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reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c

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/*
* COPYRIGHT: GPL - See COPYING in the top level directory
* PROJECT: ReactOS Virtual DOS Machine
* FILE: subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c
* PURPOSE: DOS32 Kernel
* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
* Hermes Belusca-Maito (hermes.belusca@sfr.fr)
*/
/* INCLUDES *******************************************************************/
#include "ntvdm.h"
#define NDEBUG
#include <debug.h>
#include "emulator.h"
#include "cpu/cpu.h"
#include "int32.h"
#include "dos.h"
#include "dos/dem.h"
#include "country.h"
#include "device.h"
#include "handle.h"
#include "dosfiles.h"
#include "memory.h"
#include "process.h"
#include "himem.h"
#include "bios/bios.h"
#include "io.h"
#include "hardware/ps2.h"
#include "emsdrv.h"
/* PRIVATE VARIABLES **********************************************************/
CALLBACK16 DosContext;
/* PUBLIC VARIABLES ***********************************************************/
/* Global DOS data area contained in guest memory */
PDOS_DATA DosData;
/* Easy accessors to useful DOS data area parts */
PDOS_SYSVARS SysVars;
PDOS_SDA Sda;
/* PRIVATE FUNCTIONS **********************************************************/
static BOOLEAN DosChangeDrive(BYTE Drive)
{
CHAR DirectoryPath[DOS_CMDLINE_LENGTH + 1];
/* Make sure the drive exists */
if (Drive >= SysVars->NumLocalDrives) return FALSE;
RtlZeroMemory(DirectoryPath, sizeof(DirectoryPath));
/* Find the path to the new current directory */
snprintf(DirectoryPath,
DOS_CMDLINE_LENGTH,
"%c:\\%s",
'A' + Drive,
DosData->CurrentDirectories[Drive]);
/* Change the current directory of the process */
if (!SetCurrentDirectoryA(DirectoryPath)) return FALSE;
/* Set the current drive */
Sda->CurrentDrive = Drive;
/* Return success */
return TRUE;
}
static BOOLEAN DosChangeDirectory(LPSTR Directory)
{
BYTE DriveNumber;
DWORD Attributes;
LPSTR Path;
CHAR CurrentDirectory[MAX_PATH];
CHAR DosDirectory[DOS_DIR_LENGTH];
/* Make sure the directory path is not too long */
if (strlen(Directory) >= DOS_DIR_LENGTH)
{
Sda->LastErrorCode = ERROR_PATH_NOT_FOUND;
return FALSE;
}
/* Check whether the directory string is of format "X:..." */
if (strlen(Directory) >= 2 && Directory[1] == ':')
{
/* Get the drive number */
DriveNumber = RtlUpperChar(Directory[0]) - 'A';
/* Make sure the drive exists */
if (DriveNumber >= SysVars->NumLocalDrives)
{
Sda->LastErrorCode = ERROR_PATH_NOT_FOUND;
return FALSE;
}
}
else
{
/* Keep the current drive number */
DriveNumber = Sda->CurrentDrive;
}
/* Get the file attributes */
Attributes = GetFileAttributesA(Directory);
/* Make sure the path exists and is a directory */
if ((Attributes == INVALID_FILE_ATTRIBUTES) ||
!(Attributes & FILE_ATTRIBUTE_DIRECTORY))
{
Sda->LastErrorCode = ERROR_PATH_NOT_FOUND;
return FALSE;
}
/* Check if this is the current drive */
if (DriveNumber == Sda->CurrentDrive)
{
/* Change the directory */
if (!SetCurrentDirectoryA(Directory))
{
Sda->LastErrorCode = LOWORD(GetLastError());
return FALSE;
}
}
/* Get the (possibly new) current directory (needed if we specified a relative directory) */
if (!GetCurrentDirectoryA(sizeof(CurrentDirectory), CurrentDirectory))
{
// TODO: Use some kind of default path?
return FALSE;
}
/* Convert it to a DOS path */
if (!GetShortPathNameA(CurrentDirectory, DosDirectory, sizeof(DosDirectory)))
{
// TODO: Use some kind of default path?
return FALSE;
}
/* Get the directory part of the path and set the current directory for the drive */
Path = strchr(DosDirectory, '\\');
if (Path != NULL)
{
Path++; // Skip the backslash
strncpy(DosData->CurrentDirectories[DriveNumber], Path, DOS_DIR_LENGTH);
}
else
{
DosData->CurrentDirectories[DriveNumber][0] = '\0';
}
/* Return success */
return TRUE;
}
/* PUBLIC FUNCTIONS ***********************************************************/
BOOLEAN DosControlBreak(VOID)
{
setCF(0);
/* Print an extra newline */
DosPrintCharacter(DOS_OUTPUT_HANDLE, '\r');
DosPrintCharacter(DOS_OUTPUT_HANDLE, '\n');
/* Call interrupt 0x23 */
Int32Call(&DosContext, 0x23);
if (getCF())
{
DosTerminateProcess(Sda->CurrentPsp, 0, 0);
return TRUE;
}
return FALSE;
}
VOID WINAPI DosInt20h(LPWORD Stack)
{
/*
* This is the exit interrupt (alias to INT 21h, AH=00h).
* CS must be the PSP segment.
*/
DosTerminateProcess(Stack[STACK_CS], 0, 0);
}
VOID WINAPI DosInt21h(LPWORD Stack)
{
BYTE Character;
SYSTEMTIME SystemTime;
PCHAR String;
Sda->InDos++;
/* Save the value of SS:SP on entry in the PSP */
SEGMENT_TO_PSP(Sda->CurrentPsp)->LastStack =
MAKELONG(getSP() + (STACK_FLAGS + 1) * 2, getSS());
/* Check the value in the AH register */
switch (getAH())
{
/* Terminate Program */
case 0x00:
{
/* CS must be the PSP segment */
DosTerminateProcess(Stack[STACK_CS], 0, 0);
break;
}
/* Read Character from STDIN with Echo */
case 0x01:
{
DPRINT("INT 21h, AH = 01h\n");
Character = DosReadCharacter(DOS_INPUT_HANDLE, TRUE);
if (Character == 0x03 && DosControlBreak()) break;
setAL(Character);
break;
}
/* Write Character to STDOUT */
case 0x02:
{
// FIXME: Under DOS 2+, output handle may be redirected!!!!
Character = getDL();
DosPrintCharacter(DOS_OUTPUT_HANDLE, Character);
/*
* We return the output character (DOS 2.1+).
* Also, if we're going to output a TAB, then
* don't return a TAB but a SPACE instead.
* See Ralf Brown: http://www.ctyme.com/intr/rb-2554.htm
* for more information.
*/
setAL(Character == '\t' ? ' ' : Character);
break;
}
/* Read Character from STDAUX */
case 0x03:
{
// FIXME: Really read it from STDAUX!
DPRINT1("INT 16h, 03h: Read character from STDAUX is HALFPLEMENTED\n");
// setAL(DosReadCharacter());
break;
}
/* Write Character to STDAUX */
case 0x04:
{
// FIXME: Really write it to STDAUX!
DPRINT1("INT 16h, 04h: Write character to STDAUX is HALFPLEMENTED\n");
// DosPrintCharacter(getDL());
break;
}
/* Write Character to Printer */
case 0x05:
{
// FIXME: Really write it to printer!
