| 1 | /** @file
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| 2 | ACPI Low Power Idle Table (LPIT) definitions
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| 3 |
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| 4 | Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
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| 5 | SPDX-License-Identifier: BSD-2-Clause-Patent
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| 6 |
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| 7 | @par Revision Reference:
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| 8 | - ACPI Low Power Idle Table (LPIT) Revision 001, dated July 2014
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| 9 | http://www.uefi.org/sites/default/files/resources/ACPI_Low_Power_Idle_Table.pdf
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| 10 |
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| 11 | @par Glossary:
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| 12 | - GAS - Generic Address Structure
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| 13 | - LPI - Low Power Idle
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| 14 | **/
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| 15 |
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| 16 | #ifndef _LOW_POWER_IDLE_TABLE_H_
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| 17 | #define _LOW_POWER_IDLE_TABLE_H_
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| 18 |
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| 19 | #include <IndustryStandard/Acpi.h>
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| 20 |
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| 21 | #pragma pack(1)
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| 22 |
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| 23 | ///
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| 24 | /// LPI Structure Types
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| 25 | ///
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| 26 | #define ACPI_LPI_STRUCTURE_TYPE_NATIVE_CSTATE 0x00
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| 27 |
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| 28 | ///
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| 29 | /// Low Power Idle (LPI) State Flags
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| 30 | ///
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| 31 | typedef union {
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| 32 | struct {
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| 33 | UINT32 Disabled : 1; ///< If set, LPI state is not used
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| 34 |
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| 35 | /**
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| 36 | If set, Residency counter is not available for this LPI state and
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| 37 | Residency Counter Frequency is invalid
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| 38 | **/
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| 39 | UINT32 CounterUnavailable : 1;
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| 40 | UINT32 Reserved : 30; ///< Reserved for future use. Must be zero
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| 41 | } Bits;
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| 42 | UINT32 Data32;
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| 43 | } ACPI_LPI_STATE_FLAGS;
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| 44 |
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| 45 | ///
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| 46 | /// Low Power Idle (LPI) structure with Native C-state instruction entry trigger descriptor
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| 47 | ///
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| 48 | typedef struct {
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| 49 | UINT32 Type; ///< LPI State descriptor Type 0
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| 50 | UINT32 Length; ///< Length of LPI state Descriptor Structure
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| 51 | ///
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| 52 | /// Unique LPI state identifier: zero based, monotonically increasing identifier
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| 53 | ///
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| 54 | UINT16 UniqueId;
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| 55 | UINT8 Reserved[2]; ///< Must be Zero
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| 56 | ACPI_LPI_STATE_FLAGS Flags; ///< LPI state flags
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| 57 |
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| 58 | /**
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| 59 | The LPI entry trigger, matching an existing _CST.Register object, represented as a
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| 60 | Generic Address Structure. All processors must request this state or deeper to trigger.
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| 61 | **/
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| 62 | EFI_ACPI_6_1_GENERIC_ADDRESS_STRUCTURE EntryTrigger;
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| 63 | UINT32 Residency; ///< Minimum residency or break-even in uSec
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| 64 | UINT32 Latency; ///< Worst case exit latency in uSec
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| 65 |
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| 66 | /**
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| 67 | [optional] Residency counter, represented as a Generic Address Structure.
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| 68 | If not present, Flags[1] bit should be set.
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| 69 | **/
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| 70 | EFI_ACPI_6_1_GENERIC_ADDRESS_STRUCTURE ResidencyCounter;
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| 71 |
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| 72 | /**
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| 73 | [optional] Residency counter frequency in cycles per second. Value 0 indicates that
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| 74 | counter runs at TSC frequency. Valid only if Residency Counter is present.
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| 75 | **/
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| 76 | UINT64 ResidencyCounterFrequency;
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| 77 | } ACPI_LPI_NATIVE_CSTATE_DESCRIPTOR;
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| 78 |
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| 79 | #pragma pack()
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| 80 |
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| 81 | #endif
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