[RFC PATCH edk2-platforms 2/2] SbsaQemu: AcpiTables: Add CEDT Table

[Yuquan Wang]

Provide CXL Early Discovery Table that describes the static CXL
Platform Components of sbsa-ref.

This adds a static CXL Host Bridge structure and a CXL Fixed Memory
Window structure which are implemented as two independent space on
sbsa-ref: [SBSA_CXL_HOST] & [SBSA_CXL_FIXED_WINDOW].

Signed-off-by: Yuquan Wang <wangyuquan1236@phytium.com.cn>
---
 .../Qemu/SbsaQemu/AcpiTables/AcpiTables.inf   |  6 +-
 Silicon/Qemu/SbsaQemu/AcpiTables/Cedt.aslc    | 70 +++++++++++++++++++
 Silicon/Qemu/SbsaQemu/SbsaQemu.dec            |  7 ++
 3 files changed, 82 insertions(+), 1 deletion(-)
 create mode 100644 Silicon/Qemu/SbsaQemu/AcpiTables/Cedt.aslc

diff --git a/Silicon/Qemu/SbsaQemu/AcpiTables/AcpiTables.inf 
b/Silicon/Qemu/SbsaQemu/AcpiTables/AcpiTables.inf
index b4d5aa807bd9..f39b06d708d5 100644
--- a/Silicon/Qemu/SbsaQemu/AcpiTables/AcpiTables.inf
+++ b/Silicon/Qemu/SbsaQemu/AcpiTables/AcpiTables.inf
@@ -21,7 +21,7 @@
   Fadt.aslc
   Mcfg.aslc
   Spcr.aslc
-
+  Cedt.aslc
 [Packages]
   ArmPlatformPkg/ArmPlatformPkg.dec
   ArmPkg/ArmPkg.dec
@@ -78,6 +78,10 @@
   gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdCxlBarSize
   gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdCxlBarLimit
 
+  gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdChbcrBase
+  gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdCfmwsBase
+  gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdCfmwsSize
+
   gEfiMdeModulePkgTokenSpaceGuid.PcdSerialRegisterBase
 
   gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdPlatformAhciBase
diff --git a/Silicon/Qemu/SbsaQemu/AcpiTables/Cedt.aslc 
b/Silicon/Qemu/SbsaQemu/AcpiTables/Cedt.aslc
new file mode 100644
index 000000000000..66c9dc8858bc
--- /dev/null
+++ b/Silicon/Qemu/SbsaQemu/AcpiTables/Cedt.aslc
@@ -0,0 +1,70 @@
+/** @file
+*  CXL Early Discovery Table (CEDT)
+*
+*  Copyright (c) 2024, Phytium Technology Co Ltd. All rights reserved.
+*
+**/
+
+#include <IndustryStandard/CXLEarlyDiscoveryTable.h>
+#include <IndustryStandard/Acpi64.h>
+#include <IndustryStandard/SbsaQemuAcpi.h>
+
+#pragma pack(1)
+
+typedef struct
+{
+  EFI_ACPI_6_4_CXL_Early_Discovery_TABLE           Header;
+  EFI_ACPI_6_4_CXL_Host_Bridge_Structure           Chbs;
+  EFI_ACPI_6_4_CXL_Fixed_Memory_Window_Structure   Cfmws;
+} SBSA_REF_CEDT;
+
+
+SBSA_REF_CEDT Cedt =
+{
+  // EFI_ACPI_6_4_CXL_Early_Discovery_TABLE(Header)
+  {
+     SBSAQEMU_ACPI_HEADER  // EFI_ACPI_DESCRIPTION_HEADER
+     (
+       EFI_ACPI_6_4_CXL_EARLY_DISCOVERY_TABLE_SIGNATURE,
+       SBSA_REF_CEDT,
+       EFI_ACPI_CXL_Early_Discovery_TABLE_REVISION_01
+     ),
+  },
+  // EFI_ACPI_6_4_CXL_Host_Bridge_Structure
+  {
+    // EFI_ACPI_6_4_CEDT_Structure
+    {
+        EFI_ACPI_CEDT_TYPE_CHBS,                                 // Type
+        0,                                                       // Reserved
+        sizeof (EFI_ACPI_6_4_CXL_Host_Bridge_Structure),         // Length
+    },
+    FixedPcdGet32 (PcdCxlBusMin),          // UID
+    0x1,                                   // CXLVersion
+    0,                                     // Reserved
+    FixedPcdGet32 (PcdChbcrBase),          // CHBCR Base
+    0X10000,                               // Length
+  },
+  // EFI_ACPI_6_4_CXL_Fixed_Memory_Window_Structure
+  {
+    // EFI_ACPI_6_4_CEDT_Structure
+    {
+        EFI_ACPI_CEDT_TYPE_CFMWS,                                // Type
+        0,                                                       // Reserved
+        sizeof (EFI_ACPI_6_4_CXL_Fixed_Memory_Window_Structure), // Length
+    },
+    0,                                     // Reserved
+    FixedPcdGet32 (PcdCfmwsBase),          // BaseHPA
+    FixedPcdGet32 (PcdCfmwsSize),          // WindowSize
+    0,                                     // InterleaveMembers
+    0,                                     // InterleaveArithmetic
+    0,                                     // Reserved1
+    0,                                     // Granularity
+    0xF,                                   // Restrictions
+    0,                                     // QtgId
+    FixedPcdGet32 (PcdCxlBusMin),          // FirstTarget
+  }
+};
+
+#pragma pack ()
+
+VOID* CONST ReferenceAcpiTable = &Cedt;
diff --git a/Silicon/Qemu/SbsaQemu/SbsaQemu.dec 
b/Silicon/Qemu/SbsaQemu/SbsaQemu.dec
index 7d8c7997160b..dff838315d06 100644
--- a/Silicon/Qemu/SbsaQemu/SbsaQemu.dec
+++ b/Silicon/Qemu/SbsaQemu/SbsaQemu.dec
@@ -65,6 +65,13 @@ HardwareInfoLib|Include/Library/HardwareInfoLib.h
   gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdCxlBusMin|254|UINT32|0x00000019
   gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdCxlBusMax|255|UINT32|0x00000020
 
+  # PCDs complementing base address for CXL CHBCR (CXL Host Bridge Component 
Registers)
+  
gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdChbcrBase|0x60120000|UINT64|0x00000021
+
+  # CXL Fixed Memory Window
+  
gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdCfmwsBase|0xA0000000000|UINT64|0x00000022
+  
gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdCfmwsSize|0x10000000000|UINT64|0x00000023
+
 [PcdsDynamic.common]
   
gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdSystemManufacturer|L""|VOID*|0x00000110
   
gArmVirtSbsaQemuPlatformTokenSpaceGuid.PcdSystemSerialNumber|L""|VOID*|0x00000111
-- 
2.34.1