Events.c

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#include <Library/BaseLib.h>
#include <Library/UefiBootServicesTableLib.h>
 
#include "VirtioNet.h"
 
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", __func__, Context));
  Dev = Context;
  if (Dev->Snm.State == EfiSimpleNetworkInitialized) {
    Dev->VirtIo->SetDeviceStatus (Dev->VirtIo, 0);
  }
}