OvmfPkg/Library/ResetSystemLib/DxeResetShutdown.c

   1 /** @file
   2   DXE Reset System Library Shutdown API implementation for OVMF.
   3
   4   Copyright (C) 2020, Red Hat, Inc.
   5   Copyright (c) 2006 - 2019, Intel Corporation. All rights reserved.<BR>
   6   SPDX-License-Identifier: BSD-2-Clause-Patent
   7 **/
   8
   9 #include <Base.h>                   // BIT13
  10
  11 #include <Library/BaseLib.h>        // CpuDeadLoop()
  12 #include <Library/DebugLib.h>       // ASSERT()
  13 #include <Library/IoLib.h>          // IoOr16()
  14 #include <Library/PcdLib.h>         // PcdGet16()
  15 #include <Library/ResetSystemLib.h> // ResetShutdown()
  16 #include <OvmfPlatforms.h>          // PIIX4_PMBA_VALUE
  17
  18 STATIC UINT16  mAcpiPmBaseAddress;
  19
  20 EFI_STATUS
  21 EFIAPI
  22 DxeResetInit (
  23   IN EFI_HANDLE        ImageHandle,
  24   IN EFI_SYSTEM_TABLE  *SystemTable
  25   )
  26 {
  27   UINT16  HostBridgeDevId;
  28
  29   HostBridgeDevId = PcdGet16 (PcdOvmfHostBridgePciDevId);
  30   switch (HostBridgeDevId) {
  31     case INTEL_82441_DEVICE_ID:
  32       mAcpiPmBaseAddress = PIIX4_PMBA_VALUE;
  33       break;
  34     case INTEL_Q35_MCH_DEVICE_ID:
  35       mAcpiPmBaseAddress = ICH9_PMBASE_VALUE;
  36       break;
  37     default:
  38       ASSERT (FALSE);
  39       CpuDeadLoop ();
  40       return EFI_UNSUPPORTED;
  41   }
  42
  43   return EFI_SUCCESS;
  44 }
  45
  46 /**
  47   Calling this function causes the system to enter a power state equivalent
  48   to the ACPI G2/S5 or G3 states.
  49
  50   System shutdown should not return, if it returns, it means the system does
  51   not support shut down reset.
  52 **/
  53 VOID
  54 EFIAPI
  55 ResetShutdown (
  56   VOID
  57   )
  58 {
  59   IoBitFieldWrite16 (mAcpiPmBaseAddress + 4, 10, 13, 0);
  60   IoOr16 (mAcpiPmBaseAddress + 4, BIT13);
  61   CpuDeadLoop ();
  62 }