[PATCH v2] StandaloneMmPkg/StandaloneMmMemLib: Update AARCH64 address size

[PATCH v2] StandaloneMmPkg/StandaloneMmMemLib: Update AARCH64 address size

[Milosek, Damian]

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Enable StandaloneMmMemLib to use longer physical addresses than 36 bits.
According to ARM "Learn the architecture - AArch64 memory management"
since Armv8.2-A physical address size was extended to 52 bits.
https://developer.arm.com/documentation/101811/0102/Address-spaces
Extending only to 48 bits to avoid page table entry layout issues.

Signed-off-by: Damian Milosek <damian.milosek@intel.com>
---
.../StandaloneMmMemLib/ArmStandaloneMmMemLibInternal.c        | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/StandaloneMmPkg/Library/StandaloneMmMemLib/ArmStandaloneMmMemLibInternal.c b/StandaloneMmPkg/Library/StandaloneMmMemLib/ArmStandaloneMmMemLibInternal.c
index 297cfae916..25ad993cdb 100644
--- a/StandaloneMmPkg/Library/StandaloneMmMemLib/ArmStandaloneMmMemLibInternal.c
+++ b/StandaloneMmPkg/Library/StandaloneMmMemLib/ArmStandaloneMmMemLibInternal.c
@@ -6,7 +6,7 @@
   all MMRAM range via MM_ACCESS_PROTOCOL, including the range for firmware (like MM Core
   and MM driver) and/or specific dedicated hardware.
-  Copyright (c) 2015, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2015 - 2023, Intel Corporation. All rights reserved.<BR>
   Copyright (c) 2016 - 2018, ARM Limited. All rights reserved.<BR>
   SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -21,7 +21,7 @@
extern EFI_PHYSICAL_ADDRESS  mMmMemLibInternalMaximumSupportAddress;
 #ifdef MDE_CPU_AARCH64
-#define ARM_PHYSICAL_ADDRESS_BITS  36
+#define ARM_PHYSICAL_ADDRESS_BITS  48
#endif
#ifdef MDE_CPU_ARM
#define ARM_PHYSICAL_ADDRESS_BITS  32
--
2.37.2.windows.2
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