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1 /******************************************************************************
2  * evtchn.h
3  *
4  * Interface to /dev/xen/evtchn.
5  *
6  * Copyright (c) 2003-2005, K A Fraser
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License version 2
10  * as published by the Free Software Foundation; or, when distributed
11  * separately from the Linux kernel or incorporated into other
12  * software packages, subject to the following license:
13  *
14  * Permission is hereby granted, free of charge, to any person obtaining a copy
15  * of this source file (the "Software"), to deal in the Software without
16  * restriction, including without limitation the rights to use, copy, modify,
17  * merge, publish, distribute, sublicense, and/or sell copies of the Software,
18  * and to permit persons to whom the Software is furnished to do so, subject to
19  * the following conditions:
20  *
21  * The above copyright notice and this permission notice shall be included in
22  * all copies or substantial portions of the Software.
23  *
24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
25  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
26  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
27  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
28  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
29  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
30  * IN THE SOFTWARE.
31  */
32 
33 #ifndef __LINUX_PUBLIC_EVTCHN_H__
34 #define __LINUX_PUBLIC_EVTCHN_H__
35 
36 /*
37  * Bind a fresh port to VIRQ @virq.
38  * Return allocated port.
39  */
40 #define IOCTL_EVTCHN_BIND_VIRQ				\
41 	_IOC(_IOC_NONE, 'E', 0, sizeof(struct ioctl_evtchn_bind_virq))
42 struct ioctl_evtchn_bind_virq {
43 	unsigned int virq;
44 };
45 
46 /*
47  * Bind a fresh port to remote <@remote_domain, @remote_port>.
48  * Return allocated port.
49  */
50 #define IOCTL_EVTCHN_BIND_INTERDOMAIN			\
51 	_IOC(_IOC_NONE, 'E', 1, sizeof(struct ioctl_evtchn_bind_interdomain))
52 struct ioctl_evtchn_bind_interdomain {
53 	unsigned int remote_domain, remote_port;
54 };
55 
56 /*
57  * Allocate a fresh port for binding to @remote_domain.
58  * Return allocated port.
59  */
60 #define IOCTL_EVTCHN_BIND_UNBOUND_PORT			\
61 	_IOC(_IOC_NONE, 'E', 2, sizeof(struct ioctl_evtchn_bind_unbound_port))
62 struct ioctl_evtchn_bind_unbound_port {
63 	unsigned int remote_domain;
64 };
65 
66 /*
67  * Unbind previously allocated @port.
68  */
69 #define IOCTL_EVTCHN_UNBIND				\
70 	_IOC(_IOC_NONE, 'E', 3, sizeof(struct ioctl_evtchn_unbind))
71 struct ioctl_evtchn_unbind {
72 	unsigned int port;
73 };
74 
75 /*
76  * Unbind previously allocated @port.
77  */
78 #define IOCTL_EVTCHN_NOTIFY				\
79 	_IOC(_IOC_NONE, 'E', 4, sizeof(struct ioctl_evtchn_notify))
80 struct ioctl_evtchn_notify {
81 	unsigned int port;
82 };
83 
84 /* Clear and reinitialise the event buffer. Clear error condition. */
85 #define IOCTL_EVTCHN_RESET				\
86 	_IOC(_IOC_NONE, 'E', 5, 0)
87 
88 /*
89  * Restrict this file descriptor so that it can only be used to bind
90  * new interdomain events from one domain.
91  *
92  * Once a file descriptor has been restricted it cannot be
93  * de-restricted, and must be closed and re-opened.  Event channels
94  * which were bound before restricting remain bound afterwards, and
95  * can be notified as usual.
96  */
97 #define IOCTL_EVTCHN_RESTRICT_DOMID			\
98 	_IOC(_IOC_NONE, 'E', 6, sizeof(struct ioctl_evtchn_restrict_domid))
99 struct ioctl_evtchn_restrict_domid {
100 	domid_t domid;
101 };
102 
103 #endif /* __LINUX_PUBLIC_EVTCHN_H__ */
104