UefiCpuPkg: Move AsmRelocateApLoopStart from Mpfuncs.nasm to AmdSev.nasm

[mirror_edk2.git] / OvmfPkg / Library / PlatformInitLib / Cmos.c

/** @file\r
  PC/AT CMOS access routines\r
\r
  Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include <Library/PlatformInitLib.h>\r
#include <Library/DebugLib.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
PlatformCmosRead8 (\r
  IN      UINTN  Index\r
  )\r
{\r
  IoWrite8 (0x70, (UINT8)Index);\r
  return IoRead8 (0x71);\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
PlatformCmosWrite8 (\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
/**\r
   Dump the CMOS content\r
 */\r
VOID\r
EFIAPI\r
PlatformDebugDumpCmos (\r
  VOID\r
  )\r
{\r
  UINT32  Loop;\r
\r
  DEBUG ((DEBUG_INFO, "CMOS:\n"));\r
\r
  for (Loop = 0; Loop < 0x80; Loop++) {\r
    if ((Loop % 0x10) == 0) {\r
      DEBUG ((DEBUG_INFO, "%02x:", Loop));\r
    }\r
\r
    DEBUG ((DEBUG_INFO, " %02x", PlatformCmosRead8 (Loop)));\r
    if ((Loop % 0x10) == 0xf) {\r
      DEBUG ((DEBUG_INFO, "\n"));\r
    }\r
  }\r
}\r