ArmVirtPkg/ArmVirtXen: add ArmVirtMemInfoLib implementation

Clone the existing ArmPlatformGetVirtualMemoryMap () for this platform,
clean it up slightly (by using a static buffer rather than a heap
allocation, and removing the support for uncached DRAM mappings), and
turn it into a new ArmVirtMemInfoLib implementation.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Julien Grall <julien.grall@linaro.org>

ArmVirtPkg/ArmVirtXen.dsc

@@ -44,6 +44,7 @@
   VirtioMmioDeviceLib|OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDeviceLib.inf
 
   ArmPlatformLib|ArmVirtPkg/Library/ArmXenRelocatablePlatformLib/ArmXenRelocatablePlatformLib.inf
+  ArmVirtMemInfoLib|ArmVirtPkg/Library/XenVirtMemInfoLib/XenVirtMemInfoLib.inf
 
   TimerLib|ArmPkg/Library/ArmArchTimerLib/ArmArchTimerLib.inf
 

ArmVirtPkg/Library/XenVirtMemInfoLib/AArch64/PhysAddrTop.S

@@ -0,0 +1,39 @@
+#
+#  Copyright (c) 2011-2013, ARM Limited. All rights reserved.
+#  Copyright (c) 2016-2017, 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 <AsmMacroIoLibV8.h>
+
+//EFI_PHYSICAL_ADDRESS
+//GetPhysAddrTop (
+//  VOID
+//  );
+ASM_FUNC(ArmGetPhysAddrTop)
+  mrs   x0, id_aa64mmfr0_el1
+  adr   x1, .LPARanges
+  and   x0, x0, #7
+  ldrb  w1, [x1, x0]
+  mov   x0, #1
+  lsl   x0, x0, x1
+  ret
+
+//
+// Bits 0..2 of the AA64MFR0_EL1 system register encode the size of the
+// physical address space support on this CPU:
+// 0 == 32 bits, 1 == 36 bits, etc etc
+// 6 and 7 are reserved
+//
+.LPARanges:
+  .byte 32, 36, 40, 42, 44, 48, -1, -1
+
+ASM_FUNCTION_REMOVE_IF_UNREFERENCED

ArmVirtPkg/Library/XenVirtMemInfoLib/Arm/PhysAddrTop.S

@@ -0,0 +1,24 @@
+#
+#  Copyright (c) 2011-2013, ARM Limited. All rights reserved.
+#  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 <AsmMacroIoLib.h>
+
+//EFI_PHYSICAL_ADDRESS
+//GetPhysAddrTop (
+//  VOID
+//  );
+ASM_FUNC(ArmGetPhysAddrTop)
+  mov   r0, #0x00000000
+  mov   r1, #0x10000
+  bx    lr

ArmVirtPkg/Library/XenVirtMemInfoLib/XenVirtMemInfoLib.c

@@ -0,0 +1,63 @@
+/** @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/DebugLib.h>
+
+STATIC ARM_MEMORY_REGION_DESCRIPTOR  mVirtualMemoryTable[2];
+
+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
+EFIAPI
+ArmVirtGetMemoryMap (
+  OUT ARM_MEMORY_REGION_DESCRIPTOR   **VirtualMemoryMap
+  )
+{
+  ASSERT (VirtualMemoryMap != NULL);
+
+  //
+  // Map the entire physical memory space as cached. The only device
+  // we care about is the GIC, which will be stage 2 mapped as a device
+  // by the hypervisor, overriding the cached mapping we install here.
+  //
+  mVirtualMemoryTable[0].PhysicalBase = 0x0;
+  mVirtualMemoryTable[0].VirtualBase  = 0x0;
+  mVirtualMemoryTable[0].Length       = ArmGetPhysAddrTop ();
+  mVirtualMemoryTable[0].Attributes   = ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK;
+
+  mVirtualMemoryTable[1].PhysicalBase = 0x0;
+  mVirtualMemoryTable[1].VirtualBase  = 0x0;
+  mVirtualMemoryTable[1].Length       = 0x0;
+  mVirtualMemoryTable[1].Attributes   = 0x0;
+
+  *VirtualMemoryMap = mVirtualMemoryTable;
+}

ArmVirtPkg/Library/XenVirtMemInfoLib/XenVirtMemInfoLib.inf

@@ -0,0 +1,41 @@
+#/* @file
+#
+#  Copyright (c) 2011-2015, ARM Limited. All rights reserved.
+#  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.
+#
+#*/
+
+[Defines]
+  INF_VERSION                    = 0x0001001A
+  BASE_NAME                      = XenVirtMemInfoLib
+  FILE_GUID                      = 40d1f8f5-4dfe-4e0f-9a15-b1de9dc9f4ed
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = ArmVirtMemInfoLib
+
+[Sources]
+  XenVirtMemInfoLib.c
+
+[Sources.ARM]
+  Arm/PhysAddrTop.S
+
+[Sources.AARCH64]
+  AArch64/PhysAddrTop.S
+
+[Packages]
+  ArmPkg/ArmPkg.dec
+  ArmVirtPkg/ArmVirtPkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  ArmLib
+  DebugLib