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