1 files changed, 58 insertions, 0 deletions
diff --git a/roms/edk2/OvmfPkg/VirtioNetDxe/SnpStart.c b/roms/edk2/OvmfPkg/VirtioNetDxe/SnpStart.c
new file mode 100644
index 000000000..b8161fbe3
--- /dev/null
+++ b/roms/edk2/OvmfPkg/VirtioNetDxe/SnpStart.c
@@ -0,0 +1,58 @@
+/** @file
+
+  Implementation of the SNP.Start() function and its private helpers if any.
+
+  Copyright (C) 2013, Red Hat, Inc.
+  Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Library/UefiBootServicesTableLib.h>
+
+#include "VirtioNet.h"
+
+/**
+  Changes the state of a network interface from "stopped" to "started".
+
+  @param  This Protocol instance pointer.
+
+  @retval EFI_SUCCESS           The network interface was started.
+  @retval EFI_ALREADY_STARTED   The network interface is already in the started
+                                state.
+  @retval EFI_INVALID_PARAMETER One or more of the parameters has an
+                                unsupported value.
+  @retval EFI_DEVICE_ERROR      The command could not be sent to the network
+                                interface.
+  @retval EFI_UNSUPPORTED       This function is not supported by the network
+                                interface.
+**/
+
+EFI_STATUS
+EFIAPI
+VirtioNetStart (
+  IN EFI_SIMPLE_NETWORK_PROTOCOL *This
+  )
+{
+  VNET_DEV   *Dev;
+  EFI_TPL    OldTpl;
+  EFI_STATUS Status;
+
+  if (This == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  Dev = VIRTIO_NET_FROM_SNP (This);
+  OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
+  if (Dev->Snm.State != EfiSimpleNetworkStopped) {
+    Status = EFI_ALREADY_STARTED;
+  }
+  else {
+    Dev->Snm.State = EfiSimpleNetworkStarted;
+    Status = EFI_SUCCESS;
+  }
+
+  gBS->RestoreTPL (OldTpl);
+  return Status;
+}