From bb71490fdda3b38fa9f071d281b863f9b64363bf 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-8.0/20180508-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)
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
 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 dc47adbaff..cbd72232c7 100644
--- a/ArmPlatformPkg/PrePeiCore/MainMPCore.c
+++ b/ArmPlatformPkg/PrePeiCore/MainMPCore.c
@@ -117,6 +117,11 @@ 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 134a469427..af39fc017c 100644
--- a/ArmPlatformPkg/PrePeiCore/MainUniCore.c
+++ b/ArmPlatformPkg/PrePeiCore/MainUniCore.c
@@ -35,6 +35,11 @@ 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 160894620c..bf843d7768 100644
--- a/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
+++ b/ArmPlatformPkg/PrePeiCore/PrePeiCore.h
@@ -21,6 +21,7 @@
 #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 e3a31fa7c6..1bc0c45420 100644
--- a/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf
+++ b/ArmPlatformPkg/PrePeiCore/PrePeiCoreMPCore.inf
@@ -72,6 +72,8 @@
   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 ec83cec2d8..b100820491 100644
--- a/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf
+++ b/ArmPlatformPkg/PrePeiCore/PrePeiCoreUniCore.inf
@@ -70,4 +70,6 @@
   gArmPlatformTokenSpaceGuid.PcdCPUCorePrimaryStackSize
   gArmPlatformTokenSpaceGuid.PcdCPUCoreSecondaryStackSize
 
+  gArmPlatformTokenSpaceGuid.PcdEarlyHelloMessage
+
   gEfiMdeModulePkgTokenSpaceGuid.PcdInitValueInTempStack
-- 
2.18.1