ArmPlatformPkg: signal EndOfDxe event in PlatformBsdInit

Like the ArmVirtPkg platforms up until SVN r17713, the ArmPlatformPkg
platforms built with the Intel BDS fail to signal the end-of-DXE event
'gEfiEndOfDxeEventGroupGuid' when entering the BDS phase, which results
in some loss of functionality, i.e., variable reclaim in the VariableDxe
drivers, and the splitting of the memory regions that is part of the recently
added UEFI 2.5 properties table feature.

As discussed on the edk2-devel mailing list here:

http://thread.gmane.org/gmane.comp.bios.tianocore.devel/16088/focus=16109

it is up to the platform BDS to signal that event, since there may be
platform specific ordering constraints with respect to the signalling
of the event that are difficult to honor at the generic level.

So add the SignalEvent () call to PlatformBdsInit () of ArmPlatformPkg's
PlatformBdsLib implementation for the Intel BDS.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18394 6f19259b-4bc3-4df7-8a09-765794883524

ArmPlatformPkg/Library/PlatformIntelBdsLib/IntelBdsPlatform.c

@@ -31,6 +31,24 @@ PlatformIntelBdsConstructor (
   return EFI_SUCCESS;
 }
 
+/**
+  An empty function to pass error checking of CreateEventEx ().
+
+  @param  Event                 Event whose notification function is being invoked.
+  @param  Context               Pointer to the notification function's context,
+                                which is implementation-dependent.
+
+**/
+STATIC
+VOID
+EFIAPI
+EmptyCallbackFunction (
+  IN EFI_EVENT                Event,
+  IN VOID                     *Context
+  )
+{
+}
+
 //
 // BDS Platform Functions
 //
@@ -45,6 +63,24 @@ PlatformBdsInit (
   VOID
   )
 {
+  EFI_EVENT           EndOfDxeEvent;
+  EFI_STATUS          Status;
+
+  //
+  // Signal EndOfDxe PI Event
+  //
+  Status = gBS->CreateEventEx (
+                  EVT_NOTIFY_SIGNAL,
+                  TPL_CALLBACK,
+                  EmptyCallbackFunction,
+                  NULL,
+                  &gEfiEndOfDxeEventGroupGuid,
+                  &EndOfDxeEvent
+                  );
+  if (!EFI_ERROR (Status)) {
+    gBS->SignalEvent (EndOfDxeEvent);
+    gBS->CloseEvent (EndOfDxeEvent);
+  }
 }
 
 STATIC

ArmPlatformPkg/Library/PlatformIntelBdsLib/IntelBdsPlatform.h

@@ -30,5 +30,6 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 #include <Library/PlatformBdsLib.h>
 
 #include <Guid/GlobalVariable.h>
+#include <Guid/EventGroup.h>
 
 #endif // _INTEL_BDS_PLATFORM_H

ArmPlatformPkg/Library/PlatformIntelBdsLib/PlatformIntelBdsLib.inf

@@ -53,6 +53,7 @@
 
 [Guids]
   gArmGlobalVariableGuid
+  gEfiEndOfDxeEventGroupGuid
 
 [Pcd]
   gArmPlatformTokenSpaceGuid.PcdDefaultConInPaths