ArmPkg/Library/ArmPsciResetSystemLib/ArmPsciResetSystemLib.c

   1 /** @file
   2   Support ResetSystem Runtime call using PSCI calls
   3
   4   Note: A similar library is implemented in
   5   ArmVirtPkg/Library/ArmVirtualizationPsciResetSystemLib
   6   So similar issues might exist in this implementation too.
   7
   8   Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
   9   Copyright (c) 2013-2015, ARM Ltd. All rights reserved.<BR>
  10   Copyright (c) 2014, Linaro Ltd. All rights reserved.<BR>
  11
  12   SPDX-License-Identifier: BSD-2-Clause-Patent
  13
  14 **/
  15
  16 #include <PiDxe.h>
  17
  18 #include <Library/BaseLib.h>
  19 #include <Library/DebugLib.h>
  20 #include <Library/EfiResetSystemLib.h>
  21 #include <Library/ArmSmcLib.h>
  22
  23 #include <IndustryStandard/ArmStdSmc.h>
  24
  25 /**
  26   Resets the entire platform.
  27
  28   @param  ResetType             The type of reset to perform.
  29   @param  ResetStatus           The status code for the reset.
  30   @param  DataSize              The size, in bytes, of WatchdogData.
  31   @param  ResetData             For a ResetType of EfiResetCold, EfiResetWarm, or
  32                                 EfiResetShutdown the data buffer starts with a Null-terminated
  33                                 Unicode string, optionally followed by additional binary data.
  34
  35 **/
  36 EFI_STATUS
  37 EFIAPI
  38 LibResetSystem (
  39   IN EFI_RESET_TYPE  ResetType,
  40   IN EFI_STATUS      ResetStatus,
  41   IN UINTN           DataSize,
  42   IN CHAR16          *ResetData OPTIONAL
  43   )
  44 {
  45   ARM_SMC_ARGS  ArmSmcArgs;
  46
  47   switch (ResetType) {
  48     case EfiResetPlatformSpecific:
  49     // Map the platform specific reset as reboot
  50     case EfiResetWarm:
  51     // Map a warm reset into a cold reset
  52     case EfiResetCold:
  53       // Send a PSCI 0.2 SYSTEM_RESET command
  54       ArmSmcArgs.Arg0 = ARM_SMC_ID_PSCI_SYSTEM_RESET;
  55       break;
  56     case EfiResetShutdown:
  57       // Send a PSCI 0.2 SYSTEM_OFF command
  58       ArmSmcArgs.Arg0 = ARM_SMC_ID_PSCI_SYSTEM_OFF;
  59       break;
  60     default:
  61       ASSERT (FALSE);
  62       return EFI_UNSUPPORTED;
  63   }
  64
  65   ArmCallSmc (&ArmSmcArgs);
  66
  67   // We should never be here
  68   DEBUG ((DEBUG_ERROR, "%a: PSCI Reset failed\n", __FUNCTION__));
  69   CpuDeadLoop ();
  70   return EFI_UNSUPPORTED;
  71 }
  72
  73 /**
  74   Initialize any infrastructure required for LibResetSystem () to function.
  75
  76   @param  ImageHandle   The firmware allocated handle for the EFI image.
  77   @param  SystemTable   A pointer to the EFI System Table.
  78
  79   @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.
  80
  81 **/
  82 EFI_STATUS
  83 EFIAPI
  84 LibInitializeResetSystem (
  85   IN EFI_HANDLE        ImageHandle,
  86   IN EFI_SYSTEM_TABLE  *SystemTable
  87   )
  88 {
  89   return EFI_SUCCESS;
  90 }