+/** @file\r
+* Generic Timer Description Table (GTDT)\r
+*\r
+* Copyright (c) 2012 - 2014, ARM Limited. All rights reserved.\r
+*\r
+* This program and the accompanying materials\r
+* are licensed and made available under the terms and conditions of the BSD License\r
+* which accompanies this distribution. The full text of the license may be found at\r
+* http://opensource.org/licenses/bsd-license.php\r
+*\r
+* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
+* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+*\r
+**/\r
+\r
+#include "ArmPlatform.h"\r
+#include <Library/AcpiLib.h>\r
+#include <Library/PcdLib.h>\r
+#include <IndustryStandard/Acpi.h>\r
+\r
+#define GTDT_GLOBAL_FLAGS_MAPPED EFI_ACPI_5_0_GTDT_GLOBAL_FLAG_MEMORY_MAPPED_BLOCK_PRESENT\r
+#define GTDT_GLOBAL_FLAGS_NOT_MAPPED 0\r
+#define GTDT_GLOBAL_FLAGS_EDGE EFI_ACPI_5_0_GTDT_GLOBAL_FLAG_INTERRUPT_MODE\r
+#define GTDT_GLOBAL_FLAGS_LEVEL 0\r
+\r
+// Note: We could have a build flag that switches between memory mapped/non-memory mapped timer\r
+#ifdef SYSTEM_TIMER_BASE_ADDRESS\r
+ #define GTDT_GLOBAL_FLAGS (GTDT_GLOBAL_FLAGS_MAPPED | GTDT_GLOBAL_FLAGS_LEVEL)\r
+#else\r
+ #define GTDT_GLOBAL_FLAGS (GTDT_GLOBAL_FLAGS_NOT_MAPPED | GTDT_GLOBAL_FLAGS_LEVEL)\r
+ #define SYSTEM_TIMER_BASE_ADDRESS 0\r
+#endif\r
+\r
+#define GTDT_TIMER_EDGE_TRIGGERED (1 << EFI_ACPI_5_0_GTDT_TIMER_FLAG_TIMER_INTERRUPT_MODE)\r
+#define GTDT_TIMER_LEVEL_TRIGGERED (0 << EFI_ACPI_5_0_GTDT_TIMER_FLAG_TIMER_INTERRUPT_MODE)\r
+#define GTDT_TIMER_ACTIVE_LOW (1 << EFI_ACPI_5_0_GTDT_TIMER_FLAG_TIMER_INTERRUPT_POLARITY)\r
+#define GTDT_TIMER_ACTIVE_HIGH (0 << EFI_ACPI_5_0_GTDT_TIMER_FLAG_TIMER_INTERRUPT_POLARITY)\r
+\r
+#define GTDT_GTIMER_FLAGS (GTDT_TIMER_ACTIVE_LOW | GTDT_TIMER_LEVEL_TRIGGERED)\r
+\r
+EFI_ACPI_5_0_GENERIC_TIMER_DESCRIPTION_TABLE Gtdt = {\r
+ ARM_ACPI_HEADER(\r
+ EFI_ACPI_5_0_GENERIC_TIMER_DESCRIPTION_TABLE_SIGNATURE,\r
+ EFI_ACPI_5_0_GENERIC_TIMER_DESCRIPTION_TABLE,\r
+ EFI_ACPI_5_0_GENERIC_TIMER_DESCRIPTION_TABLE_REVISION\r
+ ),\r
+ SYSTEM_TIMER_BASE_ADDRESS, // UINT64 PhysicalAddress\r
+ GTDT_GLOBAL_FLAGS, // UINT32 GlobalFlags\r
+ FixedPcdGet32 (PcdArmArchTimerSecIntrNum), // UINT32 SecurePL1TimerGSIV\r
+ GTDT_GTIMER_FLAGS, // UINT32 SecurePL1TimerFlags\r
+ FixedPcdGet32 (PcdArmArchTimerIntrNum), // UINT32 NonSecurePL1TimerGSIV\r
+ GTDT_GTIMER_FLAGS, // UINT32 NonSecurePL1TimerFlags\r
+ FixedPcdGet32 (PcdArmArchTimerVirtIntrNum), // UINT32 VirtualTimerGSIV\r
+ GTDT_GTIMER_FLAGS, // UINT32 VirtualTimerFlags\r
+ FixedPcdGet32 (PcdArmArchTimerHypIntrNum), // UINT32 NonSecurePL2TimerGSIV\r
+ GTDT_GTIMER_FLAGS // UINT32 NonSecurePL2TimerFlags\r
+};\r
+\r
+\r
+VOID*\r
+ReferenceAcpiTable (\r
+ VOID\r
+ )\r
+{\r
+ //\r
+ // Reference the table being generated to prevent the optimizer from removing the\r
+ // data structure from the exeutable\r
+ //\r
+ return (VOID*)&Gtdt;\r
+}\r