| /** @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 |