From d30886d24c1c7e916015cbf0ec5a88498f686e28 Mon Sep 17 00:00:00 2001
From: Sami Mujawar <sami.mujawar@arm.com>
Date: Fri, 2 Oct 2020 22:14:02 +0100
Subject: [PATCH] ArmVirtPkg: GUID Hob for 16550 UART base address

Introduce a new GUID Hob gEarly16550UartBaseAddressGuid
to cache the base address of the 16550 UART, for when
PCD access is not available.

Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
Reviewed-by: Ard Biesheuvel <Ard.Biesheuvel@arm.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
---
 ArmVirtPkg/ArmVirtPkg.dec                     |  2 ++
 .../Include/Guid/Early16550UartBaseAddress.h  | 22 +++++++++++++++++++
 2 files changed, 24 insertions(+)
 create mode 100644 ArmVirtPkg/Include/Guid/Early16550UartBaseAddress.h

diff --git a/ArmVirtPkg/ArmVirtPkg.dec b/ArmVirtPkg/ArmVirtPkg.dec
index 08ddd68a86..bf82f7f1f3 100644
--- a/ArmVirtPkg/ArmVirtPkg.dec
+++ b/ArmVirtPkg/ArmVirtPkg.dec
@@ -1,6 +1,7 @@
 #/** @file
 #
 #  Copyright (c) 2014, Linaro Limited. All rights reserved.
+#  Copyright (c) 2020, ARM Limited. All rights reserved.
 #
 #  SPDX-License-Identifier: BSD-2-Clause-Patent
 #
@@ -30,6 +31,7 @@
 [Guids.common]
   gArmVirtTokenSpaceGuid = { 0x0B6F5CA7, 0x4F53, 0x445A, { 0xB7, 0x6E, 0x2E, 0x36, 0x5B, 0x80, 0x63, 0x66 } }
   gEarlyPL011BaseAddressGuid       = { 0xB199DEA9, 0xFD5C, 0x4A84, { 0x80, 0x82, 0x2F, 0x41, 0x70, 0x78, 0x03, 0x05 } }
+  gEarly16550UartBaseAddressGuid   = { 0xea67ca3e, 0x1f54, 0x436b, { 0x97, 0x88, 0xd4, 0xeb, 0x29, 0xc3, 0x42, 0x67 } }
 
   gArmVirtVariableGuid   = { 0x50bea1e5, 0xa2c5, 0x46e9, { 0x9b, 0x3a, 0x59, 0x59, 0x65, 0x16, 0xb0, 0x0a } }
 
diff --git a/ArmVirtPkg/Include/Guid/Early16550UartBaseAddress.h b/ArmVirtPkg/Include/Guid/Early16550UartBaseAddress.h
new file mode 100644
index 0000000000..6b76f37a27
--- /dev/null
+++ b/ArmVirtPkg/Include/Guid/Early16550UartBaseAddress.h
@@ -0,0 +1,22 @@
+/** @file
+  GUID for the HOB that caches the base address of the 16550 serial port, for
+  when PCD access is not available.
+
+  Copyright (c) 2020, ARM Limited. All rights reserved.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef EARLY_16550_UART_BASE_ADDRESS_H__
+#define EARLY_16550_UART_BASE_ADDRESS_H__
+
+#define EARLY_16550_UART_BASE_ADDRESS_GUID {       \
+  0xea67ca3e, 0x1f54, 0x436b, {                    \
+    0x97, 0x88, 0xd4, 0xeb, 0x29, 0xc3, 0x42, 0x67 \
+    }                                              \
+  }
+
+extern EFI_GUID gEarly16550UartBaseAddressGuid;
+
+#endif // EARLY_16550_UART_BASE_ADDRESS_H__