EDK2 doxygen online documents  Firmware Encoding Index 1
EDK2 doxygen online documents  Firmware Encoding Index

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Functions  
UINTN EFIAPI  MicroSecondDelay (IN UINTN MicroSeconds) 
UINTN EFIAPI  NanoSecondDelay (IN UINTN NanoSeconds) 
UINT64 EFIAPI  GetPerformanceCounter (VOID) 
UINT64 EFIAPI  GetPerformanceCounterProperties (OUT UINT64 *StartValue, OPTIONAL OUT UINT64 *EndValue OPTIONAL) 
UINT64 EFIAPI  GetTimeInNanoSecond (IN UINT64 Ticks) 
Provides calibrated delay and performance counter services.
Copyright (c) 2006  2011, Intel Corporation. All rights reserved.
This program and the accompanying materials are licensed and made available under the terms and conditions of the BSD License which accompanies this distribution. The full text of the license may be found at http://opensource.org/licenses/bsdlicense.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
Definition in file TimerLib.h.
UINT64 EFIAPI GetPerformanceCounter  (  VOID  ) 
Retrieves the current value of a 64bit 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().
Retrieves the current value of a 64bit free running performance counter.
Retrieves the current value of a 64bit 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().
Retrieves the current value of a 64bit free running performance counter.
Retrieves the current value of a 64bit 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().
Retrieves the current value of a 64bit 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().
Retrieves the current value of the 64bit free running TimeStamp counter.
The timestamp counter (as implemented in the P6 family, Pentium, Pentium M, Pentium 4, Intel Xeon, Intel Core Solo and Intel Core Duo processors and later processors) is a 64bit counter that is set to 0 following a RESET of the processor. Following a RESET, the counter increments even when the processor is halted by the HLT instruction or the external STPCLK# pin. Note that the assertion of the external DPSLP# pin may cause the timestamp counter to stop.
The properties of the counter can be retrieved by the GetPerformanceCounterProperties() function.
Definition at line 142 of file ArmArchTimerLib.c.
UINT64 EFIAPI GetPerformanceCounterProperties  (  OUT UINT64 *  StartValue, 
OPTIONAL OUT UINT64 *EndValue  OPTIONAL  
) 
Retrieves the 64bit 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 64bit 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 64bit free running counter that counts up would have a StartValue of 0 and an EndValue of 0xFFFFFFFFFFFFFFFF. A 24bit free running counter that counts down would have a StartValue of 0xFFFFFF and an EndValue of 0.
StartValue  The value the performance counter starts with when it rolls over. 
EndValue  The value that the performance counter ends with before it rolls over. 
Retrieves the 64bit frequency in Hz and the range of performance counter values.
If StartValue is not NULL, then the value that the performance counter starts with, 0x0, is returned in StartValue. If EndValue is not NULL, then the value that the performance counter end with, 0xFFFFFFFFFFFFFFFF, is returned in EndValue.
The 64bit frequency of the performance counter, in Hz, is always returned. To determine average processor clock frequency, Intel recommends the use of EMON logic to count processor core clocks over the period of time for which the average is required.
[out]  StartValue  Pointer to where the performance counter's starting value is saved, or NULL. 
[out]  EndValue  Pointer to where the performance counter's ending value is saved, or NULL. 
Definition at line 175 of file ArmArchTimerLib.c.
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.
Ticks  The number of elapsed ticks of running performance counter. 
Definition at line 260 of file X86TimerLib.c.
Stalls the CPU for at least the given number of microseconds.
Stalls the CPU for the number of microseconds specified by MicroSeconds.
MicroSeconds  The minimum number of microseconds to delay. 
Stalls the CPU for the number of microseconds specified by MicroSeconds.
MicroSeconds  The minimum number of microseconds to delay. 
Stalls the CPU for at least the given number of microseconds.
Stalls the CPU for the number of microseconds specified by MicroSeconds. The hardware timer is 32 bits. The maximum possible delay is (0xFFFFFFFF / TimerFrequencyMHz), i.e. ([32bits] / FreqInMHz) For example: +++++  TimerFrequency  MaxDelay  MaxDelay  MaxDelay   (MHz)  (us)  (s)  (min)  +++++  1  0xFFFFFFFF  4294  71.5   5  0x33333333  859  14.3   10  0x19999999  429  7.2   50  0x051EB851  86  1.4  +++++ If it becomes necessary to support higher delays, then consider using the real time clock.
During this delay, the cpu is not yielded to any other process, with one exception: events that are triggered off a timer and which execute at a higher TPL than this function. These events may call MicroSecondDelay (or NanoSecondDelay) to fulfil their own needs. Therefore, this function must be reentrant, as it may be interrupted and restarted.
