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[NTVDM]

Browse source 
Clean up the code and properly separate different modules into different files.


svn path=/branches/ntvdm/; revision=59344
This commit is contained in:
Aleksandar Andrejevic 2013-06-26 22:58:41 +00:00
parent 44f2787b1f
commit 4c4c69fc37
16 changed files with 1229 additions and 999 deletions
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4
subsystems/ntvdm/CMakeLists.txt
View file

@ -5,7 +5,9 @@ list(APPEND SOURCE
bios.c
dos.c
emulator.c
hardware.c
pic.c
timer.c
ps2.c
ntvdm.c
ntvdm.rc)

53
subsystems/ntvdm/bios.c
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@ -6,10 +6,39 @@
* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
*/
#include "ntvdm.h"
/* INCLUDES *******************************************************************/
BYTE CursorRow, CursorCol;
WORD ConsoleWidth, ConsoleHeight;
#include "bios.h"
#include "emulator.h"
#include "pic.h"
#include "timer.h"
/* PRIVATE VARIABLES **********************************************************/
static BYTE CursorRow, CursorCol;
static WORD ConsoleWidth, ConsoleHeight;
/* PRIVATE FUNCTIONS **********************************************************/
static COORD BiosVideoAddressToCoord(ULONG Address)
{
COORD Result = {0, 0};
CONSOLE_SCREEN_BUFFER_INFO ConsoleInfo;
HANDLE ConsoleOutput = GetStdHandle(STD_OUTPUT_HANDLE);
if (!GetConsoleScreenBufferInfo(ConsoleOutput, &ConsoleInfo))
{
ASSERT(FALSE);
return Result;
}
Result.X = ((Address - CONSOLE_VIDEO_MEM_START) >> 1) % ConsoleInfo.dwSize.X;
Result.Y = ((Address - CONSOLE_VIDEO_MEM_START) >> 1) / ConsoleInfo.dwSize.X;
return Result;
}
/* PUBLIC FUNCTIONS ***********************************************************/
BOOLEAN BiosInitialize()
{
@ -83,24 +112,6 @@ BOOLEAN BiosInitialize()
return TRUE;
}
static COORD BiosVideoAddressToCoord(ULONG Address)
{
COORD Result = {0, 0};
CONSOLE_SCREEN_BUFFER_INFO ConsoleInfo;
HANDLE ConsoleOutput = GetStdHandle(STD_OUTPUT_HANDLE);
if (!GetConsoleScreenBufferInfo(ConsoleOutput, &ConsoleInfo))
{
ASSERT(FALSE);
return Result;
}
Result.X = ((Address - CONSOLE_VIDEO_MEM_START) >> 1) % ConsoleInfo.dwSize.X;
Result.Y = ((Address - CONSOLE_VIDEO_MEM_START) >> 1) / ConsoleInfo.dwSize.X;
return Result;
}
VOID BiosUpdateConsole(ULONG StartAddress, ULONG EndAddress)
{
ULONG i;

36
subsystems/ntvdm/bios.h Normal file
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@ -0,0 +1,36 @@
/*
* COPYRIGHT: GPL - See COPYING in the top level directory
* PROJECT: ReactOS Virtual DOS Machine
* FILE: bios.h
* PURPOSE: VDM BIOS (header file)
* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
*/
#ifndef _BIOS_H_
#define _BIOS_H_
/* INCLUDES *******************************************************************/
#include "ntvdm.h"
/* DEFINES ********************************************************************/
#define CONSOLE_VIDEO_MEM_START 0xB8000
#define CONSOLE_VIDEO_MEM_END 0xBFFFF
#define ROM_AREA_START 0xC0000
#define ROM_AREA_END 0xFFFFF
#define BIOS_PIC_MASTER_INT 0x08
#define BIOS_PIC_SLAVE_INT 0x70
#define BIOS_SEGMENT 0xF000
#define VIDEO_BIOS_INTERRUPT 0x10
#define CONSOLE_FONT_HEIGHT 8
/* FUNCTIONS ******************************************************************/
BOOLEAN BiosInitialize();
VOID BiosUpdateConsole(ULONG StartAddress, ULONG EndAddress);
VOID BiosUpdateVideoMemory(ULONG StartAddress, ULONG EndAddress);
VOID BiosVideoService();
VOID BiosHandleIrq(BYTE IrqNumber);
#endif

15
subsystems/ntvdm/dos.c
View file

@ -6,10 +6,17 @@
* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
*/
#include "ntvdm.h"
/* INCLUDES *******************************************************************/
WORD CurrentPsp = SYSTEM_PSP, LastError = 0;
DWORD DiskTransferArea;
#include "dos.h"
#include "emulator.h"
/* PRIVATE VARIABLES **********************************************************/
static WORD CurrentPsp = SYSTEM_PSP;
static DWORD DiskTransferArea;
/* PRIVATE FUNCTIONS **********************************************************/
static VOID DosCombineFreeBlocks(WORD StartBlock)
{
@ -78,6 +85,8 @@ static WORD DosCopyEnvironmentBlock(WORD SourceSegment)
return DestSegment;
}
/* PUBLIC FUNCTIONS ***********************************************************/
WORD DosAllocateMemory(WORD Size, WORD *MaxAvailable)
{
WORD Result = 0, Segment = FIRST_MCB_SEGMENT, MaxSize = 0;

133
subsystems/ntvdm/dos.h Normal file
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@ -0,0 +1,133 @@
/*
* COPYRIGHT: GPL - See COPYING in the top level directory
* PROJECT: ReactOS Virtual DOS Machine
* FILE: dos.h
* PURPOSE: VDM DOS Kernel (header file)
* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
*/
#ifndef _DOS_H_
#define _DOS_H_
/* INCLUDES *******************************************************************/
#include "ntvdm.h"
/* DEFINES ********************************************************************/
#define DOS_VERSION 0x0600
#define DOS_CONFIG_PATH L"%SystemRoot%\\system32\\CONFIG.NT"
#define DOS_COMMAND_INTERPRETER L"%SystemRoot%\\system32\\COMMAND.COM /k %SystemRoot%\\system32\\AUTOEXEC.NT"
#define FIRST_MCB_SEGMENT 0x1000
#define USER_MEMORY_SIZE 0x8FFFF
#define SYSTEM_PSP 0x08
#define SYSTEM_ENV_BLOCK 0x800
#define SEGMENT_TO_MCB(seg) ((PDOS_MCB)((ULONG_PTR)BaseAddress + TO_LINEAR((seg), 0)))
#define SEGMENT_TO_PSP(seg) ((PDOS_PSP)((ULONG_PTR)BaseAddress + TO_LINEAR((seg), 0)))
#pragma pack(push, 1)
typedef struct _DOS_MCB
{
CHAR BlockType;
WORD OwnerPsp;
WORD Size;
BYTE Unused[3];
CHAR Name[8];
} DOS_MCB, *PDOS_MCB;
typedef struct _DOS_FCB
{
BYTE DriveNumber;
CHAR FileName[8];
CHAR FileExt[3];
WORD BlockNumber;
WORD RecordSize;
DWORD FileSize;
WORD LastWriteDate;
WORD LastWriteTime;
BYTE Reserved[8];
BYTE BlockRecord;
BYTE RecordNumber[3];
} DOS_FCB, *PDOS_FCB;
typedef struct _DOS_PSP
{
BYTE Exit[2];
WORD MemSize;
BYTE Reserved0[6];
DWORD TerminateAddress;
DWORD BreakAddress;
DWORD CriticalAddress;
WORD ParentPsp;
BYTE HandleTable[20];
WORD EnvBlock;
DWORD LastStack;
WORD HandleTableSize;
DWORD HandleTablePtr;
DWORD PreviousPsp;
DWORD Reserved1;
WORD DosVersion;
BYTE Reserved2[14];
BYTE FarCall[3];
BYTE Reserved3[9];
DOS_FCB Fcb;
BYTE CommandLineSize;
CHAR CommandLine[127];
} DOS_PSP, *PDOS_PSP;
typedef struct _DOS_SFT_ENTRY
{
WORD ReferenceCount;
WORD Mode;
BYTE Attribute;
WORD DeviceInfo;
DWORD DriveParamBlock;
WORD FirstCluster;
WORD FileTime;
WORD FileDate;
DWORD FileSize;
DWORD CurrentOffset;
WORD LastClusterAccessed;
DWORD DirEntSector;
BYTE DirEntryIndex;
CHAR FileName[11];
BYTE Reserved0[6];
WORD OwnerPsp;
BYTE Reserved1[8];
} DOS_SFT_ENTRY, *PDOS_SFT_ENTRY;
typedef struct _DOS_SFT
{
DWORD NextTablePtr;
WORD FileCount;
DOS_SFT_ENTRY Entry[ANYSIZE_ARRAY];
} DOS_SFT, *PDOS_SFT;
typedef struct _DOS_INPUT_BUFFER
{
BYTE MaxLength, Length;
CHAR Buffer[ANYSIZE_ARRAY];
} DOS_INPUT_BUFFER, *PDOS_INPUT_BUFFER;
#pragma pack(pop)
/* FUNCTIONS ******************************************************************/
WORD DosAllocateMemory(WORD Size, WORD *MaxAvailable);
BOOLEAN DosResizeMemory(WORD BlockData, WORD NewSize, WORD *MaxAvailable);
BOOLEAN DosFreeMemory(WORD BlockData);
VOID DosInitializePsp(WORD PspSegment, LPCSTR CommandLine, WORD ProgramSize, WORD Environment);
BOOLEAN DosCreateProcess(LPCSTR CommandLine, WORD EnvBlock);
VOID DosTerminateProcess(WORD Psp, BYTE ReturnCode);
CHAR DosReadCharacter();
VOID DosPrintCharacter(CHAR Character);
VOID DosInt20h(WORD CodeSegment);
VOID DosInt21h(WORD CodeSegment);
VOID DosBreakInterrupt();
BOOLEAN DosInitialize();
#endif
/* EOF */

