ArmVirtPkg/Library/XenVirtMemInfoLib/XenVirtMemInfoLib.c

   1 /** @file
   2
   3   Copyright (c) 2014-2017, Linaro Limited. All rights reserved.
   4
   5   This program and the accompanying materials are licensed and made available
   6   under the terms and conditions of the BSD License which accompanies this
   7   distribution.  The full text of the license may be found at
   8   http://opensource.org/licenses/bsd-license.php
   9
  10   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include <Base.h>
  16 #include <Library/ArmLib.h>
  17 #include <Library/BaseLib.h>
  18 #include <Library/DebugLib.h>
  19
  20 STATIC ARM_MEMORY_REGION_DESCRIPTOR  mVirtualMemoryTable[2];
  21
  22 /**
  23   Return the Virtual Memory Map of your platform
  24
  25   This Virtual Memory Map is used by MemoryInitPei Module to initialize the MMU
  26   on your platform.
  27
  28   @param[out]   VirtualMemoryMap    Array of ARM_MEMORY_REGION_DESCRIPTOR
  29                                     describing a Physical-to-Virtual Memory
  30                                     mapping. This array must be ended by a
  31                                     zero-filled entry. The allocated memory
  32                                     will not be freed.
  33
  34 **/
  35 VOID
  36 EFIAPI
  37 ArmVirtGetMemoryMap (
  38   OUT ARM_MEMORY_REGION_DESCRIPTOR   **VirtualMemoryMap
  39   )
  40 {
  41   EFI_PHYSICAL_ADDRESS TopOfAddressSpace;
  42
  43   ASSERT (VirtualMemoryMap != NULL);
  44
  45   TopOfAddressSpace = LShiftU64 (1ULL, ArmGetPhysicalAddressBits ());
  46
  47   //
  48   // Map the entire physical memory space as cached. The only device
  49   // we care about is the GIC, which will be stage 2 mapped as a device
  50   // by the hypervisor, overriding the cached mapping we install here.
  51   //
  52   mVirtualMemoryTable[0].PhysicalBase = 0x0;
  53   mVirtualMemoryTable[0].VirtualBase  = 0x0;
  54   mVirtualMemoryTable[0].Length       = TopOfAddressSpace;
  55   mVirtualMemoryTable[0].Attributes   = ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK;
  56
  57   mVirtualMemoryTable[1].PhysicalBase = 0x0;
  58   mVirtualMemoryTable[1].VirtualBase  = 0x0;
  59   mVirtualMemoryTable[1].Length       = 0x0;
  60   mVirtualMemoryTable[1].Attributes   = 0x0;
  61
  62   *VirtualMemoryMap = mVirtualMemoryTable;
  63 }