1 /******************************************************************************
2  * evtchn.h
3  *
4  * Interface to /dev/xen/evtchn.
5  *
6  * Copyright (c) 2003-2005, K A Fraser
7  *
8  * This file may be distributed separately from the Linux kernel, or
9  * incorporated into other software packages, subject to the following license:
10  *
11  * Permission is hereby granted, free of charge, to any person obtaining a copy
12  * of this source file (the "Software"), to deal in the Software without
13  * restriction, including without limitation the rights to use, copy, modify,
14  * merge, publish, distribute, sublicense, and/or sell copies of the Software,
15  * and to permit persons to whom the Software is furnished to do so, subject to
16  * the following conditions:
17  *
18  * The above copyright notice and this permission notice shall be included in
19  * all copies or substantial portions of the Software.
20  *
21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
24  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
25  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
26  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
27  * IN THE SOFTWARE.
28  */
29 
30 #ifndef _XEN_SYS_EVTCHN_H
31 #define _XEN_SYS_EVTCHN_H
32 
33 #define	_IOC_NONE	0
34 #define	_IOC(flag, letter, inum, size)	((letter) << 8 | (inum))
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  * Notify the given @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 #endif /* _XEN_SYS_EVTCHN_H */
85 
86 /*
87  * Local variables:
88  *  mode: C
89  *  c-file-style: "linux"
90  *  indent-tabs-mode: t
91  *  c-basic-offset: 8
92  *  tab-width: 8
93  * End:
94  */
95