DPRINT1("INT 16h, 05h: Write character to printer is HALFPLEMENTED -\n\n");
DPRINT1("0x%p\n", getDL());
DPRINT1("\n\n-----------\n\n");
break;
}
/* Direct Console I/O */
case 0x06:
{
Character = getDL();
// FIXME: Under DOS 2+, output handle may be redirected!!!!
if (Character != 0xFF)
{
/* Output */
DosPrintCharacter(DOS_OUTPUT_HANDLE, Character);
/*
* We return the output character (DOS 2.1+).
* See Ralf Brown: http://www.ctyme.com/intr/rb-2558.htm
* for more information.
*/
setAL(Character);
}
else
{
/* Input */
if (DosCheckInput())
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_ZF;
setAL(DosReadCharacter(DOS_INPUT_HANDLE, FALSE));
}
else
{
/* No character available */
Stack[STACK_FLAGS] |= EMULATOR_FLAG_ZF;
setAL(0x00);
}
}
break;
}
/* Direct Character Input without Echo */
case 0x07:
{
DPRINT("Direct char input without echo\n");
setAL(DosReadCharacter(DOS_INPUT_HANDLE, FALSE));
break;
}
/* Character Input without Echo */
case 0x08:
{
DPRINT("Char input without echo\n");
Character = DosReadCharacter(DOS_INPUT_HANDLE, FALSE);
if (Character == 0x03 && DosControlBreak()) break;
setAL(Character);
break;
}
/* Write String to STDOUT */
case 0x09:
{
String = (PCHAR)SEG_OFF_TO_PTR(getDS(), getDX());
while (*String != '$')
{
DosPrintCharacter(DOS_OUTPUT_HANDLE, *String);
String++;
}
/*
* We return the terminating character (DOS 2.1+).
* See Ralf Brown: http://www.ctyme.com/intr/rb-2562.htm
* for more information.
*/
setAL('$'); // *String
break;
}
/* Read Buffered Input */
case 0x0A:
{
PDOS_INPUT_BUFFER InputBuffer = (PDOS_INPUT_BUFFER)SEG_OFF_TO_PTR(getDS(), getDX());
DPRINT("Read Buffered Input\n");
if (InputBuffer->MaxLength == 0) break;
/* Read from standard input */
InputBuffer->Length = DosReadLineBuffered(
DOS_INPUT_HANDLE,
MAKELONG(getDX() + FIELD_OFFSET(DOS_INPUT_BUFFER, Buffer), getDS()),
InputBuffer->MaxLength
);
break;
}
/* Get STDIN Status */
case 0x0B:
{
setAL(DosCheckInput() ? 0xFF : 0x00);
break;
}
/* Flush Buffer and Read STDIN */
case 0x0C:
{
BYTE InputFunction = getAL();
/* Flush STDIN buffer */
DosFlushFileBuffers(DOS_INPUT_HANDLE);
/*
* If the input function number contained in AL is valid, i.e.
* AL == 0x01 or 0x06 or 0x07 or 0x08 or 0x0A, call ourselves
* recursively with AL == AH.
*/
if (InputFunction == 0x01 || InputFunction == 0x06 ||
InputFunction == 0x07 || InputFunction == 0x08 ||
InputFunction == 0x0A)
{
/* Call ourselves recursively */
setAH(InputFunction);
DosInt21h(Stack);
}
break;
}
/* Disk Reset */
case 0x0D:
{
PDOS_PSP PspBlock = SEGMENT_TO_PSP(Sda->CurrentPsp);
// TODO: Flush what's needed.
DPRINT1("INT 21h, 0Dh is UNIMPLEMENTED\n");
/* Clear CF in DOS 6 only */
if (PspBlock->DosVersion == 0x0006)
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
break;
}
/* Set Default Drive */
case 0x0E:
{
DosChangeDrive(getDL());
setAL(SysVars->NumLocalDrives);
break;
}
/* NULL Function for CP/M Compatibility */
case 0x18:
{
/*
* This function corresponds to the CP/M BDOS function
* "get bit map of logged drives", which is meaningless
* under MS-DOS.
*
* For: PTS-DOS 6.51 & S/DOS 1.0 - EXTENDED RENAME FILE USING FCB
* See Ralf Brown: http://www.ctyme.com/intr/rb-2584.htm
* for more information.
*/
setAL(0x00);
break;
}
/* Get Default Drive */
case 0x19:
{
setAL(Sda->CurrentDrive);
break;
}
/* Set Disk Transfer Area */
case 0x1A:
{
Sda->DiskTransferArea = MAKELONG(getDX(), getDS());
break;
}
/* NULL Function for CP/M Compatibility */
case 0x1D:
case 0x1E:
{
/*
* Function 0x1D corresponds to the CP/M BDOS function
* "get bit map of read-only drives", which is meaningless
* under MS-DOS.
* See Ralf Brown: http://www.ctyme.com/intr/rb-2592.htm
* for more information.
*
* Function 0x1E corresponds to the CP/M BDOS function
* "set file attributes", which was meaningless under MS-DOS 1.x.
* See Ralf Brown: http://www.ctyme.com/intr/rb-2593.htm
* for more information.
*/
setAL(0x00);
break;
}
/* NULL Function for CP/M Compatibility */
case 0x20:
{
/*
* This function corresponds to the CP/M BDOS function
* "get/set default user (sublibrary) number", which is meaningless
* under MS-DOS.
*
* For: S/DOS 1.0+ & PTS-DOS 6.51+ - GET OEM REVISION
* See Ralf Brown: http://www.ctyme.com/intr/rb-2596.htm
* for more information.
