2 * Generic Timer Description Table (GTDT)
4 * Copyright (c) 2012 - 2014, ARM Limited. All rights reserved.
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
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.
16 #include "ArmPlatform.h"
17 #include <Library/AcpiLib.h>
18 #include <Library/PcdLib.h>
19 #include <IndustryStandard/Acpi.h>
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
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)
30 #define GTDT_GLOBAL_FLAGS (GTDT_GLOBAL_FLAGS_NOT_MAPPED | GTDT_GLOBAL_FLAGS_LEVEL)
31 #define SYSTEM_TIMER_BASE_ADDRESS 0
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)
39 #define GTDT_GTIMER_FLAGS (GTDT_TIMER_ACTIVE_LOW | GTDT_TIMER_LEVEL_TRIGGERED)
41 EFI_ACPI_5_0_GENERIC_TIMER_DESCRIPTION_TABLE Gtdt = {
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
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
66 // Reference the table being generated to prevent the optimizer from removing the
67 // data structure from the exeutable