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diff --git a/include/VBox/Graphics/VBoxVideoVBE.h b/include/VBox/Graphics/VBoxVideoVBE.h
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+/* $Id: VBoxVideoVBE.h $ */
+/** @file
+ * VirtualBox graphics card port I/O definitions
+ */
+
+/*
+ * Copyright (C) 2006-2023 Oracle and/or its affiliates.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef VBOX_INCLUDED_Graphics_VBoxVideoVBE_h
+#define VBOX_INCLUDED_Graphics_VBoxVideoVBE_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+/* GUEST <-> HOST Communication API */
+
+/** @todo FIXME: Either dynamicly ask host for this or put somewhere high in
+ * physical memory like 0xE0000000. */
+
+#define VBE_DISPI_BANK_ADDRESS 0xA0000
+#define VBE_DISPI_BANK_SIZE_KB 64
+
+#define VBE_DISPI_MAX_XRES 16384
+#define VBE_DISPI_MAX_YRES 16384
+#define VBE_DISPI_MAX_BPP 32
+
+#define VBE_DISPI_IOPORT_INDEX 0x01CE
+#define VBE_DISPI_IOPORT_DATA 0x01CF
+
+#define VBE_DISPI_IOPORT_DAC_WRITE_INDEX 0x03C8
+#define VBE_DISPI_IOPORT_DAC_DATA 0x03C9
+
+/* Cross reference with src/VBox/Devices/Graphics/DevVGA.h */
+#define VBE_DISPI_INDEX_ID 0x0
+#define VBE_DISPI_INDEX_XRES 0x1
+#define VBE_DISPI_INDEX_YRES 0x2
+#define VBE_DISPI_INDEX_BPP 0x3
+#define VBE_DISPI_INDEX_ENABLE 0x4
+#define VBE_DISPI_INDEX_BANK 0x5
+#define VBE_DISPI_INDEX_VIRT_WIDTH 0x6
+#define VBE_DISPI_INDEX_VIRT_HEIGHT 0x7
+#define VBE_DISPI_INDEX_X_OFFSET 0x8
+#define VBE_DISPI_INDEX_Y_OFFSET 0x9
+#define VBE_DISPI_INDEX_VBOX_VIDEO 0xa
+#define VBE_DISPI_INDEX_FB_BASE_HI 0xb
+#define VBE_DISPI_INDEX_CFG 0xc
+
+#define VBE_DISPI_ID0 0xB0C0
+#define VBE_DISPI_ID1 0xB0C1
+#define VBE_DISPI_ID2 0xB0C2
+#define VBE_DISPI_ID3 0xB0C3
+#define VBE_DISPI_ID4 0xB0C4
+
+#define VBE_DISPI_ID_VBOX_VIDEO 0xBE00
+/* The VBOX interface id. Indicates support for VBVA shared memory interface. */
+#define VBE_DISPI_ID_HGSMI 0xBE01
+#define VBE_DISPI_ID_ANYX 0xBE02
+#define VBE_DISPI_ID_CFG 0xBE03 /* VBE_DISPI_INDEX_CFG is available. */
+
+#define VBE_DISPI_DISABLED 0x00
+#define VBE_DISPI_ENABLED 0x01
+#define VBE_DISPI_GETCAPS 0x02
+#define VBE_DISPI_8BIT_DAC 0x20
+/** @note this definition is a BOCHS legacy, used only in the video BIOS
+ * code and ignored by the emulated hardware. */
+#define VBE_DISPI_LFB_ENABLED 0x40
+#define VBE_DISPI_NOCLEARMEM 0x80
+
+/* VBE_DISPI_INDEX_CFG content. */
+#define VBE_DISPI_CFG_MASK_ID 0x0FFF /* Identifier of a configuration value. */
+#define VBE_DISPI_CFG_MASK_SUPPORT 0x1000 /* Query whether the identifier is supported. */
+#define VBE_DISPI_CFG_MASK_RESERVED 0xE000 /* For future extensions. Must be 0. */
+
+/* VBE_DISPI_INDEX_CFG values. */
+#define VBE_DISPI_CFG_ID_VERSION 0x0000 /* Version of the configuration interface. */
+#define VBE_DISPI_CFG_ID_VRAM_SIZE 0x0001 /* VRAM size. */
+#define VBE_DISPI_CFG_ID_3D 0x0002 /* 3D support. */
+#define VBE_DISPI_CFG_ID_VMSVGA 0x0003 /* VMSVGA FIFO and ports are available. */
+#define VBE_DISPI_CFG_ID_VMSVGA_DX 0x0004 /* VGPU10 is enabled. */
+
+#define VGA_PORT_HGSMI_HOST 0x3b0
+#define VGA_PORT_HGSMI_GUEST 0x3d0
+
+#endif /* !VBOX_INCLUDED_Graphics_VBoxVideoVBE_h */
+