[PATCH v2 2/5] MdeMoudlePkg: introduce new PCD for Acpi/rsdp

["Jianyong Wu" <jianyong.wu@arm.com>]

As there is lack of a machnism in Cloud Hypervisor to pass the base
address of Rsdp in Acpi, so a PCD varialbe is introduced here to
feed it.

Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Signed-off-by: Jianyong Wu <jianyong.wu@arm.com>
---
 MdeModulePkg/MdeModulePkg.dec | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec
index 148395511034..4c8baac35a9e 100644
--- a/MdeModulePkg/MdeModulePkg.dec
+++ b/MdeModulePkg/MdeModulePkg.dec
@@ -910,6 +910,13 @@ [PcdsFixedAtBuild]
   # @Expression 0x80000001 | (gEfiMdeModulePkgTokenSpaceGuid.PcdLoadModuleAtFixAddressEnable == 0xFFFFFFFFFFFFFFFF || gEfiMdeModulePkgTokenSpaceGuid.PcdLoadModuleAtFixAddressEnable <= 0x0FFFFFFFFFFFFFFF)
   gEfiMdeModulePkgTokenSpaceGuid.PcdLoadModuleAtFixAddressEnable|0|UINT64|0x30001015
 
+  ##
+  # This is the physical address of rsdp which is the core struct of Acpi.
+  # Some hypervisor may has no way to pass rsdp address to the guest, so a PCD
+  # is worth for those.
+  #
+  gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiRsdpBaseAddress|0x0|UINT64|0x30001056
+
   ## Progress Code for OS Loader LoadImage start.<BR><BR>
   #  PROGRESS_CODE_OS_LOADER_LOAD   = (EFI_SOFTWARE_DXE_BS_DRIVER | (EFI_OEM_SPECIFIC | 0x00000000)) = 0x03058000<BR>
   # @Prompt Progress Code for OS Loader LoadImage start.
-- 
2.17.1