*/
setAL(0x00);
break;
}
/* Set Interrupt Vector */
case 0x25:
{
ULONG FarPointer = MAKELONG(getDX(), getDS());
DPRINT1("Setting interrupt 0x%02X to %04X:%04X ...\n",
getAL(), HIWORD(FarPointer), LOWORD(FarPointer));
/* Write the new far pointer to the IDT */
((PULONG)BaseAddress)[getAL()] = FarPointer;
break;
}
/* Create New PSP */
case 0x26:
{
/* DOS 2+ assumes that the caller's CS is the segment of the PSP to copy */
DosClonePsp(getDX(), Stack[STACK_CS]);
break;
}
/* Parse Filename into FCB */
case 0x29:
{
PCHAR FileName = (PCHAR)SEG_OFF_TO_PTR(getDS(), getSI());
PDOS_FCB Fcb = (PDOS_FCB)SEG_OFF_TO_PTR(getES(), getDI());
BYTE Options = getAL();
CHAR FillChar = ' ';
UINT i;
if (FileName[1] == ':')
{
/* Set the drive number */
Fcb->DriveNumber = RtlUpperChar(FileName[0]) - 'A' + 1;
/* Skip to the file name part */
FileName += 2;
}
else
{
/* No drive number specified */
if (Options & (1 << 1)) Fcb->DriveNumber = Sda->CurrentDrive + 1;
else Fcb->DriveNumber = 0;
}
/* Parse the file name */
i = 0;
while ((*FileName > 0x20) && (i < 8))
{
if (*FileName == '.') break;
else if (*FileName == '*')
{
FillChar = '?';
break;
}
Fcb->FileName[i++] = RtlUpperChar(*FileName++);
}
/* Fill the whole field with blanks only if bit 2 is not set */
if ((FillChar != ' ') || (i != 0) || !(Options & (1 << 2)))
{
for (; i < 8; i++) Fcb->FileName[i] = FillChar;
}
/* Skip to the extension part */
while (*FileName > 0x20 && *FileName != '.') FileName++;
if (*FileName == '.') FileName++;
/* Now parse the extension */
i = 0;
FillChar = ' ';
while ((*FileName > 0x20) && (i < 3))
{
if (*FileName == '*')
{
FillChar = '?';
break;
}
Fcb->FileExt[i++] = RtlUpperChar(*FileName++);
}
/* Fill the whole field with blanks only if bit 3 is not set */
if ((FillChar != ' ') || (i != 0) || !(Options & (1 << 3)))
{
for (; i < 3; i++) Fcb->FileExt[i] = FillChar;
}
break;
}
/* Get System Date */
case 0x2A:
{
GetLocalTime(&SystemTime);
setCX(SystemTime.wYear);
setDX(MAKEWORD(SystemTime.wDay, SystemTime.wMonth));
setAL(SystemTime.wDayOfWeek);
break;
}
/* Set System Date */
case 0x2B:
{
GetLocalTime(&SystemTime);
SystemTime.wYear = getCX();
SystemTime.wMonth = getDH();
SystemTime.wDay = getDL();
/* Return success or failure */
setAL(SetLocalTime(&SystemTime) ? 0x00 : 0xFF);
break;
}
/* Get System Time */
case 0x2C:
{
GetLocalTime(&SystemTime);
setCX(MAKEWORD(SystemTime.wMinute, SystemTime.wHour));
setDX(MAKEWORD(SystemTime.wMilliseconds / 10, SystemTime.wSecond));
break;
}
/* Set System Time */
case 0x2D:
{
GetLocalTime(&SystemTime);
SystemTime.wHour = getCH();
SystemTime.wMinute = getCL();
SystemTime.wSecond = getDH();
SystemTime.wMilliseconds = getDL() * 10; // In hundredths of seconds
/* Return success or failure */
setAL(SetLocalTime(&SystemTime) ? 0x00 : 0xFF);
break;
}
/* Get Disk Transfer Area */
case 0x2F:
{
setES(HIWORD(Sda->DiskTransferArea));
setBX(LOWORD(Sda->DiskTransferArea));
break;
}
/* Get DOS Version */
case 0x30:
{
PDOS_PSP PspBlock = SEGMENT_TO_PSP(Sda->CurrentPsp);
/*
* DOS 2+ - GET DOS VERSION
* See Ralf Brown: http://www.ctyme.com/intr/rb-2711.htm
* for more information.
*/
if (LOBYTE(PspBlock->DosVersion) < 5 || getAL() == 0x00)
{
/*
* Return DOS OEM number:
* 0x00 for IBM PC-DOS
* 0x02 for packaged MS-DOS
* 0xFF for NT DOS
*/
setBH(0xFF);
}
if (LOBYTE(PspBlock->DosVersion) >= 5 && getAL() == 0x01)
{
/*
* Return version flag:
* 1 << 3 if DOS is in ROM,
* 0 (reserved) if not.
*/
setBH(0x00);
}
/* Return DOS 24-bit user serial number in BL:CX */
setBL(0x00);
setCX(0x0000);
/*
* Return DOS version: Minor:Major in AH:AL
* The Windows NT DOS box returns version 5.00, subject to SETVER.
*/
setAX(PspBlock->DosVersion);
break;
}
/* Terminate and Stay Resident */
case 0x31:
{
DPRINT1("Process going resident: %u paragraphs kept\n", getDX());
DosTerminateProcess(Sda->CurrentPsp, getAL(), getDX());
break;
}
/* Extended functionalities */
case 0x33:
{
switch (getAL())
{
/*
* DOS 4+ - GET BOOT DRIVE
*/
case 0x05:
{
setDL(SysVars->BootDrive);
break;
}
/*
* DOS 5+ - GET TRUE VERSION NUMBER
* This function always returns the true version number, unlike
* AH=30h, whose return value may be changed with SETVER.
* See Ralf Brown: http://www.ctyme.com/intr/rb-2730.htm
* for more information.
*/
case 0x06:
{
/*
* Return the true DOS version: Minor:Major in BH:BL
* The Windows NT DOS box returns BX=3205h (version 5.50).
*/
setBX(NTDOS_VERSION);
/* DOS revision 0 */
setDL(0x00);
/* Unpatched DOS */
setDH(0x00);
break;
}
default: // goto Default;
{
DPRINT1("INT 21h, AH = %02Xh, subfunction AL = %02Xh NOT IMPLEMENTED\n",
getAH(), getAL());
}
}
break;
}
/* Get Address of InDOS flag */
case 0x34:
{
setES(DOS_DATA_SEGMENT);
setBX(DOS_DATA_OFFSET(Sda.InDos));
break;
}
/* Get Interrupt Vector */
case 0x35:
{
ULONG FarPointer = ((PULONG)BaseAddress)[getAL()];
/* Read the address from the IDT into ES:BX */
setES(HIWORD(FarPointer));
setBX(LOWORD(FarPointer));
break;
}
/* Get Free Disk Space */
case 0x36:
{
CHAR RootPath[] = "?:\\";
DWORD SectorsPerCluster;
DWORD BytesPerSector;
DWORD NumberOfFreeClusters;
DWORD TotalNumberOfClusters;
if (getDL() == 0x00)
RootPath[0] = 'A' + Sda->CurrentDrive;
else
RootPath[0] = 'A' + getDL() - 1;
if (GetDiskFreeSpaceA(RootPath,
&SectorsPerCluster,
&BytesPerSector,
&NumberOfFreeClusters,
&TotalNumberOfClusters))
{
setAX(LOWORD(SectorsPerCluster));
setCX(LOWORD(BytesPerSector));
setBX(min(NumberOfFreeClusters, 0xFFFF));
setDX(min(TotalNumberOfClusters, 0xFFFF));
}
else
{
/* Error */
setAX(0xFFFF);
}
break;
}
/* SWITCH character - AVAILDEV */
case 0x37:
{
switch (getAL())
{
/*
* DOS 2+ - "SWITCHAR" - GET SWITCH CHARACTER
* This setting is ignored by MS-DOS 4.0+.
* MS-DOS 5+ always return AL=00h/DL=2Fh.
* See Ralf Brown: http://www.ctyme.com/intr/rb-2752.htm
* for more information.
*/
case 0x00:
setDL('/');
setAL(0x00);
break;
/*
* DOS 2+ - "SWITCHAR" - SET SWITCH CHARACTER
* This setting is ignored by MS-DOS 5+.
* See Ralf Brown: http://www.ctyme.com/intr/rb-2753.htm
* for more information.
*/
case 0x01:
// getDL();
setAL(0xFF);
break;
/*
* DOS 2.x and 3.3+ only - "AVAILDEV" - SPECIFY \DEV\ PREFIX USE
* See Ralf Brown: http://www.ctyme.com/intr/rb-2754.htm
* for more information.
*/
case 0x02:
// setDL();
setAL(0xFF);
break;
/*
* DOS 2.x and 3.3+ only - "AVAILDEV" - SPECIFY \DEV\ PREFIX USE
* See Ralf Brown: http://www.ctyme.com/intr/rb-2754.htm
* for more information.
