[Xen-devel] [PATCH v2 09/18] OvmfPkg/XenBusDxe: Add Event Channel Notify.

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

This first function is used to notify the other side that there is
something to do. The other side is another Xen domain.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>

---
Change in V2:
- file header
- coding style
- adding comment to functions
- Licenses
---
 OvmfPkg/XenBusDxe/EventChannel.c | 49 +++++++++++++++++++++++++++++++++++++++
 OvmfPkg/XenBusDxe/EventChannel.h | 50 ++++++++++++++++++++++++++++++++++++++++
 OvmfPkg/XenBusDxe/XenBusDxe.inf  |  2 ++
 3 files changed, 101 insertions(+)
 create mode 100644 OvmfPkg/XenBusDxe/EventChannel.c
 create mode 100644 OvmfPkg/XenBusDxe/EventChannel.h

diff --git a/OvmfPkg/XenBusDxe/EventChannel.c b/OvmfPkg/XenBusDxe/EventChannel.c
new file mode 100644
index 0000000..f34f9b8
--- /dev/null
+++ b/OvmfPkg/XenBusDxe/EventChannel.c
@@ -0,0 +1,49 @@
+/** @file
+  Event Channel function implementation.
+
+  Event channel are use to notify of an event that happend in a shared
+  structure for example.
+
+  Copyright (C) 2014, Citrix Ltd.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions
+  are met:
+
+  * Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+  * Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in
+    the documentation and/or other materials provided with the
+    distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+  COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+  ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+  POSSIBILITY OF SUCH DAMAGE.
+
+**/
+#include "EventChannel.h"
+#include "XenHypercall.h"
+
+VOID
+XenEventChannelNotify (
+  IN XENBUS_DEVICE *Dev,
+  IN evtchn_port_t Port
+  )
+{
+  INTN ReturnCode;
+  evtchn_send_t Send;
+
+  Send.port = Port;
+  ReturnCode = XenHypercallEventChannelOp (Dev, EVTCHNOP_send, &Send);
+  ASSERT (ReturnCode == 0);
+}
diff --git a/OvmfPkg/XenBusDxe/EventChannel.h b/OvmfPkg/XenBusDxe/EventChannel.h
new file mode 100644
index 0000000..fb2845b
--- /dev/null
+++ b/OvmfPkg/XenBusDxe/EventChannel.h
@@ -0,0 +1,50 @@
+/** @file
+  Event Channel function declaration.
+
+  Copyright (C) 2014, Citrix Ltd.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions
+  are met:
+
+  * Redistributions of source code must retain the above copyright
+    notice, this list of conditions and the following disclaimer.
+  * Redistributions in binary form must reproduce the above copyright
+    notice, this list of conditions and the following disclaimer in
+    the documentation and/or other materials provided with the
+    distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+  COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+  ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+  POSSIBILITY OF SUCH DAMAGE.
+
+**/
+#ifndef __XENBUS_EVENT_CHANNEL_H
+#define __XENBUS_EVENT_CHANNEL_H
+
+#include "XenBusDxe.h"
+
+#include <IndustryStandard/Xen/event_channel.h>
+
+/**
+  Send an event to the remote end of the channel whose local endpoint is Port.
+
+  @param Dev    A pointer to XENBUS_DEVICE.
+  @param Port   The port to notify.
+**/
+VOID
+XenEventChannelNotify (
+  IN XENBUS_DEVICE *Dev,
+  IN evtchn_port_t Port
+  );
+
+#endif
diff --git a/OvmfPkg/XenBusDxe/XenBusDxe.inf b/OvmfPkg/XenBusDxe/XenBusDxe.inf
index 1eca168..13623bd 100644
--- a/OvmfPkg/XenBusDxe/XenBusDxe.inf
+++ b/OvmfPkg/XenBusDxe/XenBusDxe.inf
@@ -36,6 +36,8 @@
   InterlockedCompareExchange16.h
   GrantTable.c
   GrantTable.h
+  EventChannel.c
+  EventChannel.h
 
 [Sources.X64]
   X64/hypercall.S
-- 
Anthony PERARD


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