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				/*-
				* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
				*
				* Copyright (c) 2021 Beckhoff Automation GmbH & Co. KG
				* Author: Corvin Köhne <c.koehne@beckhoff.com>
				*/

				#include <sys/cdefs.h>
				__FBSDID("$FreeBSD$");

				#include <sys/param.h>
				#include <sys/bus.h>
				#include <sys/kernel.h>

				#include <vm/vm.h>
				#include <vm/pmap.h>

				#include <dev/pci/pcireg.h>
				#include <dev/pci/pcivar.h>

				#include "intelgpu.h"

				#define KB (1024UL)

				int
				vm_intelgpu_get_opregion(vm_paddr_t const base, vm_paddr_t const size)
				{
				/* intel graphics device is always located at 0:2.0 */
				device_t dev = pci_find_bsf(0, 2, 0);
				if (dev == NULL) {
				return (ENOENT);
				}

				if ((pci_get_vendor(dev) != PCI_VENDOR_INTEL) \|\|
				(pci_get_class(dev) != PCIC_DISPLAY) \|\|
				(pci_get_subclass(dev) != PCIS_DISPLAY_VGA)) {
				return (ENODEV);
				}

				const uint64_t asls = pci_read_config(dev, PCIR_ASLS_CTL, 4);

				const struct igd_opregion_header *const opregion_header =
				(struct igd_opregion_header *)pmap_map(NULL, asls,
				asls + sizeof(*opregion_header), VM_PROT_READ);
				if (opregion_header == NULL \|\|
				memcmp(opregion_header->sign, IGD_OPREGION_HEADER_SIGN,
				sizeof(opregion_header->sign))) {
				return (ENODEV);
				}

				*base = asls;
				size = opregion_header->size KB;

				return (0);
				}