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diff --git a/usr.sbin/bhyve/pci_gvt-d.h b/usr.sbin/bhyve/pci_gvt-d.h
new file mode 100644
--- /dev/null
+++ b/usr.sbin/bhyve/pci_gvt-d.h
@@ -0,0 +1,184 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2023 Beckhoff Automation GmbH & Co. KG
+ * Author: Corvin Köhne <c.koehne@beckhoff.com>
+ */
+
+#pragma once
+
+#include <sys/types.h>
+
+/*
+ * See
+ * <https://github.com/tianocore/edk2-platforms/blob/82979ab1ca44101e0b92a9c4bda1dfe64a8249f6/Silicon/Intel/IntelSiliconPkg/Include/IndustryStandard/IgdOpRegion.h>
+ */
+
+#define IGD_OPREGION_HEADER_SIGN "IntelGraphicsMem"
+#define IGD_OPREGION_HEADER_MBOX1 BIT0
+#define IGD_OPREGION_HEADER_MBOX2 BIT1
+#define IGD_OPREGION_HEADER_MBOX3 BIT2
+#define IGD_OPREGION_HEADER_MBOX4 BIT3
+#define IGD_OPREGION_HEADER_MBOX5 BIT4
+
+#define IGD_OPREGION_VBT_SIZE_6K (6 * 1024UL)
+
+/**
+ OpRegion structures:
+ Sub-structures define the different parts of the OpRegion followed by the
+ main structure representing the entire OpRegion.
+ @note These structures are packed to 1 byte offsets because the exact
+ data location is required by the supporting design specification due to
+ the fact that the data is used by ASL and Graphics driver code compiled
+ separately.
+**/
+#pragma pack(1)
+///
+/// OpRegion Mailbox 0 Header structure. The OpRegion Header is used to
+/// identify a block of memory as the graphics driver OpRegion.
+/// Offset 0x0, Size 0x100
+///
+struct igd_opregion_header {
+ int8_t sign[0x10]; ///< Offset 0x00 OpRegion Signature
+ uint32_t size; ///< Offset 0x10 OpRegion Size
+ uint32_t over; ///< Offset 0x14 OpRegion Structure Version
+ uint8_t sver[0x20]; ///< Offset 0x18 System BIOS Build Version
+ uint8_t vver[0x10]; ///< Offset 0x38 Video BIOS Build Version
+ uint8_t gver[0x10]; ///< Offset 0x48 Graphic Driver Build Version
+ uint32_t mbox; ///< Offset 0x58 Supported Mailboxes
+ uint32_t dmod; ///< Offset 0x5C Driver Model
+ uint32_t pcon; ///< Offset 0x60 Platform Configuration
+ int16_t dver[0x10]; ///< Offset 0x64 GOP Version
+ uint8_t rm01[0x7C]; ///< Offset 0x84 Reserved Must be zero
+};
+
+///
+/// OpRegion Mailbox 1 - Public ACPI Methods
+/// Offset 0x100, Size 0x100
+///
+struct igd_opregion_mbox1 {
+ uint32_t drdy; ///< Offset 0x100 Driver Readiness
+ uint32_t csts; ///< Offset 0x104 Status
+ uint32_t cevt; ///< Offset 0x108 Current Event
+ uint8_t rm11[0x14]; ///< Offset 0x10C Reserved Must be Zero
+ uint32_t didl[8]; ///< Offset 0x120 Supported Display Devices ID List
+ uint32_t
+ cpdl[8]; ///< Offset 0x140 Currently Attached Display Devices List
+ uint32_t
+ cadl[8]; ///< Offset 0x160 Currently Active Display Devices List
+ uint32_t nadl[8]; ///< Offset 0x180 Next Active Devices List
+ uint32_t aslp; ///< Offset 0x1A0 ASL Sleep Time Out
+ uint32_t tidx; ///< Offset 0x1A4 Toggle Table Index
+ uint32_t chpd; ///< Offset 0x1A8 Current Hotplug Enable Indicator
+ uint32_t clid; ///< Offset 0x1AC Current Lid State Indicator
+ uint32_t cdck; ///< Offset 0x1B0 Current Docking State Indicator
+ uint32_t sxsw; ///< Offset 0x1B4 Display Switch Notification on Sx
+ ///< StateResume
+ uint32_t evts; ///< Offset 0x1B8 Events supported by ASL
+ uint32_t cnot; ///< Offset 0x1BC Current OS Notification
+ uint32_t NRDY; ///< Offset 0x1C0 Driver Status
+ uint8_t did2[0x1C]; ///< Offset 0x1C4 Extended Supported Devices ID
+ ///< List(DOD)
+ uint8_t
+ cpd2[0x1C]; ///< Offset 0x1E0 Extended Attached Display Devices List
+ uint8_t rm12[4]; ///< Offset 0x1FC - 0x1FF Reserved Must be zero
+};
+
+///
+/// OpRegion Mailbox 2 - Software SCI Interface
