[edk2] [PATCH v1 18/22] DynamicTablesPkg: Arm ACPI GTDT Generator

Sami Mujawar sami.mujawar at arm.com
Fri Dec 21 08:57:15 PST 2018


The GTDT generator uses the configuration manager protocol to
obtain information about the architectural and platform timers
available on the platform and generates the ACPI GTDT table.
This table data is then used by the Table Manager to install
the GTDT table.

The Table Manager then invokes the generator interface to free
any resources allocated by the GTDT table generator.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Sami Mujawar <sami.mujawar at arm.com>
---
 DynamicTablesPkg/DynamicTables.dsc.inc                              |   1 +
 DynamicTablesPkg/Library/Acpi/Arm/AcpiGtdtLibArm/AcpiGtdtLibArm.inf |  42 ++
 DynamicTablesPkg/Library/Acpi/Arm/AcpiGtdtLibArm/GtdtGenerator.c    | 674 ++++++++++++++++++++
 3 files changed, 717 insertions(+)

diff --git a/DynamicTablesPkg/DynamicTables.dsc.inc b/DynamicTablesPkg/DynamicTables.dsc.inc
index 43e0f564af51cd6327b210af363488ed2a788cc4..056a1293c93268a6203fc3711079880d11cbc1bc 100644
--- a/DynamicTablesPkg/DynamicTables.dsc.inc
+++ b/DynamicTablesPkg/DynamicTables.dsc.inc
@@ -28,6 +28,7 @@ [Components.common]
   DynamicTablesPkg/Drivers/DynamicTableFactoryDxe/DynamicTableFactoryDxe.inf {
     <LibraryClasses>
       NULL|DynamicTablesPkg/Library/Acpi/Arm/AcpiFadtLibArm/AcpiFadtLibArm.inf
+      NULL|DynamicTablesPkg/Library/Acpi/Arm/AcpiGtdtLibArm/AcpiGtdtLibArm.inf
       NULL|DynamicTablesPkg/Library/Acpi/Arm/AcpiMadtLibArm/AcpiMadtLibArm.inf
       NULL|DynamicTablesPkg/Library/Acpi/Arm/AcpiRawLibArm/AcpiRawLibArm.inf
   }
diff --git a/DynamicTablesPkg/Library/Acpi/Arm/AcpiGtdtLibArm/AcpiGtdtLibArm.inf b/DynamicTablesPkg/Library/Acpi/Arm/AcpiGtdtLibArm/AcpiGtdtLibArm.inf
new file mode 100644
index 0000000000000000000000000000000000000000..da3db2b1ff882a9e3a71810eff3d76681ec9d208
--- /dev/null
+++ b/DynamicTablesPkg/Library/Acpi/Arm/AcpiGtdtLibArm/AcpiGtdtLibArm.inf
@@ -0,0 +1,42 @@
+## @file
+#  GTDT Table Generator
+#
+#  Copyright (c) 2017 - 2018, ARM Limited. All rights reserved.
+#
+#  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.
+##
+
+[Defines]
+  INF_VERSION    = 0x00010019
+  BASE_NAME      = AcpiGtdtLibArm
+  FILE_GUID      = 26490F7A-7FA2-423C-8939-C6206329BC37
+  VERSION_STRING = 1.0
+  MODULE_TYPE    = DXE_DRIVER
+  LIBRARY_CLASS  = NULL|DXE_DRIVER
+  CONSTRUCTOR    = AcpiGtdtLibConstructor
+  DESTRUCTOR     = AcpiGtdtLibDestructor
+
+[Sources]
+  GtdtGenerator.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  EmbeddedPkg/EmbeddedPkg.dec
+  DynamicTablesPkg/DynamicTablesPkg.dec
+
+[LibraryClasses]
+  BaseLib
+
+[FixedPcd]
+
+[Protocols]
+
+[Guids]
+
diff --git a/DynamicTablesPkg/Library/Acpi/Arm/AcpiGtdtLibArm/GtdtGenerator.c b/DynamicTablesPkg/Library/Acpi/Arm/AcpiGtdtLibArm/GtdtGenerator.c
new file mode 100644
index 0000000000000000000000000000000000000000..8414225291a68a888f13799e92e0c39b7f3bffc2
--- /dev/null
+++ b/DynamicTablesPkg/Library/Acpi/Arm/AcpiGtdtLibArm/GtdtGenerator.c
@@ -0,0 +1,674 @@
+/** @file
+  GTDT Table Generator
+
+  Copyright (c) 2017 - 2018, ARM Limited. All rights reserved.
