| 1 | /** @file
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| 2 | ACPI high precision event timer table definition, at www.intel.com
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| 3 | Specification name is IA-PC HPET (High Precision Event Timers) Specification.
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| 4 |
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| 5 | Copyright (c) 2007 - 2018, Intel Corporation. All rights reserved.<BR>
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| 6 | SPDX-License-Identifier: BSD-2-Clause-Patent
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| 7 | **/
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| 8 |
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| 9 | #ifndef _HIGH_PRECISION_EVENT_TIMER_TABLE_H_
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| 10 | #define _HIGH_PRECISION_EVENT_TIMER_TABLE_H_
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| 11 |
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| 12 | #include <IndustryStandard/Acpi.h>
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| 13 |
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| 14 | //
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| 15 | // Ensure proper structure formats
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| 16 | //
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| 17 | #pragma pack(1)
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| 18 |
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| 19 | ///
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| 20 | /// HPET Event Timer Block ID described in IA-PC HPET Specification, 3.2.4.
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| 21 | ///
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| 22 | typedef union {
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| 23 | struct {
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| 24 | UINT32 Revision : 8;
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| 25 | UINT32 NumberOfTimers : 5;
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| 26 | UINT32 CounterSize : 1;
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| 27 | UINT32 Reserved : 1;
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| 28 | UINT32 LegacyRoute : 1;
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| 29 | UINT32 VendorId : 16;
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| 30 | } Bits;
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| 31 | UINT32 Uint32;
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| 32 | } EFI_ACPI_HIGH_PRECISION_EVENT_TIMER_BLOCK_ID;
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| 33 |
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| 34 | ///
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| 35 | /// High Precision Event Timer Table header definition.
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| 36 | ///
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| 37 | typedef struct {
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| 38 | EFI_ACPI_DESCRIPTION_HEADER Header;
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| 39 | UINT32 EventTimerBlockId;
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| 40 | EFI_ACPI_2_0_GENERIC_ADDRESS_STRUCTURE BaseAddressLower32Bit;
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| 41 | UINT8 HpetNumber;
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| 42 | UINT16 MainCounterMinimumClockTickInPeriodicMode;
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| 43 | UINT8 PageProtectionAndOemAttribute;
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| 44 | } EFI_ACPI_HIGH_PRECISION_EVENT_TIMER_TABLE_HEADER;
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| 45 |
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| 46 | ///
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| 47 | /// HPET Revision (defined in spec)
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| 48 | ///
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| 49 | #define EFI_ACPI_HIGH_PRECISION_EVENT_TIMER_TABLE_REVISION 0x01
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| 50 |
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| 51 | //
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| 52 | // Page protection setting
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| 53 | // Values 3 through 15 are reserved for use by the specification
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| 54 | //
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| 55 | #define EFI_ACPI_NO_PAGE_PROTECTION 0
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| 56 | #define EFI_ACPI_4KB_PAGE_PROTECTION 1
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| 57 | #define EFI_ACPI_64KB_PAGE_PROTECTION 2
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| 58 |
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| 59 | #pragma pack()
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| 60 |
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| 61 | #endif
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