3 Copyright (c) 2009, Hewlett-Packard Company. All rights reserved.<BR>
4 Portions copyright (c) 2010, Apple Inc. All rights reserved.<BR>
5 Portions copyright (c) 2011-2013, ARM Ltd. All rights reserved.<BR>
7 This program and the accompanying materials
8 are licensed and made available under the terms and conditions of the BSD License
9 which accompanies this distribution. The full text of the license may be found at
10 http://opensource.org/licenses/bsd-license.php
12 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
13 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
18 #include <Library/MemoryAllocationLib.h>
21 #define TT_ATTR_INDX_INVALID ((UINT32)~0)
25 GetFirstPageAttribute (
26 IN UINT64
*FirstLevelTableAddress
,
32 // Get the first entry of the table
33 FirstEntry
= *FirstLevelTableAddress
;
35 if ((FirstEntry
& TT_TYPE_MASK
) == TT_TYPE_TABLE_ENTRY
) {
36 // Only valid for Levels 0, 1 and 2
37 ASSERT (TableLevel
< 3);
39 // Get the attribute of the subsequent table
40 return GetFirstPageAttribute ((UINT64
*)(FirstEntry
& TT_ADDRESS_MASK_DESCRIPTION_TABLE
), TableLevel
+ 1);
41 } else if (((FirstEntry
& TT_TYPE_MASK
) == TT_TYPE_BLOCK_ENTRY
) ||
42 ((TableLevel
== 3) && ((FirstEntry
& TT_TYPE_MASK
) == TT_TYPE_BLOCK_ENTRY_LEVEL3
)))
44 return FirstEntry
& TT_ATTR_INDX_MASK
;
46 return TT_ATTR_INDX_INVALID
;
52 GetNextEntryAttribute (
53 IN UINT64
*TableAddress
,
56 IN UINT64 BaseAddress
,
57 IN OUT UINT32
*PrevEntryAttribute
,
58 IN OUT UINT64
*StartGcdRegion
63 UINT32 EntryAttribute
;
66 UINTN NumberOfDescriptors
;
67 EFI_GCD_MEMORY_SPACE_DESCRIPTOR
*MemorySpaceMap
;
69 // Get the memory space map from GCD
70 MemorySpaceMap
= NULL
;
71 Status
= gDS
->GetMemorySpaceMap (&NumberOfDescriptors
, &MemorySpaceMap
);
72 ASSERT_EFI_ERROR (Status
);
74 // We cannot get more than 3-level page table
75 ASSERT (TableLevel
<= 3);
77 // While the top level table might not contain TT_ENTRY_COUNT entries;
78 // the subsequent ones should be filled up
79 for (Index
= 0; Index
< EntryCount
; Index
++) {
80 Entry
= TableAddress
[Index
];
81 EntryType
= Entry
& TT_TYPE_MASK
;
82 EntryAttribute
= Entry
& TT_ATTR_INDX_MASK
;
84 // If Entry is a Table Descriptor type entry then go through the sub-level table
85 if ((EntryType
== TT_TYPE_BLOCK_ENTRY
) ||
86 ((TableLevel
== 3) && (EntryType
== TT_TYPE_BLOCK_ENTRY_LEVEL3
))) {
87 if ((*PrevEntryAttribute
== TT_ATTR_INDX_INVALID
) || (EntryAttribute
!= *PrevEntryAttribute
)) {
88 if (*PrevEntryAttribute
!= TT_ATTR_INDX_INVALID
) {
89 // Update GCD with the last region
90 SetGcdMemorySpaceAttributes (MemorySpaceMap
, NumberOfDescriptors
,
92 (BaseAddress
+ (Index
* TT_ADDRESS_AT_LEVEL(TableLevel
))) - *StartGcdRegion
,
93 PageAttributeToGcdAttribute (EntryAttribute
));
96 // Start of the new region
97 *StartGcdRegion
= BaseAddress
+ (Index
* TT_ADDRESS_AT_LEVEL(TableLevel
));
98 *PrevEntryAttribute
= EntryAttribute
;
102 } else if (EntryType
== TT_TYPE_TABLE_ENTRY
) {
103 // Table Entry type is only valid for Level 0, 1, 2
104 ASSERT (TableLevel
