[edk2-devel] [PATCH v1 3/3] DynamicTablesPkg: Adds ACPI WSMT Table generator

["Abdul Lateef Attar via groups.io" <AbdulLateef.Attar=amd.com@groups.io>]

From: Abdul Lateef Attar <AbdulLateef.Attar@amd.com>

Adds generic ACPI WSMT table generator library.
Register/Deregister WSMT table.
Update the WSMT table during boot as per specification.

Cc: Sami Mujawar <Sami.Mujawar@arm.com>
Cc: Pierre Gondois <pierre.gondois@arm.com>
Signed-off-by: Abdul Lateef Attar <AbdulLateef.Attar@amd.com>
---
 DynamicTablesPkg/DynamicTables.dsc.inc        |   2 +
 DynamicTablesPkg/Include/AcpiTableGenerator.h |   1 +
 .../Include/ArchNameSpaceObjects.h            |  10 +
 .../Library/Acpi/AcpiWsmtLib/AcpiWsmtLib.inf  |  34 +++
 .../Library/Acpi/AcpiWsmtLib/WsmtGenerator.c  | 221 ++++++++++++++++++
 5 files changed, 268 insertions(+)
 create mode 100644 DynamicTablesPkg/Library/Acpi/AcpiWsmtLib/AcpiWsmtLib.inf
 create mode 100644 DynamicTablesPkg/Library/Acpi/AcpiWsmtLib/WsmtGenerator.c

diff --git a/DynamicTablesPkg/DynamicTables.dsc.inc b/DynamicTablesPkg/DynamicTables.dsc.inc
index af70785520..5e66f5cd02 100644
--- a/DynamicTablesPkg/DynamicTables.dsc.inc
+++ b/DynamicTablesPkg/DynamicTables.dsc.inc
@@ -36,6 +36,7 @@
   #
   DynamicTablesPkg/Library/Acpi/AcpiFadtLib/AcpiFadtLib.inf
   DynamicTablesPkg/Library/Acpi/AcpiHpetLib/AcpiHpetLib.inf
+  DynamicTablesPkg/Library/Acpi/AcpiWsmtLib/AcpiWsmtLib.inf
 
   #
   # Dynamic Table Factory Dxe
@@ -44,6 +45,7 @@
     <LibraryClasses>
       NULL|DynamicTablesPkg/Library/Acpi/AcpiFadtLib/AcpiFadtLib.inf
       NULL|DynamicTablesPkg/Library/Acpi/AcpiHpetLib/AcpiHpetLib.inf
+      NULL|DynamicTablesPkg/Library/Acpi/AcpiWsmtLib/AcpiWsmtLib.inf
   }
 
 [Components.ARM, Components.AARCH64]
diff --git a/DynamicTablesPkg/Include/AcpiTableGenerator.h b/DynamicTablesPkg/Include/AcpiTableGenerator.h
index 18b5f99f47..a32ef46ecb 100644
--- a/DynamicTablesPkg/Include/AcpiTableGenerator.h
+++ b/DynamicTablesPkg/Include/AcpiTableGenerator.h
@@ -100,6 +100,7 @@ typedef enum StdAcpiTableId {
   EStdAcpiTableIdSsdtPciExpress,                ///< SSDT Pci Express Generator
   EStdAcpiTableIdPcct,                          ///< PCCT Generator
   EStdAcpiTableIdHpet,                          ///< HPET Generator
+  EStdAcpiTableIdWsmt,                          ///< WSMT Generator
   EStdAcpiTableIdMax
 } ESTD_ACPI_TABLE_ID;
 
diff --git a/DynamicTablesPkg/Include/ArchNameSpaceObjects.h b/DynamicTablesPkg/Include/ArchNameSpaceObjects.h
index b421c4cd29..ad3045dfec 100644
--- a/DynamicTablesPkg/Include/ArchNameSpaceObjects.h
+++ b/DynamicTablesPkg/Include/ArchNameSpaceObjects.h
@@ -39,6 +39,7 @@ typedef enum ArchObjectID {
   EArchObjFadtArmBootArch,        ///< 11 - ARM boot arch information
   EArchObjFadtHypervisorVendorId, ///< 12 - Hypervisor vendor identity information
   EArchObjFadtMiscInfo,           ///< 13 - Legacy fields; RTC, latency, flush stride, etc
+  EArchObjWsmtProtectionFlags,    ///< 14 - WSMT protection flags
   EArchObjMax
 } E_ARCH_OBJECT_ID;
 
