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/** @file
ACPI high precision event timer table definition, at www.intel.com
Specification name is IA-PC HPET (High Precision Event Timers) Specification.
Copyright (c) 2007 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef _HIGH_PRECISION_EVENT_TIMER_TABLE_H_
#define _HIGH_PRECISION_EVENT_TIMER_TABLE_H_
#include <IndustryStandard/Acpi.h>
//
// Ensure proper structure formats
//
#pragma pack(1)
///
/// HPET Event Timer Block ID described in IA-PC HPET Specification, 3.2.4.
///
typedef union {
struct {
UINT32 Revision : 8;
UINT32 NumberOfTimers : 5;
UINT32 CounterSize : 1;
UINT32 Reserved : 1;
UINT32 LegacyRoute : 1;
UINT32 VendorId : 16;
} Bits;
UINT32 Uint32;
} EFI_ACPI_HIGH_PRECISION_EVENT_TIMER_BLOCK_ID;
///
/// High Precision Event Timer Table header definition.
///
typedef struct {
EFI_ACPI_DESCRIPTION_HEADER Header;
UINT32 EventTimerBlockId;
EFI_ACPI_2_0_GENERIC_ADDRESS_STRUCTURE BaseAddressLower32Bit;
UINT8 HpetNumber;
UINT16 MainCounterMinimumClockTickInPeriodicMode;
UINT8 PageProtectionAndOemAttribute;
} EFI_ACPI_HIGH_PRECISION_EVENT_TIMER_TABLE_HEADER;
///
/// HPET Revision (defined in spec)
///
#define EFI_ACPI_HIGH_PRECISION_EVENT_TIMER_TABLE_REVISION 0x01
//
// Page protection setting
// Values 3 through 15 are reserved for use by the specification
//
#define EFI_ACPI_NO_PAGE_PROTECTION 0
#define EFI_ACPI_4KB_PAGE_PROTECTION 1
#define EFI_ACPI_64KB_PAGE_PROTECTION 2
#pragma pack()
#endif
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