17
subsystems/ntvdm/emulator.c
View file

@ -8,14 +8,21 @@
/* INCLUDES *******************************************************************/
#include "ntvdm.h"
#include <softx86/softx86.h>
#include <softx86/softx87.h>
#include "emulator.h"
#include "bios.h"
#include "dos.h"
#include "pic.h"
#include "ps2.h"
#include "timer.h"
softx86_ctx EmulatorContext;
softx87_ctx FpuEmulatorContext;
/* PRIVATE VARIABLES **********************************************************/
static softx86_ctx EmulatorContext;
static softx87_ctx FpuEmulatorContext;
static BOOLEAN A20Line = FALSE;
/* PRIVATE FUNCTIONS **********************************************************/
static VOID EmulatorReadMemory(PVOID Context, UINT Address, LPBYTE Buffer, INT Size)
{
/* If the A20 line is disabled, mask bit 20 */

85
subsystems/ntvdm/emulator.h Normal file
View file

@ -0,0 +1,85 @@
/*
* COPYRIGHT: GPL - See COPYING in the top level directory
* PROJECT: ReactOS Virtual DOS Machine
* FILE: emulator.h
* PURPOSE: Minimal x86 machine emulator for the VDM (header file)
* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
*/
#ifndef _EMULATOR_H_
#define _EMULATOR_H_
/* INCLUDES *******************************************************************/
#include "ntvdm.h"
#include <softx86/softx86.h>
#include <softx86/softx87.h>
/* DEFINES ********************************************************************/
#define EMULATOR_FLAG_CF (1 << 0)
#define EMULATOR_FLAG_PF (1 << 2)
#define EMULATOR_FLAG_AF (1 << 4)
#define EMULATOR_FLAG_ZF (1 << 6)
#define EMULATOR_FLAG_SF (1 << 7)
#define EMULATOR_FLAG_TF (1 << 8)
#define EMULATOR_FLAG_IF (1 << 9)
#define EMULATOR_FLAG_DF (1 << 10)
#define EMULATOR_FLAG_OF (1 << 11)
#define EMULATOR_FLAG_NT (1 << 14)
#define EMULATOR_FLAG_RF (1 << 16)
#define EMULATOR_FLAG_VM (1 << 17)
#define EMULATOR_FLAG_AC (1 << 18)
#define EMULATOR_FLAG_VIF (1 << 19)
#define EMULATOR_FLAG_VIP (1 << 20)
#define EMULATOR_FLAG_ID (1 << 21)
#define SPECIAL_INT_NUM 0xFF
enum
{
EMULATOR_EXCEPTION_DIVISION_BY_ZERO,
EMULATOR_EXCEPTION_DEBUG,
EMULATOR_EXCEPTION_NMI,
EMULATOR_EXCEPTION_BREAKPOINT,
EMULATOR_EXCEPTION_OVERFLOW,
EMULATOR_EXCEPTION_BOUND,
EMULATOR_EXCEPTION_INVALID_OPCODE,
EMULATOR_EXCEPTION_NO_FPU
};
typedef enum
{
EMULATOR_REG_AX,
EMULATOR_REG_CX,
EMULATOR_REG_DX,
EMULATOR_REG_BX,
EMULATOR_REG_SI,
EMULATOR_REG_DI,
EMULATOR_REG_SP,
EMULATOR_REG_BP,
EMULATOR_REG_ES,
EMULATOR_REG_CS,
EMULATOR_REG_SS,
EMULATOR_REG_DS,
} EMULATOR_REGISTER;
/* FUNCTIONS ******************************************************************/
BOOLEAN EmulatorInitialize();
VOID EmulatorSetStack(WORD Segment, WORD Offset);
VOID EmulatorExecute(WORD Segment, WORD Offset);
VOID EmulatorInterrupt(BYTE Number);
VOID EmulatorExternalInterrupt(BYTE Number);
ULONG EmulatorGetRegister(ULONG Register);
VOID EmulatorSetRegister(ULONG Register, ULONG Value);
BOOLEAN EmulatorGetFlag(ULONG Flag);
VOID EmulatorSetFlag(ULONG Flag);
VOID EmulatorClearFlag(ULONG Flag);
VOID EmulatorStep();
VOID EmulatorCleanup();
VOID EmulatorSetA20(BOOLEAN Enabled);
#endif
/* EOF */