@@ -214,4 +215,13 @@ typedef struct CmArchFadtMiscInfo {
   UINT8     Century;
 } CM_ARCH_FADT_MISC_INFO;
 
+/** A structure that describes the
+    protection flags for the WSMT fields information.
+
+    ID: EArchObjWsmtProtectionFlags
+*/
+typedef struct CmArchWsmtProtectionFlags {
+  UINT32    ProtectionFlags;
+} CM_ARCH_WSMT_PROTECTION_FLAGS;
+
 #endif
diff --git a/DynamicTablesPkg/Library/Acpi/AcpiWsmtLib/AcpiWsmtLib.inf b/DynamicTablesPkg/Library/Acpi/AcpiWsmtLib/AcpiWsmtLib.inf
new file mode 100644
index 0000000000..f8683a5005
--- /dev/null
+++ b/DynamicTablesPkg/Library/Acpi/AcpiWsmtLib/AcpiWsmtLib.inf
@@ -0,0 +1,34 @@
+## @file
+#  WSMT Table Generator
+#
+#  Copyright (C) 2024 Advanced Micro Devices, Inc. All rights reserved.
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+##
+
+[Defines]
+  INF_VERSION    = 1.27
+  BASE_NAME      = AcpiWsmtLib
+  FILE_GUID      = D6C34086-C914-4F8E-B56A-08329B4D1271
+  VERSION_STRING = 1.0
+  MODULE_TYPE    = DXE_DRIVER
+  LIBRARY_CLASS  = NULL|DXE_DRIVER
+  CONSTRUCTOR    = AcpiWsmtLibConstructor
+  DESTRUCTOR     = AcpiWsmtLibDestructor
+
+[Sources]
+  WsmtGenerator.c
+
+[Packages]
+  DynamicTablesPkg/DynamicTablesPkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  BaseLib
+  DebugLib
+  PcdLib
+
+[Pcd]
+  gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiDefaultCreatorId
+  gEfiMdeModulePkgTokenSpaceGuid.PcdAcpiDefaultCreatorRevision
diff --git a/DynamicTablesPkg/Library/Acpi/AcpiWsmtLib/WsmtGenerator.c b/DynamicTablesPkg/Library/Acpi/AcpiWsmtLib/WsmtGenerator.c
new file mode 100644
index 0000000000..c102152974
--- /dev/null
+++ b/DynamicTablesPkg/Library/Acpi/AcpiWsmtLib/WsmtGenerator.c
@@ -0,0 +1,221 @@
+/** @file
+  WSMT Table Generator
+
+  Copyright (c) 2017 - 2023, Arm Limited. All rights reserved.
+  Copyright (C) 2024 Advanced Micro Devices, Inc. All rights reserved.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+  @par Reference(s):
+  - ACPI 6.5 Specification, Aug 29, 2022
+  - WSMT spec, version 1.0, April 18, 2016
+
+**/
+
+#include <AcpiTableGenerator.h>
+#include <ConfigurationManagerHelper.h>
+#include <ConfigurationManagerObject.h>
+#include <IndustryStandard/WindowsSmmSecurityMitigationTable.h>
+#include <Library/DebugLib.h>
+#include <Library/TableHelperLib.h>
+#include <Protocol/ConfigurationManagerProtocol.h>
+#include <Uefi/UefiBaseType.h>
+#include <Uefi/UefiSpec.h>
+#include <ArchNameSpaceObjects.h>
+
+/** This macro expands to a function that retrieves the
+    protection flags information for WSMT Table.
+*/
+GET_OBJECT_LIST (
+  EObjNameSpaceArch,
+  EArchObjWsmtProtectionFlags,
+  CM_ARCH_WSMT_PROTECTION_FLAGS
+  );
+
+/** The AcpiWsmt is a template EFI_ACPI_WSMT_TABLE
+    structure used for generating the WSMT Table.
+*/
+STATIC
+EFI_ACPI_WSMT_TABLE  mAcpiWsmt = {
+  ACPI_HEADER (
+    EFI_ACPI_WINDOWS_SMM_SECURITY_MITIGATION_TABLE_SIGNATURE,
+    EFI_ACPI_WSMT_TABLE,
