MdeModulePkg/Universal/ResetSystemRuntimeDxe/ResetSystem.c

   1 /** @file
   2   Reset Architectural and Reset Notification protocols implementation.
   3
   4   Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
   5
   6   This program and the accompanying materials
   7   are licensed and made available under the terms and conditions of the BSD License
   8   which accompanies this distribution.  The full text of the license may be found at
   9   http://opensource.org/licenses/bsd-license.php
  10
  11   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13
  14 **/
  15
  16 #include "ResetSystem.h"
  17
  18 GLOBAL_REMOVE_IF_UNREFERENCED CHAR16 *mResetTypeStr[] = {
  19   L"Cold", L"Warm", L"Shutdown", L"PlatformSpecific"
  20 };
  21
  22 //
  23 // The current ResetSystem() notification recursion depth
  24 //
  25 UINTN  mResetNotifyDepth = 0;
  26
  27 /**
  28   Register a notification function to be called when ResetSystem() is called.
  29
  30   The RegisterResetNotify() function registers a notification function that is called when
  31   ResetSystem()is called and prior to completing the reset of the platform.
  32   The registered functions must not perform a platform reset themselves. These
  33   notifications are intended only for the notification of components which may need some
  34   special-purpose maintenance prior to the platform resetting.
  35   The list of registered reset notification functions are processed if ResetSystem()is called
  36   before ExitBootServices(). The list of registered reset notification functions is ignored if
  37   ResetSystem()is called after ExitBootServices().
  38
  39   @param[in]  This              A pointer to the EFI_RESET_NOTIFICATION_PROTOCOL instance.
  40   @param[in]  ResetFunction     Points to the function to be called when a ResetSystem() is executed.
  41
  42   @retval EFI_SUCCESS           The reset notification function was successfully registered.
  43   @retval EFI_INVALID_PARAMETER ResetFunction is NULL.
  44   @retval EFI_OUT_OF_RESOURCES  There are not enough resources available to register the reset notification function.
  45   @retval EFI_ALREADY_STARTED   The reset notification function specified by ResetFunction has already been registered.
  46
  47 **/
  48 EFI_STATUS
  49 EFIAPI
  50 RegisterResetNotify (
  51   IN EFI_RESET_NOTIFICATION_PROTOCOL *This,
  52   IN EFI_RESET_SYSTEM                ResetFunction
  53   )
  54 {
  55   RESET_NOTIFICATION_INSTANCE        *Instance;
  56   LIST_ENTRY                         *Link;
  57   RESET_NOTIFY_ENTRY                 *Entry;
  58
  59   if (ResetFunction == NULL) {
  60     return EFI_INVALID_PARAMETER;
  61   }
  62
  63   Instance = RESET_NOTIFICATION_INSTANCE_FROM_THIS (This);
  64
  65   for ( Link = GetFirstNode (&Instance->ResetNotifies)
  66       ; !IsNull (&Instance->ResetNotifies, Link)
  67       ; Link = GetNextNode (&Instance->ResetNotifies, Link)
  68       ) {
  69     Entry = RESET_NOTIFY_ENTRY_FROM_LINK (Link);
  70     if (Entry->ResetNotify == ResetFunction) {
  71       return EFI_ALREADY_STARTED;
  72     }
  73   }
  74
  75   ASSERT (IsNull (&Instance->ResetNotifies, Link));
  76   Entry = AllocatePool (sizeof (*Entry));
  77   if (Entry == NULL) {
  78     return EFI_OUT_OF_RESOURCES;
  79   }
  80   Entry->Signature   = RESET_NOTIFY_ENTRY_SIGNATURE;
  81   Entry->ResetNotify = ResetFunction;
  82   InsertTailList (&Instance->ResetNotifies, &Entry->Link);
  83   return EFI_SUCCESS;
  84 }
  85
  86 /**
  87   Unregister a notification function.
  88
  89   The UnregisterResetNotify() function removes the previously registered
  90   notification using RegisterResetNotify().
  91
  92   @param[in]  This              A pointer to the EFI_RESET_NOTIFICATION_PROTOCOL instance.
  93   @param[in]  ResetFunction     The pointer to the ResetFunction being unregistered.
  94
  95   @retval EFI_SUCCESS           The reset notification function was unregistered.
  96   @retval EFI_INVALID_PARAMETER ResetFunction is NULL.
  97   @retval EFI_INVALID_PARAMETER The reset notification function specified by ResetFunction was not previously
  98                                 registered using RegisterResetNotify().
