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| author | Laszlo Ersek <lersek@redhat.com> | 2013-06-14 07:40:47 +0000 |
|---|---|---|
| committer | jljusten <jljusten@6f19259b-4bc3-4df7-8a09-765794883524> | 2013-06-14 07:40:47 +0000 |
| commit | 38f52db9c924af7970582d6b84544cfb48846417 (patch) | |
| tree | 9beaecf3081d1d22943b70aecd1f55b9811bfab9 /OvmfPkg/VirtioNetDxe | |
| parent | d0e5ff0a0d7dfb78b87503c05dd3517930523d01 (diff) | |
| download | edk2-platforms-38f52db9c924af7970582d6b84544cfb48846417.tar.xz | |
OvmfPkg: VirtioNetDxe: WaitForPacket and EXIT_BOOT_SERVICES event callbacks
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14417 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'OvmfPkg/VirtioNetDxe')
| -rw-r--r-- | OvmfPkg/VirtioNetDxe/Events.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/OvmfPkg/VirtioNetDxe/Events.c b/OvmfPkg/VirtioNetDxe/Events.c new file mode 100644 index 0000000000..3a5b6b492e --- /dev/null +++ b/OvmfPkg/VirtioNetDxe/Events.c @@ -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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