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 <ArmPlatform.h>
22 
23 // Number of Virtual Memory Map Descriptors
24 #define MAX_VIRTUAL_MEMORY_MAP_DESCRIPTORS          2
25 
26 // DDR attributes
27 #define DDR_ATTRIBUTES_CACHED    ARM_MEMORY_REGION_ATTRIBUTE_WRITE_BACK
28 #define DDR_ATTRIBUTES_UNCACHED  ARM_MEMORY_REGION_ATTRIBUTE_UNCACHED_UNBUFFERED
29 
30 EFI_PHYSICAL_ADDRESS
31 ArmGetPhysAddrTop (
32   VOID
33   );
34 
35 /**
36   Return the Virtual Memory Map of your platform
37 
38   This Virtual Memory Map is used by MemoryInitPei Module to initialize the MMU
39   on your platform.
40 
41   @param[out]   VirtualMemoryMap    Array of ARM_MEMORY_REGION_DESCRIPTOR
42                                     describing a Physical-to-Virtual Memory
43                                     mapping. This array must be ended by a
44                                     zero-filled entry
45 
46 **/
47 VOID
ArmPlatformGetVirtualMemoryMap(IN ARM_MEMORY_REGION_DESCRIPTOR ** VirtualMemoryMap)48 ArmPlatformGetVirtualMemoryMap (
49   IN ARM_MEMORY_REGION_DESCRIPTOR** VirtualMemoryMap
50   )
51 {
52   ARM_MEMORY_REGION_DESCRIPTOR  *VirtualMemoryTable;
53 
54   ASSERT (VirtualMemoryMap != NULL);
55 
56   VirtualMemoryTable = AllocatePages (
57                          EFI_SIZE_TO_PAGES (
58                            sizeof (ARM_MEMORY_REGION_DESCRIPTOR)
59                            * MAX_VIRTUAL_MEMORY_MAP_DESCRIPTORS
60                            )
61                          );
62 
63   if (VirtualMemoryTable == NULL) {
64     DEBUG ((EFI_D_ERROR, "%a: Error: Failed AllocatePages()\n", __FUNCTION__));
65     return;
66   }
67 
68   //
69   // Map the entire physical memory space as cached. The only device
70   // we care about is the GIC, which will be stage 2 mapped as a device
71   // by the hypervisor, which will override the cached mapping we install
72   // here.
73   //
74   VirtualMemoryTable[0].PhysicalBase = 0x0;
75   VirtualMemoryTable[0].VirtualBase  = 0x0;
76   VirtualMemoryTable[0].Length       = ArmGetPhysAddrTop ();
77   VirtualMemoryTable[0].Attributes   = DDR_ATTRIBUTES_CACHED;
78 
79   // End of Table
80   ZeroMem (&VirtualMemoryTable[1], sizeof (ARM_MEMORY_REGION_DESCRIPTOR));
81 
82   *VirtualMemoryMap = VirtualMemoryTable;
83 }
84