  99
 100 **/
 101 EFI_STATUS
 102 EFIAPI
 103 UnregisterResetNotify (
 104   IN EFI_RESET_NOTIFICATION_PROTOCOL *This,
 105   IN EFI_RESET_SYSTEM                ResetFunction
 106   )
 107 {
 108   RESET_NOTIFICATION_INSTANCE        *Instance;
 109   LIST_ENTRY                         *Link;
 110   RESET_NOTIFY_ENTRY                 *Entry;
 111
 112   if (ResetFunction == NULL) {
 113     return EFI_INVALID_PARAMETER;
 114   }
 115
 116   Instance = RESET_NOTIFICATION_INSTANCE_FROM_THIS (This);
 117
 118   for ( Link = GetFirstNode (&Instance->ResetNotifies)
 119       ; !IsNull (&Instance->ResetNotifies, Link)
 120       ; Link = GetNextNode (&Instance->ResetNotifies, Link)
 121       ) {
 122     Entry = RESET_NOTIFY_ENTRY_FROM_LINK (Link);
 123     if (Entry->ResetNotify == ResetFunction) {
 124       RemoveEntryList (&Entry->Link);
 125       FreePool (Entry);
 126       return EFI_SUCCESS;
 127     }
 128   }
 129
 130   return EFI_INVALID_PARAMETER;
 131 }
 132
 133 RESET_NOTIFICATION_INSTANCE mResetNotification = {
 134   RESET_NOTIFICATION_INSTANCE_SIGNATURE,
 135   {
 136     RegisterResetNotify,
 137     UnregisterResetNotify
 138   },
 139   INITIALIZE_LIST_HEAD_VARIABLE (mResetNotification.ResetNotifies)
 140 };
 141
 142 RESET_NOTIFICATION_INSTANCE mPlatformSpecificResetFilter = {
 143   RESET_NOTIFICATION_INSTANCE_SIGNATURE,
 144   {
 145     RegisterResetNotify,
 146     UnregisterResetNotify
 147   },
 148   INITIALIZE_LIST_HEAD_VARIABLE (mPlatformSpecificResetFilter.ResetNotifies)
 149 };
 150
 151 RESET_NOTIFICATION_INSTANCE mPlatformSpecificResetHandler = {
 152   RESET_NOTIFICATION_INSTANCE_SIGNATURE,
 153   {
 154     RegisterResetNotify,
 155     UnregisterResetNotify
 156   },
 157   INITIALIZE_LIST_HEAD_VARIABLE (mPlatformSpecificResetHandler.ResetNotifies)
 158 };
 159
 160 /**
 161   The driver's entry point.
 162
 163   It initializes the Reset Architectural Protocol.
 164
 165   @param[in] ImageHandle  The firmware allocated handle for the EFI image.
 166   @param[in] SystemTable  A pointer to the EFI System Table.
 167
 168   @retval EFI_SUCCESS     The entry point is executed successfully.
 169   @retval other           Cannot install ResetArch protocol.
 170
 171 **/
 172 EFI_STATUS
 173 EFIAPI
 174 InitializeResetSystem (
 175   IN EFI_HANDLE        ImageHandle,
 176   IN EFI_SYSTEM_TABLE  *SystemTable
 177   )
 178 {
 179   EFI_STATUS  Status;
 180   EFI_HANDLE  Handle;
 181
 182   //
 183   // Make sure the Reset Architectural Protocol is not already installed in the system
 184   //
 185   ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gEfiResetArchProtocolGuid);
 186
 187   //
 188   // Hook the runtime service table
 189   //
 190   gRT->ResetSystem = ResetSystem;
 191
 192   //
 193   // Now install the Reset RT AP on a new handle
 194   //
 195   Handle = NULL;
 196   Status = gBS->InstallMultipleProtocolInterfaces (
 197                   &Handle,
 198                   &gEfiResetArchProtocolGuid,         NULL,
 199                   &gEfiResetNotificationProtocolGuid, &mResetNotification.ResetNotification,
 200                   &gEdkiiPlatformSpecificResetFilterProtocolGuid, &mPlatformSpecificResetFilter.ResetNotification,
 201                   &gEdkiiPlatformSpecificResetHandlerProtocolGuid, &mPlatformSpecificResetHandler.ResetNotification,
 202                   NULL
 203                   );
 204   ASSERT_EFI_ERROR (Status);
 205
 206   return Status;
 207 }
 208
 209 /**
 210   Put the system into S3 power state.
 211 **/
 212 VOID
 213 DoS3 (
 214   VOID
 215   )
 216 {
 217   EnterS3WithImmediateWake ();
 218
 219   //
 220   // Should not return
 221   //
 222   CpuDeadLoop ();
 223 }
 224
 225 /**
 226   Resets the entire platform.
 227
 228   @param[in] ResetType          The type of reset to perform.
 229   @param[in] ResetStatus        The status code for the reset.
 230   @param[in] DataSize           The size, in bytes, of ResetData.
 231   @param[in] ResetData          For a ResetType of EfiResetCold, EfiResetWarm, or
 232                                 EfiResetShutdown the data buffer starts with a Null-terminated
 233                                 string, optionally followed by additional binary data.
 234                                 The string is a description that the caller may use to further
 235                                 indicate the reason for the system reset. ResetData is only
 236                                 valid if ResetStatus is something other than EFI_SUCCESS
 237                                 unless the ResetType is EfiResetPlatformSpecific
 238                                 where a minimum amount of ResetData is always required.