742
subsystems/ntvdm/hardware.c
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@ -1,742 +0,0 @@
/*
* COPYRIGHT: GPL - See COPYING in the top level directory
* PROJECT: ReactOS Virtual DOS Machine
* FILE: hardware.c
* PURPOSE: Minimal hardware emulation
* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
*/
/* INCLUDES *******************************************************************/
#include "ntvdm.h"
typedef struct _PIC
{
BOOLEAN Initialization;
BYTE MaskRegister;
BYTE InServiceRegister;
BYTE IntOffset;
BYTE ConfigRegister;
BYTE CascadeRegister;
BOOLEAN CascadeRegisterSet;
BOOLEAN AutoEoi;
BOOLEAN Slave;
BOOLEAN ReadIsr;
} PIC, *PPIC;
enum
{
PIT_MODE_INT_ON_TERMINAL_COUNT,
PIT_MODE_HARDWARE_ONE_SHOT,
PIT_MODE_RATE_GENERATOR,
PIT_MODE_SQUARE_WAVE,
PIT_MODE_SOFTWARE_STROBE,
PIT_MODE_HARDWARE_STROBE
};
typedef struct _PIT_CHANNEL
{
WORD ReloadValue;
WORD CurrentValue;
WORD LatchedValue;
INT Mode;
BOOLEAN Pulsed;
BOOLEAN LatchSet;
BOOLEAN InputFlipFlop;
BOOLEAN OutputFlipFlop;
BYTE AccessMode;
} PIT_CHANNEL, *PPIT_CHANNEL;
static PIC MasterPic, SlavePic;
static PIT_CHANNEL PitChannels[PIT_CHANNELS];
static BYTE KeyboardQueue[KEYBOARD_BUFFER_SIZE];
static BOOLEAN KeyboardQueueEmpty = TRUE;
static UINT KeyboardQueueStart = 0;
static UINT KeyboardQueueEnd = 0;
static BYTE KeyboardResponse = 0;
static BOOLEAN KeyboardReadResponse = FALSE, KeyboardWriteResponse = FALSE;
static BYTE KeyboardConfig = PS2_DEFAULT_CONFIG;
static BOOLEAN KeyboardQueuePush(BYTE ScanCode)
{
/* Check if the keyboard queue is full */
if (!KeyboardQueueEmpty && (KeyboardQueueStart == KeyboardQueueEnd))
{
return FALSE;
}
/* Insert the value in the queue */
KeyboardQueue[KeyboardQueueEnd] = ScanCode;
KeyboardQueueEnd++;
KeyboardQueueEnd %= KEYBOARD_BUFFER_SIZE;
/* Since we inserted a value, it's not empty anymore */
KeyboardQueueEmpty = FALSE;
return TRUE;
}
static BOOLEAN KeyboardQueuePop(BYTE *ScanCode)
{
/* Make sure the keyboard queue is not empty */
if (KeyboardQueueEmpty) return FALSE;
/* Get the scan code */
*ScanCode = KeyboardQueue[KeyboardQueueStart];
/* Remove the value from the queue */
KeyboardQueueStart++;
KeyboardQueueStart %= KEYBOARD_BUFFER_SIZE;
/* Check if the queue is now empty */
if (KeyboardQueueStart == KeyboardQueueEnd)
{
KeyboardQueueEmpty = TRUE;
}
return TRUE;
}
/* PUBLIC FUNCTIONS ***********************************************************/
BYTE PicReadCommand(BYTE Port)
{
PPIC Pic;
/* Which PIC are we accessing? */
if (Port == PIC_MASTER_CMD) Pic = &MasterPic;
else Pic = &SlavePic;
if (Pic->ReadIsr)
{
/* Read the in-service register */
Pic->ReadIsr = FALSE;
return Pic->InServiceRegister;
}
else
{
/* The IRR is always 0, as the emulated CPU receives the interrupt instantly */
return 0;
}
}
VOID PicWriteCommand(BYTE Port, BYTE Value)
{
PPIC Pic;
/* Which PIC are we accessing? */
if (Port == PIC_MASTER_CMD) Pic = &MasterPic;
else Pic = &SlavePic;
if (Value & PIC_ICW1)
{
/* Start initialization */
Pic->Initialization = TRUE;
Pic->IntOffset = 0xFF;
Pic->CascadeRegisterSet = FALSE;
Pic->ConfigRegister = Value;
return;
}
if (Value & PIC_OCW3)
{
/* This is an OCR3 */
if (Value == PIC_OCW3_READ_ISR)
{
/* Return the ISR on next read from command port */
Pic->ReadIsr = TRUE;
}
return;
}
/* This is an OCW2 */
if (Value & PIC_OCW2_EOI)
{
if (Value & PIC_OCW2_SL)
{
/* If the SL bit is set, clear a specific IRQ */
Pic->InServiceRegister &= ~(1 << (Value & PIC_OCW2_NUM_MASK));
}
else
{
/* Otherwise, clear all of them */
Pic->InServiceRegister = 0;
}
}
}
BYTE PicReadData(BYTE Port)
{
/* Read the mask register */
if (Port == PIC_MASTER_DATA) return MasterPic.MaskRegister;
else return SlavePic.MaskRegister;
}
VOID PicWriteData(BYTE Port, BYTE Value)
{
PPIC Pic;
/* Which PIC are we accessing? */
if (Port == PIC_MASTER_DATA) Pic = &MasterPic;
else Pic = &SlavePic;
/* Is the PIC ready? */
if (!Pic->Initialization)
{
/* Yes, this is an OCW1 */
Pic->MaskRegister = Value;
return;
}
/* Has the interrupt offset been set? */
if (Pic->IntOffset == 0xFF)
{
/* This is an ICW2, set the offset (last three bits always zero) */
Pic->IntOffset = Value & 0xF8;
/* Check if we are in single mode and don't need an ICW4 */
if ((Pic->ConfigRegister & PIC_ICW1_SINGLE)
&& !(Pic->ConfigRegister & PIC_ICW1_ICW4))
{
/* Yes, done initializing */
Pic->Initialization = FALSE;
}
return;
}
/* Check if we are in cascade mode and the cascade register was not set */
if (!(Pic->ConfigRegister & PIC_ICW1_SINGLE) && !Pic->CascadeRegisterSet)
{
/* This is an ICW3 */
Pic->CascadeRegister = Value;
Pic->CascadeRegisterSet = TRUE;
/* Check if we need an ICW4 */
if (!(Pic->ConfigRegister & PIC_ICW1_ICW4))
{
/* No, done initializing */
Pic->Initialization = FALSE;
}
return;
}
/* This must be an ICW4, we will ignore the 8086 bit (assume always set) */
if (Value & PIC_ICW4_AEOI)
{
/* Use automatic end-of-interrupt */
Pic->AutoEoi = TRUE;
}
/* Done initializing */
Pic->Initialization = FALSE;
}
VOID PicInterruptRequest(BYTE Number)
{
BYTE i;
if (Number >= 0 && Number < 8)
{
/* Check if any of the higher-priorirty interrupts are busy */
for (i = 0; i <= Number ; i++)
{
if (MasterPic.InServiceRegister & (1 << Number)) return;
}
/* Check if the interrupt is masked */
if (MasterPic.MaskRegister & (1 << Number)) return;
/* Set the appropriate bit in the ISR and interrupt the CPU */
if (!MasterPic.AutoEoi) MasterPic.InServiceRegister |= 1 << Number;
EmulatorExternalInterrupt(MasterPic.IntOffset + Number);
}
else if (Number >= 8 && Number < 16)
{
Number -= 8;
/*
* The slave PIC is connected to IRQ 2, always! If the master PIC
* was misconfigured, don't do anything.
*/
if (!(MasterPic.CascadeRegister & (1 << 2))
|| SlavePic.CascadeRegister != 2)
{
return;
}
/* Check if any of the higher-priorirty interrupts are busy */
if (MasterPic.InServiceRegister != 0) return;
for (i = 0; i <= Number ; i++)
{
if (SlavePic.InServiceRegister & (1 << Number)) return;
}
/* Check if the interrupt is masked */
if (SlavePic.MaskRegister & (1 << Number)) return;
/* Set the IRQ 2 bit in the master ISR */
if (!MasterPic.AutoEoi) MasterPic.InServiceRegister |= 1 << 2;
/* Set the appropriate bit in the ISR and interrupt the CPU */
if (!SlavePic.AutoEoi) SlavePic.InServiceRegister |= 1 << Number;
EmulatorExternalInterrupt(SlavePic.IntOffset + Number);
}
}
VOID PitWriteCommand(BYTE Value)
{
BYTE Channel = Value >> 6;
BYTE Mode = (Value >> 1) & 0x07;
/* Check if this is a counter latch command */
if (((Value >> 4) & 3) == 0)
{
PitChannels[Channel].LatchSet = TRUE;
PitChannels[Channel].LatchedValue = PitChannels[Channel].CurrentValue;
return;
}
/* Set the access mode and reset flip-flops */
PitChannels[Channel].AccessMode = (Value >> 4) & 3;
PitChannels[Channel].Pulsed = FALSE;
PitChannels[Channel].LatchSet = FALSE;
PitChannels[Channel].InputFlipFlop = FALSE;
PitChannels[Channel].OutputFlipFlop = FALSE;
switch (Mode)
{
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
{
PitChannels[Channel].Mode = Mode;
break;
}
case 6:
{
