xref: /titanic_52/usr/src/uts/common/xen/public/io/xenbus.h (revision b6c3f7863936abeae522e48a13887dddeb691a45)
1 /*****************************************************************************
2  * xenbus.h
3  *
4  * Xenbus protocol details.
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a copy
7  * of this software and associated documentation files (the "Software"), to
8  * deal in the Software without restriction, including without limitation the
9  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10  * sell copies of the Software, and to permit persons to whom the Software is
11  * furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22  * DEALINGS IN THE SOFTWARE.
23  *
24  * Copyright (C) 2005 XenSource Ltd.
25  */
26 
27 #ifndef _XEN_PUBLIC_IO_XENBUS_H
28 #define _XEN_PUBLIC_IO_XENBUS_H
29 
30 /*
31  * The state of either end of the Xenbus, i.e. the current communication
32  * status of initialisation across the bus.  States here imply nothing about
33  * the state of the connection between the driver and the kernel's device
34  * layers.
35  */
36 enum xenbus_state {
37     XenbusStateUnknown       = 0,
38 
39     XenbusStateInitialising  = 1,
40 
41     /*
42      * InitWait: Finished early initialisation but waiting for information
43      * from the peer or hotplug scripts.
44      */
45     XenbusStateInitWait      = 2,
46 
47     /*
48      * Initialised: Waiting for a connection from the peer.
49      */
50     XenbusStateInitialised   = 3,
51 
52     XenbusStateConnected     = 4,
53 
54     /*
55      * Closing: The device is being closed due to an error or an unplug event.
56      */
57     XenbusStateClosing       = 5,
58 
59     XenbusStateClosed        = 6
60 };
61 typedef enum xenbus_state XenbusState;
62 
63 #endif /* _XEN_PUBLIC_IO_XENBUS_H */
64 
65 /*
66  * Local variables:
67  * mode: C
68  * c-set-style: "BSD"
69  * c-basic-offset: 4
70  * tab-width: 4
71  * indent-tabs-mode: nil
72  * End:
73  */
74