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![Aleksandar Andrejevic](/assets/img/avatar_default.png)
Implement CMOS registers 15h, 16h, 17h and 18h. svn path=/branches/ntvdm/; revision=60946
436 lines
11 KiB
C
436 lines
11 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.c
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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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/* INCLUDES *******************************************************************/
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#define NDEBUG
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#include "cmos.h"
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#include "bios.h"
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#include "pic.h"
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/* PRIVATE VARIABLES **********************************************************/
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static HANDLE hCmosRam = INVALID_HANDLE_VALUE;
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static CMOS_MEMORY CmosMemory;
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static BOOLEAN NmiEnabled = TRUE;
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static CMOS_REGISTERS SelectedRegister = CMOS_REG_STATUS_D;
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/* PUBLIC FUNCTIONS ***********************************************************/
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BOOLEAN IsNmiEnabled(VOID)
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{
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return NmiEnabled;
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}
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VOID CmosWriteAddress(BYTE Value)
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{
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/* Update the NMI enabled flag */
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NmiEnabled = !(Value & CMOS_DISABLE_NMI);
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/* Get the register number */
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Value &= ~CMOS_DISABLE_NMI;
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if (Value < CMOS_REG_MAX)
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{
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/* Select the new register */
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SelectedRegister = Value;
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}
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else
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{
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/* Default to Status Register D */
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SelectedRegister = CMOS_REG_STATUS_D;
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}
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}
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BYTE CmosReadData(VOID)
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{
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SYSTEMTIME CurrentTime;
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/* Get the current time */
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GetLocalTime(&CurrentTime);
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switch (SelectedRegister)
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{
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case CMOS_REG_SECONDS:
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return READ_CMOS_DATA(CmosMemory, CurrentTime.wSecond);
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case CMOS_REG_ALARM_SEC:
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return READ_CMOS_DATA(CmosMemory, CmosMemory.AlarmSecond);
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case CMOS_REG_MINUTES:
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return READ_CMOS_DATA(CmosMemory, CurrentTime.wMinute);
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case CMOS_REG_ALARM_MIN:
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return READ_CMOS_DATA(CmosMemory, CmosMemory.AlarmMinute);
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case CMOS_REG_HOURS:
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{
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BOOLEAN Afternoon = FALSE;
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BYTE Value = CurrentTime.wHour;
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if (!(CmosMemory.StatusRegB & CMOS_STB_24HOUR) && (Value >= 12))
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{
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Value -= 12;
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Afternoon = TRUE;
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}
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Value = READ_CMOS_DATA(CmosMemory, Value);
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/* Convert to 12-hour */
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if (Afternoon) Value |= 0x80;
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return Value;
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}
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case CMOS_REG_ALARM_HRS:
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{
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BOOLEAN Afternoon = FALSE;
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BYTE Value = CmosMemory.AlarmHour;
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if (!(CmosMemory.StatusRegB & CMOS_STB_24HOUR) && (Value >= 12))
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{
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Value -= 12;
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Afternoon = TRUE;
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}
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Value = READ_CMOS_DATA(CmosMemory, Value);
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/* Convert to 12-hour */
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if (Afternoon) Value |= 0x80;
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return Value;
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}
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case CMOS_REG_DAY_OF_WEEK:
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/*
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* The CMOS value is 1-based but the
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* GetLocalTime API value is 0-based.
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* Correct it.
