OvmfPkg/XenPlatformPei: no hvmloader: get the E820 table via hypercall

[mirror_edk2.git] / OvmfPkg / XenPlatformPei / Cmos.c

/** @file\r
  PC/AT CMOS access routines\r
\r
  Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>\r
  Copyright (c) 2019, Citrix Systems, Inc.\r
\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
\r
#include "Cmos.h"\r
#include "Library/IoLib.h"\r
\r
/**\r
  Reads 8-bits of CMOS data.\r
\r
  Reads the 8-bits of CMOS data at the location specified by Index.\r
  The 8-bit read value is returned.\r
\r
  @param  Index  The CMOS location to read.\r
\r
  @return The value read.\r
\r
**/\r
UINT8\r
EFIAPI\r
CmosRead8 (\r
  IN      UINTN                     Index\r
  )\r
{\r
  IoWrite8 (0x70, (UINT8) Index);\r
  return IoRead8 (0x71);\r
}\r
\r
\r
/**\r
  Writes 8-bits of CMOS data.\r
\r
  Writes 8-bits of CMOS data to the location specified by Index\r
  with the value specified by Value and returns Value.\r
\r
  @param  Index  The CMOS location to write.\r
  @param  Value  The value to write to CMOS.\r
\r
  @return The value written to CMOS.\r
\r
**/\r
UINT8\r
EFIAPI\r
CmosWrite8 (\r
  IN      UINTN                     Index,\r
  IN      UINT8                     Value\r
  )\r
{\r
  IoWrite8 (0x70, (UINT8) Index);\r
  IoWrite8 (0x71, Value);\r
  return Value;\r
}\r
\r