mirror of
https://github.com/reactos/reactos.git
synced 2024-08-26 05:08:39 +00:00
151 lines
3.7 KiB
C
151 lines
3.7 KiB
C
/*
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* COPYRIGHT: GPL - See COPYING in the top level directory
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* PROJECT: ReactOS Virtual DOS Machine
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* FILE: subsystems/mvdm/ntvdm/dos/dos32krnl/condrv.c
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* PURPOSE: DOS32 CON Driver
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* PROGRAMMERS: Aleksandar Andrejevic <theflash AT sdf DOT lonestar DOT org>
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* Hermes Belusca-Maito (hermes.belusca@sfr.fr)
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*/
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/* INCLUDES *******************************************************************/
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#include "ntvdm.h"
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#define NDEBUG
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#include <debug.h>
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#include "emulator.h"
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#include "dos.h"
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#include "dos/dem.h"
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#include "bios/bios.h"
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/* PRIVATE VARIABLES **********************************************************/
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PDOS_DEVICE_NODE Con = NULL;
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BYTE ExtendedCode = 0;
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/* PRIVATE FUNCTIONS **********************************************************/
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WORD NTAPI ConDrvReadInput(PDOS_DEVICE_NODE Device, DWORD Buffer, PWORD Length)
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{
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CHAR Character;
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WORD BytesRead = 0;
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PCHAR Pointer = (PCHAR)FAR_POINTER(Buffer);
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/* Save AX */
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USHORT AX = getAX();
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/*
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* Use BIOS Get Keystroke function
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*/
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while (BytesRead < *Length)
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{
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if (!ExtendedCode)
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{
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/* Call the BIOS INT 16h, AH=00h "Get Keystroke" */
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setAH(0x00);
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Int32Call(&DosContext, BIOS_KBD_INTERRUPT);
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/* Retrieve the character in AL (scan code is in AH) */
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Character = getAL();
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}
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else
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{
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/* Return the extended code */
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Character = ExtendedCode;
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/* And then clear it */
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ExtendedCode = 0;
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}
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/* Check if this is a special character */
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if (Character == 0) ExtendedCode = getAH();
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Pointer[BytesRead++] = Character;
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/* Stop on first carriage return */
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if (Character == '\r') break;
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}
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*Length = BytesRead;
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/* Restore AX */
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setAX(AX);
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return DOS_DEVSTAT_DONE;
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}
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WORD NTAPI ConDrvInputStatus(PDOS_DEVICE_NODE Device)
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{
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/* Save AX */
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USHORT AX = getAX();
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/* Call the BIOS */
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setAH(0x01); // or 0x11 for enhanced, but what to choose?
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Int32Call(&DosContext, BIOS_KBD_INTERRUPT);
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/* Restore AX */
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setAX(AX);
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/* If ZF is set, set the busy bit */
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if (getZF() && !ExtendedCode) return DOS_DEVSTAT_BUSY;
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else return DOS_DEVSTAT_DONE;
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}
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WORD NTAPI ConDrvWriteOutput(PDOS_DEVICE_NODE Device, DWORD Buffer, PWORD Length)
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{
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WORD BytesWritten;
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PCHAR Pointer = (PCHAR)FAR_POINTER(Buffer);
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/* Save AX */
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USHORT AX = getAX();
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for (BytesWritten = 0; BytesWritten < *Length; BytesWritten++)
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{
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/* Set the character */
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setAL(Pointer[BytesWritten]);
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/* Call the BIOS INT 29h "Fast Console Output" function */
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Int32Call(&DosContext, 0x29);
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}
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/* Restore AX */
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setAX(AX);
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return DOS_DEVSTAT_DONE;
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}
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WORD NTAPI ConDrvOpen(PDOS_DEVICE_NODE Device)
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{
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DPRINT("Handle to %Z opened\n", &Device->Name);
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return DOS_DEVSTAT_DONE;
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}
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WORD NTAPI ConDrvClose(PDOS_DEVICE_NODE Device)
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{
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DPRINT("Handle to %Z closed\n", &Device->Name);
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return DOS_DEVSTAT_DONE;
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}
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/* PUBLIC FUNCTIONS ***********************************************************/
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VOID ConDrvInitialize(VOID)
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{
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Con = DosCreateDevice(DOS_DEVATTR_STDIN
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| DOS_DEVATTR_STDOUT
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| DOS_DEVATTR_CON
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| DOS_DEVATTR_CHARACTER,
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"CON");
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Con->ReadRoutine = ConDrvReadInput;
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Con->InputStatusRoutine = ConDrvInputStatus;
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Con->WriteRoutine = ConDrvWriteOutput;
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Con->OpenRoutine = ConDrvOpen;
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Con->CloseRoutine = ConDrvClose;
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}
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VOID ConDrvCleanup(VOID)
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{
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if (Con) DosDeleteDevice(Con);
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}
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