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