+  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.
+
+  @par Reference(s):
+  - ACPI 6.2 Specification - Errata A, September 2017
+
+**/
+
+#include <Library/AcpiLib.h>
+#include <Library/DebugLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Protocol/AcpiTable.h>
+
+// Module specific include files.
+#include <AcpiTableGenerator.h>
+#include <ConfigurationManagerObject.h>
+#include <ConfigurationManagerHelper.h>
+#include <Library/TableHelperLib.h>
+#include <Protocol/ConfigurationManagerProtocol.h>
+
+/** ARM standard GTDT Generator
+
+Requirements:
+  The following Configuration Manager Object(s) are required by
+  this Generator:
+  - EArmObjGenericTimerInfo
+  - EArmObjPlatformGenericWatchdogInfo (OPTIONAL)
+  - EArmObjPlatformGTBlockInfo (OPTIONAL)
+  - EArmObjGTBlockTimerFrameInfo (OPTIONAL)
+*/
+
+/** This macro expands to a function that retrieves the Generic
+    Timer Information from the Configuration Manager.
+*/
+GET_OBJECT_LIST (
+  EObjNameSpaceArm,
+  EArmObjGenericTimerInfo,
+  CM_ARM_GENERIC_TIMER_INFO
+  );
+
+/** This macro expands to a function that retrieves the SBSA Generic
+    Watchdog Timer Information from the Configuration Manager.
+*/
+GET_OBJECT_LIST (
+  EObjNameSpaceArm,
+  EArmObjPlatformGenericWatchdogInfo,
+  CM_ARM_GENERIC_WATCHDOG_INFO
+  );
+
+/** This macro expands to a function that retrieves the Platform Generic
+    Timer Block Information from the Configuration Manager.
+*/
+GET_OBJECT_LIST (
+  EObjNameSpaceArm,
+  EArmObjPlatformGTBlockInfo,
+  CM_ARM_GTBLOCK_INFO
+  );
+
+/** This macro expands to a function that retrieves the Generic
+  Timer Block Timer Frame Information from the Configuration Manager.
+*/
+GET_OBJECT_LIST (
+  EObjNameSpaceArm,
+  EArmObjGTBlockTimerFrameInfo,
+  CM_ARM_GTBLOCK_TIMER_FRAME_INFO
+  );
+
+/** Add the Generic Timer Information to the GTDT table.
+
+  Also update the Platform Timer offset information if the platform
+  implements platform timers.
+
+  @param [in]  CfgMgrProtocol     Pointer to the Configuration Manager
+                                  Protocol Interface.
+  @param [in]  Gtdt               Pointer to the GTDT Table.
+  @param [in]  PlatformTimerCount Platform timer count.
+
+  @retval EFI_SUCCESS           Success.
+  @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
+EFIAPI
+AddGenericTimerInfo (
+  IN  CONST EDKII_CONFIGURATION_MANAGER_PROTOCOL         * CONST CfgMgrProtocol,
+  IN        EFI_ACPI_6_2_GENERIC_TIMER_DESCRIPTION_TABLE * CONST Gtdt,
+  IN  CONST UINT32                                               PlatformTimerCount
+)
+{
+  EFI_STATUS                   Status;
+  CM_ARM_GENERIC_TIMER_INFO  * GenericTimerInfo;
+
+  ASSERT (CfgMgrProtocol != NULL);
+  ASSERT (Gtdt != NULL);
+
+  Status = GetEArmObjGenericTimerInfo (
+             CfgMgrProtocol,
+             CM_NULL_TOKEN,
+             &GenericTimerInfo,
+             NULL
+             );
+
+  if (EFI_ERROR (Status)) {
+    DEBUG ((
+      DEBUG_ERROR,
+      "ERROR: GTDT: Failed to get GenericTimerInfo. Status = %r\n",
+      Status
+      ));
+    return Status;
+  }
+
+  Gtdt->CntControlBasePhysicalAddress =
+    GenericTimerInfo->CounterControlBaseAddress;
+  Gtdt->Reserved = EFI_ACPI_RESERVED_DWORD;
+  Gtdt->SecurePL1TimerGSIV = GenericTimerInfo->SecurePL1TimerGSIV;
+  Gtdt->SecurePL1TimerFlags = GenericTimerInfo->SecurePL1TimerFlags;
+  Gtdt->NonSecurePL1TimerGSIV = GenericTimerInfo->NonSecurePL1TimerGSIV;
+  Gtdt->NonSecurePL1TimerFlags = GenericTimerInfo->NonSecurePL1TimerFlags;
+  Gtdt->VirtualTimerGSIV = GenericTimerInfo->VirtualTimerGSIV;
+  Gtdt->VirtualTimerFlags = GenericTimerInfo->VirtualTimerFlags;
+  Gtdt->NonSecurePL2TimerGSIV = GenericTimerInfo->NonSecurePL2TimerGSIV;
+  Gtdt->NonSecurePL2TimerFlags = GenericTimerInfo->NonSecurePL2TimerFlags;
+  Gtdt->CntReadBasePhysicalAddress =
+    GenericTimerInfo->CounterReadBaseAddress;
+  Gtdt->PlatformTimerCount = PlatformTimerCount;
+  Gtdt->PlatformTimerOffset = (PlatformTimerCount == 0) ? 0 :
+    sizeof (EFI_ACPI_6_2_GENERIC_TIMER_DESCRIPTION_TABLE);
+
+  return EFI_SUCCESS;
+}
+
+/** Add the SBSA Generic Watchdog Timers to the GTDT table.
