80 lines
1.7 KiB
C
80 lines
1.7 KiB
C
/*++
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Copyright (c) 1991 Microsoft Corporation
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Module Name:
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ixinfo.c
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Abstract:
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Author:
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Ken Reneris (kenr) 08-Aug-1994
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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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#include "pcmp_nt.inc"
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extern ULONG HalpPerfInterruptHandler;
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static HANDLE HalpProcessId = NULL;
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#ifdef ALLOC_PRAGMA
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#pragma alloc_text(PAGE,HalpSetSystemInformation)
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#endif
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NTSTATUS
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HalpSetSystemInformation (
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IN HAL_SET_INFORMATION_CLASS InformationClass,
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IN ULONG BufferSize,
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IN PVOID Buffer
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)
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{
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PAGED_CODE();
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switch (InformationClass) {
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case HalProfileSourceInterruptHandler:
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//
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// Set ISR handler for PerfVector
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//
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if (!(HalpFeatureBits & HAL_PERF_EVENTS)) {
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return STATUS_UNSUCCESSFUL;
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}
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//
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// Accept the interrupt handler if no other process
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// has already hooked the interrupt or if we are in
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// the context of the process that already hooked it.
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//
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if (HalpProcessId == NULL) {
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HalpPerfInterruptHandler = *((PULONG) Buffer);
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if (HalpPerfInterruptHandler != 0) {
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HalpProcessId = PsGetCurrentProcessId();
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}
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} else if (HalpProcessId == PsGetCurrentProcessId()) {
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HalpPerfInterruptHandler = *((PULONG) Buffer);
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if (HalpPerfInterruptHandler == 0) {
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HalpProcessId = NULL;
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}
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} else {
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return STATUS_UNSUCCESSFUL;
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}
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return STATUS_SUCCESS;
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}
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return HaliSetSystemInformation (InformationClass, BufferSize, Buffer);
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}
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