Add generic SerialPortLib instance for 16550 UARTs configured through PCDs. Depends on new library class called PlatformHookLib to perform platform specific initialization of the UART.

Add PlatformHookLib.h that defines the PlatformHookLib class
Add PlatformHookLibNull instance that is a Null implementation of the PlatformHookLib class





git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11184 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Library/BasePlatformHookLibNull/BasePlatformHookLibNull.c

@@ -0,0 +1,37 @@
+/** @file
+  Null Platform Hook Library instance.
+
+  Copyright (c) 2010, 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 <Base.h>
+#include <Library/PlatformHookLib.h>
+
+/**
+  Performs platform specific initialization required for the CPU to access
+  the hardware associated with a SerialPortLib instance.  This function does
+  not intiailzie the serial port hardware itself.  Instead, it initializes 
+  hardware devices that are required for the CPU to access the serial port 
+  hardware.  This function may be called more than once.
+
+  @retval RETURN_SUCCESS       The platform specific initialization succeeded.
+  @retval RETURN_DEVICE_ERROR  The platform specific initialization could not be completed.
+ 
+**/
+RETURN_STATUS
+EFIAPI
+PlatformHookSerialPortInitialize (
+  VOID
+  )
+{
+  return  RETURN_SUCCESS;
+}
+

MdeModulePkg/Library/BasePlatformHookLibNull/BasePlatformHookLibNull.inf

@@ -0,0 +1,34 @@
+## @file
+#  Null Platform Hook Library instance.
+#
+#  Copyright (c) 2010, 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.
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = BasePlatformHookLibNull
+  FILE_GUID                      = EBC3AEAD-CC13-49b0-A678-5BED93956955
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = PlatformHookLib
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+#  VALID_ARCHITECTURES           = IA32 X64 IPF EBC
+#
+
+[Sources]
+  BasePlatformHookLibNull.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec