Some ARCH need to use MMIO to access PCI IO, such as ARM AARCH64 RISC-V
and LOONGARCH64. In some drivers, a PCD value is added to determine
whether to use MMIO.

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4584

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Signed-off-by: Chao Li <lichao@loongson.cn>
---
 MdePkg/MdePkg.dec | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
index ac54338089..55f5230c31 100644
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -2018,6 +2018,12 @@
   # @Prompt Validate ORDERED_COLLECTION structure
   gEfiMdePkgTokenSpaceGuid.PcdValidateOrderedCollection|FALSE|BOOLEAN|0x0000002a
 
+  ## Indicates if PCI IO translation is used.
+  #   TRUE  - PCI IO translation is enable.
+  #   FALSE - PCI IO translation is disable.
+  # @Prompt Pci Io Translation Is Enabled.
+  gEfiMdePkgTokenSpaceGuid.PcdPciIoTranslationIsEnabled|FALSE|BOOLEAN|0x00000043
+
 [PcdsFixedAtBuild]
   ## Status code value for indicating a watchdog timer has expired.
   # EFI_COMPUTING_UNIT_HOST_PROCESSOR | EFI_CU_HP_EC_TIMER_EXPIRED
-- 
2.27.0



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