+
+  @param [in]  Gtdt             Pointer to the GTDT Table.
+  @param [in]  WatchdogOffset   Offset to the watchdog information in the
+                                GTDT Table.
+  @param [in]  WatchdogInfoList Pointer to the watchdog information list.
+  @param [in]  WatchdogCount    Platform timer count.
+**/
+STATIC
+VOID
+AddGenericWatchdogList (
+  IN EFI_ACPI_6_2_GENERIC_TIMER_DESCRIPTION_TABLE  * CONST Gtdt,
+  IN CONST UINT32                                          WatchdogOffset,
+  IN CONST CM_ARM_GENERIC_WATCHDOG_INFO            *       WatchdogInfoList,
+  IN       UINT32                                          WatchdogCount
+  )
+{
+  EFI_ACPI_6_2_GTDT_SBSA_GENERIC_WATCHDOG_STRUCTURE  * Watchdog;
+
+  ASSERT (Gtdt != NULL);
+  ASSERT (WatchdogInfoList != NULL);
+
+  Watchdog = (EFI_ACPI_6_2_GTDT_SBSA_GENERIC_WATCHDOG_STRUCTURE *)
+             ((UINT8*)Gtdt + WatchdogOffset);
+
+  while (WatchdogCount-- != 0) {
+    // Add watchdog entry
+    DEBUG ((DEBUG_INFO, "GTDT: Watchdog = 0x%p\n", Watchdog));
+    Watchdog->Type = EFI_ACPI_6_2_GTDT_SBSA_GENERIC_WATCHDOG;
+    Watchdog->Length =
+      sizeof (EFI_ACPI_6_2_GTDT_SBSA_GENERIC_WATCHDOG_STRUCTURE);
+    Watchdog->Reserved = EFI_ACPI_RESERVED_BYTE;
+    Watchdog->RefreshFramePhysicalAddress =
+      WatchdogInfoList->RefreshFrameAddress;
+    Watchdog->WatchdogControlFramePhysicalAddress =
+      WatchdogInfoList->ControlFrameAddress;
+    Watchdog->WatchdogTimerGSIV = WatchdogInfoList->TimerGSIV;
+    Watchdog->WatchdogTimerFlags = WatchdogInfoList->Flags;
+    Watchdog++;
+    WatchdogInfoList++;
+  } // for
+}
+
+/** Update the GT Block Timer Frame lists in the GTDT Table.
+
+  @param [in]  GtBlockFrame           Pointer to the GT Block Frames
+                                      list to be updated.
+  @param [in]  GTBlockTimerFrameList  Pointer to the GT Block Frame
+                                      Information List.
+  @param [in]  GTBlockFrameCount      Number of GT Block Frames.
+
+  @retval EFI_SUCCESS           Table generated successfully.
+  @retval EFI_INVALID_PARAMETER A parameter is invalid.
