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/*++
Copyright (c) 1994 Digital Equipment Corporation
Module Name:
iodmapio.c
Abstract:
This module contains the functions to map HAL-accessed I/O addresses
on IOD-based systems.
Author:
Eric Rehm 26-Apr-1995
Environment:
Kernel mode
Revision History:
--*/
#include "halp.h"
#include "isaaddr.h"
//
// Define global data used to locate the EISA control space.
//
PVOID HalpEisaControlBase;
PVOID HalpEisaIntAckBase;
PVOID HalpPciIrQva;
PVOID HalpPciImrQva;
PVOID HalpCMOSRamBase;
BOOLEAN
HalpMapIoSpace (
VOID
)
/*++
Routine Description:
This routine maps the HAL I/O space for an IOD-based system using
the Quasi VA mechanism.
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( IOD_PCI0_SPARSE_IO_PHYSICAL );
//
// IoSpace Base for PCI 0 is a bus address 0.
//
PciIoSpaceBase = HAL_MAKE_IOD_SPARSE_QVA( 0, 0 );
HalpEisaControlBase = PciIoSpaceBase;
// ecrfix - not needed? HalpEisaIntAckBase = HAL_MAKE_IOD_SPARSE_QVA(0, 0);
//
// Map CMOS RAM address.
//
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;
}
//
// COM ports are on PCI bus 0.
// Return the QVAs for read and write access.
//
PortQva = (ULONG)HAL_MAKE_IOD_SPARSE_QVA( 0, 0 ) + ComPortAddress;
*ReadQva = PortQva;
*WriteQva = PortQva;
return ComPortAddress;
}
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