MdePkg/Library/UefiRuntimeLib/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 EFI_EVENT              mEfiExitBootServicesEvent;
  23 STATIC BOOLEAN                mEfiGoneVirtual         = FALSE;
  24 STATIC BOOLEAN                mEfiAtRuntime           = FALSE;
  25 EFI_RUNTIME_SERVICES          *mRT;
  26
  27 /**
  28   Set AtRuntime flag as TRUE after ExitBootServices
  29
  30   @param[in]  Event   The Event that is being processed
  31   @param[in]  Context Event Context
  32 **/
  33 VOID
  34 EFIAPI
  35 RuntimeLibExitBootServicesEvent (
  36   IN EFI_EVENT        Event,
  37   IN VOID             *Context
  38   )
  39 {
  40   //
  41   // Clear out BootService globals
  42   //
  43   gBS             = NULL;
  44
  45   mEfiAtRuntime = TRUE;
  46 }
  47
  48 /**
  49   Fixup internal data so that EFI can be call in virtual mode.
  50   Call the passed in Child Notify event and convert any pointers in
  51   lib to virtual mode.
  52
  53   @param[in]    Event   The Event that is being processed
  54   @param[in]    Context Event Context
  55 **/
  56 VOID
  57 EFIAPI
  58 RuntimeLibVirtualNotifyEvent (
  59   IN EFI_EVENT        Event,
  60   IN VOID             *Context
  61   )
  62 {
  63   //
  64   // Update global for Runtime Services Table and IO
  65   //
  66   EfiConvertPointer (0, (VOID **) &mRT);
  67
  68   mEfiGoneVirtual = TRUE;
  69 }
  70
  71 /**
  72   Intialize runtime Driver Lib if it has not yet been initialized.
  73
  74   @param[in]  ImageHandle   The firmware allocated handle for the EFI image.
  75   @param[in]  SystemTable   A pointer to the EFI System Table.
  76
  77   @return     EFI_STATUS    always returns EFI_SUCCESS except EFI_ALREADY_STARTED if already started.
  78 **/
  79 EFI_STATUS
  80 EFIAPI
  81 RuntimeDriverLibConstruct (
  82   IN EFI_HANDLE           ImageHandle,
  83   IN EFI_SYSTEM_TABLE     *SystemTable
  84   )
  85 {
  86   EFI_STATUS  Status;
  87
  88   mRT = gRT;
  89   ASSERT (mRT != NULL);
  90
  91   //
  92   // Register SetVirtualAddressMap () notify function
  93   //
  94   ASSERT (gBS != NULL);
  95   Status = gBS->CreateEvent (
  96                   EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE,
  97                   TPL_NOTIFY,
  98                   RuntimeLibVirtualNotifyEvent,
  99                   NULL,
 100                   &mEfiVirtualNotifyEvent
 101                   );
 102
 103   ASSERT_EFI_ERROR (Status);
 104
 105   Status = gBS->CreateEvent (
 106                   EVT_SIGNAL_EXIT_BOOT_SERVICES,
 107                   TPL_NOTIFY,
 108                   RuntimeLibExitBootServicesEvent,
 109                   NULL,
 110                   &mEfiExitBootServicesEvent
 111                   );
 112
 113   ASSERT_EFI_ERROR (Status);
 114
 115   return Status;
 116 }
 117
 118 /**
 119   This routine will free some resources which have been allocated in
 120   EfiInitializeRuntimeDriverLib(). If a runtime driver exits with an error,
 121   it must call this routine to free the allocated resource before the exiting.
 122
 123   @retval     EFI_SUCCESS       Shutdown the Runtime Driver Lib successfully
 124   @retval     EFI_UNSUPPORTED   Runtime Driver lib was not initialized at all
 125 **/
 126 EFI_STATUS
 127 EFIAPI
 128 RuntimeDriverLibDeconstruct (
 129   IN EFI_HANDLE        ImageHandle,
 130   IN EFI_SYSTEM_TABLE  *SystemTable
 131   )
 132 {
 133   EFI_STATUS  Status;
 134
 135   //
 136   // Close SetVirtualAddressMap () notify function
 137   //
 138   ASSERT (gBS != NULL);
 139   Status = gBS->CloseEvent (mEfiVirtualNotifyEvent);
 140   ASSERT_EFI_ERROR (Status);
 141
 142   Status = gBS->CloseEvent (mEfiExitBootServicesEvent);
 143   ASSERT_EFI_ERROR (Status);
 144
 145   return Status;
 146 }
 147
 148 /**
 149   Return TRUE if ExitBootServices () has been called
 150
 151   @retval TRUE If ExitBootServices () has been called
 152 **/
 153 BOOLEAN
 154 EFIAPI
 155 EfiAtRuntime (
 156   VOID
 157   )
 158 {
 159   return mEfiAtRuntime;
 160 }
 161
 162 /**
 163   Return TRUE if SetVirtualAddressMap () has been called
 164
 165   @retval TRUE  If SetVirtualAddressMap () has been called
 166 **/
 167 BOOLEAN
 168 EFIAPI
 169 EfiGoneVirtual (
 170   VOID
 171   )
 172 {
 173   return mEfiGoneVirtual;
 174 }
 175