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