*/
case 0x03:
// getDL();
setAL(0xFF);
break;
/* Invalid subfunction */
default:
setAL(0xFF);
break;
}
break;
}
/* Get/Set Country-dependent Information */
case 0x38:
{
WORD CountryId = getAL() < 0xFF ? getAL() : getBX();
WORD ErrorCode;
ErrorCode = DosGetCountryInfo(&CountryId,
(PDOS_COUNTRY_INFO)SEG_OFF_TO_PTR(getDS(), getDX()));
if (ErrorCode == ERROR_SUCCESS)
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
setBX(CountryId);
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(ErrorCode);
}
break;
}
/* Create Directory */
case 0x39:
{
String = (PCHAR)SEG_OFF_TO_PTR(getDS(), getDX());
if (CreateDirectoryA(String, NULL))
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(LOWORD(GetLastError()));
}
break;
}
/* Remove Directory */
case 0x3A:
{
String = (PCHAR)SEG_OFF_TO_PTR(getDS(), getDX());
if (RemoveDirectoryA(String))
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(LOWORD(GetLastError()));
}
break;
}
/* Set Current Directory */
case 0x3B:
{
String = (PCHAR)SEG_OFF_TO_PTR(getDS(), getDX());
if (DosChangeDirectory(String))
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(Sda->LastErrorCode);
}
break;
}
/* Create or Truncate File */
case 0x3C:
{
WORD FileHandle;
WORD ErrorCode = DosCreateFile(&FileHandle,
(LPCSTR)SEG_OFF_TO_PTR(getDS(), getDX()),
CREATE_ALWAYS,
getCX());
if (ErrorCode == ERROR_SUCCESS)
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
setAX(FileHandle);
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(ErrorCode);
}
break;
}
/* Open File or Device */
case 0x3D:
{
WORD FileHandle;
LPCSTR FileName = (LPCSTR)SEG_OFF_TO_PTR(getDS(), getDX());
WORD ErrorCode = DosOpenFile(&FileHandle, FileName, getAL());
if (ErrorCode == ERROR_SUCCESS)
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
setAX(FileHandle);
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(ErrorCode);
}
break;
}
/* Close File or Device */
case 0x3E:
{
if (DosCloseHandle(getBX()))
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(ERROR_INVALID_HANDLE);
}
break;
}
/* Read from File or Device */
case 0x3F:
{
WORD BytesRead = 0;
WORD ErrorCode;
DPRINT("DosReadFile(0x%04X)\n", getBX());
ErrorCode = DosReadFile(getBX(),
MAKELONG(getDX(), getDS()),
getCX(),
&BytesRead);
if (ErrorCode == ERROR_SUCCESS)
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
setAX(BytesRead);
}
else if (ErrorCode != ERROR_NOT_READY)
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(ErrorCode);
}
break;
}
/* Write to File or Device */
case 0x40:
{
WORD BytesWritten = 0;
WORD ErrorCode = DosWriteFile(getBX(),
MAKELONG(getDX(), getDS()),
getCX(),
&BytesWritten);
if (ErrorCode == ERROR_SUCCESS)
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
setAX(BytesWritten);
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(ErrorCode);
}
break;
}
/* Delete File */
case 0x41:
{
LPSTR FileName = (LPSTR)SEG_OFF_TO_PTR(getDS(), getDX());
if (demFileDelete(FileName) == ERROR_SUCCESS)
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
/*
* See Ralf Brown: http://www.ctyme.com/intr/rb-2797.htm
* "AX destroyed (DOS 3.3) AL seems to be drive of deleted file."
*/
setAL(RtlUpperChar(FileName[0]) - 'A');
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(GetLastError());
}
break;
}
/* Seek File */
case 0x42:
{
DWORD NewLocation;
WORD ErrorCode = DosSeekFile(getBX(),
MAKELONG(getDX(), getCX()),
getAL(),
&NewLocation);
if (ErrorCode == ERROR_SUCCESS)
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
/* Return the new offset in DX:AX */
setDX(HIWORD(NewLocation));
setAX(LOWORD(NewLocation));
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(ErrorCode);
}
break;
}
/* Get/Set File Attributes */
case 0x43:
{
DWORD Attributes;
LPSTR FileName = (LPSTR)SEG_OFF_TO_PTR(getDS(), getDX());
if (getAL() == 0x00)
{
/* Get the attributes */
Attributes = GetFileAttributesA(FileName);
/* Check if it failed */
if (Attributes == INVALID_FILE_ATTRIBUTES)
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(GetLastError());
}
else
{
/* Return the attributes that DOS can understand */
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
setCX(Attributes & 0x00FF);
}
}
else if (getAL() == 0x01)
{
/* Try to set the attributes */
if (SetFileAttributesA(FileName, getCL()))
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(GetLastError());
}
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(ERROR_INVALID_FUNCTION);
}
break;
}
/* IOCTL */
case 0x44:
{
WORD Length = getCX();
if (DosDeviceIoControl(getBX(), getAL(), MAKELONG(getDX(), getDS()), &Length))
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
setAX(Length);
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(Sda->LastErrorCode);
}
break;
}
/* Duplicate Handle */
case 0x45:
{
WORD NewHandle = DosDuplicateHandle(getBX());
if (NewHandle != INVALID_DOS_HANDLE)
{
setAX(NewHandle);
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(Sda->LastErrorCode);
}
break;
}
/* Force Duplicate Handle */
case 0x46:
{
if (DosForceDuplicateHandle(getBX(), getCX()))
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(ERROR_INVALID_HANDLE);
}
break;
}
/* Get Current Directory */
case 0x47:
{
BYTE DriveNumber = getDL();
String = (PCHAR)SEG_OFF_TO_PTR(getDS(), getSI());
/* Get the real drive number */
if (DriveNumber == 0)
{
DriveNumber = Sda->CurrentDrive;
}
else
{
/* Decrement DriveNumber since it was 1-based */
DriveNumber--;
}
if (DriveNumber < SysVars->NumLocalDrives)
{
/*
* Copy the current directory into the target buffer.
* It doesn't contain the drive letter and the backslash.
*/
strncpy(String, DosData->CurrentDirectories[DriveNumber], DOS_DIR_LENGTH);
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
setAX(0x0100); // Undocumented, see Ralf Brown: http://www.ctyme.com/intr/rb-2933.htm
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(ERROR_INVALID_DRIVE);
}
break;
}
/* Allocate Memory */
case 0x48:
{
WORD MaxAvailable = 0;
WORD Segment = DosAllocateMemory(getBX(), &MaxAvailable);
if (Segment != 0)
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
setAX(Segment);
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(Sda->LastErrorCode);
setBX(MaxAvailable);
}
break;
}
/* Free Memory */
case 0x49:
{
if (DosFreeMemory(getES()))
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(Sda->LastErrorCode);
}
break;
}
/* Resize Memory Block */
case 0x4A:
{
WORD Size;
if (DosResizeMemory(getES(), getBX(), &Size))
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(Sda->LastErrorCode);
setBX(Size);
}
break;
}
/* Execute */
case 0x4B:
{
BYTE OrgAL = getAL();
LPSTR ProgramName = SEG_OFF_TO_PTR(getDS(), getDX());
PDOS_EXEC_PARAM_BLOCK ParamBlock = SEG_OFF_TO_PTR(getES(), getBX());
WORD ErrorCode;
if (OrgAL <= DOS_LOAD_OVERLAY)
{
DOS_EXEC_TYPE LoadType = (DOS_EXEC_TYPE)OrgAL;
if (LoadType == DOS_LOAD_AND_EXECUTE)
{
/* Create a new process */
ErrorCode = DosCreateProcess(ProgramName,
ParamBlock,
MAKELONG(Stack[STACK_IP], Stack[STACK_CS]));
}
else
{
/* Just load an executable */
ErrorCode = DosLoadExecutable(LoadType,
ProgramName,
ParamBlock,
NULL,
NULL,
MAKELONG(Stack[STACK_IP], Stack[STACK_CS]));
}
}
else if (OrgAL == 0x05)
{
// http://www.ctyme.com/intr/rb-2942.htm
DPRINT1("Set execution state is UNIMPLEMENTED\n");
ErrorCode = ERROR_CALL_NOT_IMPLEMENTED;
}
else
{
ErrorCode = ERROR_INVALID_FUNCTION;
}
if (ErrorCode == ERROR_SUCCESS)
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(ErrorCode);
}
break;
}
/* Terminate with Return Code */
case 0x4C:
{
DosTerminateProcess(Sda->CurrentPsp, getAL(), 0);
break;
}
/* Get Return Code (ERRORLEVEL) */
case 0x4D:
{
/*
* According to Ralf Brown: http://www.ctyme.com/intr/rb-2976.htm
* DosErrorLevel is cleared after being read by this function.
