mirror of
https://github.com/reactos/reactos.git
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139 lines
3.8 KiB
C
139 lines
3.8 KiB
C
/*
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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: CMOS Real Time Clock emulation
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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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#define WRITE_CMOS_DATA(Cmos, Value) \
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((Cmos).StatusRegB & CMOS_STB_BINARY) ? (Value) : BCD_TO_BINARY(Value)
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#define READ_CMOS_DATA(Cmos, Value) \
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((Cmos).StatusRegB & CMOS_STB_BINARY) ? (Value) : BINARY_TO_BCD(Value)
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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_SHUTDOWN_STATUS,
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CMOS_REG_BASE_MEMORY_LOW = 0x15,
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CMOS_REG_BASE_MEMORY_HIGH = 0x16,
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CMOS_REG_EXT_MEMORY_LOW = 0x17,
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CMOS_REG_EXT_MEMORY_HIGH = 0x18,
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CMOS_REG_ACTUAL_EXT_MEMORY_LOW = 0x30,
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CMOS_REG_ACTUAL_EXT_MEMORY_HIGH = 0x31,
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CMOS_REG_MAX = 0x40
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} CMOS_REGISTERS, *PCMOS_REGISTERS;
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/*
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* CMOS Memory Map
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*
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* See the following documentation for more information:
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* http://www.intel-assembler.it/portale/5/cmos-memory-map-123/cmos-memory-map-123.asp
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* http://wiki.osdev.org/CMOS
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* http://www.walshcomptech.com/ohlandl/config/cmos_registers.html
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* http://www.fysnet.net/cmosinfo.htm
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* http://www.bioscentral.com/misc/cmosmap.htm
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*/
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#pragma pack(push, 1)
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typedef struct
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{
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BYTE Second; // 0x00
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BYTE AlarmSecond; // 0x01
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BYTE Minute; // 0x02
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BYTE AlarmMinute; // 0x03
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BYTE Hour; // 0x04
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BYTE AlarmHour; // 0x05
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BYTE DayOfWeek; // 0x06
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BYTE Day; // 0x07
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BYTE Month; // 0x08
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BYTE Year; // 0x09
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BYTE StatusRegA; // 0x0a
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BYTE StatusRegB; // 0x0b
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} CMOS_CLOCK, *PCMOS_CLOCK;
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typedef struct
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{
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union
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{
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struct
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{
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CMOS_CLOCK; // 0x00 - 0x0b
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BYTE StatusRegC; // 0x0c
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BYTE StatusRegD; // 0x0d
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BYTE Diagnostics; // 0x0e
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BYTE ShutdownStatus; // 0x0f
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};
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BYTE Regs1[0x10]; // 0x00 - 0x0f
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BYTE Regs [0x40]; // 0x00 - 0x3f
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};
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/*
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* Extended information 0x40 - 0x7f
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*/
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} CMOS_MEMORY, *PCMOS_MEMORY;
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#pragma pack(pop)
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C_ASSERT(sizeof(CMOS_MEMORY) == 0x40);
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/* FUNCTIONS ******************************************************************/
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BOOLEAN IsNmiEnabled(VOID);
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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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VOID CmosInitialize(VOID);
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VOID CmosCleanup(VOID);
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#endif // _CMOS_H_
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/* EOF */
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