MdeModulePkg: Add BdsDxe driver and PlatformBootManagerNull library.

BdsDxe driver links to UefiBootManagerLib and PlatformBootManager to
provide a pure UEFI boot manager conforming to the UEFI spec.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17328 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Library/PlatformBootManagerLibNull/PlatformBootManager.c

@@ -0,0 +1,67 @@
+/** @file
+  This file include all platform action which can be customized
+  by IBV/OEM.
+
+Copyright (c) 2012 - 2015, Intel Corporation. All rights reserved.<BR>
+This program and the accompanying materials
+are licensed and made available under the terms and conditions of the BSD License
+which accompanies this distribution.  The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include <Library/PlatformBootManagerLib.h>
+
+
+/**
+  Do the platform specific action before the console is connected.
+
+  Such as:
+    Update console variable;
+    Register new Driver#### or Boot####;
+    Signal ReadyToLock event.
+**/
+VOID
+EFIAPI
+PlatformBootManagerBeforeConsole (
+  VOID
+  )
+{
+  return;
+}
+
+/**
+  Do the platform specific action after the console is connected.
+
+  Such as:
+    Dynamically switch output mode;
+    Signal console ready platform customized event;
+    Run diagnostics like memory testing;
+    Connect certain devices;
+    Dispatch aditional option roms.
+**/
+VOID
+EFIAPI
+PlatformBootManagerAfterConsole (
+  VOID
+  )
+{
+  return;
+}
+
+/**
+  This function is called each second during the boot manager waits the timeout.
+
+  @param TimeoutRemain  The remaining timeout.
+**/
+VOID
+EFIAPI
+PlatformBootManagerWaitCallback (
+  UINT16          TimeoutRemain
+  )
+{
+  return;
+}