MdePkg/Include/IndustryStandard/HighPrecisionEventTimerTable.h

   1 /** @file
   2   ACPI high precision event timer table definition, defined at
   3   ftp://download.intel.com/labs/platcomp/hpet/download/hpetspec098a.pdf.
   4   Specification name is IA-PC HPET (High Precision Event Timers) Specification.
   5
   6   Copyright (c) 2007, Intel Corporation
   7   All rights reserved. This program and the accompanying materials
   8   are licensed and made available under the terms and conditions of the BSD License
   9   which accompanies this distribution.  The full text of the license may be found at
  10   http://opensource.org/licenses/bsd-license.php
  11
  12   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  13   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  14 **/
  15
  16 #ifndef _HIGH_PRECISION_EVENT_TIMER_TABLE_H_
  17 #define _HIGH_PRECISION_EVENT_TIMER_TABLE_H_
  18
  19 #include <IndustryStandard/Acpi.h>
  20
  21 //
  22 // Ensure proper structure formats
  23 //
  24 #pragma pack(1)
  25
  26 ///
  27 /// High Precision Event Timer Table header definition.
  28 ///
  29 typedef struct {
  30   EFI_ACPI_DESCRIPTION_HEADER             Header;
  31   UINT32                                  EventTimerBlockId;
  32   EFI_ACPI_2_0_GENERIC_ADDRESS_STRUCTURE  BaseAddressLower32Bit;
  33   UINT8                                   HpetNumber;
  34   UINT16                                  MainCounterMinimumClockTickInPeriodicMode;
  35   UINT8                                   PageProtectionAndOemAttribute;
  36 } EFI_ACPI_HIGH_PRECISION_EVENT_TIMER_TABLE_HEADER;
  37
  38 ///
  39 /// HPET Revision (defined in spec)
  40 ///
  41 #define EFI_ACPI_HIGH_PRECISION_EVENT_TIMER_TABLE_REVISION  0x01
  42
  43 //
  44 // Page protection setting
  45 // Values 3 through 15 are reserved for use by the specification
  46 //
  47 #define EFI_ACPI_NO_PAGE_PROTECTION   0
  48 #define EFI_ACPI_4KB_PAGE_PROTECTION  1
  49 #define EFI_ACPI_64KB_PAGE_PROTECTION 2
  50
  51 #pragma pack()
  52
  53 #endif