OvmfPkg: Apply uncrustify changes

[mirror_edk2.git] / OvmfPkg / VirtioNetDxe / Events.c

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