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31 #ifndef _VIRTIO_CONFIG_H_
32 #define _VIRTIO_CONFIG_H_
34 /* Status byte for guest to report progress. */
35 #define VIRTIO_CONFIG_STATUS_RESET 0x00
36 #define VIRTIO_CONFIG_STATUS_ACK 0x01
37 #define VIRTIO_CONFIG_STATUS_DRIVER 0x03
38 #define VIRTIO_CONFIG_STATUS_DRIVER_OK 0x04
39 #define VIRTIO_CONFIG_STATUS_FAILED 0x80
42 * Generate interrupt when the virtqueue ring is
43 * completely used, even if we've suppressed them.
45 #define VIRTIO_F_NOTIFY_ON_EMPTY (1 << 24)
47 /* Support for indirect buffer descriptors. */
48 #define VIRTIO_RING_F_INDIRECT_DESC (1 << 28)
50 /* Support to suppress interrupt until specific index is reached. */
51 #define VIRTIO_RING_F_EVENT_IDX (1 << 29)
54 * The guest should never negotiate this feature; it
55 * is used to detect faulty drivers.
57 #define VIRTIO_F_BAD_FEATURE (1 << 30)
60 * Some VirtIO feature bits (currently bits 28 through 31) are
61 * reserved for the transport being used (eg. virtio_ring), the
62 * rest are per-device feature bits.
64 #define VIRTIO_TRANSPORT_F_START 28
65 #define VIRTIO_TRANSPORT_F_END 32
67 #endif /* _VIRTIO_CONFIG_H_ */