*/
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
setAX(Sda->ErrorLevel);
Sda->ErrorLevel = 0x0000; // Clear it
break;
}
/* Find First File */
case 0x4E:
{
WORD Result = (WORD)demFileFindFirst(FAR_POINTER(Sda->DiskTransferArea),
SEG_OFF_TO_PTR(getDS(), getDX()),
getCX());
setAX(Result);
if (Result == ERROR_SUCCESS)
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
else
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
break;
}
/* Find Next File */
case 0x4F:
{
WORD Result = (WORD)demFileFindNext(FAR_POINTER(Sda->DiskTransferArea));
setAX(Result);
if (Result == ERROR_SUCCESS)
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
else
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
break;
}
/* Internal - Set Current Process ID (Set PSP Address) */
case 0x50:
{
DosSetProcessContext(getBX());
break;
}
/* Internal - Get Current Process ID (Get PSP Address) */
case 0x51:
/* Get Current PSP Address */
case 0x62:
{
/*
* Undocumented AH=51h is identical to the documented AH=62h.
* See Ralf Brown: http://www.ctyme.com/intr/rb-2982.htm
* and http://www.ctyme.com/intr/rb-3140.htm
* for more information.
*/
setBX(Sda->CurrentPsp);
break;
}
/* Internal - Get "List of lists" (SYSVARS) */
case 0x52:
{
/*
* On return, ES points at the DOS data segment (see also INT 2F/AX=1203h).
* See Ralf Brown: http://www.ctyme.com/intr/rb-2983.htm
* for more information.
*/
/* Return the DOS "list of lists" in ES:BX */
setES(DOS_DATA_SEGMENT);
setBX(DOS_DATA_OFFSET(SysVars.FirstDpb));
break;
}
/* Create Child PSP */
case 0x55:
{
DosCreatePsp(getDX(), getSI());
DosSetProcessContext(getDX());
break;
}
/* Rename File */
case 0x56:
{
LPSTR ExistingFileName = (LPSTR)SEG_OFF_TO_PTR(getDS(), getDX());
LPSTR NewFileName = (LPSTR)SEG_OFF_TO_PTR(getES(), getDI());
/*
* See Ralf Brown: http://www.ctyme.com/intr/rb-2990.htm
* for more information.
*/
if (MoveFileA(ExistingFileName, NewFileName))
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(GetLastError());
}
break;
}
/* File Attributes */
case 0x57:
{
switch (getAL())
{
/* Get File's last-written Date and Time */
case 0x00:
{
PDOS_FILE_DESCRIPTOR Descriptor = DosGetHandleFileDescriptor(getBX());
FILETIME LastWriteTime;
WORD FileDate, FileTime;
if (Descriptor == NULL)
{
/* Invalid handle */
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
// Sda->LastErrorCode = ERROR_INVALID_HANDLE;
setAX(ERROR_INVALID_HANDLE);
break;
}
if (Descriptor->DeviceInfo & FILE_INFO_DEVICE)
{
/* Invalid for devices */
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
// setAX(ERROR_INVALID_FUNCTION);
setAX(ERROR_INVALID_HANDLE);
break;
}
/*
* Retrieve the last-written Win32 date and time,
* and convert it to DOS format.
*/
if (!GetFileTime(Descriptor->Win32Handle,
NULL, NULL, &LastWriteTime) ||
!FileTimeToDosDateTime(&LastWriteTime,
&FileDate, &FileTime))
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(GetLastError());
break;
}
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
setCX(FileTime);
setDX(FileDate);
break;
}
/* Set File's last-written Date and Time */
case 0x01:
{
PDOS_FILE_DESCRIPTOR Descriptor = DosGetHandleFileDescriptor(getBX());
FILETIME LastWriteTime;
WORD FileDate = getDX();
WORD FileTime = getCX();
if (Descriptor == NULL)
{
/* Invalid handle */
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
// Sda->LastErrorCode = ERROR_INVALID_HANDLE;
setAX(ERROR_INVALID_HANDLE);
break;
}
if (Descriptor->DeviceInfo & FILE_INFO_DEVICE)
{
/* Invalid for devices */
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
// setAX(ERROR_INVALID_FUNCTION);
setAX(ERROR_INVALID_HANDLE);
break;
}
/*
* Convert the new last-written DOS date and time
* to Win32 format and set it.
*/
if (!DosDateTimeToFileTime(FileDate, FileTime,
&LastWriteTime) ||
!SetFileTime(Descriptor->Win32Handle,
NULL, NULL, &LastWriteTime))
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(GetLastError());
break;
}
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
break;
}
default: // goto Default;
{
DPRINT1("INT 21h, AH = %02Xh, subfunction AL = %02Xh NOT IMPLEMENTED\n",
getAH(), getAL());
}
}
break;
}
/* Get/Set Memory Management Options */
case 0x58:
{
switch (getAL())
{
/* Get allocation strategy */
case 0x00:
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
setAX(Sda->AllocStrategy);
break;
}
/* Set allocation strategy */
case 0x01:
{
if ((getBL() & (DOS_ALLOC_HIGH | DOS_ALLOC_HIGH_LOW))
== (DOS_ALLOC_HIGH | DOS_ALLOC_HIGH_LOW))
{
/* Can't set both */
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(ERROR_INVALID_PARAMETER);
break;
}
if ((getBL() & ~(DOS_ALLOC_HIGH | DOS_ALLOC_HIGH_LOW))
> DOS_ALLOC_LAST_FIT)
{
/* Invalid allocation strategy */
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(ERROR_INVALID_PARAMETER);
break;
}
Sda->AllocStrategy = getBL();
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
break;
}
/* Get UMB link state */
case 0x02:
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
setAL(SysVars->UmbLinked ? 0x01 : 0x00);
break;
}
/* Set UMB link state */
case 0x03:
{
BOOLEAN Success;
if (getBX())
Success = DosLinkUmb();
else
Success = DosUnlinkUmb();
if (Success)
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
else
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
break;
}
/* Invalid or unsupported function */
default:
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(ERROR_INVALID_FUNCTION);
}
}
break;
}
/* Get Extended Error Information */
case 0x59:
{
DPRINT1("INT 21h, AH = 59h, BX = %04Xh - Get Extended Error Information is UNIMPLEMENTED\n",
getBX());
break;
}
/* Create Temporary File */
case 0x5A:
{
LPSTR PathName = (LPSTR)SEG_OFF_TO_PTR(getDS(), getDX());
LPSTR FileName = PathName; // The buffer for the path and the full file name is the same.
