/** @file
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* Generic Timer Description Table (GTDT)
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*
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* Copyright (c) 2018, Linaro Limited. All rights reserved.
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* Copyright (c) 2012 - 2016, ARM Limited. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-2-Clause-Patent
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*
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**/
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#include "ArmPlatform.h"
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#include <Library/AcpiLib.h>
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#include <Library/PcdLib.h>
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#include <IndustryStandard/Acpi.h>
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#define GTDT_GLOBAL_FLAGS_MAPPED EFI_ACPI_5_0_GTDT_GLOBAL_FLAG_MEMORY_MAPPED_BLOCK_PRESENT
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#define GTDT_GLOBAL_FLAGS_NOT_MAPPED 0
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#define GTDT_GLOBAL_FLAGS_EDGE EFI_ACPI_5_0_GTDT_GLOBAL_FLAG_INTERRUPT_MODE
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#define GTDT_GLOBAL_FLAGS_LEVEL 0
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// Note: We could have a build flag that switches between memory mapped/non-memory mapped timer
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#ifdef SYSTEM_TIMER_BASE_ADDRESS
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#define GTDT_GLOBAL_FLAGS (GTDT_GLOBAL_FLAGS_MAPPED | GTDT_GLOBAL_FLAGS_LEVEL)
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#else
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#define GTDT_GLOBAL_FLAGS (GTDT_GLOBAL_FLAGS_NOT_MAPPED | GTDT_GLOBAL_FLAGS_LEVEL)
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#define SYSTEM_TIMER_BASE_ADDRESS 0xFFFFFFFFFFFFFFFF
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#endif
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#define GTDT_TIMER_EDGE_TRIGGERED EFI_ACPI_5_0_GTDT_TIMER_FLAG_TIMER_INTERRUPT_MODE
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#define GTDT_TIMER_LEVEL_TRIGGERED 0
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#define GTDT_TIMER_ACTIVE_LOW EFI_ACPI_5_0_GTDT_TIMER_FLAG_TIMER_INTERRUPT_POLARITY
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#define GTDT_TIMER_ACTIVE_HIGH 0
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#define GTDT_GTIMER_FLAGS (GTDT_TIMER_ACTIVE_LOW | GTDT_TIMER_LEVEL_TRIGGERED)
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#define EFI_ACPI_ARM_OEM_ID 'A','R','M','L','T','D' // OEMID 6 bytes long
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#define EFI_ACPI_ARM_OEM_TABLE_ID SIGNATURE_64('A','R','M','-','J','U','N','O') // OEM table id 8 bytes long
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#define EFI_ACPI_ARM_OEM_REVISION 0x20140727
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#define EFI_ACPI_ARM_CREATOR_ID SIGNATURE_32('A','R','M',' ')
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#define EFI_ACPI_ARM_CREATOR_REVISION 0x00000099
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#define ARM_ACPI_HEADER(Signature, Type, Revision) { \
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Signature, /* UINT32 Signature */ \
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sizeof (Type), /* UINT32 Length */ \
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Revision, /* UINT8 Revision */ \
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0, /* UINT8 Checksum */ \
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{ EFI_ACPI_ARM_OEM_ID }, /* UINT8 OemId[6] */ \
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EFI_ACPI_ARM_OEM_TABLE_ID, /* UINT64 OemTableId */ \
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EFI_ACPI_ARM_OEM_REVISION, /* UINT32 OemRevision */ \
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EFI_ACPI_ARM_CREATOR_ID, /* UINT32 CreatorId */ \
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EFI_ACPI_ARM_CREATOR_REVISION /* UINT32 CreatorRevision */ \
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}
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#pragma pack (1)
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typedef struct {
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EFI_ACPI_5_1_GENERIC_TIMER_DESCRIPTION_TABLE Gtdt;
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} GENERIC_TIMER_DESCRIPTION_TABLE;
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#pragma pack ()
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GENERIC_TIMER_DESCRIPTION_TABLE Gtdt = {
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{
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ARM_ACPI_HEADER(
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EFI_ACPI_5_1_GENERIC_TIMER_DESCRIPTION_TABLE_SIGNATURE,
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GENERIC_TIMER_DESCRIPTION_TABLE,
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EFI_ACPI_5_1_GENERIC_TIMER_DESCRIPTION_TABLE_REVISION
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),
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SYSTEM_TIMER_BASE_ADDRESS, // UINT64 PhysicalAddress
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0, // UINT32 Reserved
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FixedPcdGet32 (PcdArmArchTimerSecIntrNum), // UINT32 SecurePL1TimerGSIV
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GTDT_GTIMER_FLAGS, // UINT32 SecurePL1TimerFlags
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FixedPcdGet32 (PcdArmArchTimerIntrNum), // UINT32 NonSecurePL1TimerGSIV
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GTDT_GTIMER_FLAGS, // UINT32 NonSecurePL1TimerFlags
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FixedPcdGet32 (PcdArmArchTimerVirtIntrNum), // UINT32 VirtualTimerGSIV
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GTDT_GTIMER_FLAGS, // UINT32 VirtualTimerFlags
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FixedPcdGet32 (PcdArmArchTimerHypIntrNum), // UINT32 NonSecurePL2TimerGSIV
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GTDT_GTIMER_FLAGS, // UINT32 NonSecurePL2TimerFlags
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0xFFFFFFFFFFFFFFFF, // UINT64 CntReadBasePhysicalAddress
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0, // UINT32 PlatformTimerCount
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},
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};
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//
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// Reference the table being generated to prevent the optimizer
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// from removing the data structure from the executable
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//
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VOID* CONST ReferenceAcpiTable = &Gtdt;
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