ReactOS  0.4.15-dev-1068-g467feb9
virtio_config.h
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1 #ifndef _UAPI_LINUX_VIRTIO_CONFIG_H
2 #define _UAPI_LINUX_VIRTIO_CONFIG_H
3 /* This header, excluding the #ifdef __KERNEL__ part, is BSD licensed so
4  * anyone can use the definitions to implement compatible drivers/servers.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  * notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  * notice, this list of conditions and the following disclaimer in the
13  * documentation and/or other materials provided with the distribution.
14  * 3. Neither the name of IBM nor the names of its contributors
15  * may be used to endorse or promote products derived from this software
16  * without specific prior written permission.
17  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE. */
28 
29 /* Virtio devices use a standardized configuration space to define their
30  * features and pass configuration information, but each implementation can
31  * store and access that space differently. */
32 
33 /* Status byte for guest to report progress, and synchronize features. */
34 /* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */
35 #define VIRTIO_CONFIG_S_ACKNOWLEDGE 1
36 /* We have found a driver for the device. */
37 #define VIRTIO_CONFIG_S_DRIVER 2
38 /* Driver has used its parts of the config, and is happy */
39 #define VIRTIO_CONFIG_S_DRIVER_OK 4
40 /* Driver has finished configuring features */
41 #define VIRTIO_CONFIG_S_FEATURES_OK 8
42 /* Device entered invalid state, driver SHOULD reset it */
43 #define VIRTIO_CONFIG_S_NEEDS_RESET 0x40
44 /* We've given up on this device. */
45 #define VIRTIO_CONFIG_S_FAILED 0x80
46 /* virtio library features bits */
47 
48 
49 /* Some virtio feature bits (currently bits 28 through 31) are reserved for the
50  * transport being used (eg. virtio_ring), the rest are per-device feature
51  * bits. */
52 #define VIRTIO_TRANSPORT_F_START 28
53 #define VIRTIO_TRANSPORT_F_END 32
54 
55 /* Do we get callbacks when the ring is completely used, even if we've
56  * suppressed them? */
57 #define VIRTIO_F_NOTIFY_ON_EMPTY 24
58 
59 /* Can the device handle any descriptor layout? */
60 #define VIRTIO_F_ANY_LAYOUT 27
61 
62 /* v1.0 compliant. */
63 #define VIRTIO_F_VERSION_1 32
64 
65 #define VIRTIO_F_IOMMU_PLATFORM 33
66 
67 /* This feature indicates support for the packed virtqueue layout. */
68 #define VIRTIO_F_RING_PACKED 34
69 
70 // if this number is not equal to desc size, queue creation fails
71 #define SIZE_OF_SINGLE_INDIRECT_DESC 16
72 
73 #endif /* _UAPI_LINUX_VIRTIO_CONFIG_H */