+    EFI_WSMT_TABLE_REVISION
+    ),
+  EFI_WSMT_PROTECTION_FLAGS_SYSTEM_RESOURCE_PROTECTION|EFI_WSMT_PROTECTION_FLAGS_COMM_BUFFER_NESTED_PTR_PROTECTION|EFI_WSMT_PROTECTION_FLAGS_FIXED_COMM_BUFFERS
+};
+
+/** Construct the WSMT table.
+
+  This function invokes the Configuration Manager protocol interface
+  to get the required hardware information for generating the ACPI
+  table.
+
+  If this function allocates any resources then they must be freed
+  in the FreeXXXXTableResources function.
+
+  @param [in]  This           Pointer to the table generator.
+  @param [in]  AcpiTableInfo  Pointer to the ACPI Table Info.
+  @param [in]  CfgMgrProtocol Pointer to the Configuration Manager
+                              Protocol Interface.
+  @param [out] Table          Pointer to the constructed ACPI Table.
+
+  @retval EFI_SUCCESS           Table generated successfully.
+  @retval EFI_INVALID_PARAMETER A parameter is invalid.
+  @retval EFI_NOT_FOUND         The required object was not found.
+  @retval EFI_BAD_BUFFER_SIZE   The size returned by the Configuration
+                                Manager is less than the Object size for the
+                                requested object.
+**/
+STATIC
+EFI_STATUS
+BuildWsmtTable (
+  IN  CONST ACPI_TABLE_GENERATOR                  *CONST  This,
+  IN  CONST CM_STD_OBJ_ACPI_TABLE_INFO            *CONST  AcpiTableInfo,
+  IN  CONST EDKII_CONFIGURATION_MANAGER_PROTOCOL  *CONST  CfgMgrProtocol,
+  OUT       EFI_ACPI_DESCRIPTION_HEADER          **CONST  Table
+  )
+{
+  EFI_STATUS                     Status;
+  CM_ARCH_WSMT_PROTECTION_FLAGS  *ProtectionFlags;
+
+  ASSERT (This != NULL);
+  ASSERT (AcpiTableInfo != NULL);
+  ASSERT (CfgMgrProtocol != NULL);
+  ASSERT (Table != NULL);
+  ASSERT (AcpiTableInfo->TableGeneratorId == This->GeneratorID);
+  ASSERT (AcpiTableInfo->AcpiTableSignature == This->AcpiTableSignature);
+
+  if ((AcpiTableInfo->AcpiTableRevision < This->MinAcpiTableRevision) ||
+      (AcpiTableInfo->AcpiTableRevision > This->AcpiTableRevision))
+  {
+    DEBUG ((
+      DEBUG_ERROR,
+      "ERROR: WSMT: Requested table revision = %d, is not supported."
+      "Supported table revision: Minimum = %d, Maximum = %d\n",
+      AcpiTableInfo->AcpiTableRevision,
+      This->MinAcpiTableRevision,
+      This->AcpiTableRevision
+      ));
+    return EFI_INVALID_PARAMETER;
+  }
+
+  *Table = NULL;
+
+  Status = AddAcpiHeader (
+             CfgMgrProtocol,
+             This,
+             (EFI_ACPI_DESCRIPTION_HEADER *)&mAcpiWsmt,
+             AcpiTableInfo,
+             sizeof (EFI_ACPI_WSMT_TABLE)
+             );
+  if (EFI_ERROR (Status)) {
+    DEBUG ((
+      DEBUG_ERROR,
+      "ERROR: WSMT: Failed to add ACPI header. Status = %r\n",
+      Status
+      ));
+    return Status;
+  }
+
+  Status = GetEArchObjWsmtProtectionFlags (
+             CfgMgrProtocol,
+             CM_NULL_TOKEN,
+             &ProtectionFlags,
