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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 /* We have seen device and processed generic fields. */
37 #define VIRTIO_CONFIG_STATUS_ACK 0x01
38 /* We have found a driver for the device. */
39 #define VIRTIO_CONFIG_STATUS_DRIVER 0x02
40 /* Driver has used its parts of the config, and is happy. */
41 #define VIRTIO_CONFIG_STATUS_DRIVER_OK 0x04
42 /* Driver has finished configuring features (modern only). */
43 #define VIRTIO_CONFIG_S_FEATURES_OK 0x08
44 /* Device entered invalid state, driver must reset it. */
45 #define VIRTIO_CONFIG_S_NEEDS_RESET 0x40
46 /* We've given up on this device. */
47 #define VIRTIO_CONFIG_STATUS_FAILED 0x80
50 * Generate interrupt when the virtqueue ring is
51 * completely used, even if we've suppressed them.
53 #define VIRTIO_F_NOTIFY_ON_EMPTY (1UL << 24)
55 /* Can the device handle any descriptor layout? */
56 #define VIRTIO_F_ANY_LAYOUT (1UL << 27)
58 /* Support for indirect buffer descriptors. */
59 #define VIRTIO_RING_F_INDIRECT_DESC (1UL << 28)
61 /* Support to suppress interrupt until specific index is reached. */
62 #define VIRTIO_RING_F_EVENT_IDX (1UL << 29)
65 * The guest should never negotiate this feature; it
66 * is used to detect faulty drivers.
68 #define VIRTIO_F_BAD_FEATURE (1UL << 30)
71 #define VIRTIO_F_VERSION_1 (1ULL << 32)
74 * If clear - device has the IOMMU bypass quirk feature.
75 * If set - use platform tools to detect the IOMMU.
77 * Note the reverse polarity (compared to most other features),
78 * this is for compatibility with legacy systems.
80 #define VIRTIO_F_IOMMU_PLATFORM (1ULL << 33)
83 * Some VirtIO feature bits (currently bits 28 through 34) are
84 * reserved for the transport being used (eg. virtio_ring), the
85 * rest are per-device feature bits.
87 #define VIRTIO_TRANSPORT_F_START 28
88 #define VIRTIO_TRANSPORT_F_END 34
90 #endif /* _VIRTIO_CONFIG_H_ */