/*++

Copyright (c) Microsoft Corporation.  All rights reserved.

Module Name:

    kdcom.h

Abstract:

    Contains constants used when interacting with 16550-based serial ports.

Author:

    Bryan M. Willman (bryanwi) 24-Sep-1990

Revision History:

    John Vert (jvert) 19-Jul-1991
        Moved into HAL

--*/

#pragma once

#define COM1_PORT   0x03F8
#define COM2_PORT   0x02F8
#define COM3_PORT   0x03E8
#define COM4_PORT   0x02E8

#define COM_DAT     0x00
#define COM_IEN     0x01        // interrupt enable register
#define COM_FCR     0x02        // fifo control register
#define COM_LCR     0x03        // line control register
#define COM_MCR     0x04        // modem control register
#define COM_LSR     0x05        // line status register
#define COM_MSR     0x06        // modem status register
#define COM_SCR     0x07        // scratch register
#define COM_DLL     0x00        // divisor latch least sig
#define COM_DLM     0x01        // divisor latch most sig

#define COM_BI      0x10        // Break detect
#define COM_FE      0x08        // Framing error
#define COM_PE      0x04        // Parity error
#define COM_OE      0x02        // Overrun error

#define LC_DLAB     0x80        // LCR divisor latch access bit

#define CLOCK_RATE  115200      // Hardware base clock frequency

#define MC_DTRRTS   0x03        // Control bits to assert DTR and RTS
#define MS_DSRCTSCD 0xB0        // Status bits for DSR, CTS and CD
#define MS_CD       0x80        // MSR bit to indicate carrier detect

#define FC_ENABLE   0x01        // FCR control bit to enable the FIFO
#define FC_CLEAR_RECEIVE 0x02   // FCR control bit to clear receive FIFO
#define FC_CLEAR_TRANSMIT 0x04  // FCR control bit to clear transmit FIFO

#define COM_OUTRDY  0x20        // LSR bit to indicate transmitter is empty
#define COM_DATRDY  0x01        // LSR bit to indicate data is available

#define BD_150      150
#define BD_300      300
#define BD_600      600
#define BD_1200     1200
#define BD_2400     2400
#define BD_4800     4800
#define BD_9600     9600
#define BD_14400    14400
#define BD_19200    19200
#define BD_56000    56000
#define BD_57600    57600
#define BD_115200   115200

//
// This bit controls the loopback testing mode of the device.  Basically
// the outputs are connected to the inputs (and vice versa).
//

#define SERIAL_MCR_LOOP     0x10

//
// These bits are used for general purpose output within the MCR.
//

#define SERIAL_MCR_OUT1     0x04
#define SERIAL_MCR_OUT2     0x08

//
// This bit contains the (complemented) state of the clear to send
// (CTS) line.
//

#define SERIAL_MSR_CTS      0x10

//
// This bit contains the (complemented) state of the data set ready
// (DSR) line.
//

#define SERIAL_MSR_DSR      0x20

//
// This bit contains the (complemented) state of the ring indicator
// (RI) line.
//

#define SERIAL_MSR_RI       0x40

//
// This bit contains the (complemented) state of the data carrier detect
// (DCD) line.
//

#define SERIAL_MSR_DCD      0x80

#define SERIAL_LSR_NOT_PRESENT  0xff