106 lines
2 KiB
C
106 lines
2 KiB
C
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/**
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*** Copyright (C) 1996-97 Intel Corporation. All rights reserved.
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***
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*** The information and source code contained herein is the exclusive
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*** property of Intel Corporation and may not be disclosed, examined
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*** or reproduced in whole or in part without explicit written authorization
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*** from the company.
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**/
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/*++
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Copyright (c) 1995 Intel Corporation
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Module Name:
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simperfc.c
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Abstract:
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This module implements the routines to support performance counters.
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Author:
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14-Apr-1995
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Environment:
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Kernel mode
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Revision History:
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--*/
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#include "halp.h"
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LARGE_INTEGER
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KeQueryPerformanceCounter (
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OUT PLARGE_INTEGER PerformanceFrequency OPTIONAL
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)
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/*++
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Routine Description:
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This routine returns current 64-bit performance counter and,
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optionally, the Performance Frequency.
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In the simulation environment, this support is not needed.
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However, the performance monitor of the architecture may be
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used to implement this feature.
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Arguments:
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PerformanceFrequency - optionally, supplies the address
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of a variable to receive the performance counter frequency.
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Return Value:
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Current value of the performance counter will be returned.
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--*/
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{
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LARGE_INTEGER Result;
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Result.QuadPart = __getReg(CV_IA64_ApITC);
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if (ARGUMENT_PRESENT(PerformanceFrequency)) {
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PerformanceFrequency->QuadPart = 10000000; // 100ns/10MHz clock
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}
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return Result;
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}
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VOID
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HalCalibratePerformanceCounter (
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IN volatile PLONG Number,
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IN ULONGLONG NewCount
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)
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/*++
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Routine Description:
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This routine resets the performance counter value for the current
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processor to zero. The reset is done such that the resulting value
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is closely synchronized with other processors in the configuration.
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In the simulation environment, the performance counter feature is
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not supported. This routine does nothing.
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Arguments:
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Number - Supplies a pointer to count of the number of processors in
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the configuration.
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Return Value:
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None.
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--*/
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{
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*Number = 0;
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return;
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}
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