PitChannels[Channel].Mode = PIT_MODE_RATE_GENERATOR;
break;
}
case 7:
{
PitChannels[Channel].Mode = PIT_MODE_SQUARE_WAVE;
break;
}
}
}
BYTE PitReadData(BYTE Channel)
{
WORD CurrentValue = PitChannels[Channel].CurrentValue;
BYTE AccessMode = PitChannels[Channel].AccessMode;
/* Check if the value was latched */
if (PitChannels[Channel].LatchSet)
{
CurrentValue = PitChannels[Channel].LatchedValue;
if (AccessMode == 1 || AccessMode == 2)
{
/* The latched value was read as one byte */
PitChannels[Channel].LatchSet = FALSE;
}
}
/* Use the flip-flop for access mode 3 */
if (AccessMode == 3)
{
AccessMode = PitChannels[Channel].InputFlipFlop ? 1 : 2;
PitChannels[Channel].InputFlipFlop = !PitChannels[Channel].InputFlipFlop;
/* Check if this was the last read for the latched value */
if (!PitChannels[Channel].InputFlipFlop)
{
/* Yes, the latch value was read as two bytes */
PitChannels[Channel].LatchSet = FALSE;
}
}
switch (AccessMode)
{
case 1:
{
/* Low byte */
return CurrentValue & 0x00FF;
}
case 2:
{
/* High byte */
return CurrentValue >> 8;
}
}
/* Shouldn't get here */
return 0;
}
VOID PitWriteData(BYTE Channel, BYTE Value)
{
BYTE AccessMode = PitChannels[Channel].AccessMode;
/* Use the flip-flop for access mode 3 */
if (PitChannels[Channel].AccessMode == 3)
{
AccessMode = PitChannels[Channel].InputFlipFlop ? 1 : 2;
PitChannels[Channel].InputFlipFlop = !PitChannels[Channel].InputFlipFlop;
}
switch (AccessMode)
{
case 1:
{
/* Low byte */
PitChannels[Channel].ReloadValue &= 0xFF00;
PitChannels[Channel].ReloadValue |= Value;
break;
}
case 2:
{
/* High byte */
PitChannels[Channel].ReloadValue &= 0x00FF;
PitChannels[Channel].ReloadValue |= Value << 8;
}
}
}
VOID PitDecrementCount()
{
INT i;
for (i = 0; i < PIT_CHANNELS; i++)
{
switch (PitChannels[i].Mode)
{
case PIT_MODE_INT_ON_TERMINAL_COUNT:
{
/* Decrement the value */
PitChannels[i].CurrentValue--;
/* Did it fall to the terminal count? */
if (PitChannels[i].CurrentValue == 0 && !PitChannels[i].Pulsed)
{
/* Yes, raise the output line */
if (i == 0) PicInterruptRequest(0);
PitChannels[i].Pulsed = TRUE;
}
break;
}
case PIT_MODE_RATE_GENERATOR:
{
/* Decrement the value */
PitChannels[i].CurrentValue--;
/* Did it fall to zero? */
if (PitChannels[i].CurrentValue != 0) break;
/* Yes, raise the output line and reload */
if (i == 0) PicInterruptRequest(0);
PitChannels[i].CurrentValue = PitChannels[i].ReloadValue;
break;
}
case PIT_MODE_SQUARE_WAVE:
{
/* Decrement the value by 2 */
PitChannels[i].CurrentValue -= 2;
/* Did it fall to zero? */
if (PitChannels[i].CurrentValue != 0) break;
/* Yes, toggle the flip-flop */
PitChannels[i].OutputFlipFlop = !PitChannels[i].OutputFlipFlop;
/* Did this create a rising edge in the signal? */
if (PitChannels[i].OutputFlipFlop)
{
/* Yes, IRQ 0 if this is channel 0 */
if (i == 0) PicInterruptRequest(0);
}
/* Reload the value, but make sure it's even */
if (PitChannels[i].ReloadValue % 2)
{
/* It's odd, reduce it by 1 */
PitChannels[i].CurrentValue = PitChannels[i].ReloadValue - 1;
}
else
{
/* It was even */
PitChannels[i].CurrentValue = PitChannels[i].ReloadValue;
}
break;
}
case PIT_MODE_SOFTWARE_STROBE:
{
// TODO: NOT IMPLEMENTED
break;
}
case PIT_MODE_HARDWARE_ONE_SHOT:
case PIT_MODE_HARDWARE_STROBE:
{
/* These modes do not work on x86 PCs */
break;
}
}
}
}
BYTE KeyboardReadStatus()
{
BYTE Status = 0;
/* Set the first bit if the data can be read */
if (KeyboardReadResponse || !KeyboardQueueEmpty) Status |= 1 << 0;
/* Always set bit 2 */
Status |= 1 << 2;
/* Set bit 3 if the next byte goes to the controller */
if (KeyboardWriteResponse) Status |= 1 << 3;
return Status;
}
VOID KeyboardWriteCommand(BYTE Command)
{
switch (Command)
{
/* Read configuration byte */
case 0x20:
{
KeyboardResponse = KeyboardConfig;
KeyboardReadResponse = TRUE;
break;
}
/* Write configuration byte */
case 0x60:
/* Write controller output port */
case 0xD1:
/* Write keyboard output buffer */
case 0xD2:
/* Write mouse output buffer */
case 0xD3:
/* Write mouse input buffer */
case 0xD4:
{
/* These commands require a response */
KeyboardResponse = Command;
KeyboardWriteResponse = TRUE;
break;
}
/* Disable mouse */
case 0xA7:
{
// TODO: Mouse support
break;
}
/* Enable mouse */
case 0xA8:
{
// TODO: Mouse support
break;
}
/* Test mouse port */
case 0xA9:
{
KeyboardResponse = 0;
KeyboardReadResponse = TRUE;
break;
}
/* Test PS/2 controller */
case 0xAA:
{
KeyboardResponse = 0x55;
KeyboardReadResponse = TRUE;
break;
}
/* Disable keyboard */
case 0xAD:
{
// TODO: Not implemented
break;
}
/* Enable keyboard */
case 0xAE:
{
// TODO: Not implemented
break;
}
/* Read controller output port */
case 0xD0:
{
// TODO: Not implemented
break;
}
/* CPU Reset */
case 0xF0:
case 0xF2:
case 0xF4:
case 0xF6:
case 0xF8:
case 0xFA:
case 0xFC:
case 0xFE:
{
/* Stop the simulation */
VdmRunning = FALSE;
break;
}
}
}
BYTE KeyboardReadData()
{
BYTE Value = 0;
/* If there was a response byte from the controller, return it */
if (KeyboardReadResponse)
{
KeyboardReadResponse = FALSE;
return KeyboardResponse;
}
/* Otherwise, read the data from the queue */
KeyboardQueuePop(&Value);
return Value;
}
VOID KeyboardWriteData(BYTE Data)
{
/* Check if the controller is waiting for a response */
if (KeyboardWriteResponse)
{
KeyboardWriteResponse = FALSE;
/* Check which command it was */
switch (KeyboardResponse)
{
/* Write configuration byte */
case 0x60:
{
KeyboardConfig = Data;
break;
}
/* Write controller output */
case 0xD1:
{
/* Check if bit 0 is unset */
if (!(Data & (1 << 0)))
{
/* CPU disabled - end simulation */
VdmRunning = FALSE;
}
/* Update the A20 line setting */
EmulatorSetA20(Data & (1 << 1));
break;
}
case 0xD2:
{
/* Push the data byte to the keyboard queue */
KeyboardQueuePush(Data);
break;
}
case 0xD3:
{
// TODO: Mouse support
break;
}
case 0xD4:
{
// TODO: Mouse support
break;
}
}
return;
}
// TODO: Implement PS/2 device commands
}
VOID CheckForInputEvents()
{
PINPUT_RECORD Buffer;
HANDLE ConsoleInput = GetStdHandle(STD_INPUT_HANDLE);
DWORD i, j, Count, TotalEvents;
BYTE ScanCode;
/* Get the number of input events */
if (!GetNumberOfConsoleInputEvents(ConsoleInput, &Count)) return;
if (Count == 0) return;
/* Allocate the buffer */
Buffer = (PINPUT_RECORD)HeapAlloc(GetProcessHeap(), 0, Count * sizeof(INPUT_RECORD));
if (Buffer == NULL) return;
/* Peek the input events */
if (!ReadConsoleInput(ConsoleInput, Buffer, Count, &TotalEvents)) goto Cleanup;
for (i = 0; i < TotalEvents; i++)
{
/* Check if this is a key event */
if (Buffer[i].EventType != KEY_EVENT) continue;
/* Get the scan code */
ScanCode = Buffer[i].Event.KeyEvent.wVirtualScanCode;
/* If this is a key release, set the highest bit in the scan code */
if (!Buffer[i].Event.KeyEvent.bKeyDown) ScanCode |= 0x80;
/* Push the scan code onto the keyboard queue */
for (j = 0; j < Buffer[i].Event.KeyEvent.wRepeatCount; j++)
{
KeyboardQueuePush(ScanCode);
}
/* Yes, IRQ 1 */
PicInterruptRequest(1);
/* Stop the loop */
break;
}
Cleanup:
HeapFree(GetProcessHeap(), 0, Buffer);
}

