200 lines
2.9 KiB
C
200 lines
2.9 KiB
C
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/*++
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Copyright (c) 1993 Microsoft Corporation
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Copyright (c) 1998 Intel Corporation
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Module Name:
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intsupc.c
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Abstract:
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This module implements ruotines for interrupt support.
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Author:
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Bernard Lint 5-May-1998
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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 "ki.h"
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VOID
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KiLowerIrqlSpecial(KIRQL);
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VOID
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KiDispatchSoftwareInterrupt (
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KIRQL Irql
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)
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/*++
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Routine Description:
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Dispatch pending software interrupt
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Arguments:
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Irql (a0) - Software interrupt to dispatch
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Return Value:
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None.
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Notes:
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Interrupts disabled on entry/return.
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The function is only called by KiCheckForSoftwareInterrupt that passes an
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Irql value of APC_LEVEL or DISPATCH_LEVEL.
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--*/
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{
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PKPRCB Prcb = KeGetCurrentPrcb();
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KiLowerIrqlSpecial(Irql); // set IRQL
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if (Irql == APC_LEVEL) {
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PCR->ApcInterrupt = 0;
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_enable();
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//
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// Dispatch APC Interrupt via direct call to KiDeliverApc
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//
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KiDeliverApc(KernelMode,NULL,NULL);
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_disable();
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} else {
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PCR->DispatchInterrupt = 0;
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_enable();
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//
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// Dispatch DPC Interrupt
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//
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KiDispatchInterrupt();
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_disable();
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}
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}
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VOID
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KiCheckForSoftwareInterrupt (
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KIRQL RequestIrql
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)
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/*++
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Routine Description:
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Check for and dispatch pending software interrupts
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Arguments:
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Irql (a0) - New, lower IRQL
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Return Value:
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None.
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Notes:
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Caller must check IRQL has dropped below s/w IRQL level
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--*/
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{
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BOOLEAN InterruptState;
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InterruptState = KeDisableInterrupts();
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if (RequestIrql == APC_LEVEL) {
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//
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// Dispatch only DPC requests
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//
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while (PCR->DispatchInterrupt) {
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KiDispatchSoftwareInterrupt(DISPATCH_LEVEL);
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}
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} else {
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//
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// Dispatch either APC or DPC
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//
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while (PCR->SoftwareInterruptPending) {
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KIRQL Irql;
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if (PCR->DispatchInterrupt) {
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Irql = DISPATCH_LEVEL;
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} else {
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Irql = APC_LEVEL;
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}
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KiDispatchSoftwareInterrupt(Irql);
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}
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}
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//
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// Lower IRQL to the requested level, restore interrupts and
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// return.
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//
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KiLowerIrqlSpecial(RequestIrql);
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KeEnableInterrupts(InterruptState);
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}
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VOID
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KiRequestSoftwareInterrupt (
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KIRQL RequestIrql
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)
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/*++
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Routine Description:
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This function requests a software interrupt at the specified IRQL
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level.
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Arguments:
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RequestIrql (a0) - 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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KIRQL Irql;
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#if DEBUG
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if ((RequestIrql < APC_LEVEL) || (RequestIrql > DISPATCH_LEVEL))
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KeBugCheckEx(INVALID_SOFTWARE_INTERRUPT, RequestIrql, 0, 0, 0);
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#endif
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((PUCHAR)&PCR->SoftwareInterruptPending)[RequestIrql-APC_LEVEL] = 1;
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Irql = KeGetCurrentIrql();
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if (Irql < RequestIrql) {
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KeLowerIrql (Irql);
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}
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}
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