ClearCache.c

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#include <Library/CacheMaintenanceLib.h>
#include <Library/DebugLib.h>
#include <Library/PeiServicesLib.h>
#include <Ppi/MpServices.h>
 
#include "Platform.h"
 
STATIC
VOID
EFIAPI
ClearCache (
  IN OUT VOID  *WorkSpace
  )
{
  WriteBackInvalidateDataCache ();
  InvalidateInstructionCache ();
}
 
STATIC
EFI_STATUS
EFIAPI
ClearCacheOnMpServicesAvailable (
  IN EFI_PEI_SERVICES           **PeiServices,
  IN EFI_PEI_NOTIFY_DESCRIPTOR  *NotifyDescriptor,
  IN VOID                       *Ppi
  )
{
  EFI_PEI_MP_SERVICES_PPI  *MpServices;
  EFI_STATUS               Status;
 
  DEBUG ((DEBUG_INFO, "%a: %a\n", gEfiCallerBaseName, __func__));
 
  //
  // Clear cache on all the APs in parallel.
  //
  MpServices = Ppi;
  Status     = MpServices->StartupAllAPs (
                             (CONST EFI_PEI_SERVICES **)PeiServices,
                             MpServices,
                             ClearCache,      // Procedure
                             FALSE,           // SingleThread
                             0,               // TimeoutInMicroSeconds: inf.
                             NULL             // ProcedureArgument
                             );
  if (EFI_ERROR (Status) && (Status != EFI_NOT_STARTED)) {
    DEBUG ((DEBUG_ERROR, "%a: StartupAllAps(): %r\n", __func__, Status));
    return Status;
  }
 
  //
  // Now clear cache on the BSP too.
  //
  ClearCache (NULL);
  return EFI_SUCCESS;
}
 
//
// Notification object for registering the callback, for when
// EFI_PEI_MP_SERVICES_PPI becomes available.
//
STATIC CONST EFI_PEI_NOTIFY_DESCRIPTOR  mMpServicesNotify = {
  EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK | // Flags
  EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,
  &gEfiPeiMpServicesPpiGuid,               // Guid
  ClearCacheOnMpServicesAvailable          // Notify
};
 
VOID
InstallClearCacheCallback (
  VOID
  )
{
  EFI_STATUS  Status;
 
  Status = PeiServicesNotifyPpi (&mMpServicesNotify);
  if (EFI_ERROR (Status)) {
    DEBUG ((
      DEBUG_ERROR,
      "%a: failed to set up MP Services callback: %r\n",
      __func__,
      Status
      ));
  }
}