12
subsystems/ntvdm/ntvdm.c
View file

@ -6,7 +6,17 @@
* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
*/
/* INCLUDES *******************************************************************/
#include "ntvdm.h"
#include "emulator.h"
#include "bios.h"
#include "dos.h"
#include "timer.h"
#include "pic.h"
#include "ps2.h"
/* PUBLIC VARIABLES ***********************************************************/
BOOLEAN VdmRunning = TRUE;
LPVOID BaseAddress = NULL;
@ -22,6 +32,8 @@ LPCWSTR ExceptionName[] =
L"FPU Not Available"
};
/* PUBLIC FUNCTIONS ***********************************************************/
VOID DisplayMessage(LPCWSTR Format, ...)
{
WCHAR Buffer[256];

232
subsystems/ntvdm/ntvdm.h
View file

@ -6,6 +6,9 @@
* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
*/
#ifndef _NTVDM_H_
#define _NTVDM_H_
/* INCLUDES *******************************************************************/
#include <windows.h>
@ -23,193 +26,8 @@
#define MAX_SEGMENT 0xFFFF
#define MAX_OFFSET 0xFFFF
#define MAX_ADDRESS TO_LINEAR(MAX_SEGMENT, MAX_OFFSET)
#define ROM_AREA_START 0xC0000
#define ROM_AREA_END 0xFFFFF
#define BIOS_PIC_MASTER_INT 0x08
#define BIOS_PIC_SLAVE_INT 0x70
#define BIOS_SEGMENT 0xF000
#define VIDEO_BIOS_INTERRUPT 0x10
#define SPECIAL_INT_NUM 0xFF
#define SEGMENT_TO_MCB(seg) ((PDOS_MCB)((ULONG_PTR)BaseAddress + TO_LINEAR((seg), 0)))
#define SEGMENT_TO_PSP(seg) ((PDOS_PSP)((ULONG_PTR)BaseAddress + TO_LINEAR((seg), 0)))
#define STEPS_PER_CYCLE 256
/* DOS constants */
#define DOS_VERSION 0x0600
#define DOS_CONFIG_PATH L"%SystemRoot%\\system32\\CONFIG.NT"
#define DOS_COMMAND_INTERPRETER L"%SystemRoot%\\system32\\COMMAND.COM /k %SystemRoot%\\system32\\AUTOEXEC.NT"
#define FIRST_MCB_SEGMENT 0x1000
#define USER_MEMORY_SIZE 0x8FFFF
#define SYSTEM_PSP 0x08
#define SYSTEM_ENV_BLOCK 0x800
/* System console constants */
#define CONSOLE_FONT_HEIGHT 8
#define CONSOLE_VIDEO_MEM_START 0xB8000
#define CONSOLE_VIDEO_MEM_END 0xBFFFF
/* Programmable interval timer (PIT) */
#define PIT_CHANNELS 3
#define PIT_BASE_FREQUENCY 1193182LL
#define PIT_DATA_PORT(x) (0x40 + (x))
#define PIT_COMMAND_PORT 0x43
/* Programmable interrupt controller (PIC) */
#define PIC_MASTER_CMD 0x20
#define PIC_MASTER_DATA 0x21
#define PIC_SLAVE_CMD 0xA0
#define PIC_SLAVE_DATA 0xA1
#define PIC_ICW1 0x10
#define PIC_ICW1_ICW4 (1 << 0)
#define PIC_ICW1_SINGLE (1 << 1)
#define PIC_ICW4_8086 (1 << 0)
#define PIC_ICW4_AEOI (1 << 1)
#define PIC_OCW2_NUM_MASK 0x07
#define PIC_OCW2_EOI (1 << 5)
#define PIC_OCW2_SL (1 << 6)
#define PIC_OCW3 (1 << 3)
#define PIC_OCW3_READ_ISR 0x0B
/* 8042 PS/2 controller */
#define KEYBOARD_BUFFER_SIZE 32
#define PS2_DATA_PORT 0x60
#define PS2_CONTROL_PORT 0x64
#define PS2_DEFAULT_CONFIG 0x05
#define KEYBOARD_ACK 0xFA
#define KEYBOARD_RESEND 0xFE
#define EMULATOR_FLAG_CF (1 << 0)
#define EMULATOR_FLAG_PF (1 << 2)
#define EMULATOR_FLAG_AF (1 << 4)
#define EMULATOR_FLAG_ZF (1 << 6)
#define EMULATOR_FLAG_SF (1 << 7)
#define EMULATOR_FLAG_TF (1 << 8)
#define EMULATOR_FLAG_IF (1 << 9)
#define EMULATOR_FLAG_DF (1 << 10)
#define EMULATOR_FLAG_OF (1 << 11)
#define EMULATOR_FLAG_NT (1 << 14)
#define EMULATOR_FLAG_RF (1 << 16)
#define EMULATOR_FLAG_VM (1 << 17)
#define EMULATOR_FLAG_AC (1 << 18)
#define EMULATOR_FLAG_VIF (1 << 19)
#define EMULATOR_FLAG_VIP (1 << 20)
#define EMULATOR_FLAG_ID (1 << 21)
enum
{
EMULATOR_EXCEPTION_DIVISION_BY_ZERO,
EMULATOR_EXCEPTION_DEBUG,
EMULATOR_EXCEPTION_NMI,
EMULATOR_EXCEPTION_BREAKPOINT,
EMULATOR_EXCEPTION_OVERFLOW,
EMULATOR_EXCEPTION_BOUND,
EMULATOR_EXCEPTION_INVALID_OPCODE,
EMULATOR_EXCEPTION_NO_FPU
};
typedef enum
{
EMULATOR_REG_AX,
EMULATOR_REG_CX,
EMULATOR_REG_DX,
EMULATOR_REG_BX,
EMULATOR_REG_SI,
EMULATOR_REG_DI,
EMULATOR_REG_SP,
EMULATOR_REG_BP,
EMULATOR_REG_ES,
EMULATOR_REG_CS,
EMULATOR_REG_SS,
EMULATOR_REG_DS,
} EMULATOR_REGISTER;
#pragma pack(push, 1)
typedef struct _DOS_MCB
{
CHAR BlockType;
WORD OwnerPsp;
WORD Size;
BYTE Unused[3];
CHAR Name[8];
} DOS_MCB, *PDOS_MCB;
typedef struct _DOS_FCB
{
BYTE DriveNumber;
CHAR FileName[8];
CHAR FileExt[3];
WORD BlockNumber;
WORD RecordSize;
DWORD FileSize;
WORD LastWriteDate;
WORD LastWriteTime;
BYTE Reserved[8];
BYTE BlockRecord;
BYTE RecordNumber[3];
} DOS_FCB, *PDOS_FCB;
typedef struct _DOS_PSP
{
BYTE Exit[2];
WORD MemSize;
BYTE Reserved0[6];
DWORD TerminateAddress;
DWORD BreakAddress;
DWORD CriticalAddress;
WORD ParentPsp;
BYTE HandleTable[20];
WORD EnvBlock;
DWORD LastStack;
WORD HandleTableSize;
DWORD HandleTablePtr;
DWORD PreviousPsp;
DWORD Reserved1;
WORD DosVersion;
BYTE Reserved2[14];
BYTE FarCall[3];
BYTE Reserved3[9];
DOS_FCB Fcb;
BYTE CommandLineSize;
CHAR CommandLine[127];
} DOS_PSP, *PDOS_PSP;
typedef struct _DOS_SFT_ENTRY
{
WORD ReferenceCount;
WORD Mode;
BYTE Attribute;
WORD DeviceInfo;
DWORD DriveParamBlock;
WORD FirstCluster;
WORD FileTime;
WORD FileDate;
DWORD FileSize;
DWORD CurrentOffset;
WORD LastClusterAccessed;
DWORD DirEntSector;
BYTE DirEntryIndex;
CHAR FileName[11];
BYTE Reserved0[6];
WORD OwnerPsp;
BYTE Reserved1[8];
} DOS_SFT_ENTRY, *PDOS_SFT_ENTRY;
typedef struct _DOS_SFT
{
DWORD NextTablePtr;
WORD FileCount;
DOS_SFT_ENTRY Entry[ANYSIZE_ARRAY];
} DOS_SFT, *PDOS_SFT;
typedef struct _DOS_INPUT_BUFFER
{
BYTE MaxLength, Length;
CHAR Buffer[ANYSIZE_ARRAY];
} DOS_INPUT_BUFFER, *PDOS_INPUT_BUFFER;
#pragma pack(pop)
/* FUNCTIONS ******************************************************************/
extern LPVOID BaseAddress;
@ -217,47 +35,7 @@ extern BOOLEAN VdmRunning;
extern LPCWSTR ExceptionName[];
VOID DisplayMessage(LPCWSTR Format, ...);
BOOLEAN BiosInitialize();
VOID BiosUpdateConsole(ULONG StartAddress, ULONG EndAddress);
VOID BiosPrintCharacter(CHAR Character, BYTE Attribute);
BOOLEAN DosInitialize();
WORD DosAllocateMemory(WORD Size, WORD *MaxAvailable);
BOOLEAN DosFreeMemory(WORD BlockData);
BOOLEAN DosResizeMemory(WORD BlockData, WORD NewSize, WORD *MaxAvailable);
BOOLEAN DosCreateProcess(LPCSTR CommandLine, WORD EnvBlock);
VOID DosInt20h(WORD CodeSegment);
VOID DosInt21h(WORD CodeSegment);
VOID DosBreakInterrupt();
VOID BiosVideoService();
VOID BiosHandleIrq(BYTE IrqNumber);
BYTE PicReadCommand(BYTE Port);
VOID PicWriteCommand(BYTE Port, BYTE Value);
BYTE PicReadData(BYTE Port);
VOID PicWriteData(BYTE Port, BYTE Value);
VOID PicInterruptRequest(BYTE Number);
VOID PitInitialize();
VOID PitWriteCommand(BYTE Value);
BYTE PitReadData(BYTE Channel);
VOID PitWriteData(BYTE Channel, BYTE Value);
VOID PitDecrementCount();
VOID CheckForInputEvents();
BYTE KeyboardReadStatus();
VOID KeyboardWriteCommand(BYTE Command);
BYTE KeyboardReadData();
VOID KeyboardWriteData(BYTE Data);
VOID EmulatorSetStack(WORD Segment, WORD Offset);
VOID EmulatorExecute(WORD Segment, WORD Offset);
VOID EmulatorInterrupt(BYTE Number);
VOID EmulatorExternalInterrupt(BYTE Number);
ULONG EmulatorGetRegister(ULONG Register);
VOID EmulatorSetRegister(ULONG Register, ULONG Value);
VOID EmulatorSetFlag(ULONG Flag);
VOID EmulatorClearFlag(ULONG Flag);
BOOLEAN EmulatorGetFlag(ULONG Flag);
BOOLEAN EmulatorInitialize();
VOID EmulatorStep();
VOID EmulatorCleanup();
VOID EmulatorHalt();
VOID EmulatorSetA20(BOOLEAN Enabled);
#endif
/* EOF */

