/** @file

  Task priority (TPL) functions.

Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>

SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include "DxeMain.h"

#define VALID_TPL(a)            ((a) <= TPL_HIGH_LEVEL)

EFI_TPL gEfiCurrentTpl = TPL_APPLICATION;

/**

  Raise the task priority level to the new level.

  High level is implemented by disabling processor interrupts.

  @param  NewTpl  New task priority level

  @return The previous task priority level

**/

EFI_TPL

EFIAPI

CoreRaiseTpl (

  IN EFI_TPL      NewTpl

  )

{

  EFI_TPL     OldTpl;

  OldTpl = gEfiCurrentTpl;

  if (OldTpl > NewTpl) {

    DEBUG ((EFI_D_ERROR, "FATAL ERROR - RaiseTpl with OldTpl(0x%x) > NewTpl(0x%x)\n", OldTpl, NewTpl));

    ASSERT (FALSE);

  }

  ASSERT (VALID_TPL (NewTpl));

  //

  // Set the new value

  //

  gEfiCurrentTpl = NewTpl;

  return OldTpl;

}

/**

  Lowers the task priority to the previous value.   If the new

  priority unmasks events at a higher priority, they are dispatched.

  @param  NewTpl  New, lower, task priority

**/

VOID

EFIAPI

CoreRestoreTpl (

  IN EFI_TPL NewTpl

  )

{

  EFI_TPL     OldTpl;

  OldTpl = gEfiCurrentTpl;

  if (NewTpl > OldTpl) {

    DEBUG ((EFI_D_ERROR, "FATAL ERROR - RestoreTpl with NewTpl(0x%x) > OldTpl(0x%x)\n", NewTpl, OldTpl));

    ASSERT (FALSE);

  }

  ASSERT (VALID_TPL (NewTpl));

  //

  // Set the new value

  //

  gEfiCurrentTpl = NewTpl;

}