1 /** @file
2 Event Channel function implementation.
3
4 Event channel are use to notify of an event that happened in a shared
5 structure for example.
6
7 Copyright (C) 2014, Citrix Ltd.
8
9 This program and the accompanying materials
10 are licensed and made available under the terms and conditions of the BSD License
11 which accompanies this distribution. The full text of the license may be found at
12 http://opensource.org/licenses/bsd-license.php
13
14 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
15 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
16
17 **/
18 #include "EventChannel.h"
19
20 #include <Library/XenHypercallLib.h>
21
22 UINT32
XenEventChannelNotify(IN XENBUS_DEVICE * Dev,IN evtchn_port_t Port)23 XenEventChannelNotify (
24 IN XENBUS_DEVICE *Dev,
25 IN evtchn_port_t Port
26 )
27 {
28 INTN ReturnCode;
29 evtchn_send_t Send;
30
31 Send.port = Port;
32 ReturnCode = XenHypercallEventChannelOp (EVTCHNOP_send, &Send);
33 return (UINT32)ReturnCode;
34 }
35
36 UINT32
37 EFIAPI
XenBusEventChannelAllocate(IN XENBUS_PROTOCOL * This,IN domid_t DomainId,OUT evtchn_port_t * Port)38 XenBusEventChannelAllocate (
39 IN XENBUS_PROTOCOL *This,
40 IN domid_t DomainId,
41 OUT evtchn_port_t *Port
42 )
43 {
44 evtchn_alloc_unbound_t Parameter;
45 UINT32 ReturnCode;
46
47 Parameter.dom = DOMID_SELF;
48 Parameter.remote_dom = DomainId;
49 ReturnCode = (UINT32)XenHypercallEventChannelOp (
50 EVTCHNOP_alloc_unbound,
51 &Parameter);
52 if (ReturnCode != 0) {
53 DEBUG ((EFI_D_ERROR, "ERROR: alloc_unbound failed with rc=%d", ReturnCode));
54 return ReturnCode;
55 }
56 *Port = Parameter.port;
57 return ReturnCode;
58 }
59
60 UINT32
61 EFIAPI
XenBusEventChannelNotify(IN XENBUS_PROTOCOL * This,IN evtchn_port_t Port)62 XenBusEventChannelNotify (
63 IN XENBUS_PROTOCOL *This,
64 IN evtchn_port_t Port
65 )
66 {
67 XENBUS_PRIVATE_DATA *Private;
68
69 Private = XENBUS_PRIVATE_DATA_FROM_THIS(This);
70 return XenEventChannelNotify (Private->Dev, Port);
71 }
72
73 UINT32
74 EFIAPI
XenBusEventChannelClose(IN XENBUS_PROTOCOL * This,IN evtchn_port_t Port)75 XenBusEventChannelClose (
76 IN XENBUS_PROTOCOL *This,
77 IN evtchn_port_t Port
78 )
79 {
80 evtchn_close_t Close;
81
82 Close.port = Port;
83 return (UINT32)XenHypercallEventChannelOp (EVTCHNOP_close, &Close);
84 }
85