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01: #ifndef _LINUX_VIRTIO_CONFIG_H
02: #define _LINUX_VIRTIO_CONFIG_H
03: /* This header, excluding the #ifdef __KERNEL__ part, is BSD licensed so
04:  * anyone can use the definitions to implement compatible drivers/servers.
05:  *
06:  * Redistribution and use in source and binary forms, with or without
07:  * modification, are permitted provided that the following conditions
08:  * are met:
09:  * 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: #include <linux/types.h>
33: 
34: /* Status byte for guest to report progress, and synchronize features. */
35: /* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */
36: #define VIRTIO_CONFIG_S_ACKNOWLEDGE     1
37: /* We have found a driver for the device. */
38: #define VIRTIO_CONFIG_S_DRIVER          2
39: /* Driver has used its parts of the config, and is happy */
40: #define VIRTIO_CONFIG_S_DRIVER_OK       4
41: /* We've given up on this device. */
42: #define VIRTIO_CONFIG_S_FAILED          0x80
43: 
44: /* Some virtio feature bits (currently bits 28 through 31) are reserved for the
45:  * transport being used (eg. virtio_ring), the rest are per-device feature
46:  * bits. */
47: #define VIRTIO_TRANSPORT_F_START        28
48: #define VIRTIO_TRANSPORT_F_END          32
49: 
50: /* Do we get callbacks when the ring is completely used, even if we've
51:  * suppressed them? */
52: #define VIRTIO_F_NOTIFY_ON_EMPTY        24
53: 
54: #endif /* _LINUX_VIRTIO_CONFIG_H */
55: 

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