ArmVirtPkg/ArmVirtQemu: add ArmVirtMemInfoLib implementation

Create a new ArmVirtMemInfoLib for ArmVirtQemuKernel by cloning the
existing ArmPlatformGetVirtualMemoryMap () for this platform,
(ArmQemuRelocatablePlatformLib *not* ArmVirtPlatformLib), and cleaning
it up:
- remove support for uncached DRAM mappings
- replace EFI_D_xxx with DEBUG_xxx throughout
- use a temp variable to hold the top of the physical address space
- use AllocatePool () instead of AllocatePages (), given that we use
  160 bytes only, and the memory is never freed.

In a future patch, we will add this library to the ordinary ArmVirtQemu
platform as well.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>

ArmVirtPkg/Library/QemuVirtMemInfoLib/QemuVirtMemInfoLib.c

@@ -0,0 +1,100 @@
+/** @file
+
+  Copyright (c) 2014-2017, Linaro Limited. All rights reserved.
+
+  This program and the accompanying materials are licensed and made available
+  under the terms and conditions of the BSD License which accompanies this
+  distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include <Base.h>
+#include <Library/ArmLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+#include <Library/MemoryAllocationLib.h>
+
+// Number of Virtual Memory Map Descriptors
+#define MAX_VIRTUAL_MEMORY_MAP_DESCRIPTORS          5
+
+EFI_PHYSICAL_ADDRESS
+ArmGetPhysAddrTop (
+  VOID
+  );
+
+/**
+  Return the Virtual Memory Map of your platform
+
+  This Virtual Memory Map is used by MemoryInitPei Module to initialize the MMU
+  on your platform.
+
+  @param[out]   VirtualMemoryMap    Array of ARM_MEMORY_REGION_DESCRIPTOR
+                                    describing a Physical-to-Virtual Memory
+                                    mapping. This array must be ended by a
+                                    zero-filled entry. The allocated memory
+                                    will not be freed.
+
+**/
+VOID
+ArmVirtGetMemoryMap (
+  OUT ARM_MEMORY_REGION_DESCRIPTOR   **VirtualMemoryMap
+  )
+{
+  ARM_MEMORY_REGION_DESCRIPTOR  *VirtualMemoryTable;
+  UINT64                        TopOfMemory;
+
+  ASSERT (VirtualMemoryMap != NULL);
+
+  VirtualMemoryTable = AllocatePool (sizeof (ARM_MEMORY_REGION_DESCRIPTOR) *
+                                     MAX_VIRTUAL_MEMORY_MAP_DESCRIPTORS);
+
+  if (VirtualMemoryTable == NULL) {
+    DEBUG ((DEBUG_ERROR, "%a: Error: Failed AllocatePool()\n", __FUNCTION__));
+    return;
+  }
+
+  // System DRAM
+  VirtualMemoryTable[0].PhysicalBase = PcdGet64 (PcdSystemMemoryBase);
+  VirtualMemoryTable[0].VirtualBase  = VirtualMemoryTable[0].PhysicalBase;
+  VirtualMemoryTable[0].Length       = PcdGet64 (PcdSystemMemorySize);
+  VirtualMemoryTable[0].Attributes   = ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK;
+
+  DEBUG ((DEBUG_INFO, "%a: Dumping System DRAM Memory Map:\n"
+      "\tPhysicalBase: 0x%lX\n"
+      "\tVirtualBase: 0x%lX\n"
+      "\tLength: 0x%lX\n",
+      __FUNCTION__,
+      VirtualMemoryTable[0].PhysicalBase,
+      VirtualMemoryTable[0].VirtualBase,
+      VirtualMemoryTable[0].Length));
+
+  // Peripheral space before DRAM
+  VirtualMemoryTable[1].PhysicalBase = 0x0;
+  VirtualMemoryTable[1].VirtualBase  = 0x0;
+  VirtualMemoryTable[1].Length       = VirtualMemoryTable[0].PhysicalBase;
+  VirtualMemoryTable[1].Attributes   = ARM_MEMORY_REGION_ATTRIBUTE_DEVICE;
+
+  // Peripheral space after DRAM
+  TopOfMemory = MIN (1ULL << FixedPcdGet8 (PcdPrePiCpuMemorySize),
+                     ArmGetPhysAddrTop ());
+  VirtualMemoryTable[2].PhysicalBase = VirtualMemoryTable[0].Length + VirtualMemoryTable[1].Length;
+  VirtualMemoryTable[2].VirtualBase  = VirtualMemoryTable[2].PhysicalBase;
+  VirtualMemoryTable[2].Length       = TopOfMemory -
+                                       VirtualMemoryTable[2].PhysicalBase;
+  VirtualMemoryTable[2].Attributes   = ARM_MEMORY_REGION_ATTRIBUTE_DEVICE;
+
+  // Remap the FD region as normal executable memory
+  VirtualMemoryTable[3].PhysicalBase = PcdGet64 (PcdFdBaseAddress);
+  VirtualMemoryTable[3].VirtualBase  = VirtualMemoryTable[3].PhysicalBase;
+  VirtualMemoryTable[3].Length       = FixedPcdGet32 (PcdFdSize);
+  VirtualMemoryTable[3].Attributes   = ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK;
+
+  // End of Table
+  ZeroMem (&VirtualMemoryTable[4], sizeof (ARM_MEMORY_REGION_DESCRIPTOR));
+
+  *VirtualMemoryMap = VirtualMemoryTable;
+}