Revision: 14417
http://sourceforge.net/p/edk2/code/14417
Author: jljusten
Date: 2013-06-14 07:40:47 +0000 (Fri, 14 Jun 2013)
Log Message:
-----------
OvmfPkg: VirtioNetDxe: WaitForPacket and EXIT_BOOT_SERVICES event callbacks
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <[email protected]>
Reviewed-by: Jordan Justen <[email protected]>
Reviewed-by: Stefan Hajnoczi <[email protected]>
Added Paths:
-----------
trunk/edk2/OvmfPkg/VirtioNetDxe/Events.c
Added: trunk/edk2/OvmfPkg/VirtioNetDxe/Events.c
===================================================================
--- trunk/edk2/OvmfPkg/VirtioNetDxe/Events.c (rev 0)
+++ trunk/edk2/OvmfPkg/VirtioNetDxe/Events.c 2013-06-14 07:40:47 UTC (rev
14417)
@@ -0,0 +1,90 @@
+/** @file
+
+ Implements
+ - the SNM.WaitForPacket EVT_NOTIFY_WAIT event,
+ - the EVT_SIGNAL_EXIT_BOOT_SERVICES event
+ for the virtio-net driver.
+
+ Copyright (C) 2013, Red Hat, Inc.
+ Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>
+
+ This program and the accompanying materials are licensed and made available
+ under the terms and conditions of the BSD License which accompanies this
+ distribution. The full text of the license may be found at
+ http://opensource.org/licenses/bsd-license.php
+
+ THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
+ WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include <Library/BaseLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+
+#include "VirtioNet.h"
+
+/**
+ Invoke a notification event
+
+ @param Event Event whose notification function is being
+ invoked.
+ @param Context The pointer to the notification function's
+ context, which is implementation-dependent.
+
+**/
+
+VOID
+EFIAPI
+VirtioNetIsPacketAvailable (
+ IN EFI_EVENT Event,
+ IN VOID *Context
+ )
+{
+ //
+ // This callback has been enqueued by an external application and is
+ // running at TPL_CALLBACK already.
+ //
+ // The WaitForPacket logic is similar to that of WaitForKey. The former has
+ // almost no documentation in either the UEFI-2.3.1+errC spec or the
+ // DWG-2.3.1, but WaitForKey does have some.
+ //
+ VNET_DEV *Dev;
+ UINT16 RxCurUsed;
+
+ Dev = Context;
+ if (Dev->Snm.State != EfiSimpleNetworkInitialized) {
+ return;
+ }
+
+ //
+ // virtio-0.9.5, 2.4.2 Receiving Used Buffers From the Device
+ //
+ MemoryFence ();
+ RxCurUsed = *Dev->RxRing.Used.Idx;
+
+ if (Dev->RxLastUsed != RxCurUsed) {
+ gBS->SignalEvent (&Dev->Snp.WaitForPacket);
+ }
+}
+
+VOID
+EFIAPI
+VirtioNetExitBoot (
+ IN EFI_EVENT Event,
+ IN VOID *Context
+ )
+{
+ //
+ // This callback has been enqueued by ExitBootServices() and is running at
+ // TPL_CALLBACK already.
+ //
+ // Shut down pending transfers according to DWG-2.3.1, "25.5.1 Exit Boot
+ // Services Event".
+ //
+ VNET_DEV *Dev;
+
+ Dev = Context;
+ if (Dev->Snm.State == EfiSimpleNetworkInitialized) {
+ VIRTIO_CFG_WRITE (Dev, Generic.VhdrDeviceStatus, 0);
+ }
+}
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