This disclosure is directed to firmware-related event notification. A device may comprise an operating system (OS) configured to operate on a platform. During initialization of the device a firmware module in the platform may load at least one globally unique identifier (GUID) into a firmware configuration table. When the platform notifies the OS, the firmware module may load at least one GUID into a platform notification table and may set a platform notification bit in a platform notification table status field. Upon detecting the notification, an OS management module may establish a source of the notification by querying the platform notification table. The platform notification bit may cause the OS management module to compare GUIDs in the platform notification table and the firmware configuration table. Services may be called based on any matching GUIDs. If no GUIDs match, the services may be called based on firmware variables in the device.