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*/
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return READ_CMOS_DATA(CmosMemory, CurrentTime.wDayOfWeek + 1);
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case CMOS_REG_DAY:
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return READ_CMOS_DATA(CmosMemory, CurrentTime.wDay);
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case CMOS_REG_MONTH:
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return READ_CMOS_DATA(CmosMemory, CurrentTime.wMonth);
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case CMOS_REG_YEAR:
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return READ_CMOS_DATA(CmosMemory, CurrentTime.wYear % 100);
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case CMOS_REG_STATUS_C:
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{
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BYTE Value = CmosMemory.StatusRegC;
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/* Clear status register C */
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CmosMemory.StatusRegC = 0x00;
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/* Return the old value */
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return Value;
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}
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case CMOS_REG_BASE_MEMORY_LOW:
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return Bda->MemorySize & 0xFF;
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case CMOS_REG_BASE_MEMORY_HIGH:
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return Bda->MemorySize >> 8;
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case CMOS_REG_EXT_MEMORY_LOW:
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return ((MAX_ADDRESS - 0x100000) / 1024) & 0xFF;
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case CMOS_REG_EXT_MEMORY_HIGH:
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return ((MAX_ADDRESS - 0x100000) / 1024) >> 8;
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case CMOS_REG_STATUS_A:
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case CMOS_REG_STATUS_B:
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case CMOS_REG_STATUS_D:
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case CMOS_REG_DIAGNOSTICS:
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case CMOS_REG_SHUTDOWN_STATUS:
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default:
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{
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// ASSERT(SelectedRegister < CMOS_REG_MAX);
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return CmosMemory.Regs[SelectedRegister];
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}
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}
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/* Return to Status Register D */
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SelectedRegister = CMOS_REG_STATUS_D;
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}
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VOID CmosWriteData(BYTE Value)
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{
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BOOLEAN ChangeTime = FALSE;
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SYSTEMTIME CurrentTime;
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/* Get the current time */
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GetLocalTime(&CurrentTime);
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switch (SelectedRegister)
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{
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case CMOS_REG_SECONDS:
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{
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ChangeTime = TRUE;
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CurrentTime.wSecond = WRITE_CMOS_DATA(CmosMemory, Value);
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break;
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}
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case CMOS_REG_ALARM_SEC:
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{
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CmosMemory.AlarmSecond = WRITE_CMOS_DATA(CmosMemory, Value);
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break;
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}
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case CMOS_REG_MINUTES:
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{
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ChangeTime = TRUE;
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CurrentTime.wMinute = WRITE_CMOS_DATA(CmosMemory, Value);
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break;
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}
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case CMOS_REG_ALARM_MIN:
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{
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CmosMemory.AlarmMinute = WRITE_CMOS_DATA(CmosMemory, Value);
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break;
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}
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case CMOS_REG_HOURS:
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{
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BOOLEAN Afternoon = FALSE;
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ChangeTime = TRUE;
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if (!(CmosMemory.StatusRegB & CMOS_STB_24HOUR) && (Value & 0x80))
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{
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Value &= ~0x80;
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Afternoon = TRUE;
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}
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CurrentTime.wHour = WRITE_CMOS_DATA(CmosMemory, Value);
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/* Convert to 24-hour format */
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if (Afternoon) CurrentTime.wHour += 12;
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break;
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}
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case CMOS_REG_ALARM_HRS:
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{
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BOOLEAN Afternoon = FALSE;
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if (!(CmosMemory.StatusRegB & CMOS_STB_24HOUR) && (Value & 0x80))
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{
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Value &= ~0x80;
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Afternoon = TRUE;
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}
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CmosMemory.AlarmHour = WRITE_CMOS_DATA(CmosMemory, Value);
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/* Convert to 24-hour format */
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if (Afternoon) CmosMemory.AlarmHour += 12;
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break;
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}
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case CMOS_REG_DAY_OF_WEEK:
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{
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ChangeTime = TRUE;
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/*
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* The CMOS value is 1-based but the
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* SetLocalTime API value is 0-based.
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* Correct it.
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*/
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Value -= 1;
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CurrentTime.wDayOfWeek = WRITE_CMOS_DATA(CmosMemory, Value);
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break;
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}
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case CMOS_REG_DAY:
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{
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ChangeTime = TRUE;
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CurrentTime.wDay = WRITE_CMOS_DATA(CmosMemory, Value);
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break;
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}
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case CMOS_REG_MONTH:
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{
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ChangeTime = TRUE;
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CurrentTime.wMonth = WRITE_CMOS_DATA(CmosMemory, Value);
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break;
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}
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case CMOS_REG_YEAR:
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{
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ChangeTime = TRUE;
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/* Clear everything except the century */
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CurrentTime.wYear = (CurrentTime.wYear / 100) * 100;
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CurrentTime.wYear += WRITE_CMOS_DATA(CmosMemory, Value);
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break;
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}
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case CMOS_REG_STATUS_A:
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{
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CmosMemory.StatusRegA = Value & 0x7F; // Bit 7 is read-only
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break;
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}
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case CMOS_REG_STATUS_B:
