DynamicTablesPkg: SSDT Serial Port Fixup library

According to Arm Server Base Boot Requirements,
Platform Design Document version 1.2 revision D,
September 2, 2019, section '4.2.1.8 SPCR'; The
SPCR console device must be included in the DSDT.

Additionally, it is often desirable to describe the
serial ports available on a platform so that they
are available for use by a rich OS.

To facilitate the description of serial ports on a
platform a common SSDT Serial Port Fixup library is
introduced. It provides interfaces to build a SSDT
serial port definition block table based on the
serial port information.

The SSDT Serial Port Fixup library is used by the
SPCR, DBG2 and SSDT Serial Port generator to describe
the serial port information in a definition block.

  +------------+   +------------+   +------------+
  |  SPCR Gen  |   |  DBG2 Gen  |   | SERIAL Gen |
  +------------+   +------------+   +------------+
        +----------------------------------+
        |  SSDT Serial Port Fixup library  |
        +----------------------------------+

The SSDT Serial Port Fixup library:
  - Parses the SSDT Serial Port template using the
    AmlLib library to generate an AML tree.
  - Updates the _UID, _HID and _CID values.
  - Fixes up the Serial port base address, length
    and the interrupt number in the _CRS descriptor.
  - Fixes up the serial-port name.
  - Serialises the AML Tree to a buffer containing
    the definition block data.
  The definition block data is then installed by the
  corresponding table generator.

Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
Reviewed-by: Alexei Fedorov <Alexei.Fedorov@arm.com>

DynamicTablesPkg/Include/AcpiTableGenerator.h

@@ -1,6 +1,6 @@
 /** @file
 
-  Copyright (c) 2017 - 2019, ARM Limited. All rights reserved.
+  Copyright (c) 2017 - 2020, Arm Limited. All rights reserved.<BR>
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
@@ -55,6 +55,10 @@ The Dynamic Tables Framework implements the following ACPI table generators:
             the Configuration Manager and builds the PPTT table.
   - SRAT  : The SRAT generator collates the system resource affinity information
             from the Configuration Manager and builds the SRAT table.
+  - SSDT Serial-Port:
+            The SSDT Serial generator collates the Serial port information
+            from the Configuration Manager and patches the SSDT Serial Port
+            template to build the SSDT Serial port table.
 */
 
 /** The ACPI_TABLE_GENERATOR_ID type describes ACPI table generator ID.
@@ -78,6 +82,7 @@ typedef enum StdAcpiTableId {
   EStdAcpiTableIdIort,                          ///< IORT Generator
   EStdAcpiTableIdPptt,                          ///< PPTT Generator
   EStdAcpiTableIdSrat,                          ///< SRAT Generator
+  EStdAcpiTableIdSsdtSerialPort,                ///< SSDT Serial-Port Generator
   EStdAcpiTableIdMax
 } ESTD_ACPI_TABLE_ID;
 

DynamicTablesPkg/Include/ArmNameSpaceObjects.h

@@ -1,6 +1,6 @@
 /** @file
 
-  Copyright (c) 2017 - 2020, ARM Limited. All rights reserved.
+  Copyright (c) 2017 - 2020, Arm Limited. All rights reserved.<BR>
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
@@ -56,6 +56,7 @@ typedef enum ArmObjectID {
   EArmObjDeviceHandleAcpi,             ///< 32 - Device Handle Acpi
   EArmObjDeviceHandlePci,              ///< 33 - Device Handle Pci
   EArmObjGenericInitiatorAffinityInfo, ///< 34 - Generic Initiator Affinity
+  EArmObjSerialPortInfo,               ///< 35 - Generic Serial Port Info
   EArmObjMax
 } EARM_OBJECT_ID;
 
@@ -270,7 +271,8 @@ typedef struct CmArmGicItsInfo {
     Serial Port information for the Platform.
 
     ID: EArmObjSerialConsolePortInfo or
-        EArmObjSerialDebugPortInfo
+        EArmObjSerialDebugPortInfo or
+        EArmObjSerialPortInfo
 */
 typedef struct CmArmSerialPortInfo {
   /// The physical base address for the serial port
@@ -287,6 +289,9 @@ typedef struct CmArmSerialPortInfo {
 
   /// Serial Port subtype
   UINT16  PortSubtype;
+
+  /// The Base address length
+  UINT64  BaseAddressLength;
 } CM_ARM_SERIAL_PORT_INFO;
 
 /** A structure that describes the

DynamicTablesPkg/Include/Library/SsdtSerialPortFixupLib.h

@@ -0,0 +1,68 @@
+/** @file
+  Ssdt Serial Port Fixup Library
+
+  Copyright (c) 2020, Arm Limited. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#ifndef SSDT_SERIAL_PORT_LIB_H_
+#define SSDT_SERIAL_PORT_LIB_H_
+
+/** Build a SSDT table describing the input serial port.
+
+  The table created by this function must be freed by FreeSsdtSerialTable.
+
+  @param [in]  AcpiTableInfo    Pointer to the ACPI table information.
+  @param [in]  SerialPortInfo   Serial port to describe in the SSDT table.
+  @param [in]  Name             The Name to give to the Device.
+                                Must be a NULL-terminated ASL NameString
+                                e.g.: "DEV0", "DV15.DEV0", etc.
+  @param [in]  Uid              UID for the Serial Port.
+  @param [out] Table            If success, pointer to the created SSDT table.
+
+  @retval EFI_SUCCESS            Table generated successfully.
+  @retval EFI_INVALID_PARAMETER  A parameter is invalid.
+  @retval EFI_NOT_FOUND          Could not find information.
+  @retval EFI_OUT_OF_RESOURCES   Could not allocate memory.
+**/
+EFI_STATUS
+EFIAPI
+BuildSsdtSerialPortTable (
+  IN  CONST CM_STD_OBJ_ACPI_TABLE_INFO    *  AcpiTableInfo,
+  IN  CONST CM_ARM_SERIAL_PORT_INFO       *  SerialPortInfo,
+  IN  CONST CHAR8                         *  Name,
+  IN  CONST UINT64                           Uid,
+  OUT       EFI_ACPI_DESCRIPTION_HEADER  **  Table
+  );
+
+/** Free an SSDT table previously created by
+    the BuildSsdtSerialTable function.
+
+  @param [in] Table   Pointer to a SSDT table allocated by
+                      the BuildSsdtSerialTable function.
+
+  @retval EFI_SUCCESS           Success.
+**/
+EFI_STATUS
+EFIAPI
+FreeSsdtSerialPortTable (
+  IN EFI_ACPI_DESCRIPTION_HEADER  * Table
+  );
+
+/** Validate the Serial Port Information.
+
+  @param [in]  SerialPortInfoTable    Table of CM_ARM_SERIAL_PORT_INFO.
+  @param [in]  SerialPortCount        Count of SerialPort in the table.
+
+  @retval EFI_SUCCESS             Success.
+  @retval EFI_INVALID_PARAMETER   Invalid parameter.
+**/
+EFI_STATUS
+EFIAPI
+ValidateSerialPortInfo (
+  IN  CONST CM_ARM_SERIAL_PORT_INFO  * SerialPortInfoTable,
+  IN        UINT32                     SerialPortCount
+  );
+
+#endif // SSDT_SERIAL_PORT_LIB_H_