+             NULL
+             );
+  if (EFI_ERROR (Status)) {
+    DEBUG ((
+      DEBUG_ERROR,
+      "ERROR: WSMT: Failed to get protection flags information." \
+      " Status = %r\n",
+      Status
+      ));
+  } else {
+    mAcpiWsmt.ProtectionFlags = ProtectionFlags->ProtectionFlags;
+  }
+
+  *Table = (EFI_ACPI_DESCRIPTION_HEADER *)&mAcpiWsmt;
+
+  return Status;
+}
+
+/** The interface for the WSMT Table Generator.
+*/
+STATIC
+CONST
+ACPI_TABLE_GENERATOR  mWsmtGenerator = {
+  // Generator ID
+  CREATE_STD_ACPI_TABLE_GEN_ID (EStdAcpiTableIdWsmt),
+  // Generator Description
+  L"ACPI.STD.WSMT.GENERATOR",
+  // ACPI Table Signature
+  EFI_ACPI_WINDOWS_SMM_SECURITY_MITIGATION_TABLE_SIGNATURE,
+  // ACPI Table Revision supported by this Generator
+  EFI_WSMT_TABLE_REVISION,
+  // Minimum supported ACPI Table Revision
+  EFI_WSMT_TABLE_REVISION,
+  // Creator ID
+  FixedPcdGet32 (PcdAcpiDefaultCreatorId),
+  // Creator Revision
+  FixedPcdGet32 (PcdAcpiDefaultCreatorRevision),
+  // Build Table function
+  BuildWsmtTable,
+  // No additional resources are allocated by the generator.
+  // Hence the Free Resource function is not required.
+  NULL,
+  // Extended build function not needed
+  NULL,
+  // Extended build function not implemented by the generator.
+  // Hence extended free resource function is not required.
+  NULL
+};
+
+/** Register the Generator with the ACPI Table Factory.
+
+  @param [in]  ImageHandle  The handle to the image.
+  @param [in]  SystemTable  Pointer to the System Table.
+
+  @retval EFI_SUCCESS           The Generator is registered.
+  @retval EFI_INVALID_PARAMETER A parameter is invalid.
+  @retval EFI_ALREADY_STARTED   The Generator for the Table ID
+                                is already registered.
+**/
+EFI_STATUS
+EFIAPI
+AcpiWsmtLibConstructor (
+  IN  EFI_HANDLE        ImageHandle,
+  IN  EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  EFI_STATUS  Status;
+
+  Status = RegisterAcpiTableGenerator (&mWsmtGenerator);
+  DEBUG ((DEBUG_INFO, "WSMT: Register Generator. Status = %r\n", Status));
+  ASSERT_EFI_ERROR (Status);
+  return Status;
+}
+
+/** Deregister the Generator from the ACPI Table Factory.
+
+  @param [in]  ImageHandle  The handle to the image.
+  @param [in]  SystemTable  Pointer to the System Table.
+
+  @retval EFI_SUCCESS           The Generator is deregistered.
+  @retval EFI_INVALID_PARAMETER A parameter is invalid.
+  @retval EFI_NOT_FOUND         The Generator is not registered.
+**/
+EFI_STATUS
+EFIAPI
+AcpiWsmtLibDestructor (
+  IN  EFI_HANDLE        ImageHandle,
+  IN  EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  EFI_STATUS  Status;
+
+  Status = DeregisterAcpiTableGenerator (&mWsmtGenerator);
+  DEBUG ((DEBUG_INFO, "WSMT: Deregister Generator. Status = %r\n", Status));
+  ASSERT_EFI_ERROR (Status);
+  return Status;
+}
-- 
2.34.1



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