79 lines
1.4 KiB
C
79 lines
1.4 KiB
C
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/*++
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Copyright (c) 1991 Microsoft Corporation
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Module Name:
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jxmapio.c
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Abstract:
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This module implements the mapping of HAL I/O space a MIPS R3000
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or R4000 Jazz system.
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Author:
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David N. Cutler (davec) 28-Apr-1991
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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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#define REAL_TIME_CLOCK_ADDRESS 0x71
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//
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// Define global data used to locate the EISA control space and the realtime
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// clock registers.
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//
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PVOID HalpEisaControlBase;
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PVOID HalpEisaMemoryBase;
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PVOID HalpRealTimeClockBase;
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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 a MIPS R3000 or R4000 Jazz
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system.
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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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// For ARCStation I, Eisa I/O Space can be accessed through KSEG1.
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// So, HalpEisaControlBase can be computed by ORing the base address
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// of KSEG1 with the base physical address of EISA I/O space.
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// HalpRealTimeClockBase can be computed in a similar manner.
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HalpEisaControlBase = (PVOID)(KSEG1_BASE | EISA_CONTROL_PHYSICAL_BASE);
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HalpEisaMemoryBase = (PVOID)(KSEG1_BASE | EISA_MEMORY_PHYSICAL_BASE);
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HalpRealTimeClockBase = (PVOID)(KSEG1_BASE | EISA_CONTROL_PHYSICAL_BASE | REAL_TIME_CLOCK_ADDRESS);
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return TRUE;
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}
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