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

[mirror_edk2.git] / SecurityPkg / Library / PlatformSecureLibNull / PlatformSecureLibNull.c

/** @file\r
  NULL PlatformSecureLib instance does NOT really detect whether a physical present\r
  user exists but return TRUE directly. This instance can be used to verify security\r
  related features during platform enabling and development. It should be replaced\r
  by a platform-specific method(e.g. Button pressed) in a real platform for product.\r
\r
Copyright (c) 2011 - 2018, Intel Corporation. All rights reserved.<BR>\r
SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include <Uefi/UefiBaseType.h>\r
\r
BOOLEAN       mUserPhysicalPresence      = FALSE;\r
\r
/**\r
\r
  This function provides a platform-specific method to detect whether the platform\r
  is operating by a physically present user.\r
\r
  Programmatic changing of platform security policy (such as disable Secure Boot,\r
  or switch between Standard/Custom Secure Boot mode) MUST NOT be possible during\r
  Boot Services or after exiting EFI Boot Services. Only a physically present user\r
  is allowed to perform these operations.\r
\r
  NOTE THAT: This function cannot depend on any EFI Variable Service since they are\r
  not available when this function is called in AuthenticateVariable driver.\r
\r
  @retval  TRUE       The platform is operated by a physically present user.\r
  @retval  FALSE      The platform is NOT operated by a physically present user.\r
\r
**/\r
BOOLEAN\r
EFIAPI\r
UserPhysicalPresent (\r
  VOID\r
  )\r
{\r
  return mUserPhysicalPresence;\r
}\r
\r
\r
/**\r
  Save user physical presence state from a PCD to mUserPhysicalPresence.\r
\r
  @retval  EFI_SUCCESS          PcdUserPhysicalPresence is got successfully.\r
\r
**/\r
RETURN_STATUS\r
EFIAPI\r
PlatformSecureLibNullConstructor (\r
  VOID\r
  )\r
{\r
\r
  mUserPhysicalPresence = PcdGetBool(PcdUserPhysicalPresence);\r
\r
  return RETURN_SUCCESS;\r
}\r