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diff --git a/include/VBox/Graphics/VBoxUhgsmi.h b/include/VBox/Graphics/VBoxUhgsmi.h
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+/* $Id: VBoxUhgsmi.h $ */
+/** @file
+ * Document me, pretty please.
+ */
+
+/*
+ * Copyright (C) 2010-2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+#ifndef VBOX_INCLUDED_Graphics_VBoxUhgsmi_h
+#define VBOX_INCLUDED_Graphics_VBoxUhgsmi_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <iprt/cdefs.h>
+#include <iprt/types.h>
+
+typedef struct VBOXUHGSMI *PVBOXUHGSMI;
+
+typedef struct VBOXUHGSMI_BUFFER *PVBOXUHGSMI_BUFFER;
+
+typedef union VBOXUHGSMI_BUFFER_TYPE_FLAGS
+{
+ uint32_t Value;
+ struct
+ {
+ uint32_t fCommand : 1;
+ uint32_t Reserved : 31;
+ } s;
+} VBOXUHGSMI_BUFFER_TYPE_FLAGS;
+
+typedef union VBOXUHGSMI_BUFFER_LOCK_FLAGS
+{
+ uint32_t Value;
+ struct
+ {
+ uint32_t fReadOnly : 1;
+ uint32_t fWriteOnly : 1;
+ uint32_t fDonotWait : 1;
+ uint32_t fDiscard : 1;
+ uint32_t fLockEntire : 1;
+ uint32_t Reserved : 27;
+ } s;
+} VBOXUHGSMI_BUFFER_LOCK_FLAGS;
+
+typedef union VBOXUHGSMI_BUFFER_SUBMIT_FLAGS
+{
+ uint32_t Value;
+ struct
+ {
+ uint32_t fHostReadOnly : 1;
+ uint32_t fHostWriteOnly : 1;
+ uint32_t fDoNotRetire : 1; /**< the buffer will be used in a subsequent command */
+ uint32_t fEntireBuffer : 1;
+ uint32_t Reserved : 28;
+ } s;
+} VBOXUHGSMI_BUFFER_SUBMIT_FLAGS, *PVBOXUHGSMI_BUFFER_SUBMIT_FLAGS;
+
+/* the caller can specify NULL as a hSynch and specify a valid enmSynchType to make UHGSMI create a proper object itself,
+ * */
+typedef DECLCALLBACKTYPE(int, FNVBOXUHGSMI_BUFFER_CREATE,(PVBOXUHGSMI pHgsmi, uint32_t cbBuf, VBOXUHGSMI_BUFFER_TYPE_FLAGS fType,
+ PVBOXUHGSMI_BUFFER* ppBuf));
+typedef FNVBOXUHGSMI_BUFFER_CREATE *PFNVBOXUHGSMI_BUFFER_CREATE;
+
+typedef struct VBOXUHGSMI_BUFFER_SUBMIT
+{
+ PVBOXUHGSMI_BUFFER pBuf;
+ uint32_t offData;
+ uint32_t cbData;
+ VBOXUHGSMI_BUFFER_SUBMIT_FLAGS fFlags;
+} VBOXUHGSMI_BUFFER_SUBMIT, *PVBOXUHGSMI_BUFFER_SUBMIT;
+
+typedef DECLCALLBACKTYPE(int, FNVBOXUHGSMI_BUFFER_SUBMIT,(PVBOXUHGSMI pHgsmi, PVBOXUHGSMI_BUFFER_SUBMIT aBuffers,
+ uint32_t cBuffers));
+typedef FNVBOXUHGSMI_BUFFER_SUBMIT *PFNVBOXUHGSMI_BUFFER_SUBMIT;
+
+typedef DECLCALLBACKTYPE(int, FNVBOXUHGSMI_BUFFER_DESTROY,(PVBOXUHGSMI_BUFFER pBuf));
+typedef FNVBOXUHGSMI_BUFFER_DESTROY *PFNVBOXUHGSMI_BUFFER_DESTROY;
+
+typedef DECLCALLBACKTYPE(int, FNVBOXUHGSMI_BUFFER_LOCK,(PVBOXUHGSMI_BUFFER pBuf, uint32_t offLock, uint32_t cbLock,
+ VBOXUHGSMI_BUFFER_LOCK_FLAGS fFlags, void**pvLock));
+typedef FNVBOXUHGSMI_BUFFER_LOCK *PFNVBOXUHGSMI_BUFFER_LOCK;
+
+typedef DECLCALLBACKTYPE(int, FNVBOXUHGSMI_BUFFER_UNLOCK,(PVBOXUHGSMI_BUFFER pBuf));
+typedef FNVBOXUHGSMI_BUFFER_UNLOCK *PFNVBOXUHGSMI_BUFFER_UNLOCK;
+
+typedef struct VBOXUHGSMI
+{
+ PFNVBOXUHGSMI_BUFFER_CREATE pfnBufferCreate;
+ PFNVBOXUHGSMI_BUFFER_SUBMIT pfnBufferSubmit;
+ /** User custom data. */
+ void *pvUserData;
+} VBOXUHGSMI;
+
+typedef struct VBOXUHGSMI_BUFFER
+{
+ PFNVBOXUHGSMI_BUFFER_LOCK pfnLock;
+ PFNVBOXUHGSMI_BUFFER_UNLOCK pfnUnlock;
+ PFNVBOXUHGSMI_BUFFER_DESTROY pfnDestroy;
+
+ /* r/o data added for ease of access and simplicity
+ * modifying it leads to unpredictable behavior */
+ VBOXUHGSMI_BUFFER_TYPE_FLAGS fType;
+ uint32_t cbBuffer;
+ /** User custom data. */
+ void *pvUserData;
+} VBOXUHGSMI_BUFFER;
+
+#define VBoxUhgsmiBufferCreate(_pUhgsmi, _cbBuf, _fType, _ppBuf) ((_pUhgsmi)->pfnBufferCreate(_pUhgsmi, _cbBuf, _fType, _ppBuf))
+#define VBoxUhgsmiBufferSubmit(_pUhgsmi, _aBuffers, _cBuffers) ((_pUhgsmi)->pfnBufferSubmit(_pUhgsmi, _aBuffers, _cBuffers))
+
+#define VBoxUhgsmiBufferLock(_pBuf, _offLock, _cbLock, _fFlags, _pvLock) ((_pBuf)->pfnLock(_pBuf, _offLock, _cbLock, _fFlags, _pvLock))
+#define VBoxUhgsmiBufferUnlock(_pBuf) ((_pBuf)->pfnUnlock(_pBuf))
+#define VBoxUhgsmiBufferDestroy(_pBuf) ((_pBuf)->pfnDestroy(_pBuf))
+
+#endif /* !VBOX_INCLUDED_Graphics_VBoxUhgsmi_h */
+