116 lines
2.1 KiB
C
116 lines
2.1 KiB
C
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/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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mpcsysint.c
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Abstract:
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This module implements the HAL routines to enable/disable system
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interrupts on an MPS system.
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Author:
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John Vert (jvert) 22-Jul-1991
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Revision History:
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Forrest Foltz (forrestf) 27-Oct-2000
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Ported from mcsysint.asm to mcsysint.c
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Revision History:
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--*/
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#include "halcmn.h"
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VOID
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HalEndSystemInterrupt (
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IN KIRQL NewIrql,
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IN ULONG Vector
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)
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/*++
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Routine Description:
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This routine is used to send an EOI to the local APIC.
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Arguments:
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NewIrql - the new irql to be set.
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Vector - Vector number of the interrupt
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Return Value:
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None.
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--*/
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{
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UNREFERENCED_PARAMETER(NewIrql);
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UNREFERENCED_PARAMETER(Vector);
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//
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// Send EOI to APIC local unit
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//
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LOCAL_APIC(LU_EOI) = 0;
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}
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BOOLEAN
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HalBeginSystemInterrupt (
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IN KIRQL Irql,
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IN ULONG Vector,
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OUT PKIRQL OldIrql
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)
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/*++
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Routine Description:
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This routine raises the IRQL to the level of the specified
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interrupt vector. It is called by the hardware interrupt
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handler before any other interrupt service routine code is
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executed. The CPU interrupt flag is set on exit.
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On APIC-based systems we do not need to check for spurious
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interrupts since they now have their own vector. We also
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no longer need to check whether or not the incoming priority
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is higher than the current priority that is guaranteed by
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the priority mechanism of the APIC.
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SO
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All BeginSystemInterrupt needs to do is set the APIC TPR
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appropriate for the IRQL, and return TRUE. Note that to
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use the APIC ISR priority we are not going issue EOI until
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EndSystemInterrupt is called.
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Arguments:
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Irql - Supplies the IRQL to raise to
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Vector - Supplies the vector of the interrupt to be
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handled
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OldIrql- Location to return OldIrql
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Return Value:
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TRUE - Interrupt successfully dismissed and Irql raised.
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This routine can not fail.
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--*/
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{
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KeRaiseIrql(Irql,OldIrql);
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HalpEnableInterrupts();
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return TRUE;
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}
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