[edk2-platforms][PATCH V1 1/1] ArmPlatformPkg/PrePeiCore: Explicitly invoke constructor for SEC phase

[rohit.mathew@arm.com]

PrePeiCore's CEntry function calls DebugLib library's print API before
the library is initialized. So, invoke the constructor in the SEC phase
to call into initialization functions associated with libraries linked
with this particular module. This change is essential to initialize
uart for SEC.

Signed-off-by: Rohit Mathew <rohit.mathew@arm.com>
---
 ArmPlatformPkg/PrePeiCore/PrePeiCore.h | 11 ++++++++++-
 ArmPlatformPkg/PrePeiCore/PrePeiCore.c |  9 +++++++--
 2 files changed, 17 insertions(+), 3 deletions(-)

Link to github branch with the patches in this series -
https://github.com/rohit-arm/edk2/tree/sec_constructor_issue

diff --git a/ArmPlatformPkg/PrePeiCore/PrePeiCore.h b/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
index 0345dd7bdd2a..d2491aa586ee 100644
--- a/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
+++ b/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
@@ -1,7 +1,7 @@
 /** @file
   Main file supporting the transition to PEI Core in Normal World for Versatile Express
 
-  Copyright (c) 2011, ARM Limited. All rights reserved.
+  Copyright (c) 2011-2022, ARM Limited. All rights reserved.
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
@@ -73,4 +73,13 @@ PeiCommonExceptionEntry (
   IN UINTN   LR
   );
 
+/*
+ * Constructor for SEC phase
+ */
+VOID
+EFIAPI
+ProcessLibraryConstructorList (
+  VOID
+  );
+
 #endif
diff --git a/ArmPlatformPkg/PrePeiCore/PrePeiCore.c b/ArmPlatformPkg/PrePeiCore/PrePeiCore.c
index 6dd9bcdea24f..b5f7d2f05b1e 100644
--- a/ArmPlatformPkg/PrePeiCore/PrePeiCore.c
+++ b/ArmPlatformPkg/PrePeiCore/PrePeiCore.c
@@ -1,7 +1,7 @@
 /** @file
   Main file supporting the transition to PEI Core in Normal World for Versatile Express
 
-  Copyright (c) 2011-2014, ARM Limited. All rights reserved.
+  Copyright (c) 2011-2022, ARM Limited. All rights reserved.
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
@@ -86,7 +86,12 @@ CEntryPoint (
     ArmEnableVFP ();
   }
 
-  // Note: The MMU will be enabled by MemoryPeim. Only the primary core will have the MMU on.
+  // In the Sec phase, explicitly invoke the library constructors. This helps
+  // the DebugPrint library to be initialized before it is used by subsequent
+  // code executed in the sec phase.
+  ProcessLibraryConstructorList();
+
+  //Note: The MMU will be enabled by MemoryPeim. Only the primary core will have the MMU on.
 
   // If not primary Jump to Secondary Main
   if (ArmPlatformIsPrimaryCore (MpId)) {
-- 
2.25.1