UINT uRetVal;
WORD FileHandle;
WORD ErrorCode;
/*
* See Ralf Brown: http://www.ctyme.com/intr/rb-3014.htm
* for more information.
*/
// FIXME: Check for buffer validity?
// It should be a ASCIIZ path ending with a '\' + 13 zero bytes
// to receive the generated filename.
/* First create the temporary file */
uRetVal = GetTempFileNameA(PathName, NULL, 0, FileName);
if (uRetVal == 0)
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(GetLastError());
break;
}
/* Now try to open it in read/write access */
ErrorCode = DosOpenFile(&FileHandle, FileName, 2);
if (ErrorCode == ERROR_SUCCESS)
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
setAX(FileHandle);
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(ErrorCode);
}
break;
}
/* Create New File */
case 0x5B:
{
WORD FileHandle;
WORD ErrorCode = DosCreateFile(&FileHandle,
(LPCSTR)SEG_OFF_TO_PTR(getDS(), getDX()),
CREATE_NEW,
getCX());
if (ErrorCode == ERROR_SUCCESS)
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
setAX(FileHandle);
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(ErrorCode);
}
break;
}
/* Lock/Unlock Region of File */
case 0x5C:
{
if (getAL() == 0x00)
{
/* Lock region of file */
if (DosLockFile(getBX(), MAKELONG(getDX(), getCX()), MAKELONG(getDI(), getSI())))
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(Sda->LastErrorCode);
}
}
else if (getAL() == 0x01)
{
/* Unlock region of file */
if (DosUnlockFile(getBX(), MAKELONG(getDX(), getCX()), MAKELONG(getDI(), getSI())))
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(Sda->LastErrorCode);
}
}
else
{
/* Invalid subfunction */
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(ERROR_INVALID_FUNCTION);
}
break;
}
/* Canonicalize File Name or Path */
case 0x60:
{
/*
* See Ralf Brown: http://www.ctyme.com/intr/rb-3137.htm
* for more information.
*/
/*
* We suppose that the DOS app gave to us a valid
* 128-byte long buffer for the canonicalized name.
*/
DWORD dwRetVal = GetFullPathNameA(SEG_OFF_TO_PTR(getDS(), getSI()),
128,
SEG_OFF_TO_PTR(getES(), getDI()),
NULL);
if (dwRetVal == 0)
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(GetLastError());
}
else
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
setAX(0x0000);
}
// FIXME: Convert the full path name into short version.
// We cannot reliably use GetShortPathName, because it fails
// if the path name given doesn't exist. However this DOS
// function AH=60h should be able to work even for non-existing
// path and file names.
break;
}
/* Miscellaneous Internal Functions */
case 0x5D:
{
switch (getAL())
{
/* Get Swappable Data Area */
case 0x06:
{
setDS(DOS_DATA_SEGMENT);
setSI(DOS_DATA_OFFSET(Sda.ErrorMode));
setCX(sizeof(DOS_SDA));
setDX(FIELD_OFFSET(DOS_SDA, LastAX));
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
break;
}
default: // goto Default;
{
DPRINT1("INT 21h, AH = %02Xh, subfunction AL = %02Xh NOT IMPLEMENTED\n",
getAH(), getAL());
}
}
break;
}
/* Extended Country Information */
case 0x65:
{
switch (getAL())
{
case 0x01: case 0x02: case 0x03:
case 0x04: case 0x05: case 0x06:
case 0x07:
{
WORD BufferSize = getCX();
WORD ErrorCode;
ErrorCode = DosGetCountryInfoEx(getAL(),
getBX(),
getDX(),
(PDOS_COUNTRY_INFO_2)SEG_OFF_TO_PTR(getES(), getDI()),
&BufferSize);
if (ErrorCode == ERROR_SUCCESS)
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
setCX(BufferSize);
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(ErrorCode);
}
break;
}
/* Country-dependent Character Capitalization -- Character */
case 0x20:
/* Country-dependent Filename Capitalization -- Character */
case 0xA0:
{
setDL(DosToUpper(getDL()));
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
// setAX(ERROR_SUCCESS);
break;
}
/* Country-dependent Character Capitalization -- Counted ASCII String */
case 0x21:
/* Country-dependent Filename Capitalization -- Counted ASCII String */
case 0xA1:
{
PCHAR Str = (PCHAR)SEG_OFF_TO_PTR(getDS(), getDX());
// FIXME: Check for NULL ptr!!
DosToUpperStrN(Str, Str, getCX());
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
// setAX(ERROR_SUCCESS);
break;
}
/* Country-dependent Character Capitalization -- ASCIIZ String */
case 0x22:
/* Country-dependent Filename Capitalization -- ASCIIZ String */
case 0xA2:
{
PSTR Str = (PSTR)SEG_OFF_TO_PTR(getDS(), getDX());
// FIXME: Check for NULL ptr!!
DosToUpperStrZ(Str, Str);
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
// setAX(ERROR_SUCCESS);
break;
}
/* Determine if Character represents YES/NO Response */
case 0x23:
{
setAX(DosIfCharYesNo(MAKEWORD(getDL(), getDH())));
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
break;
}
default: // goto Default;
{
DPRINT1("INT 21h, AH = %02Xh, subfunction AL = %02Xh NOT IMPLEMENTED\n",
getAH(), getAL());
}
}
break;
}
/* Set Handle Count */
case 0x67:
{
if (!DosResizeHandleTable(getBX()))
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(Sda->LastErrorCode);
}
else Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
break;
}
/* Commit File */
case 0x68:
case 0x6A:
{
/*
* Function 6Ah is identical to function 68h,
* and sets AH to 68h if success.
* See Ralf Brown: http://www.ctyme.com/intr/rb-3176.htm
* for more information.
*/
setAH(0x68);
if (DosFlushFileBuffers(getBX()))
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(GetLastError());
}
break;
}
/* Extended Open/Create */
case 0x6C:
{
WORD FileHandle;
WORD CreationStatus;
WORD ErrorCode;
/* Check for AL == 00 */
if (getAL() != 0x00)
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(ERROR_INVALID_FUNCTION);
break;
}
/*
* See Ralf Brown: http://www.ctyme.com/intr/rb-3179.htm
* for the full detailed description.
*
* WARNING: BH contains some extended flags that are NOT SUPPORTED.
*/
ErrorCode = DosCreateFileEx(&FileHandle,
&CreationStatus,
(LPCSTR)SEG_OFF_TO_PTR(getDS(), getSI()),
getBL(),
getDL(),
getCX());
if (ErrorCode == ERROR_SUCCESS)
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
setCX(CreationStatus);
setAX(FileHandle);
}
else
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
setAX(ErrorCode);
}
break;
}
/* Unsupported */
default: // Default:
{
DPRINT1("DOS Function INT 21h, AH = %02Xh, AL = %02Xh NOT IMPLEMENTED!\n",
getAH(), getAL());
setAL(0); // Some functions expect AL to be 0 when it's not supported.
