OvmfPkg/Library/ResetSystemLib/BaseResetShutdown.c

   1 /** @file
   2   Base 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/PciLib.h>         // PciRead16()
  15 #include <Library/ResetSystemLib.h> // ResetShutdown()
  16 #include <OvmfPlatforms.h>          // OVMF_HOSTBRIDGE_DID
  17
  18 /**
  19   Calling this function causes the system to enter a power state equivalent
  20   to the ACPI G2/S5 or G3 states.
  21
  22   System shutdown should not return, if it returns, it means the system does
  23   not support shut down reset.
  24 **/
  25 VOID
  26 EFIAPI
  27 ResetShutdown (
  28   VOID
  29   )
  30 {
  31   UINT16 AcpiPmBaseAddress;
  32   UINT16 HostBridgeDevId;
  33
  34   AcpiPmBaseAddress = 0;
  35   HostBridgeDevId = PciRead16 (OVMF_HOSTBRIDGE_DID);
  36   switch (HostBridgeDevId) {
  37   case INTEL_82441_DEVICE_ID:
  38     AcpiPmBaseAddress = PIIX4_PMBA_VALUE;
  39     break;
  40   case INTEL_Q35_MCH_DEVICE_ID:
  41     AcpiPmBaseAddress = ICH9_PMBASE_VALUE;
  42     break;
  43   default:
  44     ASSERT (FALSE);
  45     CpuDeadLoop ();
  46   }
  47
  48   IoBitFieldWrite16 (AcpiPmBaseAddress + 4, 10, 13, 0);
  49   IoOr16 (AcpiPmBaseAddress + 4, BIT13);
  50   CpuDeadLoop ();
  51 }