[RFC PATCH 1/1] MdePkg/IndustryStandard: add definitions for ACPI 6.4 CEDT

[Yuquan Wang]

This adds #defines and struct typedefs for the various structure
types in the ACPI 6.4 CXL Early Discovery Table (CEDT).

Signed-off-by: Yuquan Wang <wangyuquan1236@phytium.com.cn>
---
 MdePkg/Include/IndustryStandard/Acpi64.h      |  5 ++
 .../IndustryStandard/CXLEarlyDiscoveryTable.h | 69 +++++++++++++++++++
 2 files changed, 74 insertions(+)
 create mode 100644 MdePkg/Include/IndustryStandard/CXLEarlyDiscoveryTable.h

diff --git a/MdePkg/Include/IndustryStandard/Acpi64.h 
b/MdePkg/Include/IndustryStandard/Acpi64.h
index bbe6a3c9eb..c988de8ebf 100644
--- a/MdePkg/Include/IndustryStandard/Acpi64.h
+++ b/MdePkg/Include/IndustryStandard/Acpi64.h
@@ -3169,6 +3169,11 @@ typedef struct {
 ///
 #define EFI_ACPI_6_4_XEN_PROJECT_TABLE_SIGNATURE  SIGNATURE_32('X', 'E', 'N', 
'V')
 
+///
+/// "CEDT" CXL Early Discovery Table
+///
+#define EFI_ACPI_6_4_CXL_EARLY_DISCOVERY_TABLE_SIGNATURE  SIGNATURE_32 ('C', 
'E', 'D', 'T')
+
 #pragma pack()
 
 #endif
diff --git a/MdePkg/Include/IndustryStandard/CXLEarlyDiscoveryTable.h 
b/MdePkg/Include/IndustryStandard/CXLEarlyDiscoveryTable.h
new file mode 100644
index 0000000000..84f88dc737
--- /dev/null
+++ b/MdePkg/Include/IndustryStandard/CXLEarlyDiscoveryTable.h
@@ -0,0 +1,69 @@
+/** @file
+  ACPI CXL Early Discovery Table (CEDT) definitions.
+
+  Copyright (c) 2024, Phytium Technology Co Ltd. All rights reserved.
+
+**/
+
+#ifndef __CXL_Early_Discovery_TABLE_H__
+#define __CXL_Early_Discovery_TABLE_H__
+
+#include <IndustryStandard/Acpi.h>
+#include <IndustryStandard/Acpi64.h>
+
+#define EFI_ACPI_CXL_Early_Discovery_TABLE_REVISION_01  0x1   //CXL2.0
+#define EFI_ACPI_CXL_Early_Discovery_TABLE_REVISION_02  0x2   //CXL3.1
+
+#define EFI_ACPI_CEDT_TYPE_CHBS     0x0
+#define EFI_ACPI_CEDT_TYPE_CFMWS    0x1
+
+#pragma pack(1)
+
+///
+/// Table header
+///
+typedef struct {
+  EFI_ACPI_DESCRIPTION_HEADER    Header;
+} EFI_ACPI_6_4_CXL_Early_Discovery_TABLE;
+
+///
+/// Node header definition shared by all structure types
+///
+typedef struct {
+  UINT8     Type;
+  UINT8     Reserved;
+  UINT16    Length;
+} EFI_ACPI_6_4_CEDT_Structure;
+
+///
+/// Definition for CXL Host Bridge Structure
+///
+typedef struct {
+  EFI_ACPI_6_4_CEDT_Structure    header;
+  UINT32                         UID;
+  UINT32                         CXLVersion;
+  UINT32                         Reserved;
+  UINT64                         Base;
+  UINT64                         Length;
+} EFI_ACPI_6_4_CXL_Host_Bridge_Structure;
+
+///
+/// Definition for CXL Fixed Memory Window Structure
+///
+typedef struct {
+  EFI_ACPI_6_4_CEDT_Structure    header;
+  UINT32                         Reserved;
+  UINT64                         BaseHPA;
+  UINT64                         WindowSize;
+  UINT8                          InterleaveMembers;
+  UINT8                          InterleaveArithmetic;
+  UINT16                         Reserved1;
+  UINT32                         Granularity;
+  UINT16                         Restrictions;
+  UINT16                         QtgId;
+  UINT32                         FirstTarget;
+} EFI_ACPI_6_4_CXL_Fixed_Memory_Window_Structure;
+
+#pragma pack()
+
+#endif
-- 
2.34.1