053e878bfb
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3737 Apply uncrustify changes to .c/.h files in the UefiCpuPkg package Cc: Andrew Fish <afish@apple.com> Cc: Leif Lindholm <leif@nuviainc.com> Cc: Michael D Kinney <michael.d.kinney@intel.com> Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com> Reviewed-by: Ray Ni <ray.ni@intel.com>
41 lines
985 B
C
41 lines
985 B
C
/** @file
|
|
CPUID Leaf 0x15 for Core Crystal Clock frequency instance as Base Timer Library.
|
|
|
|
Copyright (c) 2019 Intel Corporation. All rights reserved.<BR>
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
|
|
**/
|
|
|
|
#include <Base.h>
|
|
#include <Library/TimerLib.h>
|
|
#include <Library/BaseLib.h>
|
|
|
|
/**
|
|
CPUID Leaf 0x15 for Core Crystal Clock Frequency.
|
|
|
|
The TSC counting frequency is determined by using CPUID leaf 0x15. Frequency in MHz = Core XTAL frequency * EBX/EAX.
|
|
In newer flavors of the CPU, core xtal frequency is returned in ECX or 0 if not supported.
|
|
@return The number of TSC counts per second.
|
|
|
|
**/
|
|
UINT64
|
|
CpuidCoreClockCalculateTscFrequency (
|
|
VOID
|
|
);
|
|
|
|
/**
|
|
Internal function to retrieves the 64-bit frequency in Hz.
|
|
|
|
Internal function to retrieves the 64-bit frequency in Hz.
|
|
|
|
@return The frequency in Hz.
|
|
|
|
**/
|
|
UINT64
|
|
InternalGetPerformanceCounterFrequency (
|
|
VOID
|
|
)
|
|
{
|
|
return CpuidCoreClockCalculateTscFrequency ();
|
|
}
|