+/// Offset 0x200, Size 0x100
+///
+struct igd_opregion_mbox2 {
+ uint32_t scic; ///< Offset 0x200 Software SCI Command / Status / Data
+ uint32_t parm; ///< Offset 0x204 Software SCI Parameters
+ uint32_t dslp; ///< Offset 0x208 Driver Sleep Time Out
+ uint8_t rm21[0xF4]; ///< Offset 0x20C - 0x2FF Reserved Must be zero
+};
+
+///
+/// OpRegion Mailbox 3 - BIOS/Driver Notification - ASLE Support
+/// Offset 0x300, Size 0x100
+///
+struct igd_opregion_mbox3 {
+ uint32_t ardy; ///< Offset 0x300 Driver Readiness
+ uint32_t aslc; ///< Offset 0x304 ASLE Interrupt Command / Status
+ uint32_t tche; ///< Offset 0x308 Technology Enabled Indicator
+ uint32_t alsi; ///< Offset 0x30C Current ALS Luminance Reading
+ uint32_t bclp; ///< Offset 0x310 Requested Backlight Brightness
+ uint32_t pfit; ///< Offset 0x314 Panel Fitting State or Request
+ uint32_t cblv; ///< Offset 0x318 Current Brightness Level
+ uint16_t bclm[0x14]; ///< Offset 0x31C Backlight Brightness Levels Duty
+ ///< Cycle Mapping Table
+ uint32_t cpfm; ///< Offset 0x344 Current Panel Fitting Mode
+ uint32_t epfm; ///< Offset 0x348 Enabled Panel Fitting Modes
+ uint8_t plut[0x4A]; ///< Offset 0x34C Panel Look Up Table & Identifier
+ uint32_t pfmb; ///< Offset 0x396 PWM Frequency and Minimum Brightness
+ uint32_t ccdv; ///< Offset 0x39A Color Correction Default Values
+ uint32_t pcft; ///< Offset 0x39E Power Conservation Features
+ uint32_t srot; ///< Offset 0x3A2 Supported Rotation Angles
+ uint32_t iuer; ///< Offset 0x3A6 Intel Ultrabook(TM) Event Register
+ uint64_t fdss; ///< Offset 0x3AA DSS Buffer address allocated for IFFS
+ ///< feature
+ uint32_t fdsp; ///< Offset 0x3B2 Size of DSS buffer
+ uint32_t stat; ///< Offset 0x3B6 State Indicator
+ uint64_t rvda; ///< Offset 0x3BA Absolute/Relative Address of Raw VBT
+ ///< Data from OpRegion Base
+ uint32_t rvds; ///< Offset 0x3C2 Raw VBT Data Size
+ uint8_t rsvd2[0x3A]; ///< Offset 0x3C6 - 0x3FF Reserved Must be zero.
+ ///< Bug in spec 0x45(69)
+};
+
+///
+/// OpRegion Mailbox 4 - VBT Video BIOS Table
+/// Offset 0x400, Size 0x1800
+///
+struct igd_opregion_mbox4 {
+ uint8_t rvbt[IGD_OPREGION_VBT_SIZE_6K]; ///< Offset 0x400 - 0x1BFF Raw
+ ///< VBT Data
+};
+
+///
+/// OpRegion Mailbox 5 - BIOS/Driver Notification - Data storage BIOS to Driver
+/// data sync Offset 0x1C00, Size 0x400
+///
+struct igd_opregion_mbox5 {
+ uint32_t phed; ///< Offset 0x1C00 Panel Header
+ uint8_t bddc[0x100]; ///< Offset 0x1C04 Panel EDID (DDC data)
+ uint8_t rm51[0x2FC]; ///< Offset 0x1D04 - 0x1FFF Reserved Must be zero
+};
+
+///
+/// IGD OpRegion Structure
+///
+struct igd_opregion {
+ struct igd_opregion_header
+ header; ///< OpRegion header (Offset 0x0, Size 0x100)
+ struct igd_opregion_mbox1 mbox1; ///< Mailbox 1: Public ACPI Methods
+ ///< (Offset 0x100, Size 0x100)
+ struct igd_opregion_mbox2 mbox2; ///< Mailbox 2: Software SCI Interface
+ ///< (Offset 0x200, Size 0x100)
+ struct igd_opregion_mbox3
+ mbox3; ///< Mailbox 3: BIOS to Driver Notification (Offset 0x300,
+ ///< Size 0x100)
+ struct igd_opregion_mbox4 mbox4; ///< Mailbox 4: Video BIOS Table (VBT)
+ ///< (Offset 0x400, Size 0x1800)
+ struct igd_opregion_mbox5
+ mbox5; ///< Mailbox 5: BIOS to Driver Notification Extension (Offset
+ ///< 0x1C00, Size 0x400)
+};
+
+///
+/// VBT Header Structure
+///
+struct vbt_header {
+ uint8_t product_string[20];
+ uint16_t version;
+ uint16_t header_size;
+ uint16_t table_size;
+ uint8_t checksum;
+ uint8_t reserved1;
+ uint32_t bios_data_offset;
+ uint32_t aim_data_offset[4];
+};
+
+#pragma pack()

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