StandaloneMmPkg: build for 32bit arm machines

This change allows to build StandaloneMmPkg components for 32bit Arm
StandaloneMm firmware.

This change mainly moves AArch64/ source files to Arm/ side directory
for several components:  StandaloneMmCpu, StandaloneMmCoreEntryPoint
and StandaloneMmMemLib. The source file is built for both 32b and 64b
Arm targets.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>

StandaloneMmPkg/Library/StandaloneMmMemLib/ArmStandaloneMmMemLibInternal.c

@@ -0,0 +1,77 @@
+/** @file
+  Internal ARCH Specific file of MM memory check library.
+
+  MM memory check library implementation. This library consumes MM_ACCESS_PROTOCOL
+  to get MMRAM information. In order to use this library instance, the platform should produce
+  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) 2016 - 2018, ARM Limited. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+//
+// Maximum support address used to check input buffer
+//
+extern EFI_PHYSICAL_ADDRESS  mMmMemLibInternalMaximumSupportAddress;
+
+#ifdef MDE_CPU_AARCH64
+#define ARM_PHYSICAL_ADDRESS_BITS 36
+#endif
+#ifdef MDE_CPU_ARM
+#define ARM_PHYSICAL_ADDRESS_BITS 32
+#endif
+
+/**
+  Calculate and save the maximum support address.
+
+**/
+VOID
+MmMemLibInternalCalculateMaximumSupportAddress (
+  VOID
+  )
+{
+  UINT8        PhysicalAddressBits;
+
+  PhysicalAddressBits = ARM_PHYSICAL_ADDRESS_BITS;
+
+  //
+  // Save the maximum support address in one global variable
+  //
+  mMmMemLibInternalMaximumSupportAddress = (EFI_PHYSICAL_ADDRESS)(UINTN)(LShiftU64 (1, PhysicalAddressBits) - 1);
+  DEBUG ((DEBUG_INFO, "mMmMemLibInternalMaximumSupportAddress = 0x%lx\n", mMmMemLibInternalMaximumSupportAddress));
+}
+
+/**
+  Initialize cached Mmram Ranges from HOB.
+
+  @retval EFI_UNSUPPORTED   The routine is unable to extract MMRAM information.
+  @retval EFI_SUCCESS       MmRanges are populated successfully.
+
+**/
+EFI_STATUS
+MmMemLibInternalPopulateMmramRanges (
+  VOID
+  )
+{
+  // Not implemented for AARCH64.
+  return EFI_SUCCESS;
+}
+
+/**
+  Deinitialize cached Mmram Ranges.
+
+**/
+VOID
+MmMemLibInternalFreeMmramRanges (
+  VOID
+  )
+{
+  // Not implemented for AARCH64.
+}
+