/** @file
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Implements
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- the SNM.WaitForPacket EVT_NOTIFY_WAIT event,
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- the EVT_SIGNAL_EXIT_BOOT_SERVICES event
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for the virtio-net driver.
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Copyright (C) 2013, Red Hat, Inc.
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Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Library/BaseLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include "VirtioNet.h"
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/**
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Invoke a notification event
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@param Event Event whose notification function is being
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invoked.
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@param Context The pointer to the notification function's
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context, which is implementation-dependent.
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**/
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VOID
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EFIAPI
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VirtioNetIsPacketAvailable (
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IN EFI_EVENT Event,
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IN VOID *Context
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)
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{
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//
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// This callback has been enqueued by an external application and is
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// running at TPL_CALLBACK already.
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//
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// The WaitForPacket logic is similar to that of WaitForKey. The former has
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// almost no documentation in either the UEFI-2.3.1+errC spec or the
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// DWG-2.3.1, but WaitForKey does have some.
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//
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VNET_DEV *Dev;
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UINT16 RxCurUsed;
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Dev = Context;
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if (Dev->Snm.State != EfiSimpleNetworkInitialized) {
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return;
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}
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//
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// virtio-0.9.5, 2.4.2 Receiving Used Buffers From the Device
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//
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MemoryFence ();
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RxCurUsed = *Dev->RxRing.Used.Idx;
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MemoryFence ();
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if (Dev->RxLastUsed != RxCurUsed) {
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gBS->SignalEvent (Dev->Snp.WaitForPacket);
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}
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}
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VOID
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EFIAPI
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VirtioNetExitBoot (
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IN EFI_EVENT Event,
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IN VOID *Context
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)
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{
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//
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// This callback has been enqueued by ExitBootServices() and is running at
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// TPL_CALLBACK already.
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//
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// Shut down pending transfers according to DWG-2.3.1, "25.5.1 Exit Boot
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// Services Event".
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//
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VNET_DEV *Dev;
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DEBUG ((DEBUG_VERBOSE, "%a: Context=0x%p\n", __FUNCTION__, Context));
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Dev = Context;
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if (Dev->Snm.State == EfiSimpleNetworkInitialized) {
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Dev->VirtIo->SetDeviceStatus (Dev->VirtIo, 0);
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}
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}
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