159 lines
3.3 KiB
C
159 lines
3.3 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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xxinitnt.c
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Abstract:
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This module implements the interrupt initialization for a MIPS R3000
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or R4000 system.
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Author:
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David N. Cutler (davec) 26-Apr-1991
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Environment:
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Kernel mode only.
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Revision History:
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--*/
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#include "halp.h"
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//
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// Define the IRQL mask and level mapping table.
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//
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// These tables are transfered to the PCR and determine the priority of
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// interrupts.
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//
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// N.B. The two software interrupt levels MUST be the lowest levels.
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//
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UCHAR HalpIrqlMask[] = {4, 5, 6, 6, 7, 7, 7, 7, // 0000 - 0111 high 4-bits
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8, 8, 8, 8, 8, 8, 8, 8, // 1000 - 1111 high 4-bits
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0, 1, 2, 2, 3, 3, 3, 3, // 0000 - 0111 low 4-bits
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4, 4, 4, 4, 4, 4, 4, 4}; // 1000 - 1111 low 4-bits
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UCHAR HalpIrqlTable[] = {0xff, // IRQL 0
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0xfe, // IRQL 1
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0xfc, // IRQL 2
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0xf8, // IRQL 3
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0xf0, // IRQL 4
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0xe0, // IRQL 5
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0xc0, // IRQL 6
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0x80, // IRQL 7
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0x00}; // IRQL 8
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#if defined(R4000)
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VOID
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HalpCountInterrupt (
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VOID
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)
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/*++
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Routine Description:
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This function serves as the R4000 count/compare interrupt service
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routine early in the system initialization. Its only function is
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to field and acknowledge count/compare interrupts during the system
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boot process.
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Arguments:
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None.
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Return Value:
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None.
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--*/
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{
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//
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// Acknowledge the R4000 count/compare interrupt.
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//
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HalpWriteCompareRegisterAndClear(DEFAULT_PROFILE_COUNT);
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return;
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}
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#endif
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BOOLEAN
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HalpInitializeInterrupts (
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VOID
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)
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/*++
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Routine Description:
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This function initializes interrupts for a MIPS R3000 or R4000 system.
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Arguments:
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None.
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Return Value:
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A value of TRUE is returned if the initialization is successfully
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completed. Otherwise a value of FALSE is returned.
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--*/
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{
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ULONG Index;
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PKPRCB Prcb;
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//
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// Get the address of the processor control block for the current
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// processor.
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//
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Prcb = PCR->Prcb;
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//
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// Initialize the IRQL translation tables in the PCR. These tables are
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// used by the interrupt dispatcher to determine the new IRQL and the
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// mask value that is to be loaded into the PSR. They are also used by
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// the routines that raise and lower IRQL to load a new mask value into
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// the PSR.
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//
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for (Index = 0; Index < sizeof(HalpIrqlMask); Index += 1) {
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PCR->IrqlMask[Index] = HalpIrqlMask[Index];
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}
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for (Index = 0; Index < sizeof(HalpIrqlTable); Index += 1) {
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PCR->IrqlTable[Index] = HalpIrqlTable[Index];
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}
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//
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// Connect the clock interrupt to the stall interrupt routine.
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//
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PCR->InterruptRoutine[CLOCK2_LEVEL] = HalpStallInterrupt;
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//
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// Connect the R4000 count/compare interrupt to the early interrupt
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// routine.
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//
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#if defined(R4000)
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PCR->InterruptRoutine[PROFILE_LEVEL] = HalpCountInterrupt;
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#endif
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return TRUE;
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}
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