MdeModulePkg/BMUiLib: Check reset requirement before exiting UiApp

V2: Refine the comments.

In UI page, some configuration change may require system reset.
BootManagerUiLib misses this check before exiting UiApp to boot
other boot options. Now add the check.

Cc: Eric Dong <eric.dong@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Dandan Bi <dandan.bi@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

MdeModulePkg/Library/BootManagerUiLib/BootManager.c

@@ -1,7 +1,7 @@
 /** @file
   The boot manager reference implementation
 
-Copyright (c) 2004 - 2016, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2004 - 2017, Intel Corporation. All rights reserved.<BR>
 This program and the accompanying materials are licensed and made available under
 the terms and conditions of the BSD License that accompanies this distribution.
 The full text of the license may be found at
@@ -293,6 +293,50 @@ BmSetConsoleMode (
   return EFI_SUCCESS;
 }
 
+/**
+
+  Check whether a reset is needed,if reset is needed, Popup a menu to notice user.
+
+**/
+VOID
+BmSetupResetReminder (
+  VOID
+  )
+{
+  EFI_INPUT_KEY                 Key;
+  CHAR16                        *StringBuffer1;
+  CHAR16                        *StringBuffer2;
+  EFI_STATUS                    Status;
+  EDKII_FORM_BROWSER_EXTENSION2_PROTOCOL *FormBrowserEx2;
+
+  //
+  // Use BrowserEx2 protocol to check whether reset is required.
+  //
+  Status = gBS->LocateProtocol (&gEdkiiFormBrowserEx2ProtocolGuid, NULL, (VOID **) &FormBrowserEx2);
+  //
+  //check any reset required change is applied? if yes, reset system
+  //
+  if (!EFI_ERROR(Status) && FormBrowserEx2->IsResetRequired ()) {
+    StringBuffer1 = AllocateZeroPool (MAX_STRING_LEN * sizeof (CHAR16));
+    ASSERT (StringBuffer1 != NULL);
+    StringBuffer2 = AllocateZeroPool (MAX_STRING_LEN * sizeof (CHAR16));
+    ASSERT (StringBuffer2 != NULL);
+    StrCpyS (StringBuffer1, MAX_STRING_LEN, L"Configuration changed. Reset to apply it Now.");
+    StrCpyS (StringBuffer2, MAX_STRING_LEN, L"Press ENTER to reset");
+    //
+    // Popup a menu to notice user
+    //
+    do {
+      CreatePopUp (EFI_LIGHTGRAY | EFI_BACKGROUND_BLUE, &Key, StringBuffer1, StringBuffer2, NULL);
+    } while (Key.UnicodeChar != CHAR_CARRIAGE_RETURN);
+
+    FreePool (StringBuffer1);
+    FreePool (StringBuffer2);
+
+    gRT->ResetSystem (EfiResetCold, EFI_SUCCESS, 0, NULL);
+  }
+}
+
 /**
   Group the legacy boot options in the BootOption.
 
@@ -781,6 +825,11 @@ BootManagerCallback (
   gST->ConOut->SetAttribute (gST->ConOut, EFI_TEXT_ATTR (EFI_LIGHTGRAY, EFI_BLACK));
   gST->ConOut->ClearScreen (gST->ConOut);
 
+  //
+  //check any reset required change is applied? if yes, reset system
+  //
+  BmSetupResetReminder ();
+
   //
   // parse the selected option
   //

MdeModulePkg/Library/BootManagerUiLib/BootManager.h

@@ -1,7 +1,7 @@
 /** @file
   The boot manager reference implementation
 
-Copyright (c) 2004 - 2015, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2004 - 2017, Intel Corporation. All rights reserved.<BR>
 This program and the accompanying materials are licensed and made available under
 the terms and conditions of the BSD License that accompanies this distribution.
 The full text of the license may be found at
@@ -20,6 +20,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 
 #include <Protocol/HiiConfigAccess.h>
 #include <Protocol/DevicePathToText.h>
+#include <Protocol/FormBrowserEx2.h>
 
 #include <Library/PrintLib.h>
 #include <Library/DebugLib.h>
@@ -55,6 +56,7 @@ typedef struct {
 
 #define LABEL_BOOT_OPTION        0x00
 #define LABEL_BOOT_OPTION_END    0x01
+#define MAX_STRING_LEN           200
 
 //
 // Variable created with this flag will be "Efi:...."

MdeModulePkg/Library/BootManagerUiLib/BootManagerUiLib.inf

@@ -1,7 +1,7 @@
 ## @file
 #  Boot Manager Library used by UiApp.
 #
-#  Copyright (c) 2011 - 2015, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2011 - 2017, Intel Corporation. All rights reserved.<BR>
 #  This program and the accompanying materials are licensed and made available under
 #  the terms and conditions of the BSD License that accompanies this distribution.
 #  The full text of the license may be found at
@@ -56,6 +56,7 @@
 [Protocols]
   gEfiHiiConfigAccessProtocolGuid               ## CONSUMES
   gEfiDevicePathToTextProtocolGuid              ## CONSUMES
+  gEdkiiFormBrowserEx2ProtocolGuid              ## CONSUMES
 
 [FeaturePcd]