diff --git a/MdePkg/Include/IndustryStandard/IoRemappingTable.h b/MdePkg/Include/IndustryStandard/IoRemappingTable.h
new file mode 100644
index 000000000000..310819b03ff5
--- /dev/null
+++ b/MdePkg/Include/IndustryStandard/IoRemappingTable.h
@@ -0,0 +1,183 @@
+/** @file
+  ACPI IO Remapping Table (IORT) as specified in ARM spec DEN0049B
+
+  http://infocenter.arm.com/help/topic/com.arm.doc.den0049b/DEN0049B_IO_Remapping_Table.pdf
+
+  Copyright (c) 2017, Linaro Limited. 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.
+**/
+
+#ifndef __IO_REMAPPING_TABLE_H__
+#define __IO_REMAPPING_TABLE_H__
+
+#include <IndustryStandard/Acpi.h>
+
+#define EFI_ACPI_IO_REMAPPING_TABLE_REVISION        0x0
+
+#define EFI_ACPI_IORT_TYPE_ITS_GROUP                0x0
+#define EFI_ACPI_IORT_TYPE_NAMED_COMP               0x1
+#define EFI_ACPI_IORT_TYPE_ROOT_COMPLEX             0x2
+#define EFI_ACPI_IORT_TYPE_SMMUv1v2                 0x3
+#define EFI_ACPI_IORT_TYPE_SMMUv3                   0x4
+
+#define EFI_ACPI_IORT_MEM_ACCESS_PROP_CCA           BIT0
+
+#define EFI_ACPI_IORT_MEM_ACCESS_PROP_AH_TR         BIT0
+#define EFI_ACPI_IORT_MEM_ACCESS_PROP_AH_WA         BIT1
+#define EFI_ACPI_IORT_MEM_ACCESS_PROP_AH_RA         BIT2
+#define EFI_ACPI_IORT_MEM_ACCESS_PROP_AH_AHO        BIT3
+
+#define EFI_ACPI_IORT_MEM_ACCESS_FLAGS_CPM          BIT0
+#define EFI_ACPI_IORT_MEM_ACCESS_FLAGS_DACS         BIT1
+
+#define EFI_ACPI_IORT_SMMUv1v2_MODEL_v1             0x0
+#define EFI_ACPI_IORT_SMMUv1v2_MODEL_v2             0x1
+#define EFI_ACPI_IORT_SMMUv1v2_MODEL_MMU400         0x2
+#define EFI_ACPI_IORT_SMMUv1v2_MODEL_MMU500         0x3
+
+#define EFI_ACPI_IORT_SMMUv1v2_FLAG_DVM             BIT0
+#define EFI_ACPI_IORT_SMMUv1v2_FLAG_COH_WALK        BIT1
+
+#define EFI_ACPI_IORT_SMMUv1v2_INT_FLAG_LEVEL       0x0
+#define EFI_ACPI_IORT_SMMUv1v2_INT_FLAG_EDGE        0x1
+
+#define EFI_ACPI_IORT_SMMUv3_FLAG_COHAC_OVERRIDE    BIT0
+#define EFI_ACPI_IORT_SMMUv3_FLAG_HTTU_OVERRIDE     BIT1
+
+#define EFI_ACPI_IORT_ROOT_COMPLEX_ATS_UNSUPPORTED  0x0
+#define EFI_ACPI_IORT_ROOT_COMPLEX_ATS_SUPPORTED    0x1
+
+#define EFI_ACPI_IORT_ID_MAPPING_FLAGS_SINGLE       BIT0
+
+#pragma pack(1)
+
+///
+/// Table header
+///
+typedef struct {
+  EFI_ACPI_DESCRIPTION_HEADER             Header;
+  INT32                                   NumNodes;
+  INT32                                   NodeOffset;
+  INT32                                   Reserved;
+} EFI_ACPI_6_0_IO_REMAPPING_TABLE;
+
+///
+/// Definition for ID mapping table shared by all node types
+///
+typedef struct {
+  UINT32                                  InputBase;
+  UINT32                                  NumIds;
+  UINT32                                  OutputBase;
+  UINT32                                  OutputReference;
+  UINT32                                  Flags;
+} EFI_ACPI_6_0_IO_REMAPPING_ID_TABLE;
+
+///
+/// Node header definition shared by all node types
+///
+typedef struct {
+  UINT8                                   Type;
+  UINT16                                  Length;
+  UINT8                                   Revision;
+  UINT32                                  Reserved;
+  UINT32                                  NumIdMappings;
+  UINT32                                  IdReference;
