MdePkg: Introduce basic Tdx functions in BaseLib

[mirror_edk2.git] / MdePkg / Library / BaseLib / IntelTdxNull.c

diff --git a/MdePkg/Library/BaseLib/IntelTdxNull.c b/MdePkg/Library/BaseLib/IntelTdxNull.c
new file mode 100644 (file)
index 0000000..ec95470
--- /dev/null
+++ b/MdePkg/Library/BaseLib/IntelTdxNull.c
@@ -0,0 +1,83 @@
+/** @file\r
+\r
+  Null stub of TdxLib\r
+\r
+  Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>\r
+  SPDX-License-Identifier: BSD-2-Clause-Patent\r
+\r
+**/\r
+\r
+#include <Library/BaseLib.h>\r
+#include <Uefi/UefiBaseType.h>\r
+\r
+/**\r
+  The TDCALL instruction causes a VM exit to the Intel TDX module.  It is\r
+  used to call guest-side Intel TDX functions, either local or a TD exit\r
+  to the host VMM, as selected by Leaf.\r
+  Leaf functions are described at <https://software.intel.com/content/\r
+  www/us/en/develop/articles/intel-trust-domain-extensions.html>\r
+\r
+  @param[in]      Leaf        Leaf number of TDCALL instruction\r
+  @param[in]      Arg1        Arg1\r
+  @param[in]      Arg2        Arg2\r
+  @param[in]      Arg3        Arg3\r
+  @param[in,out]  Results  Returned result of the Leaf function\r
+\r
+  @return EFI_SUCCESS\r
+  @return Other           See individual leaf functions\r
+**/\r
+UINTN\r
+EFIAPI\r
+TdCall (\r
+  IN UINT64    Leaf,\r
+  IN UINT64    Arg1,\r
+  IN UINT64    Arg2,\r
+  IN UINT64    Arg3,\r
+  IN OUT VOID  *Results\r
+  )\r
+{\r
+  return EFI_UNSUPPORTED;\r
+}\r
+\r
+/**\r
+  TDVMALL is a leaf function 0 for TDCALL. It helps invoke services from the\r
+  host VMM to pass/receive information.\r
+\r
+  @param[in]     Leaf        Number of sub-functions\r
+  @param[in]     Arg1        Arg1\r
+  @param[in]     Arg2        Arg2\r
+  @param[in]     Arg3        Arg3\r
+  @param[in]     Arg4        Arg4\r
+  @param[in,out] Results     Returned result of the sub-function\r
+\r
+  @return EFI_SUCCESS\r
+  @return Other           See individual sub-functions\r
+\r
+**/\r
+UINTN\r
+EFIAPI\r
+TdVmCall (\r
+  IN UINT64    Leaf,\r
+  IN UINT64    Arg1,\r
+  IN UINT64    Arg2,\r
+  IN UINT64    Arg3,\r
+  IN UINT64    Arg4,\r
+  IN OUT VOID  *Results\r
+  )\r
+{\r
+  return EFI_UNSUPPORTED;\r
+}\r
+\r
+/**\r
+  Probe if TD is enabled.\r
+\r
+  @return TRUE    TD is enabled.\r
+  @return FALSE   TD is not enabled.\r
+**/\r
+BOOLEAN\r
+EFIAPI\r
+TdIsEnabled (\r
+  )\r
+{\r
+  return FALSE;\r
+}\r