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{
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CmosMemory.StatusRegB = Value;
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break;
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}
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case CMOS_REG_STATUS_C:
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case CMOS_REG_STATUS_D:
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// Status registers C and D are read-only
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break;
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default:
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{
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CmosMemory.Regs[SelectedRegister] = Value;
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}
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}
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if (ChangeTime) SetLocalTime(&CurrentTime);
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/* Return to Status Register D */
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SelectedRegister = CMOS_REG_STATUS_D;
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}
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DWORD RtcGetTicksPerSecond(VOID)
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{
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BYTE RateSelect = CmosMemory.StatusRegB & 0x0F;
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if (RateSelect == 0)
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{
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/* No periodic interrupt */
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return 0;
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}
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/* 1 and 2 act like 8 and 9 */
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if (RateSelect <= 2) RateSelect += 7;
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return 1 << (16 - RateSelect);
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}
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VOID RtcPeriodicTick(VOID)
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{
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/* Set PF */
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CmosMemory.StatusRegC |= CMOS_STC_PF;
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/* Check if there should be an interrupt on a periodic timer tick */
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if (CmosMemory.StatusRegB & CMOS_STB_INT_PERIODIC)
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{
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CmosMemory.StatusRegC |= CMOS_STC_IRQF;
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/* Interrupt! */
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PicInterruptRequest(RTC_IRQ_NUMBER);
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}
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}
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/* Should be called every second */
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VOID RtcTimeUpdate(VOID)
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{
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SYSTEMTIME CurrentTime;
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/* Get the current time */
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GetLocalTime(&CurrentTime);
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/* Set UF */
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CmosMemory.StatusRegC |= CMOS_STC_UF;
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/* Check if the time matches the alarm time */
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if ((CurrentTime.wHour == CmosMemory.AlarmHour ) &&
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(CurrentTime.wMinute == CmosMemory.AlarmMinute) &&
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(CurrentTime.wSecond == CmosMemory.AlarmSecond))
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{
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/* Set the alarm flag */
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CmosMemory.StatusRegC |= CMOS_STC_AF;
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/* Set IRQF if there should be an interrupt */
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if (CmosMemory.StatusRegB & CMOS_STB_INT_ON_ALARM) CmosMemory.StatusRegC |= CMOS_STC_IRQF;
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}
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/* Check if there should be an interrupt on update */
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if (CmosMemory.StatusRegB & CMOS_STB_INT_ON_UPDATE) CmosMemory.StatusRegC |= CMOS_STC_IRQF;
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if (CmosMemory.StatusRegC & CMOS_STC_IRQF)
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{
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/* Interrupt! */
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PicInterruptRequest(RTC_IRQ_NUMBER);
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}
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}
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BOOLEAN CmosInitialize(VOID)
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{
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DWORD CmosSize = sizeof(CmosMemory);
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/* File must not be opened before */
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ASSERT(hCmosRam == INVALID_HANDLE_VALUE);
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/* Clear the CMOS memory */
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ZeroMemory(&CmosMemory, sizeof(CmosMemory));
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/* Always open (and if needed, create) a RAM file with shared access */
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SetLastError(0); // For debugging purposes
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hCmosRam = CreateFileW(L"cmos.ram",
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GENERIC_READ | GENERIC_WRITE,
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FILE_SHARE_READ | FILE_SHARE_WRITE,
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NULL,
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OPEN_ALWAYS,
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FILE_ATTRIBUTE_NORMAL,
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NULL);
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DPRINT1("CMOS opening %s ; GetLastError() = %u\n", hCmosRam != INVALID_HANDLE_VALUE ? "succeeded" : "failed", GetLastError());
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if (hCmosRam != INVALID_HANDLE_VALUE)
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{
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BOOL Success = FALSE;
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/* Attempt to fill the CMOS memory with the RAM file */
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SetLastError(0); // For debugging purposes
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Success = ReadFile(hCmosRam, &CmosMemory, CmosSize, &CmosSize, NULL);
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if (CmosSize != sizeof(CmosMemory))
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{
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/* Bad CMOS Ram file. Reinitialize the CMOS memory. */
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DPRINT1("Invalid CMOS file, read bytes %u, expected bytes %u\n", CmosSize, sizeof(CmosMemory));
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ZeroMemory(&CmosMemory, sizeof(CmosMemory));
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}
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DPRINT1("CMOS loading %s ; GetLastError() = %u\n", Success ? "succeeded" : "failed", GetLastError());
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SetFilePointer(hCmosRam, 0, NULL, FILE_BEGIN);
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}
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/* Overwrite some registers with default values */
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CmosMemory.StatusRegA = CMOS_DEFAULT_STA;
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CmosMemory.StatusRegB = CMOS_DEFAULT_STB;
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CmosMemory.StatusRegC = 0x00;
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CmosMemory.StatusRegD = CMOS_BATTERY_OK; // Our CMOS battery works perfectly forever.
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CmosMemory.Diagnostics = 0x00; // Diagnostics must not find any errors.
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CmosMemory.ShutdownStatus = 0x00;
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return TRUE;
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}
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VOID CmosCleanup(VOID)
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{
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DWORD CmosSize = sizeof(CmosMemory);
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if (hCmosRam == INVALID_HANDLE_VALUE) return;
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/* Flush the CMOS memory back to the RAM file and close it */
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SetFilePointer(hCmosRam, 0, NULL, FILE_BEGIN);
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WriteFile(hCmosRam, &CmosMemory, CmosSize, &CmosSize, NULL);
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CloseHandle(hCmosRam);
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hCmosRam = INVALID_HANDLE_VALUE;
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}
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/* EOF */
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