ArmVirtPkg/Library/ArmVirtPlatformLib/VirtMem.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 #include <Library/ArmPlatformGlobalVariableLib.h>
  22 #include <ArmPlatform.h>
  23
  24 // Number of Virtual Memory Map Descriptors
  25 #define MAX_VIRTUAL_MEMORY_MAP_DESCRIPTORS          5
  26
  27 // DDR attributes
  28 #define DDR_ATTRIBUTES_CACHED    ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK
  29 #define DDR_ATTRIBUTES_UNCACHED  ARM_MEMORY_REGION_ATTRIBUTE_UNCACHED_UNBUFFERED
  30
  31 EFI_PHYSICAL_ADDRESS
  32 ArmGetPhysAddrTop (
  33   VOID
  34   );
  35
  36 /**
  37   Return the Virtual Memory Map of your platform
  38
  39   This Virtual Memory Map is used by MemoryInitPei Module to initialize the MMU
  40   on your platform.
  41
  42   @param[out]   VirtualMemoryMap    Array of ARM_MEMORY_REGION_DESCRIPTOR
  43                                     describing a Physical-to-Virtual Memory
  44                                     mapping. This array must be ended by a
  45                                     zero-filled entry
  46
  47 **/
  48 VOID
  49 ArmPlatformGetVirtualMemoryMap (
  50   IN ARM_MEMORY_REGION_DESCRIPTOR** VirtualMemoryMap
  51   )
  52 {
  53   ARM_MEMORY_REGION_ATTRIBUTES  CacheAttributes;
  54   ARM_MEMORY_REGION_DESCRIPTOR  *VirtualMemoryTable;
  55
  56   ASSERT (VirtualMemoryMap != NULL);
  57
  58   VirtualMemoryTable = AllocatePages (
  59                          EFI_SIZE_TO_PAGES (
  60                            sizeof (ARM_MEMORY_REGION_DESCRIPTOR)
  61                            * MAX_VIRTUAL_MEMORY_MAP_DESCRIPTORS
  62                            )
  63                          );
  64
  65   if (VirtualMemoryTable == NULL) {
  66     DEBUG ((EFI_D_ERROR, "%a: Error: Failed AllocatePages()\n", __FUNCTION__));
  67     return;
  68   }
  69
  70   if (FeaturePcdGet (PcdCacheEnable) == TRUE) {
  71     CacheAttributes = DDR_ATTRIBUTES_CACHED;
  72   } else {
  73     CacheAttributes = DDR_ATTRIBUTES_UNCACHED;
  74   }
  75
  76   // System DRAM
  77   VirtualMemoryTable[0].PhysicalBase = PcdGet64 (PcdSystemMemoryBase);
  78   VirtualMemoryTable[0].VirtualBase  = VirtualMemoryTable[0].PhysicalBase;
  79   VirtualMemoryTable[0].Length       = PcdGet64 (PcdSystemMemorySize);
  80   VirtualMemoryTable[0].Attributes   = CacheAttributes;
  81
  82   DEBUG ((EFI_D_INFO, "%a: Dumping System DRAM Memory Map:\n"
  83       "\tPhysicalBase: 0x%lX\n"
  84       "\tVirtualBase: 0x%lX\n"
  85       "\tLength: 0x%lX\n",
  86       __FUNCTION__,
  87       VirtualMemoryTable[0].PhysicalBase,
  88       VirtualMemoryTable[0].VirtualBase,
  89       VirtualMemoryTable[0].Length));
  90
  91   // Peripheral space before DRAM
  92   VirtualMemoryTable[1].PhysicalBase = 0x0;
  93   VirtualMemoryTable[1].VirtualBase  = 0x0;
  94   VirtualMemoryTable[1].Length       = VirtualMemoryTable[0].PhysicalBase;
  95   VirtualMemoryTable[1].Attributes   = ARM_MEMORY_REGION_ATTRIBUTE_DEVICE;
  96
  97   // Peripheral space after DRAM
  98   VirtualMemoryTable[2].PhysicalBase = VirtualMemoryTable[0].Length + VirtualMemoryTable[1].Length;
  99   VirtualMemoryTable[2].VirtualBase  = VirtualMemoryTable[2].PhysicalBase;
 100   VirtualMemoryTable[2].Length       = MIN (1ULL << FixedPcdGet8 (PcdPrePiCpuMemorySize),
 101                                          ArmGetPhysAddrTop ()) -
 102                                        VirtualMemoryTable[2].PhysicalBase;
 103   VirtualMemoryTable[2].Attributes   = ARM_MEMORY_REGION_ATTRIBUTE_DEVICE;
 104
 105   // Remap the FD region as normal executable memory
 106   VirtualMemoryTable[3].PhysicalBase = FixedPcdGet64 (PcdFdBaseAddress);
 107   VirtualMemoryTable[3].VirtualBase  = VirtualMemoryTable[3].PhysicalBase;
 108   VirtualMemoryTable[3].Length       = FixedPcdGet32 (PcdFdSize);
 109   VirtualMemoryTable[3].Attributes   = CacheAttributes;
 110
 111   // End of Table
 112   ZeroMem (&VirtualMemoryTable[4], sizeof (ARM_MEMORY_REGION_DESCRIPTOR));
 113
 114   *VirtualMemoryMap = VirtualMemoryTable;
 115 }