audk/PcAtChipsetPkg/Include/Register/Hpet.h

/** @file
  HPET register definitions from the IA-PC HPET (High Precision Event Timers)
  Specification, Revision 1.0a, October 2004.

  Copyright (c) 2011 - 2018, Intel Corporation. All rights reserved.<BR>
  SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#ifndef __HPET_REGISTER_H__
#define __HPET_REGISTER_H__

///
/// HPET General Register Offsets
///
#define HPET_GENERAL_CAPABILITIES_ID_OFFSET   0x000
#define HPET_GENERAL_CONFIGURATION_OFFSET     0x010
#define HPET_GENERAL_INTERRUPT_STATUS_OFFSET  0x020

///
/// HPET Timer Register Offsets
///
#define HPET_MAIN_COUNTER_OFFSET              0x0F0
#define HPET_TIMER_CONFIGURATION_OFFSET       0x100
#define HPET_TIMER_COMPARATOR_OFFSET          0x108
#define HPET_TIMER_MSI_ROUTE_OFFSET           0x110

///
/// Stride between sets of HPET Timer Registers
///
#define HPET_TIMER_STRIDE         0x20

#pragma pack(1)

///
/// HPET General Capabilities and ID Register
///
typedef union {
  struct {
    UINT32  Revision:8;
    UINT32  NumberOfTimers:5;
    UINT32  CounterSize:1;
    UINT32  Reserved0:1;
    UINT32  LegacyRoute:1;
    UINT32  VendorId:16;
    UINT32  CounterClockPeriod:32;
  } Bits;
  UINT64  Uint64;
} HPET_GENERAL_CAPABILITIES_ID_REGISTER;

///
/// HPET General Configuration Register
///
typedef union {
  struct {
    UINT32  MainCounterEnable:1;
    UINT32  LegacyRouteEnable:1;
    UINT32  Reserved0:30;
    UINT32  Reserved1:32;
  } Bits;
  UINT64  Uint64;
} HPET_GENERAL_CONFIGURATION_REGISTER;

///
/// HPET Timer Configuration Register
///
typedef union {
  struct {
    UINT32  Reserved0:1;
    UINT32  LevelTriggeredInterrupt:1;
    UINT32  InterruptEnable:1;
    UINT32  PeriodicInterruptEnable:1;
    UINT32  PeriodicInterruptCapablity:1;
    UINT32  CounterSizeCapablity:1;
    UINT32  ValueSetEnable:1;
    UINT32  Reserved1:1;
    UINT32  CounterSizeEnable:1;
    UINT32  InterruptRoute:5;
    UINT32  MsiInterruptEnable:1;
    UINT32  MsiInterruptCapablity:1;
    UINT32  Reserved2:16;
    UINT32  InterruptRouteCapability;
  } Bits;
  UINT64  Uint64;
} HPET_TIMER_CONFIGURATION_REGISTER;

///
/// HPET Timer MSI Route Register
///
typedef union {
  struct {
    UINT32  Value:32;
    UINT32  Address:32;
  } Bits;
  UINT64  Uint64;
} HPET_TIMER_MSI_ROUTE_REGISTER;

#pragma pack()

#endif