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//! Common part shared across all the devices.
use bitflags::bitflags;
bitflags! {
/// Common device-independent VirtIO device features.
#[derive(Copy, Clone, Debug, Default, Eq, PartialEq)]
pub struct Feature: u64 {
/// Legacy: The device must issue a used buffer notification when it runs out of available
/// descriptors, even if notifications are suppressed.
const NOTIFY_ON_EMPTY = 1 << 24;
/// Legacy: The device accepts arbitrary descriptor layouts.
const ANY_LAYOUT = 1 << 27;
/// The device can use descriptors with the indirect flag set.
const RING_INDIRECT_DESC = 1 << 28;
/// The `used_event` and `avail_event` fields can be used.
const RING_EVENT_IDX = 1 << 29;
/// Legacy: Used by QEMU's implemenation for experimental early versions of VirtIO which
/// didn't perform correct feature notification.
const UNUSED = 1 << 30;
/// Supports VirtIO version 1 or higher, rather than the legacy version.
const VERSION_1 = 1 << 32;
/// The device can be used on a platform where device access to memory is limited or
/// translated.
const ACCESS_PLATFORM = 1 << 33;
/// Use packed virtqueue layout.
const RING_PACKED = 1 << 34;
/// The device uses buffers in the same order that they were made available.
const IN_ORDER = 1 << 35;
/// Memory access by the driver and device are ordered in a way described by the platform.
const ORDER_PLATFORM = 1 << 36;
/// The device supports Single Root I/O Virtualisation.
const SR_IOV = 1 << 37;
/// The driver passes extra data in its device notifications.
const NOTIFICATION_DATA = 1 << 38;
}
}