+**/
+STATIC
+EFI_STATUS
+AddGTBlockTimerFrames (
+  IN       EFI_ACPI_6_2_GTDT_GT_BLOCK_TIMER_STRUCTURE *       GtBlockFrame,
+  IN CONST CM_ARM_GTBLOCK_TIMER_FRAME_INFO            *       GTBlockTimerFrameList,
+  IN       UINT32                                             GTBlockFrameCount
+)
+{
+  ASSERT (GtBlockFrame != NULL);
+  ASSERT (GTBlockTimerFrameList != NULL);
+
+  if (GTBlockFrameCount > 8) {
+    DEBUG ((
+      DEBUG_ERROR,
+      "ERROR: GTDT: GT Block Frame Count %d is greater than 8\n",
+      GTBlockFrameCount
+      ));
+    ASSERT (GTBlockFrameCount <= 8);
+    return EFI_INVALID_PARAMETER;
+  }
+
+  while (GTBlockFrameCount-- != 0) {
+    DEBUG ((
+      DEBUG_INFO,
+      "GTDT: GtBlockFrame = 0x%p\n",
+      GtBlockFrame
+      ));
+
+    GtBlockFrame->GTFrameNumber = GTBlockTimerFrameList->FrameNumber;
+    GtBlockFrame->Reserved[0] = EFI_ACPI_RESERVED_BYTE;
+    GtBlockFrame->Reserved[1] = EFI_ACPI_RESERVED_BYTE;
+    GtBlockFrame->Reserved[2] = EFI_ACPI_RESERVED_BYTE;
+
+    GtBlockFrame->CntBaseX = GTBlockTimerFrameList->PhysicalAddressCntBase;
+    GtBlockFrame->CntEL0BaseX =
+      GTBlockTimerFrameList->PhysicalAddressCntEL0Base;
+
+    GtBlockFrame->GTxPhysicalTimerGSIV =
+      GTBlockTimerFrameList->PhysicalTimerGSIV;
+    GtBlockFrame->GTxPhysicalTimerFlags =
+      GTBlockTimerFrameList->PhysicalTimerFlags;
+
+    GtBlockFrame->GTxVirtualTimerGSIV = GTBlockTimerFrameList->VirtualTimerGSIV;
+    GtBlockFrame->GTxVirtualTimerFlags =
+      GTBlockTimerFrameList->VirtualTimerFlags;
+
+    GtBlockFrame->GTxCommonFlags = GTBlockTimerFrameList->CommonFlags;
+    GtBlockFrame++;
+    GTBlockTimerFrameList++;
+  } // for
+  return EFI_SUCCESS;
+}
+
+/** Add the GT Block Timers in the GTDT Table.
+
+  @param [in]  CfgMgrProtocol   Pointer to the Configuration Manager
+                                Protocol Interface.
+  @param [in]  Gtdt             Pointer to the GTDT Table.
+  @param [in]  GTBlockOffset    Offset of the GT Block
+                                information in the GTDT Table.
+  @param [in]  GTBlockInfo      Pointer to the GT Block
+                                Information List.
+  @param [in]  BlockTimerCount  Number of GT Block Timers.
+
+  @retval EFI_SUCCESS           Table generated successfully.
+  @retval EFI_INVALID_PARAMETER A parameter is invalid.
+**/
+STATIC
+EFI_STATUS
+AddGTBlockList (
+  IN  CONST EDKII_CONFIGURATION_MANAGER_PROTOCOL     * CONST CfgMgrProtocol,
+  IN EFI_ACPI_6_2_GENERIC_TIMER_DESCRIPTION_TABLE    * CONST Gtdt,
+  IN CONST UINT32                                            GTBlockOffset,
+  IN CONST CM_ARM_GTBLOCK_INFO                       *       GTBlockInfo,
+  IN       UINT32                                            BlockTimerCount
+)
+{
+  EFI_STATUS                                    Status;
+  EFI_ACPI_6_2_GTDT_GT_BLOCK_STRUCTURE        * GTBlock;
+  EFI_ACPI_6_2_GTDT_GT_BLOCK_TIMER_STRUCTURE  * GtBlockFrame;
+  CM_ARM_GTBLOCK_TIMER_FRAME_INFO             * GTBlockTimerFrameList;
+  UINT32                                        GTBlockTimerFrameCount;
+
+  ASSERT (Gtdt != NULL);
+  ASSERT (GTBlockInfo != NULL);
+
+  GTBlock = (EFI_ACPI_6_2_GTDT_GT_BLOCK_STRUCTURE *)((UINT8*)Gtdt +
+              GTBlockOffset);
+
+  while (BlockTimerCount-- != 0) {
+    DEBUG ((DEBUG_INFO, "GTDT: GTBlock = 0x%p\n", GTBlock));
+
+    Status = GetEArmObjGTBlockTimerFrameInfo (
+               CfgMgrProtocol,
+               GTBlockInfo->GTBlockTimerFrameToken,
+               &GTBlockTimerFrameList,
+               &GTBlockTimerFrameCount
+               );
