OvmfPkg/PlatformPei/Cmos.h

   1 /** @file
   2   PC/AT CMOS access routines
   3
   4   Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #ifndef __CMOS_H__
  10 #define __CMOS_H__
  11
  12 /**
  13   Reads 8-bits of CMOS data.
  14
  15   Reads the 8-bits of CMOS data at the location specified by Index.
  16   The 8-bit read value is returned.
  17
  18   @param  Index  The CMOS location to read.
  19
  20   @return The value read.
  21
  22 **/
  23 UINT8
  24 EFIAPI
  25 CmosRead8 (
  26   IN      UINTN                     Index
  27   );
  28
  29 /**
  30   Writes 8-bits of CMOS data.
  31
  32   Writes 8-bits of CMOS data to the location specified by Index
  33   with the value specified by Value and returns Value.
  34
  35   @param  Index  The CMOS location to write.
  36   @param  Value  The value to write to CMOS.
  37
  38   @return The value written to CMOS.
  39
  40 **/
  41 UINT8
  42 EFIAPI
  43 CmosWrite8 (
  44   IN      UINTN                     Index,
  45   IN      UINT8                     Value
  46   );
  47
  48
  49 #endif
  50