Vlv2DeviceRefCodePkg/AcpiTablesPCAT/Hpet/Hpet.aslc

   1 /*++
   2
   3 Copyright (c)  1999  - 2014, Intel Corporation. All rights reserved
   4
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7
   8
   9 Module Name:
  10
  11   Hpet.c
  12
  13 Abstract:
  14
  15   This file contains a structure definition for the ACPI HPET Table.
  16 --*/
  17
  18 //
  19 // Statements that include other files
  20 //
  21 #ifdef ECP_FLAG
  22 #include <Tiano.h>
  23 #endif
  24 #include <Hpet.h>
  25 #include "AcpiTablePlatform.h"
  26
  27 // Hpet Table
  28 EFI_ACPI_HIGH_PRECISION_EVENT_TIMER_TABLE_HEADER HPET = {
  29   {
  30     EFI_ACPI_3_0_HIGH_PRECISION_EVENT_TIMER_TABLE_SIGNATURE,
  31     sizeof (EFI_ACPI_HIGH_PRECISION_EVENT_TIMER_TABLE_HEADER),
  32     EFI_ACPI_HIGH_PRECISION_EVENT_TIMER_TABLE_REVISION,
  33     0,                          // to make sum of entire table == 0
  34     EFI_ACPI_OEM_ID,            // OEMID is a 6 bytes long field
  35     EFI_ACPI_OEM_TABLE_ID,      // OEM table identification(8 bytes long)
  36     EFI_ACPI_OEM_REVISION,      // OEM revision
  37     EFI_ACPI_CREATOR_ID,        // ASL compiler vendor ID
  38     EFI_ACPI_CREATOR_REVISION   // ASL compiler revision number
  39   },
  40   0x0,                          // EventTimerBlockId
  41   {
  42     0x00,                     // Address_Space_ID = System Memory
  43     0x40,                     // Register_Bit_Width = 32 bits, mentioned about write failures when in 64bit in SCU HAS
  44     0x00,                     // Register_Bit_offset
  45     0x00,                     // Dword access
  46     HPET_BASE_ADDRESS,        // Base addresse of HPET
  47   },
  48   0x0,                          // Only HPET's _UID in Namespace
  49   MAIN_COUNTER_MIN_PERIODIC_CLOCK_TICKS,
  50   0x0
  51 };
  52
  53 VOID*
  54 ReferenceAcpiTable (
  55   VOID
  56   )
  57 {
  58   //
  59   // Reference the table being generated to prevent the optimizer from
  60   // removing the data structure from the executable
  61   //
  62   return (VOID*)&HPET;
  63 }