 239                                 For a ResetType of EfiResetPlatformSpecific the data buffer
 240                                 also starts with a Null-terminated string that is followed
 241                                 by an EFI_GUID that describes the specific type of reset to perform.
 242 **/
 243 VOID
 244 EFIAPI
 245 ResetSystem (
 246   IN EFI_RESET_TYPE   ResetType,
 247   IN EFI_STATUS       ResetStatus,
 248   IN UINTN            DataSize,
 249   IN VOID             *ResetData OPTIONAL
 250   )
 251 {
 252   EFI_STATUS          Status;
 253   UINTN               Size;
 254   UINTN               CapsuleDataPtr;
 255   LIST_ENTRY          *Link;
 256   RESET_NOTIFY_ENTRY  *Entry;
 257
 258   //
 259   // Only do REPORT_STATUS_CODE() on first call to ResetSystem()
 260   //
 261   if (mResetNotifyDepth == 0) {
 262     //
 263     // Indicate reset system runtime service is called.
 264     //
 265     REPORT_STATUS_CODE (EFI_PROGRESS_CODE, (EFI_SOFTWARE_EFI_RUNTIME_SERVICE | EFI_SW_RS_PC_RESET_SYSTEM));
 266   }
 267
 268   mResetNotifyDepth++;
 269   DEBUG ((DEBUG_INFO, "DXE ResetSystem2: Reset call depth = %d.\n", mResetNotifyDepth));
 270
 271   if (mResetNotifyDepth <= MAX_RESET_NOTIFY_DEPTH) {
 272     if (!EfiAtRuntime ()) {
 273       //
 274       // Call reset notification functions registered through the
 275       // EDKII_PLATFORM_SPECIFIC_RESET_FILTER_PROTOCOL.
 276       //
 277       for ( Link = GetFirstNode (&mPlatformSpecificResetFilter.ResetNotifies)
 278           ; !IsNull (&mPlatformSpecificResetFilter.ResetNotifies, Link)
 279           ; Link = GetNextNode (&mPlatformSpecificResetFilter.ResetNotifies, Link)
 280           ) {
 281         Entry = RESET_NOTIFY_ENTRY_FROM_LINK (Link);
 282         Entry->ResetNotify (ResetType, ResetStatus, DataSize, ResetData);
 283       }
 284       //
 285       // Call reset notification functions registered through the
 286       // EFI_RESET_NOTIFICATION_PROTOCOL.
 287       //
 288       for ( Link = GetFirstNode (&mResetNotification.ResetNotifies)
 289           ; !IsNull (&mResetNotification.ResetNotifies, Link)
 290           ; Link = GetNextNode (&mResetNotification.ResetNotifies, Link)
 291           ) {
 292         Entry = RESET_NOTIFY_ENTRY_FROM_LINK (Link);
 293         Entry->ResetNotify (ResetType, ResetStatus, DataSize, ResetData);
 294       }
 295       //
 296       // call reset notification functions registered through the
 297       // EDKII_PLATFORM_SPECIFIC_RESET_HANDLER_PROTOCOL.
 298       //
 299       for ( Link = GetFirstNode (&mPlatformSpecificResetHandler.ResetNotifies)
 300           ; !IsNull (&mPlatformSpecificResetHandler.ResetNotifies, Link)
 301           ; Link = GetNextNode (&mPlatformSpecificResetHandler.ResetNotifies, Link)
 302           ) {
 303         Entry = RESET_NOTIFY_ENTRY_FROM_LINK (Link);
 304         Entry->ResetNotify (ResetType, ResetStatus, DataSize, ResetData);
 305       }
 306     }
 307   } else {
 308     ASSERT (ResetType < ARRAY_SIZE (mResetTypeStr));
 309     DEBUG ((DEBUG_ERROR, "DXE ResetSystem2: Maximum reset call depth is met. Use the current reset type: %s!\n", mResetTypeStr[ResetType]));
 310   }
 311
 312   switch (ResetType) {
 313   case EfiResetWarm:
 314
 315     //
 316     //Check if there are pending capsules to process
 317     //
 318     Size = sizeof (CapsuleDataPtr);
 319     Status =  EfiGetVariable (
 320                  EFI_CAPSULE_VARIABLE_NAME,
 321                  &gEfiCapsuleVendorGuid,
 322                  NULL,
 323                  &Size,
 324                  (VOID *) &CapsuleDataPtr
 325                  );
 326
 327     if (Status == EFI_SUCCESS) {
 328       //
 329       //Process capsules across a system reset.
 330       //
 331       DoS3();
 332     }
 333
 334     ResetWarm ();
 335     break;
 336
 337  case EfiResetCold:
 338     ResetCold ();
 339     break;
 340
 341   case EfiResetShutdown:
 342     ResetShutdown ();
 343     return ;
 344
 345   case EfiResetPlatformSpecific:
 346     ResetPlatformSpecific (DataSize, ResetData);
 347     return;
 348
 349   default:
 350     return ;
 351   }
 352
 353   //
 354   // Given we should have reset getting here would be bad
 355   //
 356   ASSERT (FALSE);
 357 }