ArmVirtPkg/Library/XenVirtMemInfoLib/XenVirtMemInfoLib.c

   1 /** @file
   2
   3   Copyright (c) 2014-2017, Linaro Limited. All rights reserved.
   4
   5   SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include <Base.h>
  10 #include <Library/ArmLib.h>
  11 #include <Library/BaseLib.h>
  12 #include <Library/DebugLib.h>
  13
  14 STATIC ARM_MEMORY_REGION_DESCRIPTOR  mVirtualMemoryTable[2];
  15
  16 /**
  17   Return the Virtual Memory Map of your platform
  18
  19   This Virtual Memory Map is used by MemoryInitPei Module to initialize the MMU
  20   on your platform.
  21
  22   @param[out]   VirtualMemoryMap    Array of ARM_MEMORY_REGION_DESCRIPTOR
  23                                     describing a Physical-to-Virtual Memory
  24                                     mapping. This array must be ended by a
  25                                     zero-filled entry. The allocated memory
  26                                     will not be freed.
  27
  28 **/
  29 VOID
  30 EFIAPI
  31 ArmVirtGetMemoryMap (
  32   OUT ARM_MEMORY_REGION_DESCRIPTOR   **VirtualMemoryMap
  33   )
  34 {
  35   EFI_PHYSICAL_ADDRESS TopOfAddressSpace;
  36
  37   ASSERT (VirtualMemoryMap != NULL);
  38
  39   TopOfAddressSpace = LShiftU64 (1ULL, ArmGetPhysicalAddressBits ());
  40
  41   //
  42   // Map the entire physical memory space as cached. The only device
  43   // we care about is the GIC, which will be stage 2 mapped as a device
  44   // by the hypervisor, overriding the cached mapping we install here.
  45   //
  46   mVirtualMemoryTable[0].PhysicalBase = 0x0;
  47   mVirtualMemoryTable[0].VirtualBase  = 0x0;
  48   mVirtualMemoryTable[0].Length       = TopOfAddressSpace;
  49   mVirtualMemoryTable[0].Attributes   = ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK;
  50
  51   mVirtualMemoryTable[1].PhysicalBase = 0x0;
  52   mVirtualMemoryTable[1].VirtualBase  = 0x0;
  53   mVirtualMemoryTable[1].Length       = 0x0;
  54   mVirtualMemoryTable[1].Attributes   = 0x0;
  55
  56   *VirtualMemoryMap = mVirtualMemoryTable;
  57 }