR 0x02
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/** RTC binary mode bit */
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#define RTC_STATUS_B_BINARY 0x04
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/** RTC Periodic Interrupt Enabled bit */
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#define RTC_STATUS_B_PIE 0x40
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/** RTC status register C */
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#define RTC_STATUS_C 0x0c
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/** RTC status register D */
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#define RTC_STATUS_D 0x0d
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/** CMOS default address */
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#define CMOS_DEFAULT_ADDRESS RTC_STATUS_D
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#endif /* _RTC_H */
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