1 files changed, 26 insertions, 0 deletions
diff --git a/src/acpi/acpigen_pci.c b/src/acpi/acpigen_pci.c
new file mode 100644
index 0000000000..66f8dcd1bd
--- /dev/null
+++ b/src/acpi/acpigen_pci.c
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <acpi/acpigen.h>
+#include <acpi/acpigen_pci.h>
+#include <assert.h>
+#include <device/device.h>
+#include <device/pci_def.h>
+#include <device/pci_type.h>
+#include <types.h>
+
+void acpigen_write_ADR_pci_devfn(pci_devfn_t devfn)
+{
+	/*
+	 * _ADR for PCI Bus is encoded as follows:
+	 * [63:32] - unused
+	 * [31:16] - device #
+	 * [15:0]  - function #
+	 */
+	acpigen_write_ADR(PCI_SLOT(devfn) << 16 | PCI_FUNC(devfn));
+}
+
+void acpigen_write_ADR_pci_device(const struct device *dev)
+{
+	assert(dev->path.type == DEVICE_PATH_PCI);
+	acpigen_write_ADR_pci_devfn(dev->path.pci.devfn);
+}