ArmVirtPkg/ArmVirtXen: Add ACPI support for Virt Xen ARM

Add ACPI support for Virt Xen ARM and only for aarch64. It gets the
ACPI tables through Xen ARM multiboot protocol.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

ArmVirtPkg/XenAcpiPlatformDxe/XenAcpiPlatformDxe.inf

@@ -0,0 +1,50 @@
+## @file
+#  Xen ARM ACPI Platform Driver using Xen ARM multiboot protocol
+#
+#  Copyright (C) 2016, Linaro Ltd. All rights reserved.
+#
+#  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                      = XenAcpiPlatformDxe
+  FILE_GUID                      = 0efc6282-f1e5-469a-8a70-194a8761f9aa
+  MODULE_TYPE                    = DXE_DRIVER
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = XenAcpiPlatformEntryPoint
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+#  VALID_ARCHITECTURES           = AARCH64
+#
+
+[Sources]
+  XenAcpiPlatformDxe.c
+
+[Packages]
+  ArmVirtPkg/ArmVirtPkg.dec
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+
+[LibraryClasses]
+  BaseLib
+  DebugLib
+  UefiBootServicesTableLib
+  UefiDriverEntryPoint
+
+[Protocols]
+  gEfiAcpiTableProtocolGuid                     ## PROTOCOL ALWAYS_CONSUMED
+  gFdtClientProtocolGuid                        ## CONSUMES
+
+[Depex]
+  gFdtClientProtocolGuid    AND
+  gEfiAcpiTableProtocolGuid