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1 | /****************************************************************************** |
2 | * event_channel.h | |
3 | * | |
4 | * Event channels between domains. | |
5 | * | |
6 | * Copyright (c) 2003-2004, K A Fraser. | |
7 | */ | |
8 | ||
9 | #ifndef __XEN_PUBLIC_EVENT_CHANNEL_H__ | |
10 | #define __XEN_PUBLIC_EVENT_CHANNEL_H__ | |
11 | ||
ecbf29cd JF |
12 | #include <xen/interface/xen.h> |
13 | ||
a42089dd JF |
14 | typedef uint32_t evtchn_port_t; |
15 | DEFINE_GUEST_HANDLE(evtchn_port_t); | |
16 | ||
17 | /* | |
18 | * EVTCHNOP_alloc_unbound: Allocate a port in domain <dom> and mark as | |
19 | * accepting interdomain bindings from domain <remote_dom>. A fresh port | |
20 | * is allocated in <dom> and returned as <port>. | |
21 | * NOTES: | |
22 | * 1. If the caller is unprivileged then <dom> must be DOMID_SELF. | |
23 | * 2. <rdom> may be DOMID_SELF, allowing loopback connections. | |
24 | */ | |
25 | #define EVTCHNOP_alloc_unbound 6 | |
26 | struct evtchn_alloc_unbound { | |
27 | /* IN parameters */ | |
28 | domid_t dom, remote_dom; | |
29 | /* OUT parameters */ | |
30 | evtchn_port_t port; | |
31 | }; | |
32 | ||
33 | /* | |
34 | * EVTCHNOP_bind_interdomain: Construct an interdomain event channel between | |
35 | * the calling domain and <remote_dom>. <remote_dom,remote_port> must identify | |
36 | * a port that is unbound and marked as accepting bindings from the calling | |
37 | * domain. A fresh port is allocated in the calling domain and returned as | |
38 | * <local_port>. | |
39 | * NOTES: | |
40 | * 2. <remote_dom> may be DOMID_SELF, allowing loopback connections. | |
41 | */ | |
42 | #define EVTCHNOP_bind_interdomain 0 | |
43 | struct evtchn_bind_interdomain { | |
44 | /* IN parameters. */ | |
45 | domid_t remote_dom; | |
46 | evtchn_port_t remote_port; | |
47 | /* OUT parameters. */ | |
48 | evtchn_port_t local_port; | |
49 | }; | |
50 | ||
51 | /* | |
52 | * EVTCHNOP_bind_virq: Bind a local event channel to VIRQ <irq> on specified | |
53 | * vcpu. | |
54 | * NOTES: | |
55 | * 1. A virtual IRQ may be bound to at most one event channel per vcpu. | |
56 | * 2. The allocated event channel is bound to the specified vcpu. The binding | |
57 | * may not be changed. | |
58 | */ | |
59 | #define EVTCHNOP_bind_virq 1 | |
60 | struct evtchn_bind_virq { | |
61 | /* IN parameters. */ | |
62 | uint32_t virq; | |
63 | uint32_t vcpu; | |
64 | /* OUT parameters. */ | |
65 | evtchn_port_t port; | |
66 | }; | |
67 | ||
68 | /* | |
69 | * EVTCHNOP_bind_pirq: Bind a local event channel to PIRQ <irq>. | |
70 | * NOTES: | |
71 | * 1. A physical IRQ may be bound to at most one event channel per domain. | |
72 | * 2. Only a sufficiently-privileged domain may bind to a physical IRQ. | |
73 | */ | |
74 | #define EVTCHNOP_bind_pirq 2 | |
75 | struct evtchn_bind_pirq { | |
76 | /* IN parameters. */ | |
77 | uint32_t pirq; | |
78 | #define BIND_PIRQ__WILL_SHARE 1 | |
79 | uint32_t flags; /* BIND_PIRQ__* */ | |
80 | /* OUT parameters. */ | |
81 | evtchn_port_t port; | |
82 | }; | |
83 | ||
84 | /* | |
85 | * EVTCHNOP_bind_ipi: Bind a local event channel to receive events. | |
86 | * NOTES: | |
87 | * 1. The allocated event channel is bound to the specified vcpu. The binding | |
88 | * may not be changed. | |
89 | */ | |
90 | #define EVTCHNOP_bind_ipi 7 | |
91 | struct evtchn_bind_ipi { | |
92 | uint32_t vcpu; | |
93 | /* OUT parameters. */ | |
94 | evtchn_port_t port; | |
95 | }; | |
96 | ||
97 | /* | |
98 | * EVTCHNOP_close: Close a local event channel <port>. If the channel is | |
99 | * interdomain then the remote end is placed in the unbound state | |
100 | * (EVTCHNSTAT_unbound), awaiting a new connection. | |
101 | */ | |
102 | #define EVTCHNOP_close 3 | |
103 | struct evtchn_close { | |
104 | /* IN parameters. */ | |
105 | evtchn_port_t port; | |
106 | }; | |
107 | ||
108 | /* | |
109 | * EVTCHNOP_send: Send an event to the remote end of the channel whose local | |
110 | * endpoint is <port>. | |
111 | */ | |
112 | #define EVTCHNOP_send 4 | |
113 | struct evtchn_send { | |
114 | /* IN parameters. */ | |
115 | evtchn_port_t port; | |
116 | }; | |
117 | ||
118 | /* | |
119 | * EVTCHNOP_status: Get the current status of the communication channel which | |
120 | * has an endpoint at <dom, port>. | |
121 | * NOTES: | |
122 | * 1. <dom> may be specified as DOMID_SELF. | |
123 | * 2. Only a sufficiently-privileged domain may obtain the status of an event | |
124 | * channel for which <dom> is not DOMID_SELF. | |
125 | */ | |
126 | #define EVTCHNOP_status 5 | |
127 | struct evtchn_status { | |
128 | /* IN parameters */ | |
129 | domid_t dom; | |
130 | evtchn_port_t port; | |
131 | /* OUT parameters */ | |
132 | #define EVTCHNSTAT_closed 0 /* Channel is not in use. */ | |
133 | #define EVTCHNSTAT_unbound 1 /* Channel is waiting interdom connection.*/ | |
134 | #define EVTCHNSTAT_interdomain 2 /* Channel is connected to remote domain. */ | |
135 | #define EVTCHNSTAT_pirq 3 /* Channel is bound to a phys IRQ line. */ | |
136 | #define EVTCHNSTAT_virq 4 /* Channel is bound to a virtual IRQ line */ | |
137 | #define EVTCHNSTAT_ipi 5 /* Channel is bound to a virtual IPI line */ | |
138 | uint32_t status; | |
139 | uint32_t vcpu; /* VCPU to which this channel is bound. */ | |
140 | union { | |
141 | struct { | |
142 | domid_t dom; | |
143 | } unbound; /* EVTCHNSTAT_unbound */ | |
144 | struct { | |
145 | domid_t dom; | |
146 | evtchn_port_t port; | |
147 | } interdomain; /* EVTCHNSTAT_interdomain */ | |
148 | uint32_t pirq; /* EVTCHNSTAT_pirq */ | |
149 | uint32_t virq; /* EVTCHNSTAT_virq */ | |
150 | } u; | |
151 | }; | |
152 | ||
153 | /* | |
154 | * EVTCHNOP_bind_vcpu: Specify which vcpu a channel should notify when an | |
155 | * event is pending. | |
156 | * NOTES: | |
157 | * 1. IPI- and VIRQ-bound channels always notify the vcpu that initialised | |
158 | * the binding. This binding cannot be changed. | |
159 | * 2. All other channels notify vcpu0 by default. This default is set when | |
160 | * the channel is allocated (a port that is freed and subsequently reused | |
161 | * has its binding reset to vcpu0). | |
162 | */ | |
163 | #define EVTCHNOP_bind_vcpu 8 | |
164 | struct evtchn_bind_vcpu { | |
165 | /* IN parameters. */ | |
166 | evtchn_port_t port; | |
167 | uint32_t vcpu; | |
168 | }; | |
169 | ||
170 | /* | |
171 | * EVTCHNOP_unmask: Unmask the specified local event-channel port and deliver | |
172 | * a notification to the appropriate VCPU if an event is pending. | |
173 | */ | |
174 | #define EVTCHNOP_unmask 9 | |
175 | struct evtchn_unmask { | |
176 | /* IN parameters. */ | |
177 | evtchn_port_t port; | |
178 | }; | |
179 | ||
180 | struct evtchn_op { | |
181 | uint32_t cmd; /* EVTCHNOP_* */ | |
182 | union { | |
183 | struct evtchn_alloc_unbound alloc_unbound; | |
184 | struct evtchn_bind_interdomain bind_interdomain; | |
185 | struct evtchn_bind_virq bind_virq; | |
186 | struct evtchn_bind_pirq bind_pirq; | |
187 | struct evtchn_bind_ipi bind_ipi; | |
188 | struct evtchn_close close; | |
189 | struct evtchn_send send; | |
190 | struct evtchn_status status; | |
191 | struct evtchn_bind_vcpu bind_vcpu; | |
192 | struct evtchn_unmask unmask; | |
193 | } u; | |
194 | }; | |
195 | DEFINE_GUEST_HANDLE_STRUCT(evtchn_op); | |
196 | ||
197 | #endif /* __XEN_PUBLIC_EVENT_CHANNEL_H__ */ |