/*++

Copyright (c) 1993  Digital Equipment Corporation

Module Name:

    lxmapio.c

Abstract:

    This module contains the functions to map HAL-accessed I/O addresses
    on the Avanti system.

Author:

    Joe Notarangelo  25-Oct-1993

Environment:

    Kernel mode

Revision History:

    Wim Colgate      27-April-1995

        Renamed for LX3.


--*/

#include "halp.h"
#include "lx3.h"
#include "pflash.h"


//
// Define global data used to locate the EISA control space.
//
// The reason these names seem strange, is because they are legacy names.
//

PVOID HalpEisaControlBase;
PVOID HalpEisaIntAckBase;
PVOID HalpCMOSRamBase;


BOOLEAN
HalpMapIoSpace (
    VOID
    )

/*++

Routine Description:

    This routine maps the HAL I/O space for an Avanti
    system using the Quasi VA.

Arguments:

    None.

Return Value:

    If the initialization is successfully completed, than a value of TRUE
    is returned. Otherwise, a value of FALSE is returned.

--*/

{
    PVOID PciIoSpaceBase;

    //
    // Map base addresses in QVA space.
    //

    PciIoSpaceBase = HAL_MAKE_QVA( APECS_PCI_IO_BASE_PHYSICAL );

    HalpEisaControlBase = PciIoSpaceBase;
    HalpEisaIntAckBase = HAL_MAKE_QVA( APECS_PCI_INTACK_BASE_PHYSICAL );

    //
    // Map the real-time clock registers.
    //

    HalpRtcAddressPort = (PVOID)((ULONG)PciIoSpaceBase + RTC_ISA_ADDRESS_PORT);
    HalpRtcDataPort = (PVOID)((ULONG)PciIoSpaceBase + RTC_ISA_DATA_PORT);

    //
    // Set the base offset of the NVRAM location inside the FLASH ROM
    //

    HalpCMOSRamBase = (PVOID)NVRAM1_BASE;

    return TRUE;

}

ULONG
HalpMapDebugPort(
    IN ULONG ComPort,
    OUT PULONG ReadQva,
    OUT PULONG WriteQva
    )
/*++

Routine Description:

    This routine maps the debug com port so that the kernel debugger
    may function - if called it is called very earlier in the boot sequence.

Arguments:

    ComPort - Supplies the number of the com port to use as the debug port.

    ReadQva - Receives the QVA used to access the read registers of the debug
              port.

    WriteQva - Receives the QVA used to access the write registers of the
               debug port.

Return Value:

    Returns the base bus address of the device used as the debug port.

--*/
{
    ULONG ComPortAddress;
    ULONG PortQva;

    //
    // Compute the port address, based on the desired com port.
    //

    switch( ComPort ){

    case 1:

        ComPortAddress = COM1_ISA_PORT_ADDRESS;
	break;

    case 2:
    default:

        ComPortAddress = COM2_ISA_PORT_ADDRESS;

    }

    //
    // Return the QVAs for read and write access.
    //

    PortQva = (ULONG)HAL_MAKE_QVA(APECS_PCI_IO_BASE_PHYSICAL) + ComPortAddress;

    *ReadQva = PortQva;
    *WriteQva = PortQva;

    return ComPortAddress;

}