124 lines
1.7 KiB
C
124 lines
1.7 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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mpswint.c
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Abstract:
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This module implements the software interrupt handlers
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for x86 machines
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Author:
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John Vert (jvert) 2-Jan-1992
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Environment:
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Kernel mode only.
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Revision History:
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Forrest Foltz (forrestf) 23-Oct-2000
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Ported from ixswint.asm to ixswint.c
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--*/
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#include "halcmn.h"
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extern UCHAR HalpIRQLtoTPR[];
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//
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// Array used to look up the correct ICR command based on the requested
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// software interrupt
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//
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const
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ULONG
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HalpIcrCommandArray[3] = {
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0,
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APC_VECTOR | DELIVER_FIXED | ICR_SELF, // APC_LEVEL
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DPC_VECTOR | DELIVER_FIXED | ICR_SELF // DISPATCH_LEVEL
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};
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C_ASSERT(APC_LEVEL == 1);
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C_ASSERT(DISPATCH_LEVEL == 2);
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VOID
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FASTCALL
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HalRequestSoftwareInterrupt (
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IN KIRQL RequestIrql
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)
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/*++
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Routine Description:
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This routine is used to request a software interrupt of
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the system.
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Arguments:
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RequestIrql - Supplies the request IRQL value
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Return Value:
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None.
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--*/
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{
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ULONG icrCommand;
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ULONG flags;
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ASSERT(RequestIrql == APC_LEVEL || RequestIrql == DISPATCH_LEVEL);
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icrCommand = HalpIcrCommandArray[RequestIrql];
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flags = HalpDisableInterrupts();
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HalpStallWhileApicBusy();
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LOCAL_APIC(LU_INT_CMD_LOW) = icrCommand;
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HalpStallWhileApicBusy();
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HalpRestoreInterrupts(flags);
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}
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VOID
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HalClearSoftwareInterrupt (
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IN KIRQL RequestIrql
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)
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/*++
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Routine Description:
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This routine is used to clear a possible pending software interrupt.
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Support for this function is optional, and allows the kernel to
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reduce the number of spurious software interrupts it receives/
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Arguments:
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RequestIrql - Supplies the request IRQL value
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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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