From 2963ff004a52543e54098d6eded5780db8ef6dbe Mon Sep 17 00:00:00 2001
From: Laszlo Ersek <lersek@redhat.com>
Date: Wed, 14 Oct 2015 13:59:20 +0200
Subject: ArmPlatformPkg: PrePeiCore: write early hello message to the serial
 port (RH)

Notes about the RHEL-8.3/20200603-ca407c7246bf [edk2-stable202005] ->
RHEL-8.5/20210520-e1999b264f1f [edk2-stable202105] rebase:

- no change

Notes about the RHEL-8.2/20190904-37eef91017ad [edk2-stable201908] ->
RHEL-8.3/20200603-ca407c7246bf [edk2-stable202005] rebase:

- no change

Notes about the RHEL-8.1/20190308-89910a39dcfd [edk2-stable201903] ->
RHEL-8.2/20190904-37eef91017ad [edk2-stable201908] rebase:

- no change

Notes about the RHEL-8.0/20180508-ee3198e672e2 ->
RHEL-8.1/20190308-89910a39dcfd rebase:

- no change

Notes about the RHEL-7.6/ovmf-20180508-2.gitee3198e672e2.el7 ->
RHEL-8.0/20180508-ee3198e672e2 rebase:

- reorder the rebase changelog in the commit message so that it reads like
  a blog: place more recent entries near the top
- no changes to the patch body

Notes about the 20171011-92d07e48907f -> 20180508-ee3198e672e2 rebase:

- adapt to upstream commit 7e2a8dfe8a9a ("ArmPlatformPkg/PrePeiCore: seed
  temporary stack before entering PEI core", 2017-11-09) -- conflict
  resolution in "ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf"

Notes about the 20170228-c325e41585e3 -> 20171011-92d07e48907f rebase:

- no changes

Notes about the 20160608b-988715a -> 20170228-c325e41585e3 rebase:

- no changes

The FixedPcdGetSize() macro expands to an integer constant, therefore an
optimizing compiler can eliminate the new code, if the platform DSC
doesn't override the empty string (size=1) default of
PcdEarlyHelloMessage.

RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=1270279
Downstream only:
<http://thread.gmane.org/gmane.comp.bios.edk2.devel/2996/focus=3433>.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
(cherry picked from commit b16c4c505ce0e27305235533eac9236aa66f132e)
(cherry picked from commit 742e5bf6d5ce5a1e73879d6e5c0dd00feda7a9ac)
(cherry picked from commit 93d69eb9393cf05af90676253875c59c1bec67fd)
(cherry picked from commit 638594083b191f84f5d9333eb6147a31570f5a5a)
(cherry picked from commit f4b7aae411d88b2b83f85d20ef06a4032a57e7de)
(cherry picked from commit bb71490fdda3b38fa9f071d281b863f9b64363bf)
(cherry picked from commit 8d5a8827aabc67cb2a046697e1a750ca8d9cc453)
(cherry picked from commit 49fe5596cd79c94d903c4d506c563d642ccd69aa)
---
 ArmPlatformPkg/PrePeiCore/MainMPCore.c          | 5 +++++
 ArmPlatformPkg/PrePeiCore/MainUniCore.c         | 5 +++++
 ArmPlatformPkg/PrePeiCore/PrePeiCore.h          | 1 +
 ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf  | 2 ++
 ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf | 2 ++
 5 files changed, 15 insertions(+)

diff --git a/ArmPlatformPkg/PrePeiCore/MainMPCore.c b/ArmPlatformPkg/PrePeiCore/MainMPCore.c
index b5d0d3a644..5126a6dfb0 100644
--- a/ArmPlatformPkg/PrePeiCore/MainMPCore.c
+++ b/ArmPlatformPkg/PrePeiCore/MainMPCore.c
@@ -116,6 +116,11 @@ PrimaryMain (
   UINTN                   TemporaryRamBase;
   UINTN                   TemporaryRamSize;
 
+  if (FixedPcdGetSize (PcdEarlyHelloMessage) > 1) {
+    SerialPortWrite (FixedPcdGetPtr (PcdEarlyHelloMessage),
+      FixedPcdGetSize (PcdEarlyHelloMessage) - 1);
+  }
+
   CreatePpiList (&PpiListSize, &PpiList);
 
   // Enable the GIC Distributor
diff --git a/ArmPlatformPkg/PrePeiCore/MainUniCore.c b/ArmPlatformPkg/PrePeiCore/MainUniCore.c
index 1c2580eb92..2a7580dbb4 100644
--- a/ArmPlatformPkg/PrePeiCore/MainUniCore.c
+++ b/ArmPlatformPkg/PrePeiCore/MainUniCore.c
@@ -29,6 +29,11 @@ PrimaryMain (
   UINTN                   TemporaryRamBase;
   UINTN                   TemporaryRamSize;
 
+  if (FixedPcdGetSize (PcdEarlyHelloMessage) > 1) {
+    SerialPortWrite (FixedPcdGetPtr (PcdEarlyHelloMessage),
+      FixedPcdGetSize (PcdEarlyHelloMessage) - 1);
+  }
+
   CreatePpiList (&PpiListSize, &PpiList);
 
   // Adjust the Temporary Ram as the new Ppi List (Common + Platform Ppi Lists) is created at
diff --git a/ArmPlatformPkg/PrePeiCore/PrePeiCore.h b/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
index 0345dd7bdd..ae8302becd 100644
--- a/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
+++ b/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
@@ -16,6 +16,7 @@
 #include <Library/DebugLib.h>
 #include <Library/IoLib.h>
 #include <Library/PcdLib.h>
+#include <Library/SerialPortLib.h>
 
 #include <PiPei.h>
 #include <Ppi/TemporaryRamSupport.h>
diff --git a/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf b/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf
index a5b4722459..ea7b220bc8 100644
--- a/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf
+++ b/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf
@@ -66,6 +66,8 @@
   gArmPlatformTokenSpaceGuid.PcdCPUCorePrimaryStackSize
   gArmPlatformTokenSpaceGuid.PcdCPUCoreSecondaryStackSize
 
+  gArmPlatformTokenSpaceGuid.PcdEarlyHelloMessage
+
   gArmTokenSpaceGuid.PcdGicDistributorBase
   gArmTokenSpaceGuid.PcdGicInterruptInterfaceBase
   gArmTokenSpaceGuid.PcdGicSgiIntId
diff --git a/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf b/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf
index 466a2b01c3..29fb8737cb 100644
--- a/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf
+++ b/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf
@@ -64,4 +64,6 @@
   gArmPlatformTokenSpaceGuid.PcdCPUCorePrimaryStackSize
   gArmPlatformTokenSpaceGuid.PcdCPUCoreSecondaryStackSize
 
+  gArmPlatformTokenSpaceGuid.PcdEarlyHelloMessage
+
   gEfiMdeModulePkgTokenSpaceGuid.PcdInitValueInTempStack
-- 
2.31.1