+    if (EFI_ERROR (Status) ||
+        (GTBlockTimerFrameCount != GTBlockInfo->GTBlockTimerFrameCount)) {
+      DEBUG ((
+        DEBUG_ERROR,
+        "ERROR: GTDT: Failed to get Generic Timer Frames. Status = %r\n",
+        Status
+        ));
+      return Status;
+    }
+
+    GTBlock->Type = EFI_ACPI_6_2_GTDT_GT_BLOCK;
+    GTBlock->Length = sizeof (EFI_ACPI_6_2_GTDT_GT_BLOCK_STRUCTURE) +
+                        (sizeof (EFI_ACPI_6_2_GTDT_GT_BLOCK_TIMER_STRUCTURE) *
+                          GTBlockInfo->GTBlockTimerFrameCount);
+
+    GTBlock->Reserved = EFI_ACPI_RESERVED_BYTE;
+    GTBlock->CntCtlBase = GTBlockInfo->GTBlockPhysicalAddress;
+    GTBlock->GTBlockTimerCount = GTBlockInfo->GTBlockTimerFrameCount;
+    GTBlock->GTBlockTimerOffset =
+      sizeof (EFI_ACPI_6_2_GTDT_GT_BLOCK_STRUCTURE);
+
+    GtBlockFrame = (EFI_ACPI_6_2_GTDT_GT_BLOCK_TIMER_STRUCTURE*)
+      ((UINT8*)GTBlock + GTBlock->GTBlockTimerOffset);
+
+    // Add GT Block Timer frames
+    Status = AddGTBlockTimerFrames (
+               GtBlockFrame,
+               GTBlockTimerFrameList,
+               GTBlockTimerFrameCount
+               );
+    if (EFI_ERROR (Status)) {
+      DEBUG ((
+        DEBUG_ERROR,
+        "ERROR: GTDT: Failed to add Generic Timer Frames. Status = %r\n",
+        Status
+        ));
+      return Status;
+    }
+
+    // Next GTBlock
+    GTBlock = (EFI_ACPI_6_2_GTDT_GT_BLOCK_STRUCTURE *)((UINT8*)GTBlock +
+               GTBlock->Length);
+    GTBlockInfo++;
+  }// for
+  return EFI_SUCCESS;
+}
+
+/** Construct the GTDT ACPI table.
+
+  Called by the Dynamic Table Manager, 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.
+  @retval EFI_OUT_OF_RESOURCES  Memory allocation failed.
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+BuildGtdtTable (
+  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;
+  UINT32                                          TableSize;
+  UINT32                                          PlatformTimerCount;
+  UINT32                                          WatchdogCount;
+  UINT32                                          BlockTimerCount;
+  CM_ARM_GENERIC_WATCHDOG_INFO                  * WatchdogInfoList;
+  CM_ARM_GTBLOCK_INFO                           * GTBlockInfo;
+  EFI_ACPI_6_2_GENERIC_TIMER_DESCRIPTION_TABLE  * Gtdt;
+  UINT32                                          Idx;
+  UINT32                                          GTBlockOffset;
+  UINT32                                          WatchdogOffset;
+
+  ASSERT (This != NULL);
+  ASSERT (AcpiTableInfo != NULL);
+  ASSERT (CfgMgrProtocol != NULL);
+  ASSERT (Table != NULL);
+  ASSERT (AcpiTableInfo->TableGeneratorId == This->GeneratorID);
+  ASSERT (AcpiTableInfo->AcpiTableSignature == This->AcpiTableSignature);
+
+  *Table = NULL;
+  Status = GetEArmObjPlatformGTBlockInfo (
+             CfgMgrProtocol,
+             CM_NULL_TOKEN,
+             &GTBlockInfo,
+             &BlockTimerCount
+             );
+  if (EFI_ERROR (Status) && (Status != EFI_NOT_FOUND)) {
+    DEBUG ((
+      DEBUG_ERROR,
+      "ERROR: GTDT: Failed to Get Platform GT Block Information." \
+      " Status = %r\n",
+      Status
+      ));
+    goto error_handler;
+  }
+
+  Status = GetEArmObjPlatformGenericWatchdogInfo (
+             CfgMgrProtocol,
+             CM_NULL_TOKEN,
+             &WatchdogInfoList,
+             &WatchdogCount
+             );
+  if (EFI_ERROR (Status) && (Status != EFI_NOT_FOUND)) {
+    DEBUG ((
+      DEBUG_ERROR,
+      "ERROR: GTDT: Failed to Get Platform Generic Watchdog Information." \
+      " Status = %r\n",
