MdePkg/Include/IndustryStandard/HighPrecisionEventTimerTable.h

   1 /** @file
   2   ACPI high precision event timer table definition, at www.intel.com
   3   Specification name is IA-PC HPET (High Precision Event Timers) Specification.
   4
   5   Copyright (c) 2007 - 2008, Intel Corporation
   6   All rights reserved. This program and the accompanying materials
   7   are licensed and made available under the terms and conditions of the BSD License
   8   which accompanies this distribution.  The full text of the license may be found at
   9   http://opensource.org/licenses/bsd-license.php
  10
  11   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13 **/
  14
  15 #ifndef _HIGH_PRECISION_EVENT_TIMER_TABLE_H_
  16 #define _HIGH_PRECISION_EVENT_TIMER_TABLE_H_
  17
  18 #include <IndustryStandard/Acpi.h>
  19
  20 //
  21 // Ensure proper structure formats
  22 //
  23 #pragma pack(1)
  24
  25 ///
  26 /// High Precision Event Timer Table header definition.
  27 ///
  28 typedef struct {
  29   EFI_ACPI_DESCRIPTION_HEADER             Header;
  30   UINT32                                  EventTimerBlockId;
  31   EFI_ACPI_2_0_GENERIC_ADDRESS_STRUCTURE  BaseAddressLower32Bit;
  32   UINT8                                   HpetNumber;
  33   UINT16                                  MainCounterMinimumClockTickInPeriodicMode;
  34   UINT8                                   PageProtectionAndOemAttribute;
  35 } EFI_ACPI_HIGH_PRECISION_EVENT_TIMER_TABLE_HEADER;
  36
  37 ///
  38 /// HPET Revision (defined in spec)
  39 ///
  40 #define EFI_ACPI_HIGH_PRECISION_EVENT_TIMER_TABLE_REVISION  0x01
  41
  42 //
  43 // Page protection setting
  44 // Values 3 through 15 are reserved for use by the specification
  45 //
  46 #define EFI_ACPI_NO_PAGE_PROTECTION   0
  47 #define EFI_ACPI_4KB_PAGE_PROTECTION  1
  48 #define EFI_ACPI_64KB_PAGE_PROTECTION 2
  49
  50 #pragma pack()
  51
  52 #endif