1 files changed, 25 insertions, 0 deletions
diff --git a/MdeModulePkg/Include/Pi/PrePiDxeCis.h b/MdeModulePkg/Include/Pi/PrePiDxeCis.h
new file mode 100644
index 0000000000..113ac37924
--- /dev/null
+++ b/MdeModulePkg/Include/Pi/PrePiDxeCis.h
@@ -0,0 +1,25 @@
+/** @file
+  Include file matches things in PI.
+
+Copyright (c) 2022, Intel Corporation. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef MDE_MODULEPKG_PRE_PI_DXE_CIS_H_
+#define MDE_MODULEPKG_PRE_PI_DXE_CIS_H_
+
+///
+/// A memory region that describes system memory that has not been accepted
+/// by a corresponding call to the underlying isolation architecture.
+///
+/// This memory region has not been defined in PI spec, so it is defined in
+/// PrePiDxeCis.h. And it is defined in the format of captial letters
+/// because only capital letters are allowed to be used for #define declarations.
+///
+/// After this memory region is defined in PI spec, it should be a value in
+/// EFI_GCD_MEMORY_TYPE in PiDxeCis.h.
+///
+#define  EFI_GCD_MEMORY_TYPE_UNACCEPTED  7
+
+#endif