Re: TimerLib - usable library on X64?

[Andrew Fish <afish@apple.com>]

Ryszard,

The different libraries mix timers, and TSC (for x86). 

For some of the timer libs there may be some PCD settings that need to get mapped to your platform. You can look in the timer libs INF to see what it depends on.

PcAtChipsetPkg/Library/AcpiTimerLib/DxeAcpiTimerLib.inf

[Pcd]
  gPcAtChipsetPkgTokenSpaceGuid.PcdAcpiIoPciBusNumber             ## CONSUMES
  gPcAtChipsetPkgTokenSpaceGuid.PcdAcpiIoPciDeviceNumber          ## CONSUMES
  gPcAtChipsetPkgTokenSpaceGuid.PcdAcpiIoPciFunctionNumber        ## CONSUMES
  gPcAtChipsetPkgTokenSpaceGuid.PcdAcpiIoPciEnableRegisterOffset  ## CONSUMES
  gPcAtChipsetPkgTokenSpaceGuid.PcdAcpiIoBarEnableMask            ## CONSUMES
  gPcAtChipsetPkgTokenSpaceGuid.PcdAcpiIoPciBarRegisterOffset     ## CONSUMES
  gPcAtChipsetPkgTokenSpaceGuid.PcdAcpiIoPortBaseAddress          ## CONSUMES
  gPcAtChipsetPkgTokenSpaceGuid.PcdAcpiPm1TmrOffset               ## CONSUMES
  gPcAtChipsetPkgTokenSpaceGuid.PcdAcpiIoPortBaseAddressMask      ## CONSUMES

Thanks,

Andrew Fish

> On Nov 6, 2018, at 6:13 AM, Knop, Ryszard <ryszard.knop@intel.com> wrote:
> 
> Hi everyone,
> I'm trying to use TimerLib to precisely measure time elapsed between specific functions, and I'm having some issues trying to get it to work. On X64 platforms all I get is (depending on the TimerLib impl I use) either zeroes from QueryPerformanceCounter (QueryPerformanceCounterProperties returns zeroes for all the counters, except the frequency which is always reported as 100Hz), or the platform hangs. I've tried a few TimerLib implementations and I'm a bit out of ideas by now. Am I doing something wrong in the code itself, or is there any concrete implementation that is known to work well?
> 
> Sources I'm using: https://gist.github.com/DragoonAethis/7df6d8fb35c4f1932ec42bacbcbf73a8
> 
> Thanks, Richard.
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