[PATCH v5 08/15] ArmVirtPkg: GUID Hob for 16550 UART base address

["Sami Mujawar" <sami.mujawar@arm.com>]

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>
---

Notes:
    v5:
     - No code changes, resending patch with v5 series.           [Sami]
       Ref: https://edk2.groups.io/g/devel/message/62149
    
    v4:
      - No code change, resending patch with v4 series.           [Sami]
        Ref: https://edk2.groups.io/g/devel/message/61720

 ArmVirtPkg/ArmVirtPkg.dec                           |  2 ++
 ArmVirtPkg/Include/Guid/Early16550UartBaseAddress.h | 22 ++++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/ArmVirtPkg/ArmVirtPkg.dec b/ArmVirtPkg/ArmVirtPkg.dec
index 08ddd68a863eb82778fa7a92b20ac1bff271f5e5..bf82f7f1f3f2a0ce545d87fa93350f56de78328b 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 @@ [LibraryClasses]
 [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 0000000000000000000000000000000000000000..6b76f37a27dac03d6749f31a03e8026023231056
--- /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__
-- 
'Guid(CE165669-3EF3-493F-B85D-6190EE5B9759)'