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
}
}
Sda->InDos--;
}
VOID WINAPI DosBreakInterrupt(LPWORD Stack)
{
/* Set CF to terminate the running process */
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
}
VOID WINAPI DosAbsoluteRead(LPWORD Stack)
{
/*
* This call should leave the flags on the stack for some reason,
* so move the stack by one word.
* See: http://www.techhelpmanual.com/565-int_25h_26h__absolute_disk_read_write.html
*/
Stack[STACK_INT_NUM] = Stack[STACK_IP];
Stack[STACK_IP] = Stack[STACK_CS];
Stack[STACK_CS] = Stack[STACK_FLAGS];
setSP(LOWORD(getSP() - 2));
// TODO: NOT IMPLEMENTED;
UNIMPLEMENTED;
/* General failure */
setAX(0x800C);
Stack[STACK_FLAGS - 1] |= EMULATOR_FLAG_CF;
}
VOID WINAPI DosAbsoluteWrite(LPWORD Stack)
{
/*
* This call should leave the flags on the stack for some reason,
* so move the stack by one word.
* See: http://www.techhelpmanual.com/565-int_25h_26h__absolute_disk_read_write.html
*/
Stack[STACK_INT_NUM] = Stack[STACK_IP];
Stack[STACK_IP] = Stack[STACK_CS];
Stack[STACK_CS] = Stack[STACK_FLAGS];
setSP(LOWORD(getSP() - 2));
// TODO: NOT IMPLEMENTED;
UNIMPLEMENTED;
/* General failure */
setAX(0x800C);
Stack[STACK_FLAGS - 1] |= EMULATOR_FLAG_CF;
}
VOID WINAPI DosInt27h(LPWORD Stack)
{
WORD KeepResident = (getDX() + 0x0F) >> 4;
/* Terminate and Stay Resident. CS must be the PSP segment. */
DPRINT1("Process going resident: %u paragraphs kept\n", KeepResident);
DosTerminateProcess(Stack[STACK_CS], 0, KeepResident);
}
VOID WINAPI DosIdle(LPWORD Stack)
{
/*
* This will set the carry flag on the first call (to repeat the BOP),
* and clear it in the next, so that exactly one HLT occurs.
*/
setCF(!getCF());
}
VOID WINAPI DosFastConOut(LPWORD Stack)
{
/*
* This is the DOS 2+ Fast Console Output Interrupt.
* The default handler under DOS 2.x and 3.x simply calls INT 10h/AH=0Eh.
*
* See Ralf Brown: http://www.ctyme.com/intr/rb-4124.htm
* for more information.
*/
/* Save AX and BX */
USHORT AX = getAX();
USHORT BX = getBX();
/*
* Set the parameters:
* AL contains the character to print (already set),
* BL contains the character attribute,
* BH contains the video page to use.
*/
setBL(DOS_CHAR_ATTRIBUTE);
setBH(Bda->VideoPage);
/* Call the BIOS INT 10h, AH=0Eh "Teletype Output" */
setAH(0x0E);
Int32Call(&DosContext, BIOS_VIDEO_INTERRUPT);
/* Restore AX and BX */
setBX(BX);
setAX(AX);
}
VOID WINAPI DosInt2Ah(LPWORD Stack)
{
DPRINT1("INT 2Ah, AX=%4xh called\n", getAX());
}
VOID WINAPI DosInt2Fh(LPWORD Stack)
{
switch (getAH())
{
/* DOS 3+ Internal Utility Functions */
case 0x12:
{
DPRINT1("INT 2Fh, AX=%4xh DOS Internal Utility Function called\n", getAX());
switch (getAL())
{
/* Installation Check */
case 0x00:
{
setAL(0xFF);
break;
}
/* Get DOS Data Segment */
case 0x03:
{
setDS(DOS_DATA_SEGMENT);
break;
}
/* Compare FAR Pointers */
case 0x14:
{
PVOID PointerFromFarPointer1 = SEG_OFF_TO_PTR(getDS(), getSI());
PVOID PointerFromFarPointer2 = SEG_OFF_TO_PTR(getES(), getDI());
BOOLEAN AreEqual = (PointerFromFarPointer1 == PointerFromFarPointer2);
if (AreEqual)
{
Stack[STACK_FLAGS] |= EMULATOR_FLAG_ZF;
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_CF;
}
else
{
Stack[STACK_FLAGS] &= ~EMULATOR_FLAG_ZF;
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
}
break;
}
/* Set DOS Version Number to return */
case 0x2F:
{
WORD DosVersion = getDX();
// Special case: return the true DOS version when DX=00h
if (DosVersion == 0x0000)
DosData->DosVersion = DOS_VERSION;
else
DosData->DosVersion = DosVersion;
break;
}
}
break;
}
/* Set Disk Interrupt Handler */
case 0x13:
{
/* Save the old values of PrevInt13 and RomBiosInt13 */
ULONG OldInt13 = BiosData->PrevInt13;
ULONG OldBiosInt13 = BiosData->RomBiosInt13;
/* Set PrevInt13 and RomBiosInt13 to their new values */
BiosData->PrevInt13 = MAKELONG(getDX(), getDS());
BiosData->RomBiosInt13 = MAKELONG(getBX(), getES());
/* Return in DS:DX the old value of PrevInt13 */
setDS(HIWORD(OldInt13));
setDX(LOWORD(OldInt13));
/* Return in DS:DX the old value of RomBiosInt13 */
setES(HIWORD(OldBiosInt13));
setBX(LOWORD(OldBiosInt13));
break;
}
/* Mostly Windows 2.x/3.x/9x support */
case 0x16:
{
/*
* AL=80h is DOS/Windows/DPMI "Release Current Virtual Machine Time-slice"
* Just do nothing in this case.
*/
if (getAL() != 0x80) goto Default;
break;
}
/* Extended Memory Specification */
case 0x43:
{
DWORD DriverEntry;
if (!XmsGetDriverEntry(&DriverEntry)) break;
switch (getAL())
{
/* Installation Check */
case 0x00:
{
/* The driver is loaded */
setAL(0x80);
break;
}
/* Get Driver Address */
case 0x10:
{
setES(HIWORD(DriverEntry));
setBX(LOWORD(DriverEntry));
break;
}
default:
DPRINT1("Unknown DOS XMS Function: INT 2Fh, AH = 43h, AL = %02Xh\n", getAL());
break;
}
break;
}
default: Default:
{
DPRINT1("DOS Internal System Function INT 2Fh, AH = %02Xh, AL = %02Xh NOT IMPLEMENTED!\n",
getAH(), getAL());
Stack[STACK_FLAGS] |= EMULATOR_FLAG_CF;
}
}
}
BOOLEAN DosKRNLInitialize(VOID)
{
UCHAR i;
PDOS_SFT Sft;
LPSTR Path;
BOOLEAN Success = TRUE;
DWORD dwRet;
CHAR CurrentDirectory[MAX_PATH];
CHAR DosDirectory[DOS_DIR_LENGTH];
static const BYTE NullDriverRoutine[] =
{
/* Strategy routine entry */
0x26, // mov [Request.Status], DOS_DEVSTAT_DONE
0xC7,
0x47,
FIELD_OFFSET(DOS_REQUEST_HEADER, Status),
LOBYTE(DOS_DEVSTAT_DONE),
HIBYTE(DOS_DEVSTAT_DONE),
/* Interrupt routine entry */
0xCB, // retf
};
/* Set the data segment */
setDS(DOS_DATA_SEGMENT);
/* Initialize the global DOS data area */
DosData = (PDOS_DATA)SEG_OFF_TO_PTR(DOS_DATA_SEGMENT, 0x0000);
RtlZeroMemory(DosData, sizeof(*DosData));
/* Initialize the DOS stack */
setSS(DOS_DATA_SEGMENT);
setSP(DOS_DATA_OFFSET(DosStack) + sizeof(DosData->DosStack) - sizeof(WORD));
/* Initialize the list of lists */
SysVars = &DosData->SysVars;
RtlZeroMemory(SysVars, sizeof(*SysVars));
SysVars->FirstSft = MAKELONG(DOS_DATA_OFFSET(Sft), DOS_DATA_SEGMENT);
SysVars->CurrentDirs = MAKELONG(DOS_DATA_OFFSET(CurrentDirectories),
DOS_DATA_SEGMENT);
/*
* The last drive can be redefined with the LASTDRIVE command.
