MdePkg/Library/BaseLib/IntelTdxNull.c

   1 /** @file
   2
   3   Null stub of TdxLib
   4
   5   Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
   6   SPDX-License-Identifier: BSD-2-Clause-Patent
   7
   8 **/
   9
  10 #include <Library/BaseLib.h>
  11 #include <Uefi/UefiBaseType.h>
  12
  13 /**
  14   The TDCALL instruction causes a VM exit to the Intel TDX module.  It is
  15   used to call guest-side Intel TDX functions, either local or a TD exit
  16   to the host VMM, as selected by Leaf.
  17   Leaf functions are described at <https://software.intel.com/content/
  18   www/us/en/develop/articles/intel-trust-domain-extensions.html>
  19
  20   @param[in]      Leaf        Leaf number of TDCALL instruction
  21   @param[in]      Arg1        Arg1
  22   @param[in]      Arg2        Arg2
  23   @param[in]      Arg3        Arg3
  24   @param[in,out]  Results  Returned result of the Leaf function
  25
  26   @return EFI_SUCCESS
  27   @return Other           See individual leaf functions
  28 **/
  29 UINTN
  30 EFIAPI
  31 TdCall (
  32   IN UINT64    Leaf,
  33   IN UINT64    Arg1,
  34   IN UINT64    Arg2,
  35   IN UINT64    Arg3,
  36   IN OUT VOID  *Results
  37   )
  38 {
  39   return EFI_UNSUPPORTED;
  40 }
  41
  42 /**
  43   TDVMALL is a leaf function 0 for TDCALL. It helps invoke services from the
  44   host VMM to pass/receive information.
  45
  46   @param[in]     Leaf        Number of sub-functions
  47   @param[in]     Arg1        Arg1
  48   @param[in]     Arg2        Arg2
  49   @param[in]     Arg3        Arg3
  50   @param[in]     Arg4        Arg4
  51   @param[in,out] Results     Returned result of the sub-function
  52
  53   @return EFI_SUCCESS
  54   @return Other           See individual sub-functions
  55
  56 **/
  57 UINTN
  58 EFIAPI
  59 TdVmCall (
  60   IN UINT64    Leaf,
  61   IN UINT64    Arg1,
  62   IN UINT64    Arg2,
  63   IN UINT64    Arg3,
  64   IN UINT64    Arg4,
  65   IN OUT VOID  *Results
  66   )
  67 {
  68   return EFI_UNSUPPORTED;
  69 }
  70
  71 /**
  72   Probe if TD is enabled.
  73
  74   @return TRUE    TD is enabled.
  75   @return FALSE   TD is not enabled.
  76 **/
  77 BOOLEAN
  78 EFIAPI
  79 TdIsEnabled (
  80   )
  81 {
  82   return FALSE;
  83 }