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/** @file
* Generic Timer Description Table (GTDT)
*
* Copyright (c) 2012 - 2014, 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.
*
**/
#include "ArmPlatform.h"
#include <Library/AcpiLib.h>
#include <Library/PcdLib.h>
#include <IndustryStandard/Acpi.h>
#define GTDT_GLOBAL_FLAGS_MAPPED EFI_ACPI_5_0_GTDT_GLOBAL_FLAG_MEMORY_MAPPED_BLOCK_PRESENT
#define GTDT_GLOBAL_FLAGS_NOT_MAPPED 0
#define GTDT_GLOBAL_FLAGS_EDGE EFI_ACPI_5_0_GTDT_GLOBAL_FLAG_INTERRUPT_MODE
#define GTDT_GLOBAL_FLAGS_LEVEL 0
// Note: We could have a build flag that switches between memory mapped/non-memory mapped timer
#ifdef SYSTEM_TIMER_BASE_ADDRESS
#define GTDT_GLOBAL_FLAGS (GTDT_GLOBAL_FLAGS_MAPPED | GTDT_GLOBAL_FLAGS_LEVEL)
#else
#define GTDT_GLOBAL_FLAGS (GTDT_GLOBAL_FLAGS_NOT_MAPPED | GTDT_GLOBAL_FLAGS_LEVEL)
#define SYSTEM_TIMER_BASE_ADDRESS 0
#endif
#define GTDT_TIMER_EDGE_TRIGGERED (1 << EFI_ACPI_5_0_GTDT_TIMER_FLAG_TIMER_INTERRUPT_MODE)
#define GTDT_TIMER_LEVEL_TRIGGERED (0 << EFI_ACPI_5_0_GTDT_TIMER_FLAG_TIMER_INTERRUPT_MODE)
#define GTDT_TIMER_ACTIVE_LOW (1 << EFI_ACPI_5_0_GTDT_TIMER_FLAG_TIMER_INTERRUPT_POLARITY)
#define GTDT_TIMER_ACTIVE_HIGH (0 << EFI_ACPI_5_0_GTDT_TIMER_FLAG_TIMER_INTERRUPT_POLARITY)
#define GTDT_GTIMER_FLAGS (GTDT_TIMER_ACTIVE_LOW | GTDT_TIMER_LEVEL_TRIGGERED)
EFI_ACPI_5_0_GENERIC_TIMER_DESCRIPTION_TABLE Gtdt = {
ARM_ACPI_HEADER(
EFI_ACPI_5_0_GENERIC_TIMER_DESCRIPTION_TABLE_SIGNATURE,
EFI_ACPI_5_0_GENERIC_TIMER_DESCRIPTION_TABLE,
EFI_ACPI_5_0_GENERIC_TIMER_DESCRIPTION_TABLE_REVISION
),
SYSTEM_TIMER_BASE_ADDRESS, // UINT64 PhysicalAddress
GTDT_GLOBAL_FLAGS, // UINT32 GlobalFlags
FixedPcdGet32 (PcdArmArchTimerSecIntrNum), // UINT32 SecurePL1TimerGSIV
GTDT_GTIMER_FLAGS, // UINT32 SecurePL1TimerFlags
FixedPcdGet32 (PcdArmArchTimerIntrNum), // UINT32 NonSecurePL1TimerGSIV
GTDT_GTIMER_FLAGS, // UINT32 NonSecurePL1TimerFlags
FixedPcdGet32 (PcdArmArchTimerVirtIntrNum), // UINT32 VirtualTimerGSIV
GTDT_GTIMER_FLAGS, // UINT32 VirtualTimerFlags
FixedPcdGet32 (PcdArmArchTimerHypIntrNum), // UINT32 NonSecurePL2TimerGSIV
GTDT_GTIMER_FLAGS // UINT32 NonSecurePL2TimerFlags
};
VOID*
ReferenceAcpiTable (
VOID
)
{
//
// Reference the table being generated to prevent the optimizer from removing the
// data structure from the exeutable
//
return (VOID*)&Gtdt;
}
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