+      Status
+      ));
+    goto error_handler;
+  }
+
+  DEBUG ((
+    DEBUG_INFO,
+    "GTDT: BlockTimerCount = %d, WatchdogCount = %d\n",
+    BlockTimerCount,
+    WatchdogCount
+    ));
+
+  // Calculate the GTDT Table Size
+  PlatformTimerCount = 0;
+  TableSize = sizeof (EFI_ACPI_6_2_GENERIC_TIMER_DESCRIPTION_TABLE);
+  if (BlockTimerCount != 0) {
+    GTBlockOffset = TableSize;
+    PlatformTimerCount += BlockTimerCount;
+    TableSize += (sizeof (EFI_ACPI_6_2_GTDT_GT_BLOCK_STRUCTURE) *
+                  BlockTimerCount);
+
+    for (Idx = 0; Idx < BlockTimerCount; Idx++) {
+      if (GTBlockInfo[Idx].GTBlockTimerFrameCount > 8) {
+        Status = EFI_INVALID_PARAMETER;
+        DEBUG ((
+          DEBUG_ERROR,
+          "GTDT: GTBockFrameCount cannot be more than 8." \
+          " GTBockFrameCount = %d, Status = %r\n",
+          GTBlockInfo[Idx].GTBlockTimerFrameCount,
+          Status
+          ));
+        goto error_handler;
+      }
+      TableSize += (sizeof (EFI_ACPI_6_2_GTDT_GT_BLOCK_TIMER_STRUCTURE) *
+        GTBlockInfo[Idx].GTBlockTimerFrameCount);
+    }
+
+    DEBUG ((
+      DEBUG_INFO,
+      "GTDT: GTBockOffset = 0x%x, PLATFORM_TIMER_COUNT = %d\n",
+      GTBlockOffset,
+      PlatformTimerCount
+      ));
+  }
+
+  WatchdogOffset = 0;
+  if (WatchdogCount != 0) {
+    WatchdogOffset = TableSize;
+    PlatformTimerCount += WatchdogCount;
+    TableSize += (sizeof (EFI_ACPI_6_2_GTDT_SBSA_GENERIC_WATCHDOG_STRUCTURE) *
+                  WatchdogCount);
+    DEBUG ((
+      DEBUG_INFO,
+      "GTDT: WatchdogOffset = 0x%x, PLATFORM_TIMER_COUNT = %d\n",
+      WatchdogOffset,
+      PlatformTimerCount
+      ));
+  }
+
+  *Table = (EFI_ACPI_DESCRIPTION_HEADER*)AllocateZeroPool (TableSize);
+  if (*Table == NULL) {
+    Status = EFI_OUT_OF_RESOURCES;
+    DEBUG ((
+      DEBUG_ERROR,
+      "ERROR: GTDT: Failed to allocate memory for GTDT Table, Size = %d," \
+      " Status = %r\n",
+      TableSize,
+      Status
+      ));
+    goto error_handler;
+  }
+
+  Gtdt = (EFI_ACPI_6_2_GENERIC_TIMER_DESCRIPTION_TABLE*)*Table;
+  DEBUG ((
+    DEBUG_INFO,
+    "GTDT: Gtdt = 0x%p TableSize = 0x%x\n",
+    Gtdt,
+    TableSize
+    ));
+
+  Status = AddAcpiHeader (CfgMgrProtocol, This, &Gtdt->Header, TableSize);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((
+      DEBUG_ERROR,
+      "ERROR: GTDT: Failed to add ACPI header. Status = %r\n",
+      Status
+      ));
+    goto error_handler;
+  }
+
+  Status = AddGenericTimerInfo (
+             CfgMgrProtocol,
+             Gtdt,
+             PlatformTimerCount
+             );
+  if (EFI_ERROR (Status)) {
+    DEBUG ((
+      DEBUG_ERROR,
+      "ERROR: GTDT: Failed to add Generic Timer Info. Status = %r\n",
+      Status
+      ));
+    goto error_handler;
+  }
+
+  if (BlockTimerCount != 0) {
+    Status = AddGTBlockList (
+               CfgMgrProtocol,
+               Gtdt,
+               GTBlockOffset,
+               GTBlockInfo,
+               BlockTimerCount
+               );
+    if (EFI_ERROR (Status)) {
+      DEBUG ((
+        DEBUG_ERROR,
+        "ERROR: GTDT: Failed to add GT Block timers. Status = %r\n",
+        Status
+        ));
+      goto error_handler;
+    }
+  }
+
+  if (WatchdogCount != 0) {
+    AddGenericWatchdogList (
+      Gtdt,
+      WatchdogOffset,
+      WatchdogInfoList,
+      WatchdogCount
+      );
+  }
+
+  return Status;
+
+error_handler:
+  if (*Table != NULL) {
+    FreePool (*Table);
+    *Table = NULL;
+  }
+  return Status;
+}
+
+/** Free any resources allocated for constructing the GTDT.
