mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-10 14:23:31 +01:00
109 lines
3.1 KiB
C
109 lines
3.1 KiB
C
|
/** @file
|
||
|
|
Provides calibrated delay and performance counter services.
|
||
|
|
|
||
|
|
Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
|
||
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
||
|
|
|
||
|
|
**/
|
||
|
|
|
||
|
|
#ifndef __TIMER_LIB__
|
||
|
|
#define __TIMER_LIB__
|
||
|
|
|
||
|
|
/**
|
||
|
|
Stalls the CPU for at least the given number of microseconds.
|
||
|
|
|
||
|
|
Stalls the CPU for the number of microseconds specified by MicroSeconds.
|
||
|
|
|
||
|
|
@param MicroSeconds The minimum number of microseconds to delay.
|
||
|
|
|
||
|
|
@return The value of MicroSeconds inputted.
|
||
|
|
|
||
|
|
**/
|
||
|
|
UINTN
|
||
|
|
EFIAPI
|
||
|
|
MicroSecondDelay (
|
||
|
|
IN UINTN MicroSeconds
|
||
|
|
);
|
||
|
|
|
||
|
|
/**
|
||
|
|
Stalls the CPU for at least the given number of nanoseconds.
|
||
|
|
|
||
|
|
Stalls the CPU for the number of nanoseconds specified by NanoSeconds.
|
||
|
|
|
||
|
|
@param NanoSeconds The minimum number of nanoseconds to delay.
|
||
|
|
|
||
|
|
@return The value of NanoSeconds inputted.
|
||
|
|
|
||
|
|
**/
|
||
|
|
UINTN
|
||
|
|
EFIAPI
|
||
|
|
NanoSecondDelay (
|
||
|
|
IN UINTN NanoSeconds
|
||
|
|
);
|
||
|
|
|
||
|
|
/**
|
||
|
|
Retrieves the current value of a 64-bit free running performance counter.
|
||
|
|
|
||
|
|
The counter can either count up by 1 or count down by 1. If the physical
|
||
|
|
performance counter counts by a larger increment, then the counter values
|
||
|
|
must be translated. The properties of the counter can be retrieved from
|
||
|
|
GetPerformanceCounterProperties().
|
||
|
|
|
||
|
|
@return The current value of the free running performance counter.
|
||
|
|
|
||
|
|
**/
|
||
|
|
UINT64
|
||
|
|
EFIAPI
|
||
|
|
GetPerformanceCounter (
|
||
|
|
VOID
|
||
|
|
);
|
||
|
|
|
||
|
|
/**
|
||
|
|
Retrieves the 64-bit frequency in Hz and the range of performance counter
|
||
|
|
values.
|
||
|
|
|
||
|
|
If StartValue is not NULL, then the value that the performance counter starts
|
||
|
|
with immediately after is it rolls over is returned in StartValue. If
|
||
|
|
EndValue is not NULL, then the value that the performance counter end with
|
||
|
|
immediately before it rolls over is returned in EndValue. The 64-bit
|
||
|
|
frequency of the performance counter in Hz is always returned. If StartValue
|
||
|
|
is less than EndValue, then the performance counter counts up. If StartValue
|
||
|
|
is greater than EndValue, then the performance counter counts down. For
|
||
|
|
example, a 64-bit free running counter that counts up would have a StartValue
|
||
|
|
of 0 and an EndValue of 0xFFFFFFFFFFFFFFFF. A 24-bit free running counter
|
||
|
|
that counts down would have a StartValue of 0xFFFFFF and an EndValue of 0.
|
||
|
|
|
||
|
|
@param StartValue The value the performance counter starts with when it
|
||
|
|
rolls over.
|
||
|
|
@param EndValue The value that the performance counter ends with before
|
||
|
|
it rolls over.
|
||
|
|
|
||
|
|
@return The frequency in Hz.
|
||
|
|
|
||
|
|
**/
|
||
|
|
UINT64
|
||
|
|
EFIAPI
|
||
|
|
GetPerformanceCounterProperties (
|
||
|
|
OUT UINT64 *StartValue, OPTIONAL
|
||
|
|
OUT UINT64 *EndValue OPTIONAL
|
||
|
|
);
|
||
|
|
|
||
|
|
/**
|
||
|
|
Converts elapsed ticks of performance counter to time in nanoseconds.
|
||
|
|
|
||
|
|
This function converts the elapsed ticks of running performance counter to
|
||
|
|
time value in unit of nanoseconds.
|
||
|
|
|
||
|
|
@param Ticks The number of elapsed ticks of running performance counter.
|
||
|
|
|
||
|
|
@return The elapsed time in nanoseconds.
|
||
|
|
|
||
|
|
**/
|
||
|
|
UINT64
|
||
|
|
EFIAPI
|
||
|
|
GetTimeInNanoSecond (
|
||
|
|
IN UINT64 Ticks
|
||
|
|
);
|
||
|
|
|
||
|
|
#endif
|