128 lines
2.3 KiB
C
128 lines
2.3 KiB
C
|
/*++
|
||
|
|
|
||
|
|
Copyright (c) 2000 Microsoft Corporation
|
||
|
|
|
||
|
|
Module Name:
|
||
|
|
|
||
|
|
ixswint.c
|
||
|
|
|
||
|
|
Abstract:
|
||
|
|
|
||
|
|
This module implements the software interrupt handlers
|
||
|
|
for x86 machines
|
||
|
|
|
||
|
|
Author:
|
||
|
|
|
||
|
|
John Vert (jvert) 2-Jan-1992
|
||
|
|
|
||
|
|
Environment:
|
||
|
|
|
||
|
|
Kernel mode only.
|
||
|
|
|
||
|
|
Revision History:
|
||
|
|
|
||
|
|
Forrest Foltz (forrestf) 23-Oct-2000
|
||
|
|
Ported from ixswint.asm to ixswint.c
|
||
|
|
|
||
|
|
--*/
|
||
|
|
|
||
|
|
#include "halcmn.h"
|
||
|
|
|
||
|
|
VOID
|
||
|
|
HalRequestSoftwareInterrupt (
|
||
|
|
IN KIRQL RequestIrql
|
||
|
|
)
|
||
|
|
|
||
|
|
/*++
|
||
|
|
|
||
|
|
Routine Description:
|
||
|
|
|
||
|
|
This routine is used to request a software interrupt to the
|
||
|
|
system. Also, this routine checks to see if any software
|
||
|
|
interrupt should be generated.
|
||
|
|
The following condition will cause software interrupt to
|
||
|
|
be simulated:
|
||
|
|
any software interrupt which has higher priority than
|
||
|
|
current IRQL's is pending.
|
||
|
|
|
||
|
|
NOTE: This routine simulates software interrupt as long as
|
||
|
|
any pending SW interrupt level is higher than the current
|
||
|
|
IRQL, even when interrupts are disabled.
|
||
|
|
|
||
|
|
Arguments:
|
||
|
|
|
||
|
|
RequestIrql - Supplies the request IRQL value
|
||
|
|
|
||
|
|
Return Value:
|
||
|
|
|
||
|
|
None.
|
||
|
|
|
||
|
|
--*/
|
||
|
|
|
||
|
|
{
|
||
|
|
PHALP_SOFTWARE_INTERRUPT vector;
|
||
|
|
ULONG mask;
|
||
|
|
ULONG flags;
|
||
|
|
PKPCR pcr;
|
||
|
|
KIRQL highestPending;
|
||
|
|
|
||
|
|
mask = (1 << RequestIrql);
|
||
|
|
|
||
|
|
//
|
||
|
|
// Clear the interrupt flag, set the pending interrupt bit, dispatch any
|
||
|
|
// appropriate software interrupts and restore the interrupt flag.
|
||
|
|
//
|
||
|
|
|
||
|
|
flags = HalpDisableInterrupts();
|
||
|
|
|
||
|
|
pcr = KeGetPcr();
|
||
|
|
pcr->Irr |= mask;
|
||
|
|
mask = (pcr->Irr) & ((1 << DISPATCH_LEVEL) - 1);
|
||
|
|
highestPending = SWInterruptLookupTable[mask];
|
||
|
|
|
||
|
|
if (highestPending > pcr->Irql) {
|
||
|
|
vector = HalpSoftwareInterruptTable[RequestIrql];
|
||
|
|
vector();
|
||
|
|
}
|
||
|
|
|
||
|
|
HalpRestoreInterrupts(flags);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
VOID
|
||
|
|
HalClearSoftwareInterrupt (
|
||
|
|
IN KIRQL RequestIrql
|
||
|
|
)
|
||
|
|
|
||
|
|
/*++
|
||
|
|
|
||
|
|
Routine Description:
|
||
|
|
|
||
|
|
This routine is used to clear a possible pending software interrupt.
|
||
|
|
Support for this function is optional, and allows the kernel to
|
||
|
|
reduce the number of spurious software interrupts it receives.
|
||
|
|
|
||
|
|
Arguments:
|
||
|
|
|
||
|
|
RequestIrql - Supplies the request IRQL value
|
||
|
|
|
||
|
|
Return Value:
|
||
|
|
|
||
|
|
None.
|
||
|
|
|
||
|
|
--*/
|
||
|
|
|
||
|
|
{
|
||
|
|
ULONG mask;
|
||
|
|
ULONG irr;
|
||
|
|
|
||
|
|
mask = ~(1 << RequestIrql);
|
||
|
|
|
||
|
|
KPCR_READ_FIELD(Irr,&irr);
|
||
|
|
irr &= mask;
|
||
|
|
KPCR_WRITE_FIELD(Irr,&irr);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|