diff options
| author |   Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
|---|---|---|
| committer | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
| commit | af1a266670d040d2f4083ff309d732d648afba2a (patch) | |
| tree | 2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/edk2/OvmfPkg/VirtioNetDxe/Events.c | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/edk2/OvmfPkg/VirtioNetDxe/Events.c')
| -rw-r--r-- | roms/edk2/OvmfPkg/VirtioNetDxe/Events.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/roms/edk2/OvmfPkg/VirtioNetDxe/Events.c b/roms/edk2/OvmfPkg/VirtioNetDxe/Events.c new file mode 100644 index 000000000..83e96e5e5 --- /dev/null +++ b/roms/edk2/OvmfPkg/VirtioNetDxe/Events.c @@ -0,0 +1,86 @@ +/** @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>
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#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;
+ MemoryFence ();
+
+ 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;
+
+ DEBUG ((DEBUG_VERBOSE, "%a: Context=0x%p\n", __FUNCTION__, Context));
+ Dev = Context;
+ if (Dev->Snm.State == EfiSimpleNetworkInitialized) {
+ Dev->VirtIo->SetDeviceStatus (Dev->VirtIo, 0);
+ }
+}
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