+
+  @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 [in, out] Table          Pointer to the ACPI Table.
+
+  @retval EFI_SUCCESS           The resources were freed successfully.
+  @retval EFI_INVALID_PARAMETER The table pointer is NULL or invalid.
+**/
+STATIC
+EFI_STATUS
+FreeGtdtTableResources (
+  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,
+  IN OUT        EFI_ACPI_DESCRIPTION_HEADER          ** CONST Table
+)
+{
+  ASSERT (This != NULL);
+  ASSERT (AcpiTableInfo != NULL);
+  ASSERT (CfgMgrProtocol != NULL);
+  ASSERT (AcpiTableInfo->TableGeneratorId == This->GeneratorID);
+  ASSERT (AcpiTableInfo->AcpiTableSignature == This->AcpiTableSignature);
+
+  if ((Table == NULL) || (*Table == NULL)) {
+    DEBUG ((DEBUG_ERROR, "ERROR: GTDT: Invalid Table Pointer\n"));
+    ASSERT ((Table != NULL) && (*Table != NULL));
+    return EFI_INVALID_PARAMETER;
+  }
+
+  FreePool (*Table);
+  *Table = NULL;
+  return EFI_SUCCESS;
+}
+
+/** This macro defines the GTDT Table Generator revision.
+*/
+#define GTDT_GENERATOR_REVISION CREATE_REVISION (1, 0)
+
+/** The interface for the GTDT Table Generator.
+*/
+STATIC
+CONST
+ACPI_TABLE_GENERATOR GtdtGenerator = {
+  // Generator ID
+  CREATE_STD_ACPI_TABLE_GEN_ID (ESTD_ACPI_TABLE_ID_GTDT),
+  // Generator Description
+  L"ACPI.STD.GTDT.GENERATOR",
+  // ACPI Table Signature
+  EFI_ACPI_6_2_GENERIC_TIMER_DESCRIPTION_TABLE_SIGNATURE,
+  // ACPI Table Revision
+  EFI_ACPI_6_2_GENERIC_TIMER_DESCRIPTION_TABLE_REVISION,
+  // Creator ID
+  TABLE_GENERATOR_CREATOR_ID_ARM,
+  // Creator Revision
+  GTDT_GENERATOR_REVISION,
+  // Build Table function
+  BuildGtdtTable,
+  // Free Resource function
+  FreeGtdtTableResources
+};
+
+/** 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
+AcpiGtdtLibConstructor (
+  IN CONST EFI_HANDLE                ImageHandle,
+  IN       EFI_SYSTEM_TABLE  * CONST SystemTable
+  )
+{
+  EFI_STATUS  Status;
+  Status = RegisterAcpiTableGenerator (&GtdtGenerator);
+  DEBUG ((DEBUG_INFO, "GTDT: 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
+AcpiGtdtLibDestructor (
+  IN CONST EFI_HANDLE                ImageHandle,
+  IN       EFI_SYSTEM_TABLE  * CONST SystemTable
+  )
+{
+  EFI_STATUS  Status;
+  Status = DeregisterAcpiTableGenerator (&GtdtGenerator);
+  DEBUG ((DEBUG_INFO, "GTDT: Deregister Generator. Status = %r\n", Status));
+  ASSERT_EFI_ERROR (Status);
+  return Status;
+}
-- 
'Guid(CE165669-3EF3-493F-B85D-6190EE5B9759)'




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