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/*++
Copyright (c) 1992 Digital Equipment Corporation
Module Name:
ebmapio.c
Abstract:
This maps I/O addresses used by the HAL on Low Cost Alpha (LCA) machines.
Author:
Wim Colgate (DEC) 26-Oct-1993
Originally taken from the Jensen hal code.
Environment:
Kernel mode
Revision History:
--*/
#include "halp.h"
#include "eb66def.h"
//
// Define global data used to locate the EISA control space.
//
PVOID HalpEisaControlBase;
PVOID HalpEisaIntAckBase;
PVOID HalpCMOSRamBase;
BOOLEAN
HalpMapIoSpace (
VOID
)
/*++
Routine Description:
This routine maps the HAL I/O space for a LCA based
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 the address spaces on the LCA4.
//
HalpLca4MapAddressSpaces();
//
// Map base addresses into QVA space.
//
PciIoSpaceBase = HAL_MAKE_QVA( HalpLca4PciIoPhysical() );
HalpEisaControlBase = PciIoSpaceBase;;
HalpEisaIntAckBase = HAL_MAKE_QVA( HalpLca4PciIntAckPhysical() );
HalpCMOSRamBase = (PVOID)((ULONG)PciIoSpaceBase + CMOS_ISA_PORT_ADDRESS);
//
// Map the real-time clock registers.
//
HalpRtcAddressPort = (PVOID)((ULONG)PciIoSpaceBase + RTC_ISA_ADDRESS_PORT);
HalpRtcDataPort = (PVOID)((ULONG)PciIoSpaceBase + RTC_ISA_DATA_PORT);
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;
}
//
// Map the address spaces on the LCA4.
//
HalpLca4MapAddressSpaces();
//
// Return the QVAs for read and write access.
//
PortQva = (ULONG)(HAL_MAKE_QVA(HalpLca4PciIoPhysical())) + ComPortAddress;
*ReadQva = PortQva;
*WriteQva = PortQva;
return ComPortAddress;
}
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