virtio_config.h revision 266951 
1/*-
2 * This header is BSD licensed so anyone can use the definitions to implement
3 * compatible drivers/servers.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of IBM nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD: head/sys/dev/virtio/virtio_config.h 266951 2014-06-01 18:16:01Z bryanv $
29 */
30
31#ifndef _VIRTIO_CONFIG_H_
32#define _VIRTIO_CONFIG_H_
33
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
40
41/*
42 * Generate interrupt when the virtqueue ring is
43 * completely used, even if we've suppressed them.
44 */
45#define VIRTIO_F_NOTIFY_ON_EMPTY (1 << 24)
46
47/*
48 * The guest should never negotiate this feature; it
49 * is used to detect faulty drivers.
50 */
51#define VIRTIO_F_BAD_FEATURE (1 << 30)
52
53/*
54 * Some VirtIO feature bits (currently bits 28 through 31) are
55 * reserved for the transport being used (eg. virtio_ring), the
56 * rest are per-device feature bits.
57 */
58#define VIRTIO_TRANSPORT_F_START	28
59#define VIRTIO_TRANSPORT_F_END		32
60
61#endif /* _VIRTIO_CONFIG_H_ */
62