* At the moment, set the real maximum possible, 'Z'.
*/
SysVars->NumLocalDrives = 'Z' - 'A' + 1; // See #define NUM_DRIVES in dos.h
/* The boot drive is initialized to the %SYSTEMDRIVE% value */
// NOTE: Using the NtSystemRoot system variable might be OS-specific...
SysVars->BootDrive = RtlUpcaseUnicodeChar(SharedUserData->NtSystemRoot[0]) - 'A' + 1;
/* Initialize the NUL device driver */
SysVars->NullDevice.Link = 0xFFFFFFFF;
SysVars->NullDevice.DeviceAttributes = DOS_DEVATTR_NUL | DOS_DEVATTR_CHARACTER;
// Offset from within the DOS data segment
SysVars->NullDevice.StrategyRoutine = DOS_DATA_OFFSET(NullDriverRoutine);
// Hardcoded to the RETF inside StrategyRoutine
SysVars->NullDevice.InterruptRoutine = SysVars->NullDevice.StrategyRoutine + 6;
RtlFillMemory(SysVars->NullDevice.DeviceName,
sizeof(SysVars->NullDevice.DeviceName),
' ');
RtlCopyMemory(SysVars->NullDevice.DeviceName, "NUL", strlen("NUL"));
RtlCopyMemory(DosData->NullDriverRoutine,
NullDriverRoutine,
sizeof(NullDriverRoutine));
/* Default DOS version to report */
DosData->DosVersion = DOS_VERSION;
/* Initialize the swappable data area */
Sda = &DosData->Sda;
RtlZeroMemory(Sda, sizeof(*Sda));
/* Get the current directory and convert it to a DOS path */
dwRet = GetCurrentDirectoryA(sizeof(CurrentDirectory), CurrentDirectory);
if (dwRet == 0)
{
Success = FALSE;
DPRINT1("GetCurrentDirectoryA failed (Error: %u)\n", GetLastError());
}
else if (dwRet > sizeof(CurrentDirectory))
{
Success = FALSE;
DPRINT1("Current directory too long (%d > MAX_PATH) for GetCurrentDirectoryA\n", dwRet);
}
if (Success)
{
dwRet = GetShortPathNameA(CurrentDirectory, DosDirectory, sizeof(DosDirectory));
if (dwRet == 0)
{
Success = FALSE;
DPRINT1("GetShortPathNameA failed (Error: %u)\n", GetLastError());
}
else if (dwRet > sizeof(DosDirectory))
{
Success = FALSE;
DPRINT1("Short path too long (%d > DOS_DIR_LENGTH) for GetShortPathNameA\n", dwRet);
}
}
if (!Success)
{
/* We failed, use the boot drive instead */
DosDirectory[0] = SysVars->BootDrive + 'A' - 1;
DosDirectory[1] = ':';
DosDirectory[2] = '\\';
DosDirectory[3] = '\0';
}
/* Set the current drive */
Sda->CurrentDrive = RtlUpperChar(DosDirectory[0]) - 'A';
/* Get the directory part of the path and set the current directory */
Path = strchr(DosDirectory, '\\');
if (Path != NULL)
{
Path++; // Skip the backslash
strncpy(DosData->CurrentDirectories[Sda->CurrentDrive], Path, DOS_DIR_LENGTH);
}
else
{
DosData->CurrentDirectories[Sda->CurrentDrive][0] = '\0';
}
/* Set the current PSP to the system PSP */
Sda->CurrentPsp = SYSTEM_PSP;
/* Initialize the SFT */
Sft = (PDOS_SFT)FAR_POINTER(SysVars->FirstSft);
Sft->Link = 0xFFFFFFFF;
Sft->NumDescriptors = DOS_SFT_SIZE;
for (i = 0; i < Sft->NumDescriptors; i++)
{
/* Clear the file descriptor entry */
RtlZeroMemory(&Sft->FileDescriptors[i], sizeof(DOS_FILE_DESCRIPTOR));
}
/* Initialize memory management */
DosInitializeMemory();
/* Initialize the callback context */
InitializeContext(&DosContext, DOS_CODE_SEGMENT, 0x0000);
/* Register the DOS 32-bit Interrupts */
RegisterDosInt32(0x20, DosInt20h );
RegisterDosInt32(0x21, DosInt21h );
// RegisterDosInt32(0x22, DosInt22h ); // Termination
RegisterDosInt32(0x23, DosBreakInterrupt); // Ctrl-C / Ctrl-Break
// RegisterDosInt32(0x24, DosInt24h ); // Critical Error
RegisterDosInt32(0x25, DosAbsoluteRead ); // Absolute Disk Read
RegisterDosInt32(0x26, DosAbsoluteWrite ); // Absolute Disk Write
RegisterDosInt32(0x27, DosInt27h ); // Terminate and Stay Resident
RegisterDosInt32(0x28, DosIdle ); // DOS Idle Interrupt
RegisterDosInt32(0x29, DosFastConOut ); // DOS 2+ Fast Console Output
RegisterDosInt32(0x2F, DosInt2Fh ); // Multiplex Interrupt
/* Unimplemented DOS interrupts */
RegisterDosInt32(0x2A, DosInt2Ah); // DOS Critical Sections / Network
// RegisterDosInt32(0x2E, NULL); // COMMAND.COM "Reload Transient"
// COMMAND.COM adds support for INT 2Fh, AX=AE00h and AE01h "Installable Command - Installation Check & Execute"
// COMMAND.COM adds support for INT 2Fh, AX=5500h "COMMAND.COM Interface"
/* Reserved DOS interrupts */
RegisterDosInt32(0x2B, NULL);
RegisterDosInt32(0x2C, NULL);
RegisterDosInt32(0x2D, NULL);
/* Initialize country data */
DosCountryInitialize();
/* Load the CON driver */
ConDrvInitialize();
/* Load the XMS driver (HIMEM) */
XmsInitialize();
/* Load the EMS driver */
if (!EmsDrvInitialize(EMS_SEGMENT, EMS_TOTAL_PAGES))
{
DosDisplayMessage("Could not initialize EMS. EMS will not be available.\n"
"Page frame segment or number of EMS pages invalid.\n");
}
/* Finally initialize the UMBs */
DosInitializeUmb();
return TRUE;
}
/* EOF */
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