ArmVirtPkg/Library/ArmXenRelocatablePlatformLib/XenVirtMem.c

   1 /** @file
   2 *
   3 *  Copyright (c) 2014, Linaro Limited. All rights reserved.
   4 *
   5 *  This program and the accompanying materials
   6 *  are licensed and made available under the terms and conditions of the BSD License
   7 *  which accompanies this 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 <Library/ArmPlatformLib.h>
  16 #include <Library/DebugLib.h>
  17 #include <Library/BaseMemoryLib.h>
  18 #include <Library/PcdLib.h>
  19 #include <Library/IoLib.h>
  20 #include <Library/MemoryAllocationLib.h>
  21
  22 // Number of Virtual Memory Map Descriptors
  23 #define MAX_VIRTUAL_MEMORY_MAP_DESCRIPTORS          2
  24
  25 // DDR attributes
  26 #define DDR_ATTRIBUTES_CACHED    ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK
  27 #define DDR_ATTRIBUTES_UNCACHED  ARM_MEMORY_REGION_ATTRIBUTE_UNCACHED_UNBUFFERED
  28
  29 EFI_PHYSICAL_ADDRESS
  30 ArmGetPhysAddrTop (
  31   VOID
  32   );
  33
  34 /**
  35   Return the Virtual Memory Map of your platform
  36
  37   This Virtual Memory Map is used by MemoryInitPei Module to initialize the MMU
  38   on your platform.
  39
  40   @param[out]   VirtualMemoryMap    Array of ARM_MEMORY_REGION_DESCRIPTOR
  41                                     describing a Physical-to-Virtual Memory
  42                                     mapping. This array must be ended by a
  43                                     zero-filled entry
  44
  45 **/
  46 VOID
  47 ArmPlatformGetVirtualMemoryMap (
  48   IN ARM_MEMORY_REGION_DESCRIPTOR** VirtualMemoryMap
  49   )
  50 {
  51   ARM_MEMORY_REGION_DESCRIPTOR  *VirtualMemoryTable;
  52
  53   ASSERT (VirtualMemoryMap != NULL);
  54
  55   VirtualMemoryTable = AllocatePages (
  56                          EFI_SIZE_TO_PAGES (
  57                            sizeof (ARM_MEMORY_REGION_DESCRIPTOR)
  58                            * MAX_VIRTUAL_MEMORY_MAP_DESCRIPTORS
  59                            )
  60                          );
  61
  62   if (VirtualMemoryTable == NULL) {
  63     DEBUG ((EFI_D_ERROR, "%a: Error: Failed AllocatePages()\n", __FUNCTION__));
  64     return;
  65   }
  66
  67   //
  68   // Map the entire physical memory space as cached. The only device
  69   // we care about is the GIC, which will be stage 2 mapped as a device
  70   // by the hypervisor, which will override the cached mapping we install
  71   // here.
  72   //
  73   VirtualMemoryTable[0].PhysicalBase = 0x0;
  74   VirtualMemoryTable[0].VirtualBase  = 0x0;
  75   VirtualMemoryTable[0].Length       = ArmGetPhysAddrTop ();
  76   VirtualMemoryTable[0].Attributes   = DDR_ATTRIBUTES_CACHED;
  77
  78   // End of Table
  79   ZeroMem (&VirtualMemoryTable[1], sizeof (ARM_MEMORY_REGION_DESCRIPTOR));
  80
  81   *VirtualMemoryMap = VirtualMemoryTable;
  82 }