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/*++
Copyright (c) 1991 Microsoft Corporation
Module Name:
jxmapio.c
Abstract:
This module implements the mapping of HAL I/O space a MIPS R3000
or R4000 Jazz system.
Author:
David N. Cutler (davec) 28-Apr-1991
Environment:
Kernel mode
Revision History:
--*/
#include "halp.h"
#define REAL_TIME_CLOCK_ADDRESS 0x71
//
// Define global data used to locate the EISA control space and the realtime
// clock registers.
//
PVOID HalpEisaControlBase;
PVOID HalpEisaMemoryBase;
PVOID HalpRealTimeClockBase;
BOOLEAN
HalpMapIoSpace (
VOID
)
/*++
Routine Description:
This routine maps the HAL I/O space for a MIPS R3000 or R4000 Jazz
system.
Arguments:
None.
Return Value:
If the initialization is successfully completed, than a value of TRUE
is returned. Otherwise, a value of FALSE is returned.
--*/
{
// For ARCStation I, Eisa I/O Space can be accessed through KSEG1.
// So, HalpEisaControlBase can be computed by ORing the base address
// of KSEG1 with the base physical address of EISA I/O space.
// HalpRealTimeClockBase can be computed in a similar manner.
HalpEisaControlBase = (PVOID)(KSEG1_BASE | EISA_CONTROL_PHYSICAL_BASE);
HalpEisaMemoryBase = (PVOID)(KSEG1_BASE | EISA_MEMORY_PHYSICAL_BASE);
HalpRealTimeClockBase = (PVOID)(KSEG1_BASE | EISA_CONTROL_PHYSICAL_BASE | REAL_TIME_CLOCK_ADDRESS);
return TRUE;
}
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