205
subsystems/ntvdm/pic.c Normal file
View file

@ -0,0 +1,205 @@
/*
* COPYRIGHT: GPL - See COPYING in the top level directory
* PROJECT: ReactOS Virtual DOS Machine
* FILE: pic.c
* PURPOSE: Programmable Interrupt Controller emulation
* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
*/
/* INCLUDES *******************************************************************/
#include "pic.h"
#include "emulator.h"
/* PRIVATE VARIABLES **********************************************************/
static PIC MasterPic, SlavePic;
/* PUBLIC FUNCTIONS ***********************************************************/
BYTE PicReadCommand(BYTE Port)
{
PPIC Pic;
/* Which PIC are we accessing? */
if (Port == PIC_MASTER_CMD) Pic = &MasterPic;
else Pic = &SlavePic;
if (Pic->ReadIsr)
{
/* Read the in-service register */
Pic->ReadIsr = FALSE;
return Pic->InServiceRegister;
}
else
{
/* The IRR is always 0, as the emulated CPU receives the interrupt instantly */
return 0;
}
}
VOID PicWriteCommand(BYTE Port, BYTE Value)
{
PPIC Pic;
/* Which PIC are we accessing? */
if (Port == PIC_MASTER_CMD) Pic = &MasterPic;
else Pic = &SlavePic;
if (Value & PIC_ICW1)
{
/* Start initialization */
Pic->Initialization = TRUE;
Pic->IntOffset = 0xFF;
Pic->CascadeRegisterSet = FALSE;
Pic->ConfigRegister = Value;
return;
}
if (Value & PIC_OCW3)
{
/* This is an OCR3 */
if (Value == PIC_OCW3_READ_ISR)
{
/* Return the ISR on next read from command port */
Pic->ReadIsr = TRUE;
}
return;
}
/* This is an OCW2 */
if (Value & PIC_OCW2_EOI)
{
if (Value & PIC_OCW2_SL)
{
/* If the SL bit is set, clear a specific IRQ */
Pic->InServiceRegister &= ~(1 << (Value & PIC_OCW2_NUM_MASK));
}
else
{
/* Otherwise, clear all of them */
Pic->InServiceRegister = 0;
}
}
}
BYTE PicReadData(BYTE Port)
{
/* Read the mask register */
if (Port == PIC_MASTER_DATA) return MasterPic.MaskRegister;
else return SlavePic.MaskRegister;
}
VOID PicWriteData(BYTE Port, BYTE Value)
{
PPIC Pic;
/* Which PIC are we accessing? */
if (Port == PIC_MASTER_DATA) Pic = &MasterPic;
else Pic = &SlavePic;
/* Is the PIC ready? */
if (!Pic->Initialization)
{
/* Yes, this is an OCW1 */
Pic->MaskRegister = Value;
return;
}
/* Has the interrupt offset been set? */
if (Pic->IntOffset == 0xFF)
{
/* This is an ICW2, set the offset (last three bits always zero) */
Pic->IntOffset = Value & 0xF8;
/* Check if we are in single mode and don't need an ICW4 */
if ((Pic->ConfigRegister & PIC_ICW1_SINGLE)
&& !(Pic->ConfigRegister & PIC_ICW1_ICW4))
{
/* Yes, done initializing */
Pic->Initialization = FALSE;
}
return;
}
/* Check if we are in cascade mode and the cascade register was not set */
if (!(Pic->ConfigRegister & PIC_ICW1_SINGLE) && !Pic->CascadeRegisterSet)
{
/* This is an ICW3 */
Pic->CascadeRegister = Value;
Pic->CascadeRegisterSet = TRUE;
/* Check if we need an ICW4 */
if (!(Pic->ConfigRegister & PIC_ICW1_ICW4))
{
/* No, done initializing */
Pic->Initialization = FALSE;
}
return;
}
/* This must be an ICW4, we will ignore the 8086 bit (assume always set) */
if (Value & PIC_ICW4_AEOI)
{
/* Use automatic end-of-interrupt */
Pic->AutoEoi = TRUE;
}
/* Done initializing */
Pic->Initialization = FALSE;
}
VOID PicInterruptRequest(BYTE Number)
{
BYTE i;
if (Number >= 0 && Number < 8)
{
/* Check if any of the higher-priorirty interrupts are busy */
for (i = 0; i <= Number ; i++)
{
if (MasterPic.InServiceRegister & (1 << Number)) return;
}
/* Check if the interrupt is masked */
if (MasterPic.MaskRegister & (1 << Number)) return;
/* Set the appropriate bit in the ISR and interrupt the CPU */
if (!MasterPic.AutoEoi) MasterPic.InServiceRegister |= 1 << Number;
EmulatorExternalInterrupt(MasterPic.IntOffset + Number);
}
else if (Number >= 8 && Number < 16)
{
Number -= 8;
/*
* The slave PIC is connected to IRQ 2, always! If the master PIC
* was misconfigured, don't do anything.
*/
if (!(MasterPic.CascadeRegister & (1 << 2))
|| SlavePic.CascadeRegister != 2)
{
return;
}
/* Check if any of the higher-priorirty interrupts are busy */
if (MasterPic.InServiceRegister != 0) return;
for (i = 0; i <= Number ; i++)
{
if (SlavePic.InServiceRegister & (1 << Number)) return;
}
/* Check if the interrupt is masked */
if (SlavePic.MaskRegister & (1 << Number)) return;
/* Set the IRQ 2 bit in the master ISR */
if (!MasterPic.AutoEoi) MasterPic.InServiceRegister |= 1 << 2;
/* Set the appropriate bit in the ISR and interrupt the CPU */
if (!SlavePic.AutoEoi) SlavePic.InServiceRegister |= 1 << Number;
EmulatorExternalInterrupt(SlavePic.IntOffset + Number);
}
}
/* EOF */

