OvmfPkg/XenPlatformPei/Cmos.h

   1 /** @file
   2   PC/AT CMOS access routines
   3
   4   Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
   5   Copyright (c) 2019, Citrix Systems, Inc.
   6
   7   SPDX-License-Identifier: BSD-2-Clause-Patent
   8
   9 **/
  10
  11 #ifndef __CMOS_H__
  12 #define __CMOS_H__
  13
  14 /**
  15   Reads 8-bits of CMOS data.
  16
  17   Reads the 8-bits of CMOS data at the location specified by Index.
  18   The 8-bit read value is returned.
  19
  20   @param  Index  The CMOS location to read.
  21
  22   @return The value read.
  23
  24 **/
  25 UINT8
  26 EFIAPI
  27 CmosRead8 (
  28   IN      UINTN  Index
  29   );
  30
  31 /**
  32   Writes 8-bits of CMOS data.
  33
  34   Writes 8-bits of CMOS data to the location specified by Index
  35   with the value specified by Value and returns Value.
  36
  37   @param  Index  The CMOS location to write.
  38   @param  Value  The value to write to CMOS.
  39
  40   @return The value written to CMOS.
  41
  42 **/
  43 UINT8
  44 EFIAPI
  45 CmosWrite8 (
  46   IN      UINTN  Index,
  47   IN      UINT8  Value
  48   );
  49
  50 #endif