mirror of
https://github.com/reactos/reactos.git
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77 lines
2 KiB
C
77 lines
2 KiB
C
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/*
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* COPYRIGHT: GPL - See COPYING in the top level directory
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* PROJECT: ReactOS Virtual DOS Machine
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* FILE: cmos.h
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* PURPOSE: Real Time Clock emulation (header file)
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* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
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*/
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#ifndef _CMOS_H_
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#define _CMOS_H_
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/* INCLUDES *******************************************************************/
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#include "ntvdm.h"
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/* DEFINES ********************************************************************/
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#define RTC_IRQ_NUMBER 8
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#define CMOS_ADDRESS_PORT 0x70
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#define CMOS_DATA_PORT 0x71
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#define CMOS_DISABLE_NMI (1 << 7)
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#define CMOS_BATTERY_OK 0x80
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/* Status Register B flags */
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#define CMOS_STB_24HOUR (1 << 1)
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#define CMOS_STB_BINARY (1 << 2)
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#define CMOS_STB_SQUARE_WAVE (1 << 3)
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#define CMOS_STB_INT_ON_UPDATE (1 << 4)
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#define CMOS_STB_INT_ON_ALARM (1 << 5)
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#define CMOS_STB_INT_PERIODIC (1 << 6)
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/* Status Register C flags */
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#define CMOS_STC_UF CMOS_STB_INT_ON_UPDATE
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#define CMOS_STC_AF CMOS_STB_INT_ON_ALARM
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#define CMOS_STC_PF CMOS_STB_INT_PERIODIC
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#define CMOS_STC_IRQF (1 << 7)
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/* Default register values */
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#define CMOS_DEFAULT_STA 0x26
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#define CMOS_DEFAULT_STB CMOS_STB_24HOUR
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/* BCD-Binary conversion */
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#define BINARY_TO_BCD(x) (((x / 10) << 4) | (x % 10))
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#define BCD_TO_BINARY(x) (((x >> 4) * 10) + (x & 0x0F))
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typedef enum _CMOS_REGISTERS
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{
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CMOS_REG_SECONDS,
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CMOS_REG_ALARM_SEC,
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CMOS_REG_MINUTES,
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CMOS_REG_ALARM_MIN,
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CMOS_REG_HOURS,
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CMOS_REG_ALARM_HRS,
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CMOS_REG_DAY_OF_WEEK,
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CMOS_REG_DAY,
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CMOS_REG_MONTH,
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CMOS_REG_YEAR,
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CMOS_REG_STATUS_A,
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CMOS_REG_STATUS_B,
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CMOS_REG_STATUS_C,
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CMOS_REG_STATUS_D,
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CMOS_REG_DIAGNOSTICS,
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CMOS_REG_MAX
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} CMOS_REGISTERS, *PCMOS_REGISTERS;
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BOOLEAN IsNmiEnabled(VOID);
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VOID CmosWriteAddress(BYTE Value);
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BYTE CmosReadData(VOID);
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VOID CmosWriteData(BYTE Value);
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DWORD RtcGetTicksPerSecond(VOID);
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VOID RtcPeriodicTick(VOID);
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VOID RtcTimeUpdate(VOID);
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#endif // _CMOS_H_
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/* EOF */
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