57
subsystems/ntvdm/pic.h Normal file
View file

@ -0,0 +1,57 @@
/*
* COPYRIGHT: GPL - See COPYING in the top level directory
* PROJECT: ReactOS Virtual DOS Machine
* FILE: pic.h
* PURPOSE: Programmable Interrupt Controller emulation (header file)
* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
*/
#ifndef _PIC_H_
#define _PIC_H_
/* INCLUDES *******************************************************************/
#include "ntvdm.h"
/* DEFINES ********************************************************************/
#define PIC_MASTER_CMD 0x20
#define PIC_MASTER_DATA 0x21
#define PIC_SLAVE_CMD 0xA0
#define PIC_SLAVE_DATA 0xA1
#define PIC_ICW1 0x10
#define PIC_ICW1_ICW4 (1 << 0)
#define PIC_ICW1_SINGLE (1 << 1)
#define PIC_ICW4_8086 (1 << 0)
#define PIC_ICW4_AEOI (1 << 1)
#define PIC_OCW2_NUM_MASK 0x07
#define PIC_OCW2_EOI (1 << 5)
#define PIC_OCW2_SL (1 << 6)
#define PIC_OCW3 (1 << 3)
#define PIC_OCW3_READ_ISR 0x0B
typedef struct _PIC
{
BOOLEAN Initialization;
BYTE MaskRegister;
BYTE InServiceRegister;
BYTE IntOffset;
BYTE ConfigRegister;
BYTE CascadeRegister;
BOOLEAN CascadeRegisterSet;
BOOLEAN AutoEoi;
BOOLEAN Slave;
BOOLEAN ReadIsr;
} PIC, *PPIC;
/* FUNCTIONS ******************************************************************/
BYTE PicReadCommand(BYTE Port);
VOID PicWriteCommand(BYTE Port, BYTE Value);
BYTE PicReadData(BYTE Port);
VOID PicWriteData(BYTE Port, BYTE Value);
VOID PicInterruptRequest(BYTE Number);
#endif
/* EOF */

313
subsystems/ntvdm/ps2.c Normal file
View file

@ -0,0 +1,313 @@
/*
* COPYRIGHT: GPL - See COPYING in the top level directory
* PROJECT: ReactOS Virtual DOS Machine
* FILE: ps2.c
* PURPOSE: PS/2 controller emulation
* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
*/
/* INCLUDES *******************************************************************/
#include "ps2.h"
#include "emulator.h"
#include "pic.h"
/* PRIVATE VARIABLES **********************************************************/
static BYTE KeyboardQueue[KEYBOARD_BUFFER_SIZE];
static BOOLEAN KeyboardQueueEmpty = TRUE;
static UINT KeyboardQueueStart = 0;
static UINT KeyboardQueueEnd = 0;
static BYTE KeyboardResponse = 0;
static BOOLEAN KeyboardReadResponse = FALSE, KeyboardWriteResponse = FALSE;
static BYTE KeyboardConfig = PS2_DEFAULT_CONFIG;
/* PRIVATE FUNCTIONS **********************************************************/
static BOOLEAN KeyboardQueuePush(BYTE ScanCode)
{
/* Check if the keyboard queue is full */
if (!KeyboardQueueEmpty && (KeyboardQueueStart == KeyboardQueueEnd))
{
return FALSE;
}
/* Insert the value in the queue */
KeyboardQueue[KeyboardQueueEnd] = ScanCode;
KeyboardQueueEnd++;
KeyboardQueueEnd %= KEYBOARD_BUFFER_SIZE;
/* Since we inserted a value, it's not empty anymore */
KeyboardQueueEmpty = FALSE;
return TRUE;
}
static BOOLEAN KeyboardQueuePop(BYTE *ScanCode)
{
/* Make sure the keyboard queue is not empty */
if (KeyboardQueueEmpty) return FALSE;
/* Get the scan code */
*ScanCode = KeyboardQueue[KeyboardQueueStart];
/* Remove the value from the queue */
KeyboardQueueStart++;
KeyboardQueueStart %= KEYBOARD_BUFFER_SIZE;
/* Check if the queue is now empty */
if (KeyboardQueueStart == KeyboardQueueEnd)
{
KeyboardQueueEmpty = TRUE;
}
return TRUE;
}
/* PUBLIC FUNCTIONS ***********************************************************/
BYTE KeyboardReadStatus()
{
BYTE Status = 0;
/* Set the first bit if the data can be read */
if (KeyboardReadResponse || !KeyboardQueueEmpty) Status |= 1 << 0;
/* Always set bit 2 */
Status |= 1 << 2;
/* Set bit 3 if the next byte goes to the controller */
if (KeyboardWriteResponse) Status |= 1 << 3;
return Status;
}
VOID KeyboardWriteCommand(BYTE Command)
{
switch (Command)
{
/* Read configuration byte */
case 0x20:
{
KeyboardResponse = KeyboardConfig;
KeyboardReadResponse = TRUE;
break;
}
/* Write configuration byte */
case 0x60:
/* Write controller output port */
case 0xD1:
/* Write keyboard output buffer */
case 0xD2:
/* Write mouse output buffer */
case 0xD3:
/* Write mouse input buffer */
case 0xD4:
{
/* These commands require a response */
KeyboardResponse = Command;
KeyboardWriteResponse = TRUE;
break;
}
/* Disable mouse */
case 0xA7:
{
// TODO: Mouse support
break;
}
/* Enable mouse */
case 0xA8:
{
// TODO: Mouse support
break;
}
/* Test mouse port */
case 0xA9:
{
KeyboardResponse = 0;
KeyboardReadResponse = TRUE;
break;
}
/* Test PS/2 controller */
case 0xAA:
{
KeyboardResponse = 0x55;
KeyboardReadResponse = TRUE;
break;
}
/* Disable keyboard */
case 0xAD:
{
// TODO: Not implemented
break;
}
/* Enable keyboard */
case 0xAE:
{
// TODO: Not implemented
break;
}
/* Read controller output port */
case 0xD0:
{
// TODO: Not implemented
break;
}
/* CPU Reset */
case 0xF0:
case 0xF2:
case 0xF4:
case 0xF6:
case 0xF8:
case 0xFA:
case 0xFC:
case 0xFE:
{
/* Stop the simulation */
VdmRunning = FALSE;
break;
}
}
}
BYTE KeyboardReadData()
{
BYTE Value = 0;
/* If there was a response byte from the controller, return it */
if (KeyboardReadResponse)
{
KeyboardReadResponse = FALSE;
return KeyboardResponse;
}
/* Otherwise, read the data from the queue */
KeyboardQueuePop(&Value);
return Value;
}
VOID KeyboardWriteData(BYTE Data)
{
/* Check if the controller is waiting for a response */
if (KeyboardWriteResponse)
{
KeyboardWriteResponse = FALSE;
/* Check which command it was */
switch (KeyboardResponse)
{
/* Write configuration byte */
case 0x60:
{
KeyboardConfig = Data;
break;
}
/* Write controller output */
case 0xD1:
{
/* Check if bit 0 is unset */
if (!(Data & (1 << 0)))
{
/* CPU disabled - end simulation */
VdmRunning = FALSE;
}
/* Update the A20 line setting */
EmulatorSetA20(Data & (1 << 1));
break;
}
case 0xD2:
{
/* Push the data byte to the keyboard queue */
KeyboardQueuePush(Data);
break;
}
case 0xD3:
{
// TODO: Mouse support
break;
}
case 0xD4:
{
// TODO: Mouse support
break;
}
}
return;
}
// TODO: Implement PS/2 device commands
}
VOID CheckForInputEvents()
{
PINPUT_RECORD Buffer;
HANDLE ConsoleInput = GetStdHandle(STD_INPUT_HANDLE);
DWORD i, j, Count, TotalEvents;
BYTE ScanCode;
/* Get the number of input events */
if (!GetNumberOfConsoleInputEvents(ConsoleInput, &Count)) return;
if (Count == 0) return;
/* Allocate the buffer */
Buffer = (PINPUT_RECORD)HeapAlloc(GetProcessHeap(), 0, Count * sizeof(INPUT_RECORD));
if (Buffer == NULL) return;
/* Peek the input events */
if (!ReadConsoleInput(ConsoleInput, Buffer, Count, &TotalEvents)) goto Cleanup;
for (i = 0; i < TotalEvents; i++)
{
/* Check if this is a key event */
if (Buffer[i].EventType != KEY_EVENT) continue;
/* Get the scan code */
ScanCode = Buffer[i].Event.KeyEvent.wVirtualScanCode;
/* If this is a key release, set the highest bit in the scan code */
if (!Buffer[i].Event.KeyEvent.bKeyDown) ScanCode |= 0x80;
/* Push the scan code onto the keyboard queue */
for (j = 0; j < Buffer[i].Event.KeyEvent.wRepeatCount; j++)
{
KeyboardQueuePush(ScanCode);
}
/* Yes, IRQ 1 */
PicInterruptRequest(1);
/* Stop the loop */
break;
}
Cleanup:
HeapFree(GetProcessHeap(), 0, Buffer);
}
/* EOF */

