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   ArmPlatformPkg/ArmVirtualizationPkg/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) 2013-2014, ARM Ltd. All rights reserved.<BR>
  10   Copyright (c) 2014, Linaro Ltd. All rights reserved.<BR>
  11
  12   This program and the accompanying materials
  13   are licensed and made available under the terms and conditions of the BSD License
  14   which accompanies this distribution.  The full text of the license may be found at
  15   http://opensource.org/licenses/bsd-license.php
  16
  17   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  18   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  19
  20 **/
  21
  22 #include <PiDxe.h>
  23
  24 #include <Library/BaseLib.h>
  25 #include <Library/DebugLib.h>
  26 #include <Library/EfiResetSystemLib.h>
  27 #include <Library/ArmSmcLib.h>
  28
  29 #include <IndustryStandard/ArmStdSmc.h>
  30
  31 /**
  32   Resets the entire platform.
  33
  34   @param  ResetType             The type of reset to perform.
  35   @param  ResetStatus           The status code for the reset.
  36   @param  DataSize              The size, in bytes, of WatchdogData.
  37   @param  ResetData             For a ResetType of EfiResetCold, EfiResetWarm, or
  38                                 EfiResetShutdown the data buffer starts with a Null-terminated
  39                                 Unicode string, optionally followed by additional binary data.
  40
  41 **/
  42 EFI_STATUS
  43 EFIAPI
  44 LibResetSystem (
  45   IN EFI_RESET_TYPE   ResetType,
  46   IN EFI_STATUS       ResetStatus,
  47   IN UINTN            DataSize,
  48   IN CHAR16           *ResetData OPTIONAL
  49   )
  50 {
  51   ARM_SMC_ARGS ArmSmcArgs;
  52
  53   switch (ResetType) {
  54   case EfiResetPlatformSpecific:
  55     // Map the platform specific reset as reboot
  56   case EfiResetWarm:
  57     // Map a warm reset into a cold reset
  58   case EfiResetCold:
  59     // Send a PSCI 0.2 SYSTEM_RESET command
  60     ArmSmcArgs.Arg0 = ARM_SMC_ID_PSCI_SYSTEM_RESET;
  61     break;
  62   case EfiResetShutdown:
  63     // Send a PSCI 0.2 SYSTEM_OFF command
  64     ArmSmcArgs.Arg0 = ARM_SMC_ID_PSCI_SYSTEM_OFF;
  65     break;
  66   default:
  67     ASSERT (FALSE);
  68     return EFI_UNSUPPORTED;
  69   }
  70
  71   ArmCallSmc (&ArmSmcArgs);
  72
  73   // We should never be here
  74   DEBUG ((EFI_D_ERROR, "%a: PSCI Reset failed\n", __FUNCTION__));
  75   CpuDeadLoop ();
  76   return EFI_UNSUPPORTED;
  77 }
  78
  79 /**
  80   Initialize any infrastructure required for LibResetSystem () to function.
  81
  82   @param  ImageHandle   The firmware allocated handle for the EFI image.
  83   @param  SystemTable   A pointer to the EFI System Table.
  84
  85   @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.
  86
  87 **/
  88 EFI_STATUS
  89 EFIAPI
  90 LibInitializeResetSystem (
  91   IN EFI_HANDLE        ImageHandle,
  92   IN EFI_SYSTEM_TABLE  *SystemTable
  93   )
  94 {
  95   return EFI_SUCCESS;
  96 }