142 lines
4.2 KiB
PHP
142 lines
4.2 KiB
PHP
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;/*
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;++
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;
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; Copyright (c) 1989 Microsoft Corporation
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;
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; Module Name:
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;
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; ixcmos.inc
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;
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; Abstract:
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;
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; This module contains common definitions used by the CMOS.
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;
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; Author:
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;
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; Landy Wang (corollary!landy) 04-Dec-1992
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;
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; (Moved from ixclock.asm)
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;
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;--
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;
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; _HalpAcquireCmosSpinLock and _HalpReleaseCmosSpinLock
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; must be called before accessing the CMOS in both uniprocessor
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; and multiprocessor systems.
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RTCIRQ EQU 8 ; IRQ number for RTC interrupt
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CMOS_CONTROL_PORT EQU 70h ; command port for cmos
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CMOS_DATA_PORT EQU 71h ; cmos data port
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REGISTER_B_ENABLE_PERIODIC_INTERRUPT EQU 01000010B
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; RT/CMOS Register 'B' Init byte
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; Values for byte shown are
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; Bit 7 = Update inhibit
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; Bit 6 = Periodic interrupt enable
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; Bit 5 = Alarm interrupt disable
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; Bit 4 = Update interrupt disable
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; Bit 3 = Square wave disable
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; Bit 2 = BCD data format
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; Bit 1 = 24 hour time mode
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; Bit 0 = Daylight Savings disable
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REGISTER_B_DISABLE_PERIODIC_INTERRUPT EQU 00000010B
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REGISTER_B_ENABLE_ALARM_INTERRUPT EQU 00100000B
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REGISTER_B_DISABLE_ALARM_INTERRUPT EQU 00000000B
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REGISTER_B_24HOUR_MODE EQU 00000010B
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;
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; CMOS_READ
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;
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; Description: This macro reads a byte from the CMOS register specified
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; in (AL).
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;
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; Parameter: (AL) = address/register to read
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; Returns: (AL) = data
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;
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CMOS_READ MACRO
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OUT CMOS_CONTROL_PORT,AL ; ADDRESS LOCATION AND DISABLE NMI
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IODelay ; I/O DELAY
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IN AL,CMOS_DATA_PORT ; READ IN REQUESTED CMOS DATA
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IODelay ; I/O DELAY
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ENDM
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;
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; CMOS_WRITE
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;
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; Description: This macro reads a byte from the CMOS register specified
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; in (AL).
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;
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; Parameter: (AL) = address/register to read
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; (AH) = data to be written
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;
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; Return: None
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;
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CMOS_WRITE MACRO
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OUT CMOS_CONTROL_PORT,AL ; ADDRESS LOCATION AND DISABLE NMI
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IODelay ; I/O DELAY
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MOV AL,AH ; (AL) = DATA
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OUT CMOS_DATA_PORT,AL ; PLACE IN REQUESTED CMOS LOCATION
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IODelay ; I/O DELAY
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ENDM
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CMOS_STATUS_BUSY EQU 80H ; Time update in progress
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RTC_OFFSET_SECOND EQU 0 ; second field of RTC memory
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RTC_OFFSET_SECOND_ALARM EQU 1 ; second alarm field of RTC memory
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RTC_OFFSET_MINUTE EQU 2 ; minute field of RTC memory
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RTC_OFFSET_MINUTE_ALARM EQU 3 ; minute alarm field of RTC memory
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RTC_OFFSET_HOUR EQU 4 ; hour field of RTC memory
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RTC_OFFSET_HOUR_ALARM EQU 5 ; hour alarm field of RTC memory
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RTC_OFFSET_DAY_OF_WEEK EQU 6 ; day-of-week field of RTC memory
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RTC_OFFSET_DATE_OF_MONTH EQU 7 ; date-of-month field of RTC memory
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RTC_OFFSET_MONTH EQU 8 ; month field of RTC memory
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RTC_OFFSET_YEAR EQU 9 ; year field of RTC memory
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RTC_OFFSET_CENTURY_MCA EQU 37h ; Century field of RTC memory for MCA
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RTC_OFFSET_CENTURY EQU 32h ; Century field of RTC memory
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RTC_OFFSET_CENTURY_DS EQU 148h ; Bank 1, 48. Century field for DS
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BANK1 EQU 100h
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;
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; BCD_TO_BIN
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;
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; Description: Convert BCD value to binary
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;
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; Parameter:
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; Input: (AL) = 2 digit BCD number to convert
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; Output: (AX) = Binary equivalent (all in AL)
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;
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; Return: None.
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;
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BCD_TO_BIN macro
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xor ah,ah
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rol ax,4
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ror al,4
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aad
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endm
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;
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; BIN_TO_BCD
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;
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; Description: Convert binary value to BCD.
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;
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; Parameter:
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; Input: (AL) = binary value to be converted.
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; Output: (AX) = BCD (all in AL)
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;
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; Return: None.
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;
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BIN_TO_BCD macro
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aam
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rol al, 4
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ror ax, 4
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endm
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