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/*
* COPYRIGHT: GPL - See COPYING in the top level directory
* PROJECT: ReactOS Virtual DOS Machine
* FILE: ps2.h
* PURPOSE: PS/2 controller emulation (header file)
* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
*/
#ifndef _PS2_H_
#define _PS2_H_
/* INCLUDES *******************************************************************/
#include "ntvdm.h"
/* DEFINES ********************************************************************/
#define KEYBOARD_BUFFER_SIZE 32
#define PS2_DATA_PORT 0x60
#define PS2_CONTROL_PORT 0x64
#define PS2_DEFAULT_CONFIG 0x05
#define KEYBOARD_ACK 0xFA
#define KEYBOARD_RESEND 0xFE
/* FUNCTIONS ******************************************************************/
BYTE KeyboardReadStatus();
VOID KeyboardWriteCommand(BYTE Command);
BYTE KeyboardReadData();
VOID KeyboardWriteData(BYTE Data);
VOID CheckForInputEvents();
#endif

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/*
* COPYRIGHT: GPL - See COPYING in the top level directory
* PROJECT: ReactOS Virtual DOS Machine
* FILE: timer.c
* PURPOSE: Programmable Interval Timer emulation
* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
*/
/* INCLUDES *******************************************************************/
#include "timer.h"
#include "pic.h"
/* PRIVATE VARIABLES **********************************************************/
static PIT_CHANNEL PitChannels[PIT_CHANNELS];
/* PUBLIC FUNCTIONS ***********************************************************/
VOID PitWriteCommand(BYTE Value)
{
BYTE Channel = Value >> 6;
BYTE Mode = (Value >> 1) & 0x07;
/* Check if this is a counter latch command */
if (((Value >> 4) & 3) == 0)
{
PitChannels[Channel].LatchSet = TRUE;
PitChannels[Channel].LatchedValue = PitChannels[Channel].CurrentValue;
return;
}
/* Set the access mode and reset flip-flops */
PitChannels[Channel].AccessMode = (Value >> 4) & 3;
PitChannels[Channel].Pulsed = FALSE;
PitChannels[Channel].LatchSet = FALSE;
PitChannels[Channel].InputFlipFlop = FALSE;
PitChannels[Channel].OutputFlipFlop = FALSE;
switch (Mode)
{
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
{
PitChannels[Channel].Mode = Mode;
break;
}
case 6:
{
PitChannels[Channel].Mode = PIT_MODE_RATE_GENERATOR;
break;
}
case 7:
{
PitChannels[Channel].Mode = PIT_MODE_SQUARE_WAVE;
break;
}
}
}
BYTE PitReadData(BYTE Channel)
{
WORD CurrentValue = PitChannels[Channel].CurrentValue;
BYTE AccessMode = PitChannels[Channel].AccessMode;
/* Check if the value was latched */
if (PitChannels[Channel].LatchSet)
{
CurrentValue = PitChannels[Channel].LatchedValue;
if (AccessMode == 1 || AccessMode == 2)
{
/* The latched value was read as one byte */
PitChannels[Channel].LatchSet = FALSE;
}
}
/* Use the flip-flop for access mode 3 */
if (AccessMode == 3)
{
AccessMode = PitChannels[Channel].InputFlipFlop ? 1 : 2;
PitChannels[Channel].InputFlipFlop = !PitChannels[Channel].InputFlipFlop;
/* Check if this was the last read for the latched value */
if (!PitChannels[Channel].InputFlipFlop)
{
/* Yes, the latch value was read as two bytes */
PitChannels[Channel].LatchSet = FALSE;
}
}
switch (AccessMode)
{
case 1:
{
/* Low byte */
return CurrentValue & 0x00FF;
}
case 2:
{
/* High byte */
return CurrentValue >> 8;
}
}
/* Shouldn't get here */
return 0;
}
VOID PitWriteData(BYTE Channel, BYTE Value)
{
BYTE AccessMode = PitChannels[Channel].AccessMode;
/* Use the flip-flop for access mode 3 */
if (PitChannels[Channel].AccessMode == 3)
{
AccessMode = PitChannels[Channel].InputFlipFlop ? 1 : 2;
PitChannels[Channel].InputFlipFlop = !PitChannels[Channel].InputFlipFlop;
}
switch (AccessMode)
{
case 1:
{
/* Low byte */
PitChannels[Channel].ReloadValue &= 0xFF00;
PitChannels[Channel].ReloadValue |= Value;
break;
}
case 2:
{
/* High byte */
PitChannels[Channel].ReloadValue &= 0x00FF;
PitChannels[Channel].ReloadValue |= Value << 8;
}
}
}
VOID PitDecrementCount()
{
INT i;
for (i = 0; i < PIT_CHANNELS; i++)
{
switch (PitChannels[i].Mode)
{
case PIT_MODE_INT_ON_TERMINAL_COUNT:
{
/* Decrement the value */
PitChannels[i].CurrentValue--;
/* Did it fall to the terminal count? */
if (PitChannels[i].CurrentValue == 0 && !PitChannels[i].Pulsed)
{
/* Yes, raise the output line */
if (i == 0) PicInterruptRequest(0);
PitChannels[i].Pulsed = TRUE;
}
break;
}
case PIT_MODE_RATE_GENERATOR:
{
/* Decrement the value */
PitChannels[i].CurrentValue--;
/* Did it fall to zero? */
if (PitChannels[i].CurrentValue != 0) break;
/* Yes, raise the output line and reload */
if (i == 0) PicInterruptRequest(0);
PitChannels[i].CurrentValue = PitChannels[i].ReloadValue;
break;
}
case PIT_MODE_SQUARE_WAVE:
{
/* Decrement the value by 2 */
PitChannels[i].CurrentValue -= 2;
/* Did it fall to zero? */
if (PitChannels[i].CurrentValue != 0) break;
/* Yes, toggle the flip-flop */
PitChannels[i].OutputFlipFlop = !PitChannels[i].OutputFlipFlop;
/* Did this create a rising edge in the signal? */
if (PitChannels[i].OutputFlipFlop)
{
/* Yes, IRQ 0 if this is channel 0 */
if (i == 0) PicInterruptRequest(0);
}
/* Reload the value, but make sure it's even */
if (PitChannels[i].ReloadValue % 2)
{
/* It's odd, reduce it by 1 */
PitChannels[i].CurrentValue = PitChannels[i].ReloadValue - 1;
}
else
{
/* It was even */
PitChannels[i].CurrentValue = PitChannels[i].ReloadValue;
}
break;
}
case PIT_MODE_SOFTWARE_STROBE:
{
// TODO: NOT IMPLEMENTED
break;
}
case PIT_MODE_HARDWARE_ONE_SHOT:
case PIT_MODE_HARDWARE_STROBE:
{
/* These modes do not work on x86 PCs */
break;
}
}
}
}
/* EOF */

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/*
* COPYRIGHT: GPL - See COPYING in the top level directory
* PROJECT: ReactOS Virtual DOS Machine
* FILE: timer.h
* PURPOSE: Programmable Interval Timer emulation (header file)
* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
*/
#ifndef _TIMER_H_
#define _TIMER_H_
/* INCLUDES *******************************************************************/
#include "ntvdm.h"
/* DEFINES ********************************************************************/
#define PIT_CHANNELS 3
#define PIT_BASE_FREQUENCY 1193182LL
#define PIT_DATA_PORT(x) (0x40 + (x))
#define PIT_COMMAND_PORT 0x43
enum
{
PIT_MODE_INT_ON_TERMINAL_COUNT,
PIT_MODE_HARDWARE_ONE_SHOT,
PIT_MODE_RATE_GENERATOR,
PIT_MODE_SQUARE_WAVE,
PIT_MODE_SOFTWARE_STROBE,
PIT_MODE_HARDWARE_STROBE
};
typedef struct _PIT_CHANNEL
{
WORD ReloadValue;
WORD CurrentValue;
WORD LatchedValue;
INT Mode;
BOOLEAN Pulsed;
BOOLEAN LatchSet;
BOOLEAN InputFlipFlop;
BOOLEAN OutputFlipFlop;
BYTE AccessMode;
} PIT_CHANNEL, *PPIT_CHANNEL;
/* FUNCTIONS ******************************************************************/
VOID PitWriteCommand(BYTE Value);
BYTE PitReadData(BYTE Channel);
VOID PitWriteData(BYTE Channel, BYTE Value);
VOID PitDecrementCount();
#endif
/* EOF */