< 3);
106 // Increase the level number and scan the sub-level table
107 GetNextEntryAttribute ((UINT64
*)(Entry
& TT_ADDRESS_MASK_DESCRIPTION_TABLE
),
108 TT_ENTRY_COUNT
, TableLevel
+ 1,
109 (BaseAddress
+ (Index
* TT_ADDRESS_AT_LEVEL(TableLevel
))),
110 PrevEntryAttribute
, StartGcdRegion
);
112 if (*PrevEntryAttribute
!= TT_ATTR_INDX_INVALID
) {
113 // Update GCD with the last region
114 SetGcdMemorySpaceAttributes (MemorySpaceMap
, NumberOfDescriptors
,
116 (BaseAddress
+ (Index
* TT_ADDRESS_AT_LEVEL(TableLevel
))) - *StartGcdRegion
,
117 PageAttributeToGcdAttribute (*PrevEntryAttribute
));
119 // Start of the new region
120 *StartGcdRegion
= BaseAddress
+ (Index
* TT_ADDRESS_AT_LEVEL(TableLevel
));
121 *PrevEntryAttribute
= TT_ATTR_INDX_INVALID
;
126 FreePool (MemorySpaceMap
);
128 return BaseAddress
+ (EntryCount
* TT_ADDRESS_AT_LEVEL(TableLevel
));
133 IN EFI_CPU_ARCH_PROTOCOL
*CpuProtocol
137 UINT32 PageAttribute
= 0;
138 UINT64
*FirstLevelTableAddress
;
141 UINTN NumberOfDescriptors
;
142 EFI_GCD_MEMORY_SPACE_DESCRIPTOR
*MemorySpaceMap
;
145 UINT64 BaseAddressGcdRegion
;
146 UINT64 EndAddressGcdRegion
;
148 // This code assumes MMU is enabled and filed with section translations
149 ASSERT (ArmMmuEnabled ());
152 // Get the memory space map from GCD
154 MemorySpaceMap
= NULL
;
155 Status
= gDS
->GetMemorySpaceMap (&NumberOfDescriptors
, &MemorySpaceMap
);
156 ASSERT_EFI_ERROR (Status
);
158 // The GCD implementation maintains its own copy of the state of memory space attributes. GCD needs
159 // to know what the initial memory space attributes are. The CPU Arch. Protocol does not provide a
160 // GetMemoryAttributes function for GCD to get this so we must resort to calling GCD (as if we were
161 // a client) to update its copy of the attributes. This is bad architecture and should be replaced
162 // with a way for GCD to query the CPU Arch. driver of the existing memory space attributes instead.
164 // Obtain page table base
165 FirstLevelTableAddress
= (UINT64
*)(ArmGetTTBR0BaseAddress ());
167 // Get Translation Control Register value
169 // Get Address Region Size
170 T0SZ
= Tcr
& TCR_T0SZ_MASK
;
172 // Get the level of the first table for the indicated Address Region Size
173 GetRootTranslationTableInfo (T0SZ
, &TableLevel
, &TableCount
);
175 // First Attribute of the Page Tables
176 PageAttribute
= GetFirstPageAttribute (FirstLevelTableAddress
, TableLevel
);
178 // We scan from the start of the memory map (ie: at the address 0x0)
179 BaseAddressGcdRegion
= 0x0;
180 EndAddressGcdRegion
= GetNextEntryAttribute (FirstLevelTableAddress
,
181 TableCount
, TableLevel
,
182 BaseAddressGcdRegion
,
183 &PageAttribute
, &BaseAddressGcdRegion
);
185 // Update GCD with the last region if valid
186 if (PageAttribute
!= TT_ATTR_INDX_INVALID
) {
187 SetGcdMemorySpaceAttributes (MemorySpaceMap
, NumberOfDescriptors
,
188 BaseAddressGcdRegion
,
189 EndAddressGcdRegion
- BaseAddressGcdRegion
,
190 PageAttributeToGcdAttribute (PageAttribute
));
193 FreePool (MemorySpaceMap
);