ArmPlatformPkg/ArmJunoPkg/AcpiTables/Gtdt.aslc

   1 /** @file
   2 *  Generic Timer Description Table (GTDT)
   3 *
   4 *  Copyright (c) 2012 - 2014, ARM Limited. All rights reserved.
   5 *
   6 *  This program and the accompanying materials
   7 *  are licensed and made available under the terms and conditions of the BSD License
   8 *  which accompanies this distribution.  The full text of the license may be found at
   9 *  http://opensource.org/licenses/bsd-license.php
  10 *
  11 *  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12 *  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13 *
  14 **/
  15
  16 #include "ArmPlatform.h"
  17 #include <Library/AcpiLib.h>
  18 #include <Library/PcdLib.h>
  19 #include <IndustryStandard/Acpi.h>
  20
  21 #define GTDT_GLOBAL_FLAGS_MAPPED      EFI_ACPI_5_0_GTDT_GLOBAL_FLAG_MEMORY_MAPPED_BLOCK_PRESENT
  22 #define GTDT_GLOBAL_FLAGS_NOT_MAPPED  0
  23 #define GTDT_GLOBAL_FLAGS_EDGE        EFI_ACPI_5_0_GTDT_GLOBAL_FLAG_INTERRUPT_MODE
  24 #define GTDT_GLOBAL_FLAGS_LEVEL       0
  25
  26 // Note: We could have a build flag that switches between memory mapped/non-memory mapped timer
  27 #ifdef SYSTEM_TIMER_BASE_ADDRESS
  28   #define GTDT_GLOBAL_FLAGS             (GTDT_GLOBAL_FLAGS_MAPPED | GTDT_GLOBAL_FLAGS_LEVEL)
  29 #else
  30   #define GTDT_GLOBAL_FLAGS             (GTDT_GLOBAL_FLAGS_NOT_MAPPED | GTDT_GLOBAL_FLAGS_LEVEL)
  31   #define SYSTEM_TIMER_BASE_ADDRESS     0
  32 #endif
  33
  34 #define GTDT_TIMER_EDGE_TRIGGERED   (1 << EFI_ACPI_5_0_GTDT_TIMER_FLAG_TIMER_INTERRUPT_MODE)
  35 #define GTDT_TIMER_LEVEL_TRIGGERED  (0 << EFI_ACPI_5_0_GTDT_TIMER_FLAG_TIMER_INTERRUPT_MODE)
  36 #define GTDT_TIMER_ACTIVE_LOW       (1 << EFI_ACPI_5_0_GTDT_TIMER_FLAG_TIMER_INTERRUPT_POLARITY)
  37 #define GTDT_TIMER_ACTIVE_HIGH      (0 << EFI_ACPI_5_0_GTDT_TIMER_FLAG_TIMER_INTERRUPT_POLARITY)
  38
  39 #define GTDT_GTIMER_FLAGS           (GTDT_TIMER_ACTIVE_LOW | GTDT_TIMER_LEVEL_TRIGGERED)
  40
  41 EFI_ACPI_5_0_GENERIC_TIMER_DESCRIPTION_TABLE Gtdt = {
  42     ARM_ACPI_HEADER(
  43       EFI_ACPI_5_0_GENERIC_TIMER_DESCRIPTION_TABLE_SIGNATURE,
  44       EFI_ACPI_5_0_GENERIC_TIMER_DESCRIPTION_TABLE,
  45       EFI_ACPI_5_0_GENERIC_TIMER_DESCRIPTION_TABLE_REVISION
  46     ),
  47   SYSTEM_TIMER_BASE_ADDRESS,                    // UINT64  PhysicalAddress
  48   GTDT_GLOBAL_FLAGS,                            // UINT32  GlobalFlags
  49   FixedPcdGet32 (PcdArmArchTimerSecIntrNum),    // UINT32  SecurePL1TimerGSIV
  50   GTDT_GTIMER_FLAGS,                            // UINT32  SecurePL1TimerFlags
  51   FixedPcdGet32 (PcdArmArchTimerIntrNum),       // UINT32  NonSecurePL1TimerGSIV
  52   GTDT_GTIMER_FLAGS,                            // UINT32  NonSecurePL1TimerFlags
  53   FixedPcdGet32 (PcdArmArchTimerVirtIntrNum),   // UINT32  VirtualTimerGSIV
  54   GTDT_GTIMER_FLAGS,                            // UINT32  VirtualTimerFlags
  55   FixedPcdGet32 (PcdArmArchTimerHypIntrNum),    // UINT32  NonSecurePL2TimerGSIV
  56   GTDT_GTIMER_FLAGS                             // UINT32  NonSecurePL2TimerFlags
  57 };
  58
  59
  60 VOID*
  61 ReferenceAcpiTable (
  62   VOID
  63   )
  64 {
  65   //
  66   // Reference the table being generated to prevent the optimizer from removing the
  67   // data structure from the exeutable
  68   //
  69   return (VOID*)&Gtdt;
  70 }