EdkModulePkg/Library/EdkUefiRuntimeLib/Common/RuntimeLib.c

   1 /**@file
   2   Library utility functions for Runtime driver.
   3
   4 Copyright (c) 2006 Intel Corporation. <BR>
   5 All rights reserved. This program and the accompanying materials
   6 are licensed and made available under the terms and conditions of the BSD License
   7 which accompanies this distribution.  The full text of the license may be found at
   8 http://opensource.org/licenses/bsd-license.php
   9
  10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include <RuntimeLibInternal.h>
  16
  17 ///
  18 /// Driver Lib Module Globals
  19 ///
  20
  21 STATIC EFI_EVENT              mEfiVirtualNotifyEvent;
  22 STATIC BOOLEAN                mEfiGoneVirtual         = FALSE;
  23 STATIC BOOLEAN                mEfiAtRuntime           = FALSE;
  24 EFI_RUNTIME_SERVICES          *mRT;
  25
  26 /**
  27   Set AtRuntime flag as TRUE after ExitBootServices
  28
  29   @param[in]  Event   The Event that is being processed
  30   @param[in]  Context Event Context
  31 **/
  32 VOID
  33 EFIAPI
  34 RuntimeDriverExitBootServices (
  35   IN EFI_EVENT        Event,
  36   IN VOID             *Context
  37   )
  38 {
  39   //
  40   // Clear out BootService globals
  41   //
  42   gBS             = NULL;
  43
  44   mEfiAtRuntime = TRUE;
  45 }
  46
  47 /**
  48   Fixup internal data so that EFI can be call in virtual mode.
  49   Call the passed in Child Notify event and convert any pointers in
  50   lib to virtual mode.
  51
  52   @param[in]    Event   The Event that is being processed
  53   @param[in]    Context Event Context
  54 **/
  55 STATIC
  56 VOID
  57 EFIAPI
  58 RuntimeLibVirtualNotifyEvent (
  59   IN EFI_EVENT        Event,
  60   IN VOID             *Context
  61   )
  62 {
  63   UINTN Index;
  64   EFI_EVENT_NOTIFY  ChildNotifyEventHandler;
  65
  66   for (Index = 0;
  67        _gDriverSetVirtualAddressMapEvent[Index] != NULL;
  68        Index++) {
  69     ChildNotifyEventHandler = _gDriverSetVirtualAddressMapEvent[Index];
  70     ChildNotifyEventHandler (Event, NULL);
  71   }
  72
  73   //
  74   // Update global for Runtime Services Table and IO
  75   //
  76   EfiConvertPointer (0, (VOID **) &mRT);
  77
  78   mEfiGoneVirtual = TRUE;
  79 }
  80
  81 /**
  82   Intialize runtime Driver Lib if it has not yet been initialized.
  83
  84   @param[in]  ImageHandle   The firmware allocated handle for the EFI image.
  85   @param[in]  SystemTable   A pointer to the EFI System Table.
  86
  87   @return     EFI_STATUS    always returns EFI_SUCCESS except EFI_ALREADY_STARTED if already started.
  88 **/
  89 EFI_STATUS
  90 EFIAPI
  91 RuntimeDriverLibConstruct (
  92   IN EFI_HANDLE           ImageHandle,
  93   IN EFI_SYSTEM_TABLE     *SystemTable
  94   )
  95 {
  96   EFI_STATUS  Status;
  97
  98   ASSERT (SystemTable != NULL);
  99   mRT = SystemTable->RuntimeServices;
 100   ASSERT (mRT != NULL);
 101
 102   //
 103   // Register SetVirtualAddressMap () notify function
 104   //
 105   ASSERT (gBS != NULL);
 106   Status = gBS->CreateEvent (
 107                   EFI_EVENT_SIGNAL_VIRTUAL_ADDRESS_CHANGE,
 108                   EFI_TPL_NOTIFY,
 109                   RuntimeLibVirtualNotifyEvent,
 110                   NULL,
 111                   &mEfiVirtualNotifyEvent
 112                   );
 113
 114   ASSERT_EFI_ERROR (Status);
 115
 116   return Status;
 117 }
 118
 119 /**
 120   This routine will free some resources which have been allocated in
 121   EfiInitializeRuntimeDriverLib(). If a runtime driver exits with an error,
 122   it must call this routine to free the allocated resource before the exiting.
 123
 124   @retval     EFI_SUCCESS       Shutdown the Runtime Driver Lib successfully
 125   @retval     EFI_UNSUPPORTED   Runtime Driver lib was not initialized at all
 126 **/
 127 EFI_STATUS
 128 EFIAPI
 129 RuntimeDriverLibDeconstruct (
 130   IN EFI_HANDLE        ImageHandle,
 131   IN EFI_SYSTEM_TABLE  *SystemTable
 132   )
 133 {
 134   EFI_STATUS  Status;
 135
 136   //
 137   // Close SetVirtualAddressMap () notify function
 138   //
 139   ASSERT (gBS != NULL);
 140   Status = gBS->CloseEvent (mEfiVirtualNotifyEvent);
 141   ASSERT_EFI_ERROR (Status);
 142
 143   return Status;
 144 }
 145
 146 /**
 147   Return TRUE if ExitBootServices () has been called
 148
 149   @retval TRUE If ExitBootServices () has been called
 150 **/
 151 BOOLEAN
 152 EFIAPI
 153 EfiAtRuntime (
 154   VOID
 155   )
 156 {
 157   return mEfiAtRuntime;
 158 }
 159
 160 /**
 161   Return TRUE if SetVirtualAddressMap () has been called
 162
 163   @retval TRUE  If SetVirtualAddressMap () has been called
 164 **/
 165 BOOLEAN
 166 EFIAPI
 167 EfiGoneVirtual (
 168   VOID
 169   )
 170 {
 171   return mEfiGoneVirtual;
 172 }
 173