+} EFI_ACPI_6_0_IO_REMAPPING_NODE;
+
+///
+/// Node type 0: ITS node
+///
+typedef struct {
+  EFI_ACPI_6_0_IO_REMAPPING_NODE          Node;
+
+  UINT32                                  NumItsIdentifiers;
+//UINT32                                  ItsIdentifiers[NumItsIdentifiers];
+} EFI_ACPI_6_0_IO_REMAPPING_ITS_NODE;
+
+///
+/// Node type 1: root complex node
+///
+typedef struct {
+  EFI_ACPI_6_0_IO_REMAPPING_NODE          Node;
+
+  UINT32                                  CacheCoherent;
+  UINT8                                   AllocationHints;
+  UINT16                                  Reserved;
+  UINT8                                   MemoryAccessFlags;
+
+  UINT32                                  AtsAttribute;
+  UINT32                                  PciSegmentNumber;
+} EFI_ACPI_6_0_IO_REMAPPING_RC_NODE;
+
+///
+/// Node type 2: named component node
+///
+typedef struct {
+  EFI_ACPI_6_0_IO_REMAPPING_NODE          Node;
+
+  UINT32                                  Flags;
+  UINT32                                  CacheCoherent;
+  UINT8                                   AllocationHints;
+  UINT16                                  Reserved;
+  UINT8                                   MemoryAccessFlags;
+  UINT8                                   AddressSizeLimit;
+//UINT8                                   ObjectName[];
+} EFI_ACPI_6_0_IO_REMAPPING_NAMED_COMP_NODE;
+
+///
+/// Node type 3: SMMUv1 or SMMUv2 node
+///
+typedef struct {
+  UINT32                                  Interrupt;
+  UINT32                                  InterruptFlags;
+} EFI_ACPI_6_0_IO_REMAPPING_SMMU_INT;
+
+typedef struct {
+  EFI_ACPI_6_0_IO_REMAPPING_NODE          Node;
+
+  UINT64                                  Base;
+  UINT64                                  Span;
+  UINT32                                  Model;
+  UINT32                                  Flags;
+  UINT32                                  GlobalInterruptArrayRef;
+  UINT32                                  NumContextInterrupts;
+  UINT32                                  ContextInterruptArrayRef;
+  UINT32                                  NumPmuInterrupts;
+  UINT32                                  PmuInterruptArrayRef;
+
+  UINT32                                  SMMU_NSgIrpt;
+  UINT32                                  SMMU_NSgIrptFlags;
+  UINT32                                  SMMU_NSgCfgIrpt;
+  UINT32                                  SMMU_NSgCfgIrptFlags;
+
+//EFI_ACPI_6_0_IO_REMAPPING_SMMU_CTX_INT  ContextInterrupt[NumContextInterrupts];
+//EFI_ACPI_6_0_IO_REMAPPING_SMMU_CTX_INT  PmuInterrupt[NumPmuInterrupts];
+} EFI_ACPI_6_0_IO_REMAPPING_SMMU_NODE;
+
+///
+/// Node type 4: SMMUv4 node
+///
+typedef struct {
+  EFI_ACPI_6_0_IO_REMAPPING_NODE          Node;
+
+  UINT64                                  Base;
+  UINT32                                  Flags;
+  UINT32                                  Reserved;
+  UINT64                                  VatosAddress;
+  UINT32                                  Model;
+  UINT32                                  Event;
+  UINT32                                  Pri;
+  UINT32                                  Gerr;
+  UINT32                                  Sync;
+} EFI_ACPI_6_0_IO_REMAPPING_SMMU3_NODE;
+
+#pragma pack()
+
+#endif