MicroSeconds  The minimum number of microseconds to delay. 
Stalls the CPU for at least the given number of microseconds.
Stalls the CPU for the number of microseconds specified by MicroSeconds.
MicroSeconds  The minimum number of microseconds to delay. 
Stalls the CPU for at least the given number of microseconds.
This function wraps EsalStall function of Extended SAL Stall Services Class. It stalls the CPU for the number of microseconds specified by MicroSeconds.
MicroSeconds  The minimum number of microseconds to delay. 
Stalls the CPU for at least the given number of microseconds.
Stalls the CPU for the number of microseconds specified by MicroSeconds.
MicroSeconds  The minimum number of microseconds to delay. 
Stalls the CPU for the number of microseconds specified by MicroSeconds.
MicroSeconds  The minimum number of microseconds to delay. 
Stalls the CPU for at least the given number of microseconds.
Stalls the CPU for the number of microseconds specified by MicroSeconds. The hardware timer is 32 bits. The maximum possible delay is (0xFFFFFFFF / TimerFrequencyMHz), i.e. ([32bits] / FreqInMHz) For example: +++++  TimerFrequency  MaxDelay  MaxDelay  MaxDelay   (MHz)  (us)  (s)  (min)  +++++  1  0xFFFFFFFF  4294  71.5   5  0x33333333  859  14.3   10  0x19999999  429  7.2   50  0x051EB851  86  1.4  +++++ If it becomes necessary to support higher delays, then consider using the real time clock.
During this delay, the cpu is not yielded to any other process, with one exception: events that are triggered off a timer and which execute at a higher TPL than this function. These events may call MicroSecondDelay (or NanoSecondDelay) to fulfil their own needs. Therefore, this function must be reentrant, as it may be interrupted and restarted.
MicroSeconds  The minimum number of microseconds to delay. 
Stalls the CPU for at least the given number of microseconds.
Stalls the CPU for the number of microseconds specified by MicroSeconds.
MicroSeconds  The minimum number of microseconds to delay. 
Stalls the CPU for at least the given number of microseconds.
This function wraps EsalStall function of Extended SAL Stall Services Class. It stalls the CPU for the number of microseconds specified by MicroSeconds.
MicroSeconds  The minimum number of microseconds to delay. 
Stalls the CPU for at least the specified number of MicroSeconds.
[in]  MicroSeconds  The minimum number of microseconds to delay. 
Definition at line 75 of file ArmArchTimerLib.c.
Stalls the CPU for at least the given number of nanoseconds.
Stalls the CPU for the number of nanoseconds specified by NanoSeconds.
NanoSeconds  The minimum number of nanoseconds to delay. 
Stalls the CPU for at least the given number of nanoseconds.
Stalls the CPU for the number of nanoseconds specified by NanoSeconds.
When the timer frequency is 1MHz, each tick corresponds to 1 microsecond. Therefore, the nanosecond delay will be rounded up to the nearest 1 microsecond.
NanoSeconds  The minimum number of nanoseconds to delay. 
Stalls the CPU for at least the given number of nanoseconds.
Stalls the CPU for the number of nanoseconds specified by NanoSeconds.
NanoSeconds  The minimum number of nanoseconds to delay. 
Stalls the CPU for at least the given number of nanoseconds.
This function wraps EsalStall function of Extended SAL Stall Services Class. It stalls the CPU for the number of nanoseconds specified by NanoSeconds.
NanoSeconds  The minimum number of nanoseconds to delay. 
Stalls the CPU for at least the given number of nanoseconds.
Stalls the CPU for the number of nanoseconds specified by NanoSeconds.
NanoSeconds  The minimum number of nanoseconds to delay. 
Stalls the CPU for at least the given number of nanoseconds.
Stalls the CPU for the number of nanoseconds specified by NanoSeconds.
When the timer frequency is 1MHz, each tick corresponds to 1 microsecond. Therefore, the nanosecond delay will be rounded up to the nearest 1 microsecond.
NanoSeconds  The minimum number of nanoseconds to delay. 
Stalls the CPU for at least the given number of nanoseconds.
Stalls the CPU for the number of nanoseconds specified by NanoSeconds.
NanoSeconds  The minimum number of nanoseconds to delay. 
Stalls the CPU for at least the given number of nanoseconds.
This function wraps EsalStall function of Extended SAL Stall Services Class. It stalls the CPU for the number of nanoseconds specified by NanoSeconds.
NanoSeconds  The minimum number of nanoseconds to delay. 
Stalls the CPU for at least the specified number of NanoSeconds.
[in]  NanoSeconds  The minimum number of nanoseconds to delay. 
Definition at line 114 of file ArmArchTimerLib.c.