Metronome.c

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#include <PiDxe.h>
 
#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiLib.h>
#include <Library/PcdLib.h>
#include <Library/TimerLib.h>
 
#include <Protocol/Metronome.h>
 
EFI_STATUS
EFIAPI
WaitForTick (
  IN EFI_METRONOME_ARCH_PROTOCOL  *This,
  IN UINT32                       TickNumber
  );
 
EFI_METRONOME_ARCH_PROTOCOL  gMetronome = {
  WaitForTick,
  FixedPcdGet32 (PcdMetronomeTickPeriod)
};
 
EFI_STATUS
EFIAPI
WaitForTick (
  IN EFI_METRONOME_ARCH_PROTOCOL  *This,
  IN UINT32                       TickNumber
  )
{
  //
  // Compute how long to stall the CPU.
  // gMetronome.TickPeriod is in 100 ns units so it needs to be divided by 10
  // to get it in microseconds units.
  //
  MicroSecondDelay (TickNumber * gMetronome.TickPeriod / 10);
  return EFI_SUCCESS;
}
 
EFI_HANDLE  gMetronomeHandle = NULL;
 
EFI_STATUS
EFIAPI
MetronomeInitialize (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS  Status;
 
  //
  // Do any hardware init required to make WaitForTick () to work here.
  //
 
  Status = gBS->InstallMultipleProtocolInterfaces (
                  &gMetronomeHandle,
                  &gEfiMetronomeArchProtocolGuid,
                  &gMetronome,
                  NULL
                  );
  ASSERT_EFI_ERROR (Status);
 
  return Status;
}