1 /*
2 * This library is free software; you can redistribute it and/or
3 * modify it under the terms of the GNU Lesser General Public
4 * License as published by the Free Software Foundation;
5 * version 2.1 of the License.
6 *
7 * This library is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
10 * Lesser General Public License for more details.
11 *
12 * You should have received a copy of the GNU Lesser General Public
13 * License along with this library; If not, see <http://www.gnu.org/licenses/>.
14 *
15 * Split out from xc_linus_osdep.c:
16 *
17 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
18 */
19
20 #include <errno.h>
21 #include <fcntl.h>
22 #include <unistd.h>
23 #include <stdlib.h>
24 #include <stdint.h>
25
26 #include <sys/ioctl.h>
27
28 #include <xen/xen.h>
29 #include <xen/sys/evtchn.h>
30
31 #include "private.h"
32
33 #ifndef O_CLOEXEC
34 #define O_CLOEXEC 0
35 #endif
36
osdep_evtchn_open(xenevtchn_handle * xce,unsigned int flags)37 int osdep_evtchn_open(xenevtchn_handle *xce, unsigned int flags)
38 {
39 int open_flags = O_RDWR;
40 int fd;
41
42 if ( !(flags & XENEVTCHN_NO_CLOEXEC) )
43 open_flags |= O_CLOEXEC;
44
45 fd = open("/dev/xen/evtchn", open_flags);
46 if ( fd == -1 )
47 return -1;
48
49 xce->fd = fd;
50
51 return 0;
52 }
53
osdep_evtchn_close(xenevtchn_handle * xce)54 int osdep_evtchn_close(xenevtchn_handle *xce)
55 {
56 if ( xce->fd == -1 )
57 return 0;
58
59 return close(xce->fd);
60 }
61
osdep_evtchn_restrict(xenevtchn_handle * xce,domid_t domid)62 int osdep_evtchn_restrict(xenevtchn_handle *xce, domid_t domid)
63 {
64 struct ioctl_evtchn_restrict_domid restrict_domid = { domid };
65
66 return ioctl(xce->fd, IOCTL_EVTCHN_RESTRICT_DOMID, &restrict_domid);
67 }
68
xenevtchn_notify(xenevtchn_handle * xce,evtchn_port_t port)69 int xenevtchn_notify(xenevtchn_handle *xce, evtchn_port_t port)
70 {
71 int fd = xce->fd;
72 struct ioctl_evtchn_notify notify;
73
74 notify.port = port;
75
76 return ioctl(fd, IOCTL_EVTCHN_NOTIFY, ¬ify);
77 }
78
xenevtchn_bind_unbound_port(xenevtchn_handle * xce,uint32_t domid)79 xenevtchn_port_or_error_t xenevtchn_bind_unbound_port(xenevtchn_handle *xce,
80 uint32_t domid)
81 {
82 int fd = xce->fd;
83 struct ioctl_evtchn_bind_unbound_port bind;
84
85 bind.remote_domain = domid;
86
87 return ioctl(fd, IOCTL_EVTCHN_BIND_UNBOUND_PORT, &bind);
88 }
89
xenevtchn_bind_interdomain(xenevtchn_handle * xce,uint32_t domid,evtchn_port_t remote_port)90 xenevtchn_port_or_error_t xenevtchn_bind_interdomain(xenevtchn_handle *xce,
91 uint32_t domid,
92 evtchn_port_t remote_port)
93 {
94 int fd = xce->fd;
95 struct ioctl_evtchn_bind_interdomain bind;
96
97 bind.remote_domain = domid;
98 bind.remote_port = remote_port;
99
100 return ioctl(fd, IOCTL_EVTCHN_BIND_INTERDOMAIN, &bind);
101 }
102
xenevtchn_bind_virq(xenevtchn_handle * xce,unsigned int virq)103 xenevtchn_port_or_error_t xenevtchn_bind_virq(xenevtchn_handle *xce,
104 unsigned int virq)
105 {
106 int fd = xce->fd;
107 struct ioctl_evtchn_bind_virq bind;
108
109 bind.virq = virq;
110
111 return ioctl(fd, IOCTL_EVTCHN_BIND_VIRQ, &bind);
112 }
113
xenevtchn_unbind(xenevtchn_handle * xce,evtchn_port_t port)114 int xenevtchn_unbind(xenevtchn_handle *xce, evtchn_port_t port)
115 {
116 int fd = xce->fd;
117 struct ioctl_evtchn_unbind unbind;
118
119 unbind.port = port;
120
121 return ioctl(fd, IOCTL_EVTCHN_UNBIND, &unbind);
122 }
123
xenevtchn_pending(xenevtchn_handle * xce)124 xenevtchn_port_or_error_t xenevtchn_pending(xenevtchn_handle *xce)
125 {
126 int fd = xce->fd;
127 evtchn_port_t port;
128
129 if ( read(fd, &port, sizeof(port)) != sizeof(port) )
130 return -1;
131
132 return port;
133 }
134
xenevtchn_unmask(xenevtchn_handle * xce,evtchn_port_t port)135 int xenevtchn_unmask(xenevtchn_handle *xce, evtchn_port_t port)
136 {
137 int fd = xce->fd;
138
139 if ( write(fd, &port, sizeof(port)) != sizeof(port) )
140 return -1;
141
142 return 0;
143 }
144
145 /*
146 * Local variables:
147 * mode: C
148 * c-file-style: "BSD"
149 * c-basic-offset: 4
150 * tab-width: 4
151 * indent-tabs-mode: nil
152 * End:
153 */
154