164 lines
2.8 KiB
C
164 lines
2.8 KiB
C
/*++
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Copyright (c) 1994 Digital Equipment Corporation
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Module Name:
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iodmapio.c
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Abstract:
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This module contains the functions to map HAL-accessed I/O addresses
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on IOD-based systems.
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Author:
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Eric Rehm 26-Apr-1995
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Environment:
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Kernel mode
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Revision History:
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--*/
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#include "halp.h"
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#include "isaaddr.h"
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//
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// Define global data used to locate the EISA control space.
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//
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PVOID HalpEisaControlBase;
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PVOID HalpEisaIntAckBase;
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PVOID HalpPciIrQva;
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PVOID HalpPciImrQva;
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PVOID HalpCMOSRamBase;
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BOOLEAN
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HalpMapIoSpace (
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VOID
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)
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/*++
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Routine Description:
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This routine maps the HAL I/O space for an IOD-based system using
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the Quasi VA mechanism.
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Arguments:
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None.
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Return Value:
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If the initialization is successfully completed, than a value of TRUE
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is returned. Otherwise, a value of FALSE is returned.
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--*/
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{
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PVOID PciIoSpaceBase;
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//
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// Map base addresses in QVA space.
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//
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// PciIoSpaceBase = HAL_MAKE_QVA( IOD_PCI0_SPARSE_IO_PHYSICAL );
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//
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// IoSpace Base for PCI 0 is a bus address 0.
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//
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PciIoSpaceBase = HAL_MAKE_IOD_SPARSE_QVA( 0, 0 );
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HalpEisaControlBase = PciIoSpaceBase;
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// ecrfix - not needed? HalpEisaIntAckBase = HAL_MAKE_IOD_SPARSE_QVA(0, 0);
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//
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// Map CMOS RAM address.
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//
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HalpCMOSRamBase = (PVOID)((ULONG)PciIoSpaceBase + CMOS_ISA_PORT_ADDRESS);
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//
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// Map the real-time clock registers.
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//
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HalpRtcAddressPort = (PVOID)((ULONG)PciIoSpaceBase + RTC_ISA_ADDRESS_PORT);
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HalpRtcDataPort = (PVOID)((ULONG)PciIoSpaceBase + RTC_ISA_DATA_PORT);
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return TRUE;
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}
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ULONG
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HalpMapDebugPort(
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IN ULONG ComPort,
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OUT PULONG ReadQva,
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OUT PULONG WriteQva
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)
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/*++
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Routine Description:
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This routine maps the debug com port so that the kernel debugger
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may function - if called it is called very earlier in the boot sequence.
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Arguments:
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ComPort - Supplies the number of the com port to use as the debug port.
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ReadQva - Receives the QVA used to access the read registers of the debug
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port.
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WriteQva - Receives the QVA used to access the write registers of the
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debug port.
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Return Value:
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Returns the base bus address of the device used as the debug port.
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--*/
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{
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ULONG ComPortAddress;
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ULONG PortQva;
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//
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// Compute the port address, based on the desired com port.
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//
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switch( ComPort ){
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case 1:
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ComPortAddress = COM1_ISA_PORT_ADDRESS;
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break;
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case 2:
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default:
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ComPortAddress = COM2_ISA_PORT_ADDRESS;
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}
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//
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// COM ports are on PCI bus 0.
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// Return the QVAs for read and write access.
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//
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PortQva = (ULONG)HAL_MAKE_IOD_SPARSE_QVA( 0, 0 ) + ComPortAddress;
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*ReadQva = PortQva;
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